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RCA-GE_CTC185_Training


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CTC185
SERVICE ADJUSTMENTS                                                                                             Return to Start
Service Mode                                                     Changing Paramenters
  Most of the alignments for this chassis are software-driven;      Once the proper Security Code has been etered, the CH 
adjustments are made by modifying parameter values via the       and CH  buttons can be used to change the parameter
service menu. When parameter values are modified, the            number.
corresponding T-chip (U2001) registers, tuner (U501)
                                                                 Changing Values
registers and EEprom (U3102 and U8302) locations are
updated. Parameters are grouped as follows:                        The VOL + and VOL - buttons can be used to change the
                                                                 value of the parameter selected.
         Group 0 - Instrument/Chassis Parameters
                                                                 Changing Groups
         Group 1 - Tuner Parameters
                                                                   To select a different parameter group, press CH  or CH 
                                                                 to return to parameter "0" and enter the security code that
  A complete list of the software chassis alignment              corresponds to the desired group.
parameters is shown in Table 1.
                                                                 Setup Service Line
                                                                 The Menu button may be used to enable the vertical collapse
Entering the Service Mode                                        setup line. The button functions as a toggle. The setup line has
 1. Press and release the POWER button to turn the               the following characteristics:
    instrument on.                                                -Video source is set to ground through the grounded input pin
 2. Press and hold the MENU button.                              of the video matrix switch;
   a. Press and release the POWER button.                         -Brightness is set to 10 IRE;
   b. Press and release the VOL+ button.                          -Vertical is disabled.
 3. Release the MENU button.                                     When the setup line is toggled off, the characteristics modified
                                                                 above will return to their prior settings.
  The instrument will display the following menu:                Note: Changing to another parameter, with Channel-Up/
                                                                           Down, will toggle the Setup Service Line OFF.

                                                                 Exiting The Service Mode
                                                                   The service mode can be exited at any time by pressing the
PARAMETER
                                                     VALUE       POWER button. No additional steps are required to write new
CONTROLLED
                                               CONTROLLED        data into the EEprom(s); new data is entered as parameter
BY CHAN UP/DN
                                               BY VOL UP/DN      values are changed.
                                                                 High Voltage
  GROUP                                                            High voltage on this chassis is NOT adjustable. To check
  NUMBER         000      000000       000                       high voltage connect a VTVM with high voltage probe to the
                                                                 picture tube high voltage anode, negative lead to picture tube
                                                                 ground strap (use 500 volt scale).
                                                                 NOTE: The meter (VTVM with high voltage probe) used for
                                                                           measuring high voltage must have a resistance of
  The CH  and CH  buttons on the front panel (or the                       1000 megohm or more and be accurate within 5% or
remote transmitter) are used to change the parameter (P)                   better.
number. The VOL + and VOL - buttons are used to change the         Nominal high voltage for this chassis (at maximum beam
parameter value (V).                                             current) is 23 kV (19 inch), 24 kV (20 inch) and 25.5 kV (27
                                                                 inch) when measured with a VTVM (with high voltage probe)
                                                                 and must not exceed 26.9kV (19 inch), 27.5kV (20 inch), and
NOTE: Attempting to change the parameter number (using           27 kV (27 inch) under any circumstances.
      CH  or CH ) at this point will cause the instrument
      to exit the service mode. A valid security code must       X-Radiation Protection Shutdown Check
      be entered (using VOL + or VOL -) before selecting
      an alignment parameter.                                    NOTE: When service is required, especially in the
                                                                       horizontal deflection, high voltage, or regulated B+
                                                                       circuits the X-Radiation Protection circuit should be
Security Codes                                                         tested for proper operation as follows:
  When the service mode is first turned on, the parameter will
be "0", which does not correspond to an alignment. This is the    1. Apply 120 volts AC using a variac (variable AC)
security code parameter, the purpose of which is to prevent          transformer for accurate AC input voltage.
accidental entry into the parameter groups. The value for         2. Allow for instrument warm up and adjust user controls or
parameter "0" must be correctly set to access the two                maximum brightness and contrast levels.
parameter groups as follows:
                                                                  3. Locate the x-ray protect test stakes labeled XRP1 and
                  Group 0 - set value to 76                          XRP2(J4901 located to the rear and center of the chassis).
                  Group 1 - set value to 77                       4. Momentarily short stake XRP1 to stake XRP2. The
                                                                     instrument must shutdown and then restart.
                                                                                                                Return to Start
                                                           Page 3-1
CTC185
SERVICE ADJUSTMENTS (Continued)                                                                               Return to Start

                                                SERVICE MENU CHART


NOTE: When in the Service Menu Mode, channel up/dn will change the parameter # and volume +/- will change the value range.
      To perform a channel change, while in the service menu mode, use the digit keys on the remote transmitter to direct enter
      a channel number . To access channels 100 thru 125, press and hold the channel 1 button on the remote control until the
      number 1, and two dashes are displayed on the screen, then press the second two digits.




Parameter #         Parameter Name                             Value Range                Comment:
Chan to                                                        Vol to
Change                                                         adjust
 0 00               Pass No. for Serv. adjust                  Must set to 76             May not advance until value set
Service Adjustment Parameters
 0   01             Horiz. Phase                               00-15
 0   02             Vertical DC                                00-63
 0   03             Vertical S Correction                      00-15
 0   04             Vertical size                              00-127
 0   05             Red Bias                                   00-127                     Press Menu button for setup line
 0   06             Green Bias                                 00-127                     Press Menu button for setup line
 0   07             Blue Bias                                  00-127                     Press Menu button for setup line
 0   08             Red Drive                                  00-63
 0   09             Green Drive                                00-63
 0   10             Blue Drive                                 00-63
 0   11             Sub-Brightness                             00-127
 0   12             RF AGC                                     00-63
 0   13             FM Level                                   00-31
 0   14             VCO Tuning                                 00-127
 0   15             APC Detector Adjust                        00-63                      Defeat IF AGC
 0   16             Tint Preset                                00-127
 0   17             Color Preset                               00-127
 0   18             Video Level                                00-07
 0   19             Vertical Linearity                         00-15
 0   20             Vertical Countdown Mode                    00-03


                                        Table 1 - Chassis Alignment Parameters




                                                                                                              Return to Start
                                                          Page 3-2
CTC185
SERVICE ADJUSTMENTS (Continued)                                                                                   Return to Start
Test Equipment Required                                            4. Measure the 1kHz envelope (not the carrier waveform)
Digital Voltmeter                                                     as shown in Fig 1.
Dual Trace Oscilloscope                                            5. Adjust the FM Level value range to the step which gives
MTS Signal Generator (B&K 2009 or equivalent)                         the closest reading to 333mVp-p indication of the 1KHz
                                                                      component.
NTSC Signal Generator (B&K 1249 or equivalent)
DC Power Supply-Well regulated, variable DC bias supply
TAG001 Service Generator (stock # 215568).
NOTE: All alignment adjustments, are bus controlled. They
         are accessable only through entry of the correct code.
         See the parameter # and value range adjustment           333mVp-p
         chart in this service data. The following alignments
         must be performed in the order given.

APC Offset
Test Point:     U1001 pin 12 (AFT out)       Main PCB
Adjust:         Parameter 15                                      Fig. 1 - FM Level Alignment

 1. Enter parameter # 15 (see chart).                             RF AGC
 2. Connect a voltmeter to U1001 pin 12 (AFT out).                Test Point:      C2306+ (RF AGC)                Main PCB
 3. Short U1001 pin 11 (IF AGC) to ground.                        Adjust:          Parameter #6                   Range: 0 - 63
 4. With no signal applied, adjust the APC Offset value range
    for 3.8VDC.                                                      The RF AGC has been preset at the time of manufacture for
 5. Remove the short from the IF AGC.                             optimum operation over a wide range of RF signal input
                                                                  conditions. Readjustment should not be required unless the
                                                                  tuner has been repaired, IC 1001 has been replaced, IC3101
PLL Tuning (IF VCO Free Run)                                      has been replaced, IC3201 has been replaced, or unusual
Test Point:  U1001 pin 12 (AFT out)          Main PCB             signal conditions exist such as:
Adjust:      Parameter 14                                           a. Cable TVadjacent channel interference.
                                                                    b. Picture bending and/or channel 6 color beats which are
 1.   Enter parameter # 14 (see chart).                                usually due to excessive RF signal input. This occurs
 2.   Tune the instrument to receive a color bar signal.               when the receiver location is too close to the transmitting
                                                                       tower. It may also occur when the receiver is connected
 3.   Connect a DC voltmeter to U1001 pin 12 (AFT out).                to an antenna distribution system where the RF signal has
 4.   Adjust the PLL Tuning value range for 3.8VDC.                    been amplified. The signal should be attenuated at the
                                                                       antenna input to a more satisfactory level.
Video Level                                                         c. Picture Noise caused by broadcast noise or weak
                                                                       signal. If the broadcast is clean and the received signal
Test Point:     P 2301 pin 3 (Q2301 - E)     Main PCB
                                                                       is at least 1 mV, the picture will be noise free in any area.
Adjust:         Parameter 18

 1. Enter parameter # 18 (see chart).                             NOTE: Adjustment of the RF AGC parameters may not have
                                                                        any visible effect except under unusual conditions.
 2. Tune the instrument to receive a color bar signal.                  Ajusting the RF AGC to one extreme of its
 3. Connect a scope probe (500mV, 20usec/div.) to the                   parameter limits will usually provide a relatively
    emitter of Q2301.                                                   poor signal-to-noise ratio, while adustment to the
 4. Adjust value range to produce 1.0 volt p-p (sync to white)          other extreme of its parameter limits will cause a
                                                                        degradation of overload conditions such as channel
                                                                        6 color beats or Cable TV adjacent channel
FM Level (Wideband Audio)                                               interference. If the RF AGC parameter setting is
Test Point:  TP1201 (WBA out)                Main PCB                   adjusted, check all local channels for proper
Adjust:      Parameter 13                                               operation. Use weakest local signal to adjust RF
                                                                        AGC parameter setting.
 1. Enter parameter # 13 (see chart).
 2. Tune the instrument to receive 1kHz, L+R stereo audio          1. Disconnect RF source from the antenna connector.
    from the MTS generator (PILOT off, SAP off).                   2. Connect the sweep/marker generator to the IF input
 3. Connect a scope probe (200mV, 200usec/div.) to                    (SF2301 pin 1); use SF2301 pin 2 as ground reference.
    TP1202 (WBA output).                                              Set the generator for a 45.75MHz marker, 450mVrms.



                                                                                                                  Return to Start
                                                            Page 3-3
CTC185
SERVICE ADJUSTMENTS (Continued)                                                                                 Return to Start
NOTE: Signal level must be set accurately. Measure the             5. Connect a scope probe (50V/10usec/div.) to the red kine
      input signal level at SF2301 pin 1 with the signal              drive output (TP5003).
      connected. Signal level must be set to within `1%.           6. Adjust chassis parameter 11, Sub-Brightness, for a 30
                                                                      volt blanking reserve.
NOTE: Signal leakage around the SAW filter will be a
                                                                   7. Return the RGB drive and RGB bias parameters to their
      problem unless proper precautions are taken. The
                                                                      original values.
      leads used to connect the signal source to SF2301
      must be shielded to within 1/2" of the circuit board.

 3. Connect the DC voltmeter across C2306.
 4. Adjust RF AGC (parameter #12) to the step which gives
    a reading closest to +3.8VDC.                                 30V




Tint/Color Preset (Fig. 2)
Test Point:   TP5005                      Kine PCB
Adjust:       Parameter 16 (Tint Preset)
              Parameter 17 (Color Preset)                         Focus Adjust
                                                                    Adjust focus control to provide best overall picture focus.
 1. Tune the instrument to receive a color bar signal.
 2. Turn the Autocolor feature off.                               Fig. 3 - Sub-Brightness Adjustment
 3. Connect a scope probe (50V/10usec/div.) to the blue kine
    drive output (TP5005).
                                                                  Horizontal Phase
 4. Adjust chassis parameter 16, Tint Preset, to set the
    amplitude of the cyan bar equal to the magenta bar.           Test Point:   Observe Display
                                                                  Adjust:       Parameter 1
 5. Adjust chassis parameter 17, Color Preset, to set the
    amplitude of the blue bar equal to the white bar.
                                                                   1. Enter parameter # 01 (see chart).
 6. Repeat steps 4 and 5 until both conditions are met.
                                                                   2. Adjust value range to center picture left to right.
 7. If both conditions can not be met, set both the Tint Preset
    and Color Preset chassis parameters to value = 64.
                                                                  Vertical DC Adjust
                                                                  Test Point:  Observe Display
                                                                  Adjust:      Parameter 2

                                                                   1. Enter parameter # 02 (see chart).
                                                                   2. Adjust value range to center picture top to bottom.

                                                                  Vertical S Correction
                                                                  Adjust:       Parameter 3
                                                                  Value:        6,12
              White Cyan Magenta Blue
                                                                   1. Enter parameter # 03 (see chart).
Fig. 2 - Tint/Color Preset                                         2. Set the value range to 6 for 19/20" tubes and 12 for the 25
                                                                      and 27" tubes.

                                                                  Vertical Size
Sub-Brightness (Fig. 3)
                                                                  Test Point:   Observe Display
Test Point:     TP5003                    Kine PCB                Adjust:       Parameter 4
Adjust:         Parameter 11 (Sub-Brightness)
                                                                   1. Enter parameter # 04 (see chart).
 1. Tune the instrument to receive a color bar signal.             2. Adjust value range to provide approximately 1/4 inch
 2. Reset the Picture Controls (use the customer control              overscan at top and bottom of screen.
    menu).
 3. Write down the parameter values for the RGB drive and
    RGB bias adjustments.
 4. Set the RGB Drive parameters to value = 32, RGB Bias
    parameters to value = 5 and the Sub-Brightness
    parameter to value = 63.
                                                                                                                Return to Start
                                                            Page 3-4
CTC185
SERVICE ADJUSTMENTS (Continued)                                                                                 Return to Start
Color Temperature                                                  4. Adjust (knife) the Band 2 Oscillator coil (L7304) for
Test Point:  Q5001-C (Red Drive)       Kine PCB                       23.7VDC (`0.3VDC).
             Q5002-C (Green Drive)     Kine PCB                    5. Connect the DC voltmeter to U1001 pin 11 (IF AGC).
             Q5003-C (Blue Drive)      Kine PCB                    6. Select parameter #31 and record its present value, then
Adjust:      Parameter 5 (Red Bias)                                   adjust parameter #31 through its range (0 - 62). If a "null"
             Parameter 6 (Green Bias)                                 in the AGC voltage appears, the Band 2 Single-Tuned
             Parameter 7 (Blue Bias)                                  coil (L7110) alignment is acceptable; return parameter
             Parameter 8 (Red Drive)                                  #31 to the recorded value and proceed to the next step. If
             Parameter 9 (Green Drive)                                a "null" does not appear, adjust (knife) the Band 2 Single-
             Parameter 10 (Blue Drive)                                Tuned coil (L7304) and repeat this step.
             Screen Control
                                                                   7. Select parameter #32 and record its present value, then
                                                                      adjust parameter #32 through its range (0 - 62). If a "null"
 1. Preset customer Video controls to mid-range.                      in the AGC voltage appears, the Band 2 Secondary coil
 2. Disconnect all signal sources.                                    (L7113) alignment is acceptable; return parameter #32 to
 3. Preset red, green and blue drive parameter values to              the recorded value and proceed to the next step. If a
    mid-range (approximate setting of 32).                            "null" does not appear, adjust (knife) the Band 2
 4. Preset red, green and blue bias parameters values to 5.           Secondary coil (L7113) and repeat this step.
 5. Press the Menu button for setup line. Adjust the screen        8. Select parameter #33 and record its present value, then
    control to just produce a centerline (red, green or blue).        adjust parameter #33 through its range (0 - 62). If a "null"
                                                                      in the AGC voltage appears, the Band 2 Primary coil
NOTE: The Menu button may be used to enable the vertical              (L7111) alignment is acceptable; return parameter #33 to
    collapse setup line. The button functions to toggle the           the recorded value and proceed to the next step. If a
    line On/Off. Changing to another parameter will turn the          "null" does not appear, adjust (knife) the Band 2 Primary
    setup line OFF.                                                   coil (L7111) and repeat this step.
 6. Enter parameter #s for the remaining two bias control
    colors and adjust to produce a white setup line.
    (Reminder: Changing to another parameter will turn the        Band 1 Manual Alignment
    setup line OFF. Press the Menu button for a setup line.)      Test Points: U7401 pin 5 (Loop Fil2)          Main PCB
 7. Set brightness and contrast controls to maximum.                           U1001 PIN 11 (IF AGC)            Main PCB
                                                                  Adjust:      L7115(Band 1 Sgl)                Main PCB
 8. Tune the instrument to receive a grey scale signal.                        L7112 (Band 1 Pri)               Main PCB
 9. Enter access codes for the color drive controls (8 for red,                L7114 (Band 1 Sec)               Main PCB
    9 for green and 10 for blue) in random sequence. Adjust                    L7305 (Band 1 Osc)               Main PCB
    their respective parameters to obtain a 6500 degree
    kelvin color temperature (warm white) raster.
                                                                   1. Connect the TAG001 Service Generator as described in
10. Check the low light to high light gray scale tracking             the TAG001 user's manual.
    (black and white picture). Should any color other than
                                                                   2. Connect the DC voltmeter to U7401 pin 5 (Loop Fil2).
    gray or white be dominant in low light to high light areas
    the color temperature settings have not been properly          3. Set the service generator for Channel 17 output. Tune the
    performed. Repeat the procedure if necessary.                     instrument to receive Channel 17.
NOTE: Color bias adjustments affect the low light (dark)           4. Adjust (knife) the Band 1 Oscillator coil (L7305) for
         areas while color drive adjustments affect the high          20.0VDC (`0.3VDC).
         light (white) areas.                                      5. Reconnect the DC voltmeter to U1001 pin 11 (IF AGC).
                                                                   6. Select parameter #13 and record its present value, then
Tuner Adjustments:                                                    adjust parameter #13 through its range (0 - 62). If a "null"
Manual Alignment begins with band 2 coils then band 1 coils           in the AGC voltage appears, the Band 1 Single-Tuned
and finishes with band 3 coils.                                       coil (L7115) alignment is acceptable; return parameter
Band 2 Manual Alignment                                               #13 to the recorded value and proceed to the next step. If
                                                                      a "null" does not appear, adjust (knife) the Band 1 Single-
Test Points:    U7401 pin 5 (Loop Fil2) Main PCB                      Tuned coil (L7115) and repeat this step.
                U1001 PIN 11 (IF AGC) Main PCB
Adjust:         L7304 (Band 2 Osc)         Main PCB                7. Select parameter #14 and record its present value, then
                L7110 (Band 2 Sgl)         Main PCB                   adjust parameter #14 through its range (0 - 62). If a "null"
                L7111 (Band 2 Pri)         Main PCB                   in the AGC voltage appears, the Band 1 Secondary coil
                L7113 (Band 2 Sec)         Main PCB                   (L7114) alignment is acceptable; return parameter #14 to
                                                                      the recorded value and proceed to the next step. If a
                                                                      "null" does not appear, adjust (knife) the Band 1
 1. Connect the TAG001 Service Generator as described in              Secondary coil (L7114) and repeat this step.
    the TAG001 user's manual.
                                                                   8. Select parameter #15 and record its present value, then
 2. Connect the DC voltmeter to U7401 pin 5 (Loop Fil2).              adjust parameter #15 through its range (0 - 62). If a "null"
 3. Set the service generator for Channel 50 output. Tune the         in the AGC voltage appears, the Band 1 Primary coil
    instrument to receive Channel 50.                                 (L7112) alignment is acceptable; return parameter #15 to
                                                                                                                Return to Start
                                                            Page 3-5
CTC185
SERVICE ADJUSTMENTS (Continued)                                                                               Return to Start
    the recorded value and proceed to the next step. If a              minimum DC voltage.
    "null" does not appear, adjust (knife) the Band 1 Primary       7. Repeat steps 4 through 6. The adjustments must be
    coil (L7112) and repeat this step.                                 repeated to assure correct alignment.
                                                                    8. Change the service generator and the instrument to
Band 3 Manual Alignment                                                Channel 6. Adjust CH6 Sec/Pri/Sgl (parameter #'s 4, 5
Test Points: U7401 pin 5 (Loop Fil2)          Main PCB                 and 6) for minimum DC voltage, then repeat the
             U1001 PIN 11 (IF AGC)            Main PCB                 adjustment.
Adjust:      L7102 (Band 3 Sgl)               Main PCB              9. Change the service generator and the instrument to
             L7104 (Band 3 Pri)               Main PCB                 Channel 98. Adjust CH98 Sec/Pri/Sgl (parameter #'s 7, 8
             L7105 (Band 3 Sec)               Main PCB                 and 9) for minimum DC voltage, then repeat the
             L7303 (Band 3 Osc)               Main PCB                 adjustment.
                                                                   10. Change the service generator and the instrument to
 1. Connect the TAG001 Service Generator as described in               Channel 15. Adjust CH15 Sec/Pri/Sgl (parameter #'s 10,
    the TAG001 user's manual.                                          11 and 12) for minimum DC voltage, then repeat the
 2. Connect the DC voltmeter to U7401 pin 5 (Loop Fil2).               adjustment.
 3. Set the service generator for Channel 125 output. Tune         11. Change the service generator and the instrument to
    the instrument to receive Channel 125.                             Channel 17. Adjust CH17 Sec/Pri/Sgl (parameter #'s 13,
                                                                       14 and 15) for minimum DC voltage, then repeat the
 4. Adjust (knife) the Band 3 Oscillator coil (L7303) for              adjustment.
    23.2VDC (`0.3VDC).
                                                                   12. Change the service generator and the instrument to
 5. Reconnect the DC voltmeter to U1001 pin 11 (IF AGC).               Channel 18. Adjust CH18 Sec/Pri/Sgl (parameter #'s 16,
 6. Select parameter #55 and record its present value, then            17 and 18) for minimum DC voltage, then repeat the
    adjust parameter #55 through its range (0 - 62). If a "null"       adjustment.
    in the AGC voltage appears, the Band 3 Single-Tuned            13. Change the service generator and the instrument to
    coil (L7102) alignment is acceptable; return parameter             Channel 9. Adjust CH9 Sec/Pri/Sgl (parameter #'s 19, 20
    #55 to the recorded value and proceed to the next step. If         and 21) for minimum DC voltage, then repeat the
    a "null" does not appear, adjust (knife) the Band 3 Single-        adjustment.
    Tuned coil (L7102) and repeat this step.
                                                                   14. Change the service generator and the instrument to
 7. Select parameter #56 and record its present value, then            Channel 29. Adjust CH29 Sec/Pri/Sgl (parameter #'s 22,
    adjust parameter #56 through its range (0 - 62). If a "null"       23 and 24) for minimum DC voltage, then repeat the
    in the AGC voltage appears, the Band 3 Secondary coil              adjustment.
    (L7105) alignment is acceptable; return parameter #56 to
    the recorded value and proceed to the next step. If a          15. Change the service generator and the instrument to
    "null" does not appear, adjust (knife) the Band 3                  Channel 39. Adjust CH39 Sec/Pri/Sgl (parameter #'s 25,
    Secondary coil (L7105) and repeat this step.                       26 and 27) for minimum DC voltage, then repeat the
                                                                       adjustment.
 8. Select parameter #57 and record its present value, then
    adjust parameter #57 through its range (0 - 62). If a "null"   16.Change the service generator and the instrument to
    in the AGC voltage appears, the Band 3 Primary coil                Channel 46. Adjust CH46 Sec/Pri/Sgl (parameter #'s 28,
    (L7104) alignment is acceptable; return parameter #57 to           29 and 30) for minimum DC voltage, then repeat the
    the recorded value and proceed to the next step. If a              adjustment.
    "null" does not appear, adjust (knife) the Band 3 Primary      17. Change the service generator and the instrument to
    coil (L7104) and repeat this step.                                 Channel 50. Adjust CH50 Sec/Pri/Sgl (parameter #'s 31,
                                                                       32 and 33) for minimum DC voltage, then repeat the
                                                                       adjustment.
Electronic RF Alignment
                                                                   18. Change the service generator and the instrument to
Test Point:   U1001 PIN 11 (IF AGC)           Main PCB                 Channel 51. Adjust CH51 Sec/Pri/Sgl (parameter #'s 34,
Adjust:       Parameter #'s 1 thru 54         Range: 0 - 62            35 and 36) for minimum DC voltage, then repeat the
                                                                       adjustment.
 1. Connect the TAG001 Service Generator as described in           19. Change the service generator and the instrument to
    the TAG001 user's manual.                                          Channel 61. Adjust CH61 Sec/Pri/Sgl (parameter #'s 37,
 2. Connect the DC voltmeter to U1001 pin 11 (IF AGC).                 38 and 39) for minimum DC voltage, then repeat the
 3. Set the service generator for Channel 2 output. Tune the           adjustment.
    instrument to receive Channel 2.                               20. Change the service generator and the instrument to
 4. Adjust Channel 2 Secondary (parameter #1) for                      Channel 75. Adjust CH75 Sec/Pri/Sgl (parameter #'s 40,
    minimum DC voltage.                                                41 and 42) for minimum DC voltage, then repeat the
                                                                       adjustment.
 5. Adjust Channel 2 Primary (parameter #2) for minimum
    DC voltage.                                                    21. Change the service generator and the instrument to
                                                                       Channel 101. Adjust CH101 Sec/Pri/Sgl (parameter #'s
 6. Adjust Channel 2 Single-Tuned (parameter #3) for                   43, 44 and 45) for minimum DC voltage, then repeat the
                                                                       adjustment.

                                                                                                              Return to Start
                                                              Page 3-6
CTC185
SERVICE ADJUSTMENTS (Continued)                                                                        Return to Start

22. Change the service generator and the instrument to       24. Change the service generator and the instrument to
    Channel 114. Adjust CH114 Sec/Pri/Sgl (parameter #'s         Channel 125. Adjust CH125 Sec/Pri/Sgl (parameter #'s
    46, 47 and 48) for minimum DC voltage, then repeat the       52, 53 and 54) for minimum DC voltage, then repeat the
    adjustment.                                                  adjustment.
23. Change the service generator and the instrument to
    Channel 122. Adjust CH122 Sec/Pri/Sgl (parameter #'s
    49, 50 and 51) for minimum DC voltage, then repeat the
    adjustment.




                                       Electronic Tuner Alignment Parameters


Parameter #     Parameter Name           Value Range         Parameter #     Parameter Name           Value Range
Chan to                                  Volume to           Chan to                                  Volume to
Change                                   adjust              Change                                   adjust
1 01            Ch. 2 secondary            00-62              1 28           Ch. 46 secondary           00-62
1 02            Ch. 2 primary              00-62              1 29           Ch. 46 primary             00-62
1 03            Ch. 2 single               00-62              1 30           Ch. 46 single              00-62
1 04            Ch. 6 secondary            00-62              1 31           Ch. 50 secondary           00-62
1 05            Ch. 6 primary              00-62              1 32           Ch. 50 primary             00 62
1 06            Ch. 6 single               00 62              1 33           Ch. 50 single              00-62
1 07            Ch. 98 secondary           00-62              1 34           Ch. 51 secondary           00-62
1 08            Ch. 98 primary             00-62              1 35           Ch. 51 primary             00-62
1 09            Ch. 98 single              00-62              1 36           Ch. 51 single              00-62
1 10            Ch. 15 secondary           00-62              1 37           Ch. 61 secondary           00-62
1 11            Ch. 15 primary             00-62              1 38           Ch. 61 primary             00-62
1 12            Ch. 15 single              00 62              1 39           Ch. 61 single              00 62
1 13            Ch. 17 secondary           00-62              1 40           Ch. 75 secondary           00-62
1 14            Ch. 17 primary             00-62              1 41           Ch. 75primary              00-62
1 15            Ch. 17 single              00-62              1 42           Ch. 75 single              00-62
1 16            Ch. 18 secondary           00-62              1 43           Ch. 101 secondary          00-62
1 17            Ch. 18 primary             00-62              1 44           Ch. 101 primary            00-62
1 18            Ch. 18 single              00-62              1 45           Ch. 101 single             00-62
1 19            Ch. 9 secondary            00-62              1 46           Ch. 114 secondary          00-62
1 20            Ch. 9 primary              00-62              1 47           Ch. 114 primary            00-62
1 21            Ch. 9 single               00-62              1 48           Ch. 114 single             00-62
1 22            Ch. 29 secondary           00-62              1 49           Ch. 122 secondary          00-62
1 23            Ch. 29 primary             00-62              1 50           Ch. 122 primary            00-62
1 24            Ch. 29 single              00-62              1 51           Ch. 122 single             00-62
1 25            Ch. 39 secondary           00-62              1 52           Ch. 125 secondary          00-62
1 26            Ch. 39 primary             00-62              1 53           Ch. 125 primary            00 62
1 27            Ch. 39 single              00-62              1 54           Ch. 125 single             00-62




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