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TCM850FEF0


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                                        S/M No.TCM850FEF0



Service Manual
CHASSIS : CM-850FX
MODEL : DTF-2930MH
        DTF-29S7MH
        DTF-29S8MH




   Caution
   : In this Manual, some parts can be changed for improving. their
     performance without notice in the parts list. So, if you need the
     latest parts information, please refer to PPL(Parts Price List)in
     Service Information Center.




                                                        Nov. 2006
CM-850FX Service Manual



                                  CONTENTS


1 MAIN FEATURES                                                             3
  1.1 SPECIFICATIONS                                                        3
  1.2 REMOTE CONTROL                                                        3
  1.3 CHANNEL/FREQUENCY TABLE                                               4
  1.4 ATSS SORTING METHOD                                                   6

2 SAFETY INSTRUCTION                                                        7

3 ALIGNMENT INSTRUCTIONS                                                    8
  3.1 MICROCONTROLLER CONFIGURATION : SERVICE MODE                          8
  3.2 SERVICE MODE NAVIGATION                                               8
  3.3 CONTROL BITS                                                          9

4 IC DESCRIPTION                                                           18
   4.1 TELETEXT DECODER WITH EMBEDDED 8-BIT CONTROLLER                     18
   4.2 COLOR DECODER AND SCAN-RATE CONVERTER                               20
   4.3 DDP 3315C - DISPLAY AND DEFLECTION PROCESSOR                        30
   4.4 MSP341X MULTISTANDARD SOUND PROCESSOR                               35
   4.5 TDA4470-MULTISTANDARD VIDEO-IF AND QUASI PARALLEL SOUND PROCESSOR   39
   4.6 TDA894XJ STEREO AUDIO AMPLIFIER                                     41
   4.7 TDA835XJ VERTICAL AMPLIFIER                                         42
   4.8 TDA6108JF                                                           44
   4.9 M24C32                                                              45
   4.10 STR - X6757                                                        46

5 CM-850FX CHASSIS DESCRIPTION                                             49
  5.1 BLOCK DIAGRAM                                                        49
  5.2 IF SECTION                                                           50
  5.3 VIDEO / RGB                                                          53
  5.4 MICROCONTROLLER                                                      57
  5.5 TELETEXT DISPLAY                                                     59
  5.6 SOUND PROCESSING                                                     60
  5.7 SOUND AMPLIFICATION                                                  61
  5.8 VERTICAL DEFLECTION                                                  62

6 SERVICE PARTS LIST                                                       63
7 SCHEMATIC DIAGRAM                                                        72
8 PRINTED CIRCULT BOARD                                                    74
9 EXPLODED VIEW                                                            77



                                       -2-
                                                                                        CM-850FX Service Manual

1 MAIN FEATURES
1.1 SPECIFICATIONS
1.1. 1 GENERAL
    TV standard                  PAL/SECAM-B/G, H, D/K, I
    Colour system        Tuner   PAL, SECAM
                         AV      PAL, SECAM, PAL 60, NTSC M, NTSC 4.43
    Sound system                 B/G, H, D/K, I
    Rated Voltage                AC 110 - 250V, 50/60Hz
    Power
                                 120W approx.
    consumption
    Sound Output Power           7W x 2 (at 80% mod, 10%THD)
    Speaker                      12W 8 ohm x2
    Teletext system              10 pages memory FASTEXT (FLOF or TOP)
    Aerial input                 75 ohm unbalanced
    Channel Conerage VHF         BAND I : CH02 ~ CH04(48.25MHz ~ 62.25MHz)
                                 BAND II : CH05 ~ CH12(175.25MHz ~ 224.25MHz)
                                 CABLE BAND : S01 ~ S03, (69.25MHz ~ 83.25MHz)
                                                S01 ~ S20, (105.25MHz ~ 294.25MHz)
                                 HYPER BAND : S21 ~ S41(303.25 ~ 463.25MHz)
                          UHF    BAND IV, V : CH21 ~ CH69(471.25MHz ~ 855.25MHz)
    Tuning system                frequency synthesiser tuning system
    Visual screen size
                                 68cm
    Channel indication           On Screen Display
    Program Selection            200 programmes
    Aux. terminal                AV1 input 
                                 AV2 input 
                                 DVD1, DVD2
                                 OUTPUT 
    Remote Control               R-55C03

1.2 Remote Control
TV MODE                                                                                    TELETEXT MODE
  POWER                                                                                      POWER
  SOUND MUTE                                                                                 SOUND MUTE
  NUMBER 0..9                                                                                NUMBER 0..9
  TV / AV
  NORMAL
  RECALL
  MENU                                                                                       VOL/BRIGHT MENU SELECTION
  PROGRAM UP (CURSOR UP)                                                                     PAGE UP
  VOLUME DOWN (CURSOR LEFT)                                                                  VOL / BRIGHT DOWN
  VOLUME UP (CURSOR RIGHT)                                                                   VOL / BRIGHT UP
  PROGRAM DOWN (CURSOR DOWN)                                                                 PAGE DOWN
  MODE
  OK / PRESET                                                                                INDEX
  PIP ON                                                                                     RED
  PIP PICTURE SWAP/FREEZE                                                                    GREEN
  PIP POSITION                                                                               YELLOW
  PIP PICTURE SOURCE                                                                         CYAN
                                                                                             CANCEL
                                                                                             PAGE HOLD
  TV     TELETEXT                                                                            TELETEXT TV
                                                                                             REVEAL
                                                                                             SUBPAGE
  PIP PICTURE SIZE                                                                           HEIGHT
  SLEEP
  ZOOM
  3D (SOUND EFFECT)
                                                                              -3-
CM-850FX Service Manual


1.3 CHANNEL/FREQUENCY TABLE
 1.3.1 CHANNEL/FREQUENCY TABLE
 CHANNEL         EUROPE CCIR       FRANCE       GB(IRELAND)   EAST OIRT
   C01              46.25              -            45.75        49.75
   C02               48.25         55.75 (L )       53.75        59.25
   C03               55.25         60.5 (L )        61.75        77.25
   C04               62.25        63.75 (L )       175.25        85.25
   C05              175.25          176.00         183.25        93.25
   C06              182.25          184.00         191.25       175.25
   C07              189.25          192.00         199.25       183.25
   C08              196.25          200.00         207.25       191.25
   C09              203.25          208.00         215.25       199.25
   C10              210.25          216.00         223.25       207.25
   C11              217.25       189.25 (LUX)      231.25       215.25
   C12              224.25        69.25 (L )       239.25       223.25
   C13               53.75        76.25 (L )       247.25          -
   C14                 -          83.25 (L )        49.75          -
   C15              82.25            90.25          57.75          -
   C16                 -             97.25          65.75          -
   C17              183.75             -            77.75          -
   C18              192.25             -            85.75          -
   C19              201.25             -              -            -
   C20                 -               -              -            -
   C21              471.25          471.25         471.25       471.25
   C22              479.25          479.25        4 79.25       479.25
   C23              487.25          487.25         487.25       487.25
   C24              495.25          495.25         495.25       495.25
   C25              503.25          503.25         503.25       503.25
   C26              511.25         511.25 5         11.25       511.25
   C27              519.25          519.25         519.25       519.25
   C28              527.25          527.25         527.25       527.25
   C29              535.25          535.25         535.25       535.25
   C30              543.25          543.25         543.25       543.25
   C31              551.25          551.25         551.25       551.25
   C32              559.25          559.25         559.25       559.25
   C33              567.25          567.25         567.25       567.25
   C34              575.25          575.25         575.25       575.25
   C35              583.25          583.25         583.25       583.25
   C36              591.25          591.25         591.25       591.25
   C37              599.25          599.25         599.25       599.25
   C38              607.25          607.25         607.25       607.25
   C39              615.25          615.25         615.25       615.25
   C40              623.25          623.25         623.25       623.25
   C41              631.25          631.25         631.25       631.25
   C42              639.25          639.25         639.25       639.25
   C43              647.25          647.25         647.25       647.25
   C44              655.25          655.25         655.25       655.25
   C45              663.25          663.25         663.25       663.25
   C46              671.25          671.25         671.25       671.25
   C47              679.25          679.25         679.25       679.25
   C48              687.25          687.25         687.25       687.25
   C49              695.25          695.25         695.25       695.25
   C50              703.25          703.25         703.25       703.25
   C51              711.25          711.25         711.25       711.25
   C52              719.25          719.25         719.25       719.25
   C53              727.25          727.25         727.25       727.25
   C54              735.25          735.25         735.25       735.25
   C55              743.25          743.25         743.25       743.25
   C56              751.25          751.25         751.25       751.25
   C57              759.25          759.25         759.25       759.25
   C58              767.25          767.25         767.25       767.25

                                          -4-
                                        CM-850FX Service Manual


CHANNEL   EUROPE CCIR   FRANCE      GB(IRELAND)      EAST OIRT
  C59        775.25      775.25        775.25          775.25
  C60        783.25      783.25        783.25          783.25
  C61        791.25      791.25        791.25          791.25
  C62        799.25      799.25        799.25          799.25
  C63        807.25      807.25        807.25          807.25
  C64        815.25      815.25        815.25          815.25
  C65        823.25      823.25        823.25          823.25
  C66        831.25      831.25        831.25          831.25
  C67        839.25      839.25        839.25          839.25
  C68        847.25      847.25        847.25          847.25
  C69        855.25      855.25        855.25          855.25
  C70        863.25      863.25        863.25          863.25
  C71         69.25        -             -               -
  C72         76.25        -             -               -
  C73         83.25        -             -               -
  C74         90.25        -             -               -
  C75         97.25        -             -               -
  C76         59.25        -             -               -
  C77         93.25        -             -               -
  S01        105.25      104.75        103.25          105.25
  S02        112.25      116.75        111.25          112.25
  S03        119.25      128.75        119.25          119.25
  S04        126.25      140.75        127.25          126.25
  S05        133.25      152.75        135.25          133.25
  S06        140.25      164.75        143.25          140.25
  S07        147.25      176.75        151.25          147.25
  S08        154.25      188.75        159.25          154.25
  S09        161.25      200.75        167.25          161.25
  S10        168.25      212.75          -             168.25
  S11        231.25      224.75          -             231.25
  S12        238.25      236.75          -             238.25
  S13        245.25      248.75        255.25          245.25
  S14        252.25      260.75        263.25          252.25
  S15        259.25      272.75        271.25          259.25
  S16        266.25      284.75        279.25          266.25
  S17        273.25      296.75        287.25          273.25
  S18        280.25      136.00        295.25          280.25
  S19        287.25      160.00        303.25          287.25
  S20        294.25        -             -             294.25
  S21        303.25      303.25          -             303.25
  S22        311.25      311.25        311.25          311.25
  S23        319.25      319.25        319.25          319.25
  S24        327.25      327.25        327.25          327.25
  S25        335.25      335.25        335.25          335.25
  S26        343.25      343.25        343.25          343.25
  S27        351.25      351.25        351.25          351.25
  S28        359.25      359.25        359.25          359.25
  S29        367.25      367.25        367.25          367.25
  S30        375.25      375.25        375.25          375.25
  S31        383.25      383.25        383.25          383.25
  S32        391.25      391.25        391.25          391.25
  S33        399.25      399.25        399.25          399.25
  S34        407.25      407.25        407.25          407.25
  S35        415.25      415.25        415.25          415.25
  S36        423.25      423.25        423.25          423.25
  S37        431.25      431.25        431.25          431.25
  S38        439.25      439.25        439.25          439.25
  S39        447.25      447.25        447.25          447.25
  S40        455.25      455.25        455.25          455.25
  S41        463.25      463.25        463.25          463.25

                              -5-
CM-850FX Service Manual



1.4 ATSS SORTING METHOD

The TV set sweeps all the TV bands from beginning of VHF to end of UHF. The TV controlling software for each
program checks if a VPS CNI code is transmitted (this system exists for German, Swiss and Austrian transmissions).
If no VPS CNI code is found, then the system checks if a CNI code is transmitted as part of the teletext transmission
( Packet 8/30 format 1 and format 2). If such a code ( VPS or teletext ) is found and if this code is in the ATSS list, the
program is automatically named.
If the transmission does not have VPS CNI, and no teletext service is available, then there is no possibility of the
program being automatically named.
The programs found are then sorted in 4 groups :

Group I : It contains all the programs from the selected country and named by the TV controlling software. Within this
group the sorting order is fixed by the ATSS list.
Group II : It contains all the programs with a strong signal strength which are not listed in group I.
Group III : It contains all the programs with a weak signal strength which are not listed in group I.
Group IV : If two or more programs with the same code are found, only the strongest ( or if they have the same level
the one with the lowest frequency) is listed in group I, II or III. The others are listed in group IV.


1.4.1 GENERAL CASE                                                1.4.2 SPECIAL CASE
  Program                                                             Program
                            Group                Skip                                      Group                Skip
  number                                                              number
      1                                                                   1
      2                    Group I                                       ...              Group II
     ...                                                                 m
      n                                                                 m+1
    n+1                                                                  ...              Group III
     ...                   Group II                                       p
     m                                                                  p+1
    m+1                                                                  ...              Group IV
     ...                  Group III                                       q
      p                                                                 q+1
    p+1                                                                  ...              not used
     ...                  Group IV                                       99
      q                                                                   0
    q+1
                                                                  Special case : Country selection = Others
     ...                  not used
     99
      0




                                                            -6-
                                                                CM-850FX Service Manual



2 SAFETY INSTRUCTION

WARNING: Only competent service personnel may carry out work involving the testing or repair
of this equipment.

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid
   such hazards, the high voltage must not exceed the specified limit. The nominal value of the
   high voltage of this receiver is 25-26 KV (20"-21") or 28 KV (28" - 29") at max beam current.
   The high voltage must not, under any circumstances, exceed 27.5 KV (20"), 29KV (21"),
   30 KV (28") or 31 KV (29"). Each time a receiver requires servicing, the high voltage should
   be checked. It is important to use an accurate and reliable high voltage meter.

2. The only source of X-RAY Radiation in this TV receiver is the picture tube. For continued X-
   RAY RADIATION protection, the replacement tube must be exactly the same type tube as
   specified in the parts list.

SAFETY PRECAUTION

1. Potentials of high voltage are present when this receiver is operating. Operation of the
   receiver outside the cabinet or with the back board removed involves a shock hazard from
   the receiver.
 1) Servicing should not be attempted by anyone who is not thoroughly familiar with the
     precautions necessary when working on high voltage equipment.
 2) Always discharge the picture tube to avoid the shork hazard before removing the anode cap.
 3) Discharge the high potential of the picture tube before handling the tube. The picture tube is
     highly evacuated and if broken, glass fragments will be violently expelled.
2. If any Fuse in this TV receiver is blown, replace it with the FUSE specified in the
   Replacement Parts List.
3. When replacing a high wattage resistor (metal oxide film resistor) in the circuit board, keep
   the resistor 10 mm away from circuit board.
4. Keep wires away from high voltage or high temperature components.
5. This receiver must operate within AC 110 - 250V, 50/60Hz. NEVER connect to a DC supply
   or any other voltage or frequency.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this equipment have special safety-related
characteristics. These characteristics are often passed unnoticed by a visual inspection and the
X-RAY RADIATION protection afforded by them cannot necessarily be obtained by using
replacement components rated for higher voltage, wattage, etc. Replacement parts which have
these special safety characteristics are identified in this manual and its supplements, electrical
components having such features are identified by designated symbol on the parts list. Before
replacing any of these components, read the parts list in this manual carefully. The use of
substitutes replacement parts which do not have the same safety characteristics as specified in
the parts list may create X-RAY Radiation.


                                               -7-
CM-850FX Service Manual



3 ALIGNMENT INSTRUCTIONS
3.1MICROCONTROLLER CONFIGURATION : SERVICE MODE
To switch the TV set into service mode please see instruction below.
1 - Select PR. number 91
2 - Adjust sharpness to minimum and exit all menus.
3 - Within 2 seconds press the key sequence : RED - GREEN - menu
The software version is displayed beside the word Service, e.g. "SERVICE V1.00".
To exit SERVICE menu press menu key or Stand By key.
3.2 SERVICE MODE NAVIGATION
Pr Up/Down remote keys : cycle through the service items available.
Vol -/+ remote keys        : Dec./Increment the values within range - Cycle trough option bits.
OK key                     : Toggle bits in option byte

                    Order              Item              Default setting
                      1            HOR CEN
                      2            RED GAIN
                      3            GRN GAIN
                      4           BLUE GAIN
                      5            RED BIAS
                      6            GRN BIAS
                      7           AGC LEVEL
                      8          G2 - SCREEN
                      9                AFT
                     10             OPTION1
                     11             OPTION2
                     12             OPTION3
                     13             OPTION4
                     14                AVL
                     15           PARABOLA
                     16          HOR WIDTH
                     17           CORNER T
                     18           CORNER B
                     19          HOR PARAL
                     20             V.LINEAR
                     21          EW TRAPEZ
                     22          S CORRECT
                     23          VERT CENT
                     24            VERT SIZE
                     25            SHIPPING
                     26           INST. LOCK
                     27            LKB LOCK                HOTEL
                     28           AV1 START               FUNCTION
                     29            MAX. VOL
                     30              H.BOW




                                               -8-
                                                                      CM-850FX Service Manual




3.3 CONTROL BITS

There are four option bytes available (32 bits in all). These option bits are available from
FACTORY and SERVICE mode. First find the OPTION1, OPTION2,OPTION3 or OPTION4
control, and then use the UP/DOWN and PLUS/MINUS keys on the relevant remote keypad to
control the bits. The table below shows the two option bytes available;

 3.3.1 OPTION 1

                                         Headphone
      TOP        FASTEX        TUBE      Volume/Bal       Dolby      SVHS3         TUNER OPTIONS
     Teletext    T (FLOF)       4:3     ance control      Virtual    disabled         00 = Philips
      OFF           OFF                     OFF            OFF                       01 = Not used
                                                                                        10 = Alps
      TOP        FASTEX        TUBE     Headphone         Dolby      SVHS3         11 = Parstnic (DW)
     Teletext    T (FLOF)       16:9    Volume/Bal        Virtual    enabled
       ON           ON                  ance control       ON
                                            ON


 3.3.2 OPTION 2


                               AVL        PICTURE         Program
      Fixed to    Fixed to    control     TILT ON            list
                               OFF                        enabled      See later description under
         0           0
                               AVL                        Program      CONTROL DESCRIPTION.
                                          PICTURE
                              control     TILT OFF           list
                               ON                         disabled



 3.3.3 OPTION 3


                               Local       Local         Curtain     Curtain       Koran          Koran
                             keyboard    keyboard :      Beeper      Disabled    direct key      Disabled
     Not used, must be                     6 keys        Disabled                Disabled
     set to 1 for future
       compatibility                       Local         Curtain     Curtain       Koran         Koran
                               Local     keyboard :      Beeper      Enable      direct key      Enable
                             keyboard      5 keys        Enable                   Enable




 3.4.4 OPTION 4


                                                           PIP
           Not used, must be set to 1 for future         Disabled
                                                                                Teletext table
                      compatibility
                                                           PIP
                                                          Enable


                                                   -9-
CM-850FX Service Manual




3.4 USER GUIDE

3.4.1 ENTERING FACTORY MODE
To switch the TV set into FACTORY mode, use the factory remote control, and press on SVC .
The factory menu will appear on the screen, showing FACTORY Vx.xx (where x.xx is the
software version).

3.4.2 ENTERING OPTION BITS MENU
To find the option bits, by using the PR+ or PR- in FACTORY mode.
To find OPTION2 press the button OPT a second time (and one more time for OPTION3, OPTION4).

3.4.3 ELECTING OPTION BITS
From left to right, bits 7 to 0 are shown. Navigation is done from the with the remocon
with the VOL MIN and VOL MAX buttons (otherwise known as EAST, WEST). The selected bit is
highlighted.

3.4.4 TOGGLING OPTION BITS
This is done by using the PR UP and PR DOWN buttons (otherwise known as NORTH, SOUTH).

3.4.5 EXITING OPTION BITS MENU
By using the PR+ or PR- in FACTORY mode. The full sequence enter to exit is;
FACTORY(refer to page 8) -> OPTION1 -> OPTION2 -> OPTION3 -> OPTION4 -> FACTORY

3.4.6 AFTER SETTING OPTION BITS
Before operate shipping mode, it is necessary to push the NORMAL key to obtain
NORMAL I. This will reset all the sound and brightness settings to a factory defined level, as well
as some other settings such as sound PRESET and WAKE TIME/PROG.
Then, Operating the shipping mode, these levels are memorised in the television, ready for
packing and delivery.

3.4.7 VERIFICATION
On operating the shipping mode, a four digit hexadecimal number is displayed in addition to
 SHIPPING . This number is there to verify the option bits setting that has been entered. For
example the binary code 0000 0111 (OPTION2) 1100 0010 (OPTION 1) will give 07 C2 hex. The
order of display is therefore OPTION2 then OPTION1 when reading from left to right.
From software version 1.00, 4 option bytes are available. The order of display from left to right
is OPTION4, OPTION3, OPTION2, OPTION1.




                                                  -10-
                                                                CM-850FX Service Manual




3.5 CONTROL DESCRIPTION

3.5.1 OPTION 1 BITS

3.5.2 TOP Teletext (Bit 7)
Enables/disables the TV from displaying TOP row 24 link titles, and the dedicated TOP menu
table. A FLOF (if available) or SIMPLE / PAGETRACE presentation will be used.

3.5.3 FLOF/Fastext (Bit 6)
Enables/disables the TV from displaying FLOF row 24 link titles. A TOP (if available) or SIMPLE /
PAGETRACE presentation will be used.

3.5.4 Tube (Bit 5)
Define as 4:3 or 16:9 tube. This will permit the ZOOM function to understand the formats that
should be available.

3.5.5 Headphone Volume & Balance controls (Bit 4)
If enabled, this function will make available supplementary VOLUME and BALANCE controls in
the SOUND menu, dedicated to headphone control. This has NO effect if JVC remote control is
active (OPTION 2, Bit 6).
Important : This requires dedicated hardware connection from the MSP to the user headphone
connection. MSP output pin DACA_L and DACA_R are available to connect to external
amplifier for HeadPhone. Volume and balance curves/Levels are the same as the speaker
channel.

3.5.6 Dolby Virtual (Bit 3)
Allows Dolby Virtual (trademark) 3D effect to be available from the user control (button 3D ).
Note : Dolby Virtual is only available with the MSP34x1.

3.5.7 SVHS3 (Bit 2)
Enables the SVHS3 external input to be selected by the user with the EXTERNAL button on the
user remote control.
Note : Front SVHS (4 pin) socket needs to be available.

3.5.8 Tuner (Bits 1 & 0)
Configures the software to communicate with the tuner via i2c bus. Incorrect configuration may
not be immediately obvious, but will result in loss of functionality.




                                               -11-
CM-850FX Service Manual




3.6 OPTION 2 BITS

3.6.1 Remote control(Bit 7, Bit6)
This is not intended to be changed by use of the FACTORY remote control.

3.6.2 AVL function displayed (Bit 5)
To control whether the user has the AVL (Automatic Volume Limiting) control in the SOUND
menu or not.

3.6.3 Picture Tilt (Bit 4)
This controls the picture tilt by means of the PWM port 2 on the DDP. This requires the addition
of hardware that is not available on the CM-850FX chassis.
Therefore, for CM-850FX chassis (without modifications) this bit should be set to 0 to deactivate the
control in PICTURE menu.


3.6.4 CRT Beam Current (Bits 2, 1& 0)

                   Beam Current(mA)
     bits                                                     Tube
                  Nominal    Maximum

                     0.95



                                            4/3 and 16/9 (Philips CRT) SuperFlat.




3.6.5 Program list (Bit 3)
This enable(1) or disable(0) the access to program list menu with CYAN key.




                                                -12-
                                                                     CM-850FX Service Manual




3.7 OPTION 3 BITS

3.7.1 KORAN option (Bit0)
This enable(0) or disable(1) the access to Koran menu.

3.7.2 Koran direct key (Bit1)
This enable(0) or disable(1) the access to Koran pray with YELLOW ke y, when ARABIC
language is selected.

3.7.3 Curtain (Bit2)
This enable(0) or disable(1) the curtain, when power on and power off.

3.7.4 Curtain Beeper (Bit3)
This enable(0) or disable(1) the curtain Beeper, when power on.

3.7.5 Lkb (Bit4 & 5)
Bit4 set to 1 :
Key                Pr Up          Pr Dwn            Vol Up       Vol Dwn   TV/AV      Menu
Level             <215mV          215mV~            625mV~       1.02V~    1.41V~    1.79V~
                                  625mV             1.02V        1.41V     1.79V     2.3V


Bit4 set to 0:

Key                Pr Up          Pr Dwn            Vol Up       Vol Dwn   TV/AV
Level             <290mV          290mV~            670mV~       1.13V~    1.70V~
                                  670mV             1.13V        1.70V     2.17V

Bit5 : reserved for future.
3.8 OPTION 4 BITS

3.8.1 TELETEXT option (Bit0 &1 &2)



                                                       Bit 2, 1& 0
                              Latin West                    000
                              Latin East                    001
                              Russia                        010
                              Persia                        011
                              Arabic                        100
                              Reserved for future           101
                              Reserved for future           110
                              Automatic                     111


Note : When you change Teletext option, you must start again the TV.

                                                     -13-
CM-850FX Service Manual




  Teletext National Option table for each language option:

  Teletext table              Basic Char.     Twist Char. Set        Packet 26
                                 Set
                                Latin              Latin        English
                                Latin              Latin        German
                                Latin              Latin        Swedish/Fin
  Latin West                    Latin              Latin        Italian
                                Latin              Latin        French
                                Latin              Latin        Spanish/Portuguese
                                Latin              Latin        Turkish
                                Latin              Latin        Greek
                                Latin              Latin        Polish
                                Latin              Latin        German
                                Latin              Latin        Hungarian
  Latin East                    Latin              Latin        Italian
                                Latin              Latin        French
                                Latin              Latin        Serbian
                                Latin              Latin        Czech/Slovak
                                Latin              Latin        Rumanian
                                Latin              Latin        English
                                Latin              Latin        German
                                Latin              Latin        Estonian
                                Latin              Latin        Lettish
  Russian
                                Cyrilic            Latin        Russia
                                Cyrilic            Latin        Ukrainian
                                Latin              Latin        Czech/Slovak
                                Latin              Latin        Rumanian
                                Latin              Latin        English
                                Latin              Latin        French
                                Latin              Latin        French
                                Latin              Latin        Turkish
  Arabic
                                Latin              Latin        French
                                Latin              Latin        Hebrew
                                Latin              Latin        French
                                Arabic             Latin        Arabic
                                Latin              Latin        English
                                Latin              Latin        French
                                Latin              Latin        French
  Persian                       Latin              Latin        Turkish
                                Latin              Latin        French
                                Latin              Latin        Hebrew
                                Latin              Latin        French
                                Arabic             Latin        Farsi

  3.8.2 PIP (Bit3)

  This enable(0) or disable(1) the PIP.

  Note : When you switch from disable to enable, you must start again the TV.
                                            -14-
                                                                       CM-850FX Service Manual




3.9 TV SET ALIGNMENT

3.9.1 LOCAL OSCILLATOR ALIGNMENT
Tune a colour bar pattern. The frequency of the signal carrier must be accurate (Max +/- 10KHz
deviation from the nominal channel frequency).
Find AFT item in service mode.
Adjust the coil L150 to bring the cursor to central position : 32.
3.9.2 G2 ALIGNMENT
- Tune a colour bar pattern.
- Find the G2 - SCREEN item in service mode.
- Adjust screen volume ( on FBT ) to bring the cursor to central position : 32.




                                                    -15-
CM-850FX Service Manual




3.9.3 WHITE BALANCE
- Select a dark picture and adjust RED BIAS and GRN BIAS to the desired colour temperature.
- Select a bright picture and adjust RED, GRN and BLUE GAIN to the desired colour temperature.

3.9.4 FOCUS
Adjust the Focus volume ( on FBT ) to have the best resolution on screen.

3.9.5 VERTICAL GEOMETRY
Adjust V. LINEAR (linearity), S CORRECT (S. Correction), VERT SIZE (Vertical amplitude), VERT CENT (vertical
centring) to compensate for vertical distortion.




3.9.6 HORIZONTAL PICTURE CENTRING
Adjust HOR CEN (Horizontal centre) to have the picture in the centre of the screen.

3.9.7 EAST / WEST CORRECTION
Adjust the PARABOLA, HOR WIDTH, CORNER, HOR PARAL, EW TRAPEZ, H BOW, to compensate for
geometrical distortion.




                                   HOR PARAL




                                   HOR WIDTH
                             adjust for 90% overscan.


                                                         -16-
                                                                                CM-850FX Service Manual




                                                      PARABOLA




                                               CORNER B & CORNER T




                                                      EW TRAPEZ




                                                        H BOW

3.9.8 AGC
 - Make sure option bits are correct for the tuner fitted on the chassis (See above how to change option bits).
 - Adjust the antenna signal level at 62 dB V



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