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TABLE OF CONTENTS (Continued)

3-4 CALIBRATION OUTPUT ADJUSTMENT ...................................................................................................... 30

3-5 A TIMEBASE ALIGNMENT ........................................................................................................................... 30
3-5-1 Slow Sweep Time ................................................................................................................................. 30
3-5-2 Sweep Length ....................................................................................................................................... 30
3-5-3 Fast Sweep Time .................................................................................................................................. 30
3-5-4 Sweep Start Point ................................................................................................................................. 30
3-5-5 Timebase Accuracy Check .................................................................................................................... 30
3-6 A TIMEBASE X10 MAGNIFIER ADJUSTMENT ........................................................................................... 30
3-6-1 Magnifier Positioning ........................................................................................................................... 30
3-6-2 Magnifier Speed Accuracy .................................................................................................................... 30

3-7 B TIMEBASE ALIGNMENT ........................................................................................................................... 30
3-7-1 Slow Sweep Time ................................................................................................................................. 30
3-7-2 Length Adjustment ............................................................................................................................... 31
3-7-3 Sweep Start Point ................................................................................................................................. 31
3-7-4 Fast Sweep Time .................................................................................................................................. 31
3-7-5 Timebase Accuracy Check .................................................................................................................... 31
3-7-6 Start Points Alignment .......................................................................................................................... 31

3-8 VERTICAL AMPLIFIERS ............................................................................................................................... 31
3-8-1 DC Balance Adjustment ........................................................................................................................ 31
3-8-2 Attenuator Step Balance ........................................................................................................................ 30
3-8-3 X1 AC Gain Compensation ................................................................................................................... 31
3-8-4 X10 AC Gain Compensation ................................................................................................................. 31
3-8-5 Gain Calibration ................................................................................................................................... 31
3-8-6 CH-2 Invert Balance Adjustment ........................................................................................................... 32
3-8-7 CH-1/CH-2 Input Capacitance Adjustment ............................................................................................ 32
3-8-8 CH-1/CH-2 Input Attenuator Compensation .......................................................................................... 32
3-8-9 CH-3 Direct Input Capacitance Adjustment ........................................................................................... 32
3-8-10 CH-3 Attenuator Compensation .......................................................................................................... 32
3-8-11 CH-3 Attenuator Input Capacitance Adjustment ................................................................................... 32
3-8-12 CH-3 Gain Adjustment ....................................................................................................................... 32
3-8-13 CH-1 Output Level Adjustment ........................................................................................................... 32
3-8-14 CH-1/CH-2 HF Pulse Response Alignment .......................................................................................... 32
3-8-15 CH-1/CH-2 Frequency Response Check .............................................................................................. 33
3-8-16 CH-1 Output Pulse Response .............................................................................................................. 33
3-8-17 CH-1/CH-2 X10 Magnifier Bandwidth Check ..................................................................................... 33
3-8-18 Vertical Position Control Centering ..................................................................................................... 33
3-8-19 ADD Balance Adjustment ................................................................................................................... 33
3-9 TRIGGER CIRCUITRY ADJUSTMENTS ....................................................................................................... 33
3-9-1 Trigger Balance and Centering Alignments ........................................................................................... 33
3-9-2 Trigger Balance Adjustments for Multitrace Modes ............................................................................... 33
3-9-3 Preset Trigger Adjustment .................................................................................................................... 34
3-9-4 CH-3 Pulse Response Adjustment ......................................................................................................... 34
3-9-5 Internal Trigger-Pulse Response Adjustment ......................................................................................... 34

3-10 X-Y MODE ADJUSTMENTS .................................................................................................................. 34
3-10-1 Gain Adjustment .................................................................................................................................... 34
3-10-2 Balance Adjustment ............................................................................................................................... 34

4. REPLACEMENT PARTS LIST 37

5. BLOCK DIAGRAM, SCHEMATICS AND P.C. BOARDS 51
3. MAINTENANCE AND CALIBRATION
A TIME/DIV switch .................... .5 mS
3-0. The following test equipment is required to perform the B TIME/DIV switch .................... .1 mS
calibration/maintenance procedures described in this section. A VARIABLE control ................. Clockwise
The performance specifications given are the minimum Horizontal POSITION control ........ Centered*
necessary to accurately calibrate the oscilloscope. * Adjusted afterwards for best viewing.
Description Minimum Specifications
1. Digital Voltmeter DC Voltage Range: 0-200 VDC Allow 30 minutes warmup before making any adjust-
Accuracy: +0.5% ments. Remove the top and bottom covers to gain access to test
2. High Voltage DC Voltage Range: 0-2000 VDC points and internal adjustments.
Voltmeter Accuracy: -+ 1%
3. Frequency Counter Frequency Range: 100 Hz - 3-2 POWER SUPPLY CHECK AND ADJUSTMENT
200 MHz
Overall Accuracy: +0.001% 3-2-1 -8 Volt Adjustment
4. Time Mark Generator Marker Outputs: 2nS - 0.5 S with Connect a digital voltmeter's positive lead to the scope
chassis (GND), and the voltmeter's negative lead to TP-5 lo-
calibrated + 5% offset adjust cated on PCB T-3153. Adjust VR-1 for -8.0 V.
Accuracy: -+0.1%
5. Sine Wave Generator Frequency Range: lkHz - 200 kHz
3-2-2 Power Supply Check
Output Level: 15 mV - 5 Vp.p
Check the voltages listed below by moving the
Accuracy: -+.3 dB, 1 MHz - 200
voltmeter's negative lead to chassis ground, and applying the
MHz as frequency is changed positive lead, in turn, to each of the associated test points on
PCB T-3153.
6. Test Oscilloscope 100 MHz Bandwidth
Nominal
7. Square Wave Frequency: 1 kHz - 100kHz, -+1%
Test Point Voltage Tolerance
Generator Output Level: I mV - 1.0 Vp-p,
TP-I +100 +98 VDC 'to 102VDC
-+1%
TP-2 + 50 49 51
Rise Time: 3 nS
TP-3 + 12 11.75 12.25
8. Amplitude Calibrator Output: 1 kHz square wave
TP-4 + 8 7.85 8.15
Frequency Accuracy: -+0.25%
TP-6 +5 4.8 5.2
Output Level: 2 mV - 20 Vp-p
TP-7 + 19 17.5 20.5
9. Capacitance Meter Range: 0-50 pF
Accuracy: --- 1%
3-2-3 High-Voltage Adjustment
3-1. INITIAL SETUP CONDITIONS Turn off the unit under test. Connect the positive lead of a
POWER switch ..................................Pushed in HV voltmeter to chassis ground, and its negative lead to TP-8.
A INTEN control ............................... Centered* Turn the scope on and allow a 2 minute warmup. Adjust VR-2
B INTEN control ................................ Centered* on PCB T-3162 for a reading of - 1950 volts. Connect an X10
probe to the test oscilloscope and hold its tip close to the face
ILLUM control .................................. Clockwise
of the CRT under test. The high-voltage ripple displayed on
FOCUS control .................................. Centered*
the test oscilloscope should be less than 0.1Vp-p.
AC/GND/DC switches ....................... DC
VOLTS/DIV switches ........................ 20mV 3-3. CRT CONTROL ADJUSTMENTS
VARIABLE controls .......................... Clockwise Make sure the controls are set according to the initial
setup conditions in Paragraph 3-1 before starting the following
X10 MAG switches ..................... Pushed in adjustments.
Vertical POSITION controls ............ Centered*. 3-3-1 Intensity Range Adjustment.
PULL QUAD control .................. Pushed in Center the CH- 1 trace on the CRT with the vertical
PULL TRIPLE control .................. Pushed in POSITION control. Set the A INTEN control knob mark to an
V MODE switches ...................... ... CH-1 approximate 45

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