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WARNING!

THE SERVICING INSTRUCTIONS CONTAINED IN THIS MANUAL
ARE FOR USE BY QUALIFIED PERSONNEL ONLY. TO AVOID
ELECTRIC SHOCK, DO NOT PERFORM ANY SERVICING
OTHER THAN THAT CONTAINED IN THE OPERATING
INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO.
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