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TM 11-6625-3145-14
Verification and Adjustment Procedures-318/338 Service
4. Select the Trigger Menu and set Events to: 00000*WA OFF:WB OFF:WC. This will cause the 338 to acquire
data without triggering.
5. Set the oscilloscope triggering source to channel 1 and the sweep rate to 1 us/div.
6. Repeat the following procedures, (7) through (14), for PODs A through D.
7. Connect the oscilloscope channel 1 probe tip to the test point shown in Table 5-15.
8. Press the START key.
9. Turn the corresponding Pod-Threshold DC BALANCE on the A02 INPUT-B board in Table 5-15 to the
counterclockwise end.
10. Turn this potentiometer clockwise slowly while observing the oscilloscope waveform and mark the point where
the waveform moves from stationary-low level to stationary-high level.
11. Turn the potentiometer to the clockwise end.
12. Turn the potentiometer slowly while observing the oscilloscope waveform and mark the point where the
waveform moves from stationary-high level to stationary-low level.
13. Adjust the potentiometer to the center position between the points you marked in steps (10) and (12).
14. Press the STOP key.
Table 5-15
338 DATA THRESHOLD DC BALANCE
POD
Test Point
Potentiometer
A
TP230 on A02
R320
B
TP140 on A01
R322
C
TP150 on A01
R324
D
TP160 on A01
R326
5. PROBE COMPENSATION FOR THE P6107 EXTERNAL CLOCK PROBE
Equipment Required
None
If you are using a standard 338 Logic Analyzer, you will have one P6107 probe labeled External Clock Probe. This
probe needs to be compensated to 20 pF according to the procedure described in Section 3: Operating
Instructions. See the Probe Compensation paragraph in the Diagnostic Test Descriptions.
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Summary of Contents for 318
Page 119: ...318 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 182: ...338 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 253: ...318 ___________________ TROUBLESHOOTING TREES ...
Page 344: ...338 TROUBLESHOOTING TREES ...
Page 517: ...TM 11 6625 3145 14 318 338 4434 923 318 Block Diagram ...
Page 518: ...TM 11 6625 3145 14 318 338 4434 924 338 Block Diagram ...
Page 519: ...TM 11 6625 3145 14 318 338 4434 925 318 Acquisition Module Wiring Diagram ...
Page 520: ...TM 11 6625 3145 14 318 338 4434 926 318 338 Mainframe Wiring Diagram ...
Page 521: ...TM 11 6625 3145 14 318 338 4434 926 338 Acquisition Module Wiring Diagram ...
Page 522: ...TM 11 6625 3145 14 318 338 4434 928 Figure 9 1 318 A01 Input A Board Component Locations ...
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Page 528: ...TM 11 6625 3145 14 Figure 9 3 318 338 A03 ACQ Control Board Component Locations ...
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Page 542: ...TM 11 6625 3145 14 Figure 9 8 318 338 A10 CRT Board Component Locations ...
Page 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Page 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Page 551: ...TM 11 6625 3145 14 Figure 9 12 338 A01 Input A Board Component Locations ...
Page 553: ...TM 11 6625 3145 14 318 338 SERVICE ...
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Page 555: ...PIN 058584 ...