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TM 11-6625-3145-14
Verification and Adjustment Procedures-318/338 Service
DC Gain
1. Connect the P6107 External Clock probe ground clip to the power supply minus (-) terminal.
2. Connect the P6107 External Clock probe tip to the power supply plus (+) terminal.
3. Adjust the regulated dc power supply output voltage to + 10.00V as measured by the DVM.
4. Set Threshold LEVEL V1 to +10.0v.
5. Press the START key.
6. Turn EXT CLK DC GAIN R287 on the A02 INPUT-B board to the counterclockwise end.
7. Turn R287 clockwise slowly while observing the oscilloscope waveform and mark the point where the
waveform moves from stationary-low level to stationary-high level.
8. Then turn R287 to the clockwise end.
9. Turn R287 counterclockwise slowly while observing the oscilloscope waveform and mark the point where the
waveform moves from a stationary-high level to a stationary-low level.
10. Adjust R287 to the center position between the points you marked in procedures (7) and (9).
11. Press the STOP key.
Figure 5-49. 338 Threshold voltage adjustment on the A02 INPUT-B board.
DATA Threshold DC Balance Adjustment
1. Ground all the leads of the P6451 Parallel Data probes in all Pods (A through D).
2. Set Threshold LEVEL V1 to 0.0 V.
3. Set the INPUTs for Pods A through D to V1.
5-85
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Страница 542: ...TM 11 6625 3145 14 Figure 9 8 318 338 A10 CRT Board Component Locations ...
Страница 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Страница 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Страница 548: ...TN 11 6625 3145 14 Figure 9 11 318S1 338S1 A07 Serial RS232 Non Volatile Memory Board Component Locations ...
Страница 551: ...TM 11 6625 3145 14 Figure 9 12 338 A01 Input A Board Component Locations ...
Страница 553: ...TM 11 6625 3145 14 318 338 SERVICE ...
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Страница 555: ...PIN 058584 ...