TM 11-6625-3145-14
Verification and Adjustment Procedures-318/338 Service
PARALLEL ANALYZER
4. ADJUST THRESHOLD VOLTAGES ON THE A02 INPUT-B BOARD
Equipment Required
1 Regulated DC Power Supply
1 Digital Multimeter (DMM)
1 Oscilloscope
NOTE
Before starting the following procedures, make sure that all probes are connected
properly.
EXT CLK Threshold Adjustment
Setup
1. Make sure that all four P6451 Parallel Data Probes are connected.
2. Connect the oscilloscope channel 1 probe tip to TP100 on the A01 INPUT-A board.
3. Set the oscilloscope triggering source to channel 1 and the sweep rate to 1 AS/div.
4. Set the EXT CLK Threshold to V1.
5. Set CLK to EXTT.
6. Select the Trigger menu and set the EVENTS field to 00000:WA OFF:WB OFF:WC. This will cause the 338 to
acquire data without triggering.
DC Balance
1. Ground the P6107 External Clock probe tip.
2. Set Threshold LEVEL V1 to 0.0 V.
3. Press the START key.
4. Turn EXT CLK DC BALANCE R284 on the A02 INPUT-B board to the counterclockwise end.
5. Turn R284 clockwise slowly while observing the oscilloscope waveform and mark the point where the
waveform moves from stationary-high level to stationary-low level.
6. Then turn R284 to the clockwise end.
7. Turn R284 counterclockwise slowly while observing the oscilloscope waveform and mark the point where the
waveform moves from stationary-low level to stationary-high level.
8. Adjust R284 to the center position between the points you marked in procedures (5) and (7).
9. Press the STOP key.
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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 ...
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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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