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TM 11-6625-3145-14
Verification and Adjustment Procedures-318/338 Service
2.
DC Balance
a. Ground the P6107 External Clock probe tip.
b. Enter the Threshold menu and set Threshold LEVEL V1 to 0.0.
c. Press the START key.
d. Turn EXT CLK DC BALANCE R234 on the A02 INPUT-B board to the counterclockwise end.
e. Turn R234 clockwise slowly while observing the oscilloscope waveform and mark the point where the waveform
moves from stationary-low level to stationary-high level.
f. Then turn R234 to the clockwise end.
g. Turn R234 counterclockwise slowly while observing the oscilloscope waveform and mark the point where the
waveform moves from stationary-high level to stationary-low level.
h. Adjust R234 to the center position between the points marked by procedures (e) and (g).
i. Press the STOP key.
3.
DC Gain
a. Connect the P6107 External Clock probe ground clip to the power supply common terminal.
b. Connect the P6107 External Clock probe tip to the power supply plus (+) terminal.
c. Connect the DVM leads to the power supply terminals (low to common, high to +).
d. Adjust the regulated dc power supply output voltage to +10.00 V.
e. Set Threshold LEVEL V1 to +10.0 V.
f. Press the START key.
g. Turn EXT CLK DC GAIN R239 on the A02 INPUT-B board to the counterclockwise end.
h. Turn R239 clockwise slowly while observing the oscilloscope waveform and mark the point where the waveform
moves from stationary-low level to stationary-high level.
i. Turn R239 to the clockwise end.
j. Turn R239 counterclockwise slowly while observing the oscilloscope waveform and mark the point where the
waveform moves from stationary-low level to stationary-high level.
k. Adjust R239 to the center position between the points marked by procedures (h) and (j).
I. Press the STOP key.
B. DATA Threshold DC Balance Adjustment
1.
Setup
a. Ground all the leads of the P6451 Parallel Data probes in both POD A and POD B.
b. Set the oscilloscope triggering source to channel 1 and the sweep rate to 1
µ
s/div.
c. Set Threshold LEVEL V1 = 0.0 V.
d. Select Threshold for POD A = V1, and POD B = V1.
e. Set CLK to EXTT.
f. Select the TRIGGER Menu and set the events field: 00000*WA OFF:WB OFF:WC. This will cause the 318 to
acquire data without triggering.
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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 ...