TM9-4935-481-14-1
C3
STEP
UNIT
PROCEDURE
CORRECTIVE ACTION
STEP
UNIT
PROCEDURE
CORRECTIVE ACTION
354
MCP
Reconnect the cable from J16 to the Counter B INPUT.
Detector B-Envelope A, Positive Slope (1246-1332)
368
OSC
- - + trigger slope switch to +.
Detector B Envelope, Negative Slope (1143-1355)
369
MCP
Disconnect the cable between J12 and the oscilloscope B INPUT.
355
OSC
Connect a 10215396 cable to the A INPUT and the white probe to
370
OSC
A20-TP6 (GRN) and the black probe to J33 (GND).
356
OSC
A input coupling switch to DC.
overshoot
357
OSC
Observe a waveform (*cycling from 0 to -5 Vdc, with a 1/2 cycle
duration of 12.50 msec) with a rise and decay time of 0.442
0.022 msec. (measure between 10% and 90% amplitude).
371
OSC
Adjust A20-R19 until the distortion or overshoot is eliminated
*for reference only
or minimized. If A20-R19 has no effect, set it to mid-range.
358
OSC
TIME/DIV switch to 50 SEC.
372
Remove the probe from A20-TP6 (GRN) and J330
359
OSC
A & B VOLTS/DIV switches to 1.0.
360
OSC
INT EXT trigger mode switch to INT.
361
OSC
- + trigger slope switch to -,
373
MCP
SELECTOR A switch to Fl.
362
OSC
MODE switch to A + B.
374
MCP
Adjust COMPARATOR THRESHOLD B control to +2.500 0.005 Vdc.
363
MCP
DMM
364
OSC
B INPUT coupling switch to DC.
375
CT
FUNCTION switch to FREQ A.
365
MCP
SELECTOR A switch to I-8.
376
CT
A INPUT switch to pos,
366
OSC
377
CT
FREQ/TIME/MULT switch to 1060
378
MCP
SELECTOR B switch to H240
overshoot
379
TKP
Adjust FREQ control fully cw and ccw and observe readings from
CT
< 4500 Hz to> 12000 Hz.
367
OSC
Adjust A20-R16 until the distortion or overshoot is eliminated or
380
TKP
Adjust FREQ control to 8300 50 Hz.
minimized. Adjustment of R16 will have a very minimal effect
CT
and care is required for this adjustment. If A2O-Rl6 has no
381
MCP
Connect a cable from J13 to the oscilloscope A INPUT.
effect, set it to mid-range.
382
OSC
CHANNEL A VOLTS/DIV switch to .05,
383
OSC
Adjust A21-R6 until the lower peaks of the sine wave displayed
are at 0,0000 0.0050 Vdc.
3-71