TM 9-4935-481-14-1
Table 3-13. Maintenance Calibration - Continued
Table 3-12. Maintenance Calibration - Continued
STEP
UNIT
PROCEDURE
CORRECTIVE ACTION
STEP
UNIT
PROCEDURE
CORRECTIVE ACTION
When the ALIGN lamp illuminates adjust 1A3A2-R3 slowly ccw until OSC the display just
40
CIP
Observe INHIB lamp illuminated.
51
PPE
switches from LO to HI. Stop the adjustment when the ALIGN lamp is extinguished. Repeat
OSC
as necessary.
41
TTS
Adjust 1A3A1-R30 to 13.0 on the MONITOR meter.
Remove the probe from 1A3A2-J8 and connect it to 1A3A2-J4.
42
PPE
Momentarily actuate TEST START switch (power off).
TTS
52
Adjust 1A3A2-R15 fully cw.
Dynamic Gain Threshold (1A3)
TTS
53
When the ALIGN lamp illuminates adjust 1A3A2-R15 slowly ccw OSC until the display just starts
PPE
43
Adjust 1A3A2-R3 to mid-range (approximately 12 turns from either end).
54
to switch from LO to HI. Do not make adjustment when the ALIGN lamp is extinguished.
OSC
44
Connect a 10215396 cable to the oscilloscope A INPUT, the white probe to 1A3A2-J8 and the
Momentarily actuate TEST START switch (power off).
PPE
black probe to 1A3A1-J13.
55
Remove the probe from 1A3A2-J4.
NOTE
56
RUN/HOLD/OFF switch to OFF.
CIP
Leave the black probe connected to 1A3A1-J13 throughout this procedure.
57
IR Pulse Width
45
PPE
SEQUENCE switch to MNL.
46
CIP
COUNTER INHIBIT(SEC) dial to 18.00.
58
Connect the white probe from the oscilloscope to 1A4A2-J5.
PPE
47
PPE
Momentarily actuate TEST START switch (power on).
Momentarily actuate TEST START switch (power on).
59
48
CIP
Observe INHIB lamp illuminated.
Adjust 1A4A2-R8 for a pulse width of 20.0 0.4 msec. (If TTS GO or NO-GO lamps illuminate
60
during adjustment, momentarily actuate PPE TEST START switch twice to reset.)
49
PPE
SEQUENCE switch to ALIGN 1.
PPE
Momentarily actuate TEST START switch (power off).
61
50
TTS
Adjust 1A3A2-R3 fully cw.
Clamp Level Thresholds (1A5/1A6)
NOTE
PPE
62
SEQUENCE switch to MNL.
In the following steps the output will oscillate at the switching point. The required
CIP
point of adjustment is where the oscillations just begin.
63
COUNTER INHIBIT(SEC) dial to 00.25.
CIP
64
RUN/HOLD/OFF switch to RUN.
PPE
65
Momentarily actuate TEST START switch (power on).
CIP
66
Observe INHIB lamp illuminated.
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