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TM 55-4920-383-13&P
Table 4-4. Troubleshooting Chart - Continued
Malfunction
Capacitance measure-
ments incorrect.
4. LOW ADJ control (2)
cannot be adjusted
to obtain digital dis-
play (7) reading of
LOW on value stamped
on CAPACITANCE
STANDARDS placard (5).
5. HIGH ADJ control (3)
cannot be adjusted to
obtain digital display
(7) reading of HIGH
value stamped on
CAPACITANCE
STANDARDS placard (5).
Probable cause
CAPACITANCE FUNCTION
switch A2S1, CAPACITANCE
RANGE switch A2S2, inte-
grated circuits A2Z8
through A2Z10 or transis-
tors Q5 through Q10 and
associated circuitry.
a. LOW ADJUST potentiom-
eter R1 open or shorted.
.
b. Capacitor A2C70 open or
shorted, or relay A2K1
inoperative.
a. HIGH ADJUST potentiom-
eter R2 open or shorted.
b. Capacitor A2C69 open or
shorted, or relay A2K2 in-
operative.
Corrective action
Check and replace analog
board A2 as required.
a. Using multimeter,
check and replace
R1 as required.
b. Check and replace
analog board A2 as
required.
a. Using multi meter,
check and replace
R2 as required.
b. Check and replace
analog board A2 as
required.
4-17
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