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Page Title:
Table 6-1. Troubleshooting-Continued |
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 TM 11-6625-537-14-1
Table 6-1. TroubleshootingContinued
Malfunction
Probable cause
Corrective action
c. V202 or V203 faulty
c. Check V202 and V203 by
replacement.
d. Chopper CK1 faulty
d. Check CK1 by replacement.
a. Check V202 by V203 by
10. VOLTS meter cannot be set for
a. V202 or V203 faulty
full scale deflection by adjusting
b. Chopper CK1 faulty
replacement.
VTVM GAIN ADJ R219.
b. Check CK 1 by replacement.
c. Faulty component
c. Locate faulty component by
performing voltage and resistance
measurements on terminals of
V202 and V203. See figure FO-5
for normal value.
a. Check V202 or V203 by
a. V202 or V203 faulty
11. Meter rattle, drift, or error is
observed on all null ranges.
replacement.
b. Check chopper by replacement.
b. Chopper CK1 faulty
c. Clean instrument (para 4-6).
c. Moisture or dirt on printed circuit
boards or switches.
12. Measurements are out of tolerance
a. Refer to depot maintenance
a. Out of calibration
on 500-vok ac range only.
personnel.
b. One or more resistors in 500-volt
b. If attenuator does not remain
ac attenuator ( R543, R533, R535)
stable, locate and replace faulty
has shifted in value.
resistor.
a. Refer to depot maintenance
13. Measurements are out of tolerance
on 50-volt ac range only.
personnel.
b. One or more resistors in 50-volt ac
b. If attenuator does not remain
attenuator (R501, R544, R502)
stable, locate and replace faulty
resistor.
has shifted in value.
14. Measurements are out of tolerance
a. Refer to depot maintenance
on all ac ranges,
personnel.
b. V501 or V502 faulty
b. Check V501 and V502 by
replacement.
c. Locate faulty component by taking
c. Faulty component
voltage
and
measurements at pins of V501
and V502. See figure FO-5 for
normal values.
15. Measurements out of tolerance at
a. Refer to depot maintenance
a specific frequency.
personnel,
b. Locate and replace faulty
capacitor.
capacitor.
Affected range
Capacitor
C504
All
C523, C524, C525
500 only
C501 , C502
50 only
C521
500, 50, and 5
C519, C520
.5 only
Moisture or dirt accumulation within
Clean instrument (para 4-6).
16. Continuity exists
between
common input terminal and
instrument.
chassis ground terminal.
17. Filament voltage for V104, V501,
Isolate faulty
Transistor Q1, Q2, or Q3 defective.
transistor by
and V502 is not within 5,6 and
performing voltage measurements
6.1 vdc.
at transistor terminals. See figure
18. Filament voltage for V104, V501,
V102
faulty.
.
Check V 102 by replacement. Use a
and V502 varies more than 0.020
type OG3 which has been aged
Vdc as line voltage is varied.
for at least 150 hours.
19. Voltage at pin 7 o f Viol
a. Locate faulty component by
a. F a u l t y
component
(unregulated dc for 500-volt dc
performing
resistance
reference supply) is not within
measurements at pins 7, 9, and 2
685 and 869 volts.
of V101 and pin 1 of V104. See
b. V101 faulty.
b. Check V101 by replacement.
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