TM 11-6625-2631-14
Table 6-2. Troubleshooting TS-2530 / UR
Item
Corrective action
No.
Probable cause
Malfunction
1
a. Zero meter. using zero adjustment.
a. Movement not properly zeroed:
Meter does not return to zero or rests
b. Replace test set.
b. Sticking movement, broken
below zero when batteries are not
pivots. bent pointer.
connected.
2
a. Replace test set.
c. Sticking movement. broken pivots,
Meter indication is irregular.
bent pointer.
b. Loose or dirty connector contacts.
b. Clean or tighten contacts as
required.
3
a. Replace test set.
a. Defective meter.
No meter indication regardless which
b. Check wiring against schematic
b. Defective wiring.
type of battery is tested.
diagram (fig. 5-2). Repair wiring.
4
a. With AN / USM-223, check
a. Defective resistor in incremental
No meter indication or faulty meter
values of RI, R2, R3 against
voltmeter circuit.
indication only when tasting K308,
schematic diagram (fig. 5-2).
K308A, URC-10 batteries.
Replace defective resistors.
b. With AN/ USM-223 connected
across CR 1 [positive lead to
cathode: negative lead to anode ).
and any one of the three tested
batteries connected. check that the
voltage drop across CR 1 does not
exceed 9.1 volts 5%. Replace
CR 1 if incorrect voltage is ob-
tained.
c. Check wiring and circuit board
c. Defective wiring.
terminations against fig. 5-2.
Repair or replace, as necessary.
5
a. With AN/ USM-223, check value
a. Defective resistor in incremental
No meter indication or faulty meter
voltmeter circuit.
of R4, R5, R6 against schematic
indication only when testing
diagram, figure 5-2. Replace
AN/ URT-21, AN/ PRC-63,
defective resistors.
AN/ URT-27, or AN/ PRC-90
b. With AN/ USM-223 connected
batteries.
across CR 2 [positive lead to
cathode; negative lead to anode ),
and any one of the four tested
batteries connected, check that the
voltage drop across CR 2 does not
exceed 3.8 volts 5% . Replace
CR2 if incorrect voltage is ob-
tained.
c. Check wiring and circuit board
c. Defective wiring.
terminations against schematic
diagram (fig. 5-2). Repair or
replace, as necessary.
a. With AN/ USM-223, check value
a. Defective resistor in voltmeter
6
No meter indication. or faulty meter
circuit.
of R7, R8 against schematic
indication only when testing SDU-
diagram (fig. 5-2). Replace
5 / E battery.
defective resistors.
b. Check wiring and circuit board
b. Defective wiring.
terminations against schematic
diagram (fig. 5-2). Repair or
replace, as necessary.
Check connector and wiring for
Defective test connector or related
No meter indication, or faulty meter
continuity. Repair or replace, as
wiring.
indcation when only one type of
necessary.
battery is tested.
6-3
