TM 11-5895-1090-34/TO 31 R2-2TSC-152
3-6.
Component Resistance Check
front panel and chassis-mounted components of the
As an aid to troubleshooting, the resistance value of
amplifier-mixer are listed in table 3-2.
Table 3-2. Resistance Check of Amplifier-Mixer Front Panel and Chassis Mounted Components
Item
Additional
of
Test
Meter
Normal
checks and
Check
conditions
conditions
conditions
remarks
No power inputs or signal
inputs to amplifier-
mixer
CB1
Switch:
Disconnect leads from circuit
breaker
ON
0 ohm
∞ ohms
OFF
R1
R1-1,R1-3
A7 assembly removed.
10K ohms
R1-1, center arm of R1
Rotate control from minimum to
0 ohm
maximum resistance.
S1
CAL
S1A-1, S1A-2
Inspect switch for broken or
0 ohm
S1B-7, S1B-8
frayed wires. Rotate switch
X10
S1A-1, S1A-3
through its complete range of
S1B-7, S1B-9
operation. There should be
X1
S1A-1, S1B-4
no binding of contacts.
S1B-7, S1B-10
X01
S1A-1, S1A-5
S1B-7, S1B-11
Inspect switch for broken or
S2
-15V
S2B-1, S2B-2
frayed wires. Rotate switch
S2C-7, S2B-8
through its complete range of
+15V
S2B-1, S2B-3
operation. There should be
S2C-7, S2C-9
no binding of contacts.
+30V
S2B-1, S2B-4
S2C-7, S2C-10
IPAMA
S2A-12, S2A-6
S2B-1, S2B-4
S2C-7, S2C-11
Inspect switch for broken or
CH1
S3
S3-7, S3-1
frayed wires. Rotate switch
CH2
S3-7, S3-2
through its complete range of
CH3
S3-7, S3-3
operation. There should be
CH4
S3-7, S3-4
no binding of contacts
SHF OUT
S3-7, S3-5
S4-common
Press switch.
S4
S4-contact
TB1-8, TB1-1
Disconnect from TB1-8.
XDS1
XDS2-3, XDS2-1
Disconnects leads to XDS2-1,
XDS2
XDS2-2.
XDS2-3, XDS2-2
XF1
Xf1-load
Fuse in socket.
XF1-line
Section III. REMOVAL AND REPLACEMENT
3-7.
Front
Panel
and
Drawer
Mounted
(3) Remove hex nut securing circuit
Components
breaker to front panel.
Refer to figure FO-5 and the following procedures to
(4) Install new circuit breaker and secure to
remove and replace the front panel and drawer mounted
front panel.
components of the amplifier-mixer:
(5) Solder leads to terminals.
a. CB1--ACPOWER Circuit Breaker.
(6) Replace circuit breaker cover and
(1) Remove two screws securing circuit
secure with two screws.
b.
J5-SHF OUTPUT Connector.
breaker cover to front panel and remove cover.
(2) Tag and unsolder leads to circuit
(1) With a torque wrench, loosen and
breaker.
3-2
