TM 55-4920-402-13&P
Para/Step
3-8a
3-8a(2)
3-8a(5)
3-8a(8),
(9), (11),
(12)
4-11c(3)
4-11d(4)
(5)(9)
(10) (13)
4-11d
(6) (11), (15)
Table 4-17. Troubleshooting Procedures (Balancer/Phazor)
Trouble
Probable Cause
Probable Remedy
Perform Signal Signal Simulator Field Operational Checkout before
Performing troubleshooting procedure
Phazor Lamp not illuminated
12:00 O’clock Lamp not
illuminated
Improper Indications
Improper Voltages
(Table 4-2)
Improper Voltage
at TP5
Improper Voltage
at TP6
Improper Indications
Improper Voltage
at TP1
1.
2.
1.
2.
Polarity of +28
vdc is wrong
Fuse on
Balancer card
blown
Interrupter Logic
switch incorrect-
ly set
Defective Phazor
Card
Defective Balancer Card
Balancer-Section
Defective Components
+9 vdc Power Supply
Defective
-9 vdc Power Supply
Defective
Meter Circuit or
Associated
Cmponents
(Perform 4-11d(6),
(11),
(15) below if trouble
not corrected)
Accelerometer Input
Circuit Defective
B
1.
2.
1.
2.
Change Polarity;
pin B to (+), pin
A to (-)
Remove cover
and replace fuse
F101 (Fig 4-5)
Check and reset
switch to proper
position
Perform Phazor
Tests (Para 4-12)
P e r f o r m B a l a n c er
Tests (Para 4-11)
Associated com-
ponents (Fig FO-
1, Sheet 1 & 2)
and Perform
Para/Step as re-
quired
Q104 and Q105
(Fig 4-5) and
associated Com-
ponents (Fig FO-
1, Sheet 2)
Q101, Q102,
Q103, (Fig 4-5)
and associated
components (Fig
FO-1, Sheet 2)
U108 (Fig 4-5),
1201 (17) (Fig C-
2), and
associated com-
ponents (Fig FO-
1, Sheet 2)
U110 (Fig 4-5)
and associated
components (Fig
FO-1, Sheet 2)
4-16.2
Change 4
