TM 11-6130-392-34
Table 4-3. Troubleshooting Test Procedures
Column 3
Column 2
Column 1
Reference or Instruction
Malfunction Indication
Test Procedure
a. Go to Test 1, para 4-12
a. POWER switch trips off . . . . . . . . . . . .
(1) W i t h power c a b l e connected to
b. Go to Test 2, para 4-12
b. POWER ON lamp does not light. . . . . .
b a t t e r y charger ( p a r a 3-10), set
POWER switch to ON. POWER ON
lamp should light.
Indicates a current flow.
(2) Set CHANNEL SELECT switch to 1.
a. Replace CB1
a. Voltage at S3-TP1 (fig. 3-3) is less than
Set VOLTAGE TEST SELECT
0.5 VDC.
switch to B1. Check panel meter
b. Replace S5
reading.
All -TP4 every time POWER switch is
turned on and voltage at TB1-E8 is less
than 1.0 VDC.
c. F i n d o p e n
b e t w e e n XA12-32 and
XA11-10
at A11-TP4 but is present at A12 pin 32
every time POWER switch is turned
ON.
d. F i n d o p e n
b e t w e e n XA11-16 and
XA12-41
at A12 pin 32 and voltage at A12-TP2 is
less than 7 VDC.
a. L e s s than 700 mA and voltage at
(3) P r e s s V O L T A G E T E S T s w i t c h .
TB1-E7 is greater than 7 VDC.
Check panel meter reading.
b. Go to Test 4,
b. No reading.
Replace
Meter needle pegs at one or more positions
TIME
(4) T u r n
SET CHARGE
of CHANNEL SELECT switch.
R5 if CH.1 pegs
meter
thumbwheels to 10.0. Press START
R6 if CH.2 pegs
meter
TIME switch. Turn CHANNEL
R7 if CH.3 pegs
meter
SELECT switch through all 5 posi-
R8 if CH.4 pegs
meter
tions and observe panel meter.
R9 if CH.5 pegs
meter
a. No display digits are blank but at least
(5) T u r n
SET
TIME
CHARGE
one digit is reading incorrectly.
thumbwheels to 18.8. Press START
TIME switch. Check CHARGE TIME
(1) Find faulty P1, XA12, A13 or faulty
( 1 ) Don't have continuity between
wiring of P1.
every pin of fault display socket and
HOURS REMAINING.
appropriate pin on A12 (table 3-4).
(2) Voltage is less than 9 VDC on any of
(2) Go to Test 5, para 4-12.
following pins of A12: Pins 1, 27 or
28.
(3) Voltage is greater than 1 VDC on
(3) Go to Test 5, para 4-12.
any of following pins of A12: Pins 2,
3, 4, 13, 22, or 26.
b. All display digits are blank and panel
meter is reading a current flow.
(1) Voltage at A12-TP2 is less than 7
(1) Find open between XA11-16 and
VDC.
XA12-41
(2) Voltage at TB1-E19 is less than 7
(2) Find open between XA12-39 and
VDC.
S3C-C
c. All display digits are blank, there is no
indication on the panel meter and F6 is
good.
(1) AC voltage between pins 22 and 23
(1) Go to Test 6, para 4-12
of All is less than 7 VAC.
(2) Voltage at pin 41 of A12 is less than
(2) Find open between XA11-16 and
7 VDC.
XA12-41
(3) Voltage at pin 41 of A12 is greater
(3) Replace S2
than 7 VDC.
d. All display digits are blank, there is no
indication on panel meter and F6 is
bad.
(1) With POWER switch OFF, resist-
(1) Find low resistance to ground at
ance between XA11-14 and C1 () is
XA11-14, XA11-16, XA12-40, or
less than 20 Ω.
XA12-41
(2) Resistance between XA11-14 and
(2) Find low resistance to ground at
C1 () is greater than 20 Ω.
XA11-18, XA6-22, XA7-22, XA8-22,
XA9-22 or XA10-22
4-5
