Chapter Three – Troubleshooting Guides
65
3.19 NIGHT LIGHT TROUBLESHOOTING GUIDE
NOTE
Before replacing any circuit boards, ensure applicable cables and connections are intact (visually and me-
chanically). When measuring 110 VAC at any point, use only the neutral (white) side of the power line as a
reference point. DO NOT use digital ground as a reference point when measuring 110 VAC.
PROBLEM/SYMPTOM
SOLUTION(S)
Night Light does not light, either bright or dim,
when switched on.
A. Remove unlit lamp(s). Check continuity of
lamps with multimeter. If lamp(s) appear to be
O.K., replace lamp(s) in socket(s). Replace defec-
tive lamps as necessary.
B. If lamp(s) appear to be O.K., use a voltmeter to
check night light board (p/n 3000–310–937) at
connector P1 for the following voltages, using pin
1 as a reference:
pin 2 12 VAC
pin 3 24 VAC
(See page 199 for board location).
If voltages are not present, check fuse F3 and re-
place, if necessary. If fuse is O.K., check connec-
tor J1 for 110 VAC, pin 1 neutral and pin 2 hot. If
voltage is present at connector J1, fuse F3 is not
O.K. and output voltages are not present at con-
nector P1, replace night light board.
C. If 110 VAC is not present at connector J1,
check the following boards and connections for
110 VAC path:
1.) DMS power supply (p/n 3000–302–939) – JP2,
pin 1 neutral, pin 2 hot
2.) DMS power supply (p/n 3000–302–939) – JP1,
pin 1 neutral, pin 2 hot
3.) scale power supply (p/n 3000–307–953) – J2,
pin 1 neutral, pin 2 hot
4.) scale power supply (p/n 3000–307–953) – J1,
pin 1 neutral, pin 2 hot
5.) litter CPU board (p/n 3000–300–941) – J3, pin
1 neutral, pin 2 hot
6.) litter CPU board (p/n 3000–300–941) – P1,
pin 1 neutral, pin 2 hot
7.) power junction board (p/n 3000–300–961) –
P1, pin 9 neutral, pin 8 hot, fuse F2
8.) power junction board (p/n 3000–300–961) – J1,
pin 1 neutral, pin 2 hot.
(See page 199 for board locations).
Replace boards as necessary.
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