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PRINTED CIRCUIT BOARD
3) Display problems
NO.
CAUSE
Poor contact between
1
P.C.B. and display filament.
2
Defective Display.
Loss of vaccum in the dis-
3
play.
The display troubleshooting data
TROUBLE
STAGE 1, LOCK don' t come on.
STAGE 2, NO don' t come on.
WEIGHT DEFROST, CUPS don' t come on.
TIME DEFROST, OZ don' t come on.
AUTO START,lb don' t come on.
SEGMENT " a " doesn' t come on from G1 to G5.
SEGMENT " b " doesn' t come on from G1 to G5.
SEGMENT " c " doesn' t come on from G1 to G5.
SEGMENT " d " doesn' t come on from G1 to G5.
SEGMENT " e " doesn' t come on from G1 to G5.
SEGMENT " f " doesn' t come on from G1 to G5.
SEGMENT " g " doesn' t come on from G1 to G5.
LOCK,NO, CUPS, oz,lb don' t come on.
STAGE1,STAGE2, TIME DEFROST, WEIGHT
DEFROST, AUTO START don' t come on.
MEASUREMENT
Check the voltage of
PIN1&PIN25.
Refer to " The display trou-
ble shooting data" below.
White spot
DISPLAY NAME & PIN NO.
GRID 1 (G1),21
GRID 2 (G2), 17
GRID 3 (G3), 14
GRID 4 (G4), 10
GRID 5 (G5),4,7
SEGMENT d, 19
SEGMENT 2, 18
SEGMENT f, 16
SEGMENT a, 23
SEGMENT b, 22
SEGMENT c, 20
SEGMENT g, 15
UPPER BAR h, 5
LOWER BAR i,6,8,9,11
36
RESULT
2.4VAC
White spot is generated on
the display.
MICOM OUTPUT IN PIN NO.
REMEDY
Fix the PIN1&25.
Replace P.C.B. assembly.
Replace P.C.B. assembly.
30
29
26
28
27
39
40
41
36
37
38
42
33
34
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