ACP MenuMaster RFS Subway, Service Training Manual

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25
Troubleshooting
Trouble 1: The following visual conditions indicate a probable failed control circuit.
1. Incomplete segments.
• Segment missing.
• Partial segment missing.
• Digit flickering (Note: Slight flickering is normal.)
2. Colon does not turn on or blink.
3. A distinct change in the brightness of one or more numbers in display.
4. One or more digits in the display are not lighting.
5. Display indicates a number dif ferent from one touched, for example, key in 5 and 3 appears in the displa y.
6. Specific numbers (for example 7 or 9) will not display when key pad is touched.
7. Display does not count down with time blinking or up with clock operation.
8. Display obviously jumps in time while counting down.
9. Display counts down too fast while cooking.
10. Each indicator light does not turn on after setting cooking cycle.
11. Display time of day does not reappear when cooking is finished.
CONDITION CHECK RESULT CAUSE REMEDY
Everything works
Continuity.
No continuity.
Still have trouble.
Defective key
membrane
assembly.
Defective PCB
assembly.
Loose
connection.
Defective PCB
assembly.
Replace key
membrane
assembly.
Replace PCB
assembly.
Connect them
tightly.
Replace PCB
assembly.
Replace key
membrane
assembly and
check operation.
Check the conn-
ection between
membrane key
assembly and
PCB assembly.
2. Some inputs
cannot be
programmed.
1. No input can be
programmed.
3. Display shows a
num e
e
touched.
4. Random
programming
when touching
other pads.
and can not
accept any
input.