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Page 10 P/N 20-07121-00 Rev. C
6.0 TROUBLESHOOTING
THEORY OF
OPERATION
MECHANICAL
INSTALLATION
ELECTRICAL
INSTALLATION
PROGRAMMING
USER MODE
OPERATION
TROUBLESHOOTING
SPARE PARTS
LISTING
MAINTENANCE &
SPECIFICATIONS
INDEX
Dead Unit (No Display) Troubleshooting
1. Verify Main Power (between 90 VAC and 249 VAC, 50/60 Hz) is present on Main Power Cable (or
Terminals) and Power Switch (located behind cover in upper left corner) is On.
Yes? Go to step 2.
No? Restore Main Power source.
2. With a volt meter capable of reading AC voltages between 90VAC and 249 VAC, and DC voltages
around 20 VDC to 30 VDC, perform the following measurements on the Power Supply PCB:
Power Supply Input
(Brown and Blue wires)
Power Supply Output
(Black and Red wires)
90-240 VAC,
Yes: Measure Output
No: Go to 2a
AC Volts
+ DC Volts -
26-28 VDC?
Yes: Replace Logic PCB
No: Replace Power Supply
2.a Recheck Main Power source, if Main Power present, replace Logic PCB.
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