• All Test Lights on LPB should be SOLID GREEN. (under normal operation)
• If any LED lights are DIMMED or ABSENT on LPB, disconnect P13 and
P14 from LPB to gain access to the test points
•Use Ground TP-4(GND) to check voltage at test points TP-1 (+15VDC),TP-2
(+5VDC) and TP-3 (-15VDC)
•If voltage not present, test voltage at TP8 for 24VAC and TP18 for 12VAC
which comes from Transformer
•If voltage is present, replace LPB
•If voltage is not present, replace Transformer
48
Troubleshooting LPB
Ground L2 L1
Lower power board
TP18
TP 8
12VAC
24VAC
TP 1
5VDC
TP 2
15VDC
TP 3
TP 4
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