1-8-3 E7B71TR
Ye s
Ye s
Ye s
Ye s
No
No
No
No
FLOW CHART NO.15
The fluorescent display tube does not light up.
Is 3.3V voltage supplied to Pin(6, 24) of IC1503?
Is approximately -24V to -28V voltage supplied to
Pin(15) of IC1503?
Is there approximately 500kHz oscillation to
Pin(26) of IC1503?
Are the filament voltage applied between (1)
and (24) of the fluorescent display tube?
Also negative voltage applied between these pins
and GND?
Replace the fluorescent display tube.
Check the EV+3.3V line and service it if defective.
Check the -FL line and service it if defective.
Check R1560, IC1503 and their periphery, and
service it if defective.
Check the power circuit, D1101, D1112, C1106
and their periphery, and service it if defective.
No
Ye s
Check D1108, L1101, C1114, C1116 and their
periphery, and service it if defective.
FLOW CHART NO.14
P-ON+3.3V is not outputted.
Is 5V voltage supplied to Pin(1) of IC1152?
Replace IC1152.
No
Is 4V voltage supplied to Pin(1) of IC1151?
FLOW CHART NO.13
P-ON+2.5V is not outputted.
Replace IC1151.
Check D1105, C1110 and their periphery, and
service it if defective.
Ye s
EV+3.3V is not outputted.
FLOW CHART NO.12
Is 5V voltage supplied to the collector of Q1159?
No
Ye s
Is the voltage of approximately 4V supplied to
the base of Q1159?
Check D1108, L1105, C1120 and their periphery,
and service it if defective.
No
Check IC1153 and their periphery, and service it if
defective.
Replace Q1159.
Ye s
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