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M - 19
Poor Output from High-voltage Power Supply
Possible cause Step
Hi&volta@
1
rontart
I
tigh-vottag?
powrr supply
PCH
I2
DC ronlmllrr
PCB
Connertor
PCB
M - 20
Faulty Exhaust Fan
step
Posstble
~'aw%'
i
Connertor
Exhaust fan
DC conlrotler
PCB
i
1 M - 21
Laser Malfunction
/
1
Possible cause
Step
DC controller
Check
Is any terminal of the high-voltage
ronnertor dirty or rarbontzed?
Does the problem improve when the
high-voltage power supply PCB is
replaced?
Check
Is ronnector
J209 on the DC controller
PCB making good contact?
,
~~~~~~~
D&ouch connector 5211 on the DC
rolltroller PCB.
Immediately after the power is turned
ON, does the volta@z between
I
ronncrlors J209-I .(FAND) and 5209.3
(GND] on the DC controller PCB
change from 0 V to about 24.5 VDC.
I6
then to aboul
VDC?
/
1
Check
Result
Procedure
YES
Clean the terminals of the
high-voltage
contact.
YES
Replace the high-voltage
power supply PCB.
Replare ihe DC controller
NO
PCB. If the problem persists
after replacing the PCB.
replace the connector PCB.
Procedure
Reattach the connector.
~~----
Replace the exhaust fan.
Replace the DC controller
1 Kesult 1
Procedure
~ ~~ ~ C h e c k b y u s i n g t h e l a s e r
malfunction
diagnostic
flowchart in Section III C.
CHAPTER 6
----
6 - 39
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