Xerox Phaser 4500, Service Manual

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3-30 Phaser 4500 Service Manual
8 Turn the power ON.
Does fan error occur? Replace the
HVPS/Engine
Logic Board
(page 8-89).
Problem solved.
9 Measure the voltage across P/J27-19 <=>
P/J27-18.
Does the voltage measure 24 VDC? (12
VDC when low-speed) Go to step 10. Replace the
LVPS (page 8-78)
then go to step 8.
10 Measure the voltage across P/J27-18 <=>
P/J27-17.
Does the voltage measure 0.82 VDC or
higher? Go to step 11. Replace the
HVPS/Engine
Logic Board
(page 8-89).
11 Replace the Sub Fan (page 8-44)
Does the fan error occur when the power
is turned ON? Go to step 12. Problem solved.
12 Replace the LVPS.
Does the fan error occur when the power
is turned ON? Replace the
HVPS/Engine
Logic Board
(page 8-89).
Problem solved.
Troubleshooting Procedure (Continued)
Steps Actions and Questions Yes No