4-16 Phaser 4500/4510 Service Manual
General Troubleshooting
3 Check the Fuser power source voltage:
1.Disconnect P/J48 from the LVPS.
2.Remove the print cartridge.
3.Turn the power ON.
4.Measure the voltage across P/J48-1 <=>
P/J48-3
Does it measure at line voltage?
Go to step 5. Go to step 4.
4 Check the AC line voltage.
Is the AC line voltage correct?
Replace the
AC power
harness
assembly
(RRP12.4)
Inform the
customer or
the
electrician.
5 Check the Heater Rod ON signal voltages:
Warning: Allow the fuser assembly to cool
down before beginning.
1.Make sure that the print cartridge is
removed.
2.Measure the voltage across P/J41-13 <=>
P/J41-3 (/HEAT ON (Short)), and
P/J41-12 <=> P/J41-3 (/HEAT ON
(Long)).
Does the voltage measure 0 VDC when the
heater turns on, and 3.3 VDC when the
heater turns off?
Go to step 7. Go to step 6.
6 Check the LVPS harness assembly for
continuity:
1.Disconnect P/J11 from the HVPS/engine
logic board.
2.Measure the following for continuity?
■ P/J41-1 <=> P/J11-16
■ P/J41-9 <=> P/J11-8
■ P/J41-10 <=> P/J11-7
■ P/J41-12 <=> P/J11-5
■ P/J41-13 <=> P/J11-4
Do they all exhibit continuity?
Replace the
HVPS/engine
logic board
(page 8-73),
then go to
step 8.
Replace the
LVPS harness
assembly.
7 Check the resistance of the Thermistor in
the Temperature Sensor:
1.Disconnect P/J46 from the LVPS.
2.Measure the resistance between
P/J46-6 <=> P/J46-7 and P/J46-1 <=> P/
J46-2.
Is the resistance about 480 k-ohm at
normal temperature (about 20° C)?
Replace the
HVPS/engine
logic board
(page 8-73),
then go to
step 8.
Replace the
fuser
assembly
(page 8-44).
8 Does the problem still occur after
replacement?
Go to step 9. Problem
solved.
Troubleshooting Procedure (continued)
Steps Actions and Questions Yes No
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