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Diagnostic Information 2-47
5016-001
B 922 Fuser Error displays.
FRU Action
1Interlock
Switch
Mechanism
Check the interlock switch actuator hardware for
proper operation making sure of the following:
• Actuator 1 activates door switch S2.
• There is +5 V dc to interlock switches S3 and S4.
If the mechanism does not operate properly or
activate any of the switches, repair as necessary.
2Interlock
Switch S2
Switch S2 has two functions. Two terminals control
+24 V dc to the engine board and four terminals
control AC line voltage to the fuser lamps. Terminal
A1, B1, A2 and B2 control AC line voltage to the
fuser lamps. When this circuit opens, a 922 service
error displays.
CAUTION: Be careful when checking the voltages
on switch S2, as AC line voltage may be present on
terminals A1 (brown) B1 (yellow), A2 (brown) or B2
(yellow).
Check the voltage between terminals A1 (brown)
and B1 (yellow). The voltage should read the same
as the AC line voltage.
Note: The lamp voltage varies as the fuser lamp
turns on and off, or when power saver is selected.
• If incorrect, go to the “Printhead Service Check”
on page 2-77.
• If correct, check, the voltage across terminals A2
(brown) and B2 (yellow). The voltage should read
the same as the AC line voltage.
• If incorrect, check the switch for continuity and
proper operation.
• If correct, disconnect the power cord and check
continuity between switch terminals A2 and B2.
• If incorrect go to the “Fuser Cold Service
Check” on page 2-51.