Specifications

2.1 Print Engine Control
2.1.5 Fusing Malfunction
If a fusing malfunction occurs, dynamic and passive safety circuits disable the
fusing heater current.
The safety circuit opens RL101 and disconnects the fusing current if the:
• Fusing temperature fails to reach 172°C (341.6°F) within 200 seconds of
power on, the DC control board asserts .
• Fusing temperature rises above the maximum high temperature
• Fusing temperature falls below the minimum low temperature.
• A short circuit occurs in the fusing heater or leads. The LVPSA senses the
increased current and forces the safety circuit to open RL101.
If an uncontrollable temperature rise occurs, the thermoswitch (TP1) opens to
permanently disconnect the fusing current.
When a fusing error occurs, C202 is charged to approximately +5 Vdc,
which prevents the operation of the fusing circuit. C202 discharges only
when the power is turned off. If power is turned on before the charge is
completely drained, C202 fully recharges. The printer must remain off for
approximately 10 minutes.
Caution: If you do the following, be sure to power off the printer and disconnect
the power cord. For service reasons only, C202 can be discharged by touching
the lead of C202 to the metal chassis ground frame. Failure to power off the
printer can damage the DC control board.
Figure 2–6 Discharging C202
J201
J212
J203
J204 J205
J206
J207
J208
J209
TB201 J211
C201 C202
J210
VR202
DSG-000598
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2–10 Technical Description