Faulty Heater Rod - Star Micronics WinType 4000 Technical Manual

TROUBLESHOOTING

3.5 Faulty Heater Rod

Step
1 (Initial Check)
Are any parts broken, malformed, incorrectly installed
or different from those listed in the specifications?
• Principle Parts to be Checked:
(1) Fuser assembly, (2) MCU PWB
(3) LVPS assembly, (4) ROS assembly
2 (Check the heater rod in the fuser assembly.)
For 100V models:
For 220V models:
3 (Check the ON signal for the heater rod.) *1, *3
Is the voltage 0VDC between P/J11-3PIN↔P/J11-
7PIN with the interlock switch on, and is the voltage
4.35VDC when the interlock switch is in the off
position?
• Check that the fuser assembly does not become
hot.
4 (Check the heater rod in the fuser assembly.)
Is there continuity between the left end of the heater
rod and the J114-2PIN?
5 (Check the harness on the fuser assembly.)
Is there continuity between J112↔J114?
6 (Check the thermostat.)
Is the thermostat open?
*1: Do not touch the HVPS or any other high voltage components.
*2: If the procedure in section 2.3 U4 is followed and no other problems are detected, follow the procedure below:
If the thermostat opens again, replace the LVPS assembly and MCU PWB parts.
If the problem does not recur, the problem could have been caused by a malfunction in the fuser assembly before
it was changed or by a malfunction in the thermostat.
*3: Be sure the EP toner cartridge is installed and the front cover assembly is securely closed.
Check
Is there continuity between J114-
2PIN↔J114-3PIN?
Is there continuity between J114-
2PIN↔J114-3PIN?
– 134 –
Remedy
YES
Replace the part or
install the part
correctly.
See step 3.
See step 4.
See step 5.
Replace the fuser
assembly.
In order to determine
the reason for the
thermostat being
open, follow the
procedure in section
2.3 U4 after replacing
the fuser assembly. *2
NO
See step 2.
See step 6.
See section 3.6
Faulty Thermistor.
Replace the fuser
assembly.
Replace the fuser
harness assembly.
See step 7.