Specifications

6.12 50 ERROR
6.12 50 ERROR
Explanation: This error message appears when the fusing temperature is too
high, low, or fails to warm up fast enough. See Section 2.1.4 for a description
of the fusing circuit.
Any malfunction of the fusing control, safety, or temperature regulation circuits
can cause this error message.
Signal diagram reference: See figures 2–4 and 2–7 for schematics and
Figures 6–2 and 6–5 for wiring diagrams.
Action: A power off time of more than ten minutes is required to clear
this message. There are no test points for measuring fusing heater voltage.
The glow from the fusing lamp can be seen by removing the left-side cover as
shown in Section 9.18.
1. Make sure the fusing unit is properly installed.
2. Remove and inspect the fusing unit.
3. If you see any damage, replace the fusing unit.
4. Do the following to measure the resistance of thermistor TH1 and the
fusing heater element. Skip this step if you do not have a volt-ohm-
milliamp (VOM) meter.
a. Connect the VOM leads across pins 1 and 2 of the fusing unit
connector, shown in Figure 2–7. If the resistance reading is outside of
the following parameters, replace the fusing unit:
• Room temperature resistance is approximately 239K .
• Operating temperature resistance is less than 2.0K .
b. Connect the VOM leads across pins 3 and 4 of the fusing unit
connector. Normal resistance range for a 115 volt fusing heater is
between 2 and 3 . If the resistance reads open or shorted replace the
fusing unit.
c. Connect a VOM lead to the metal foot of the fusing unit. Touch the
other first to pin 3 then to pin 4. If the VOM shows continuity, replace
the fusing unit.
5. Make sure connectors C210 and C212 on the DC control board are properly
connected.
6. Make sure the fusing unit in the printer is the correct part number for the
line voltage.
6–16 Power and Control Panel FIPs