User Guide

NOTE It is important to have the printer control panel functional as soon as possible in the
troubleshooting process so that the control-panel display can be used to help locate printer
errors.
If problems with the power-on check perisist refer to table Table 7-2 Power-on defect or blank display.
Table 7-2 Power-on defect or blank display
Problem Action
The power cord is not plugged into the
wall receptacle and connected to the
printer.
Make sure that the power cord is firmly plugged into the wall receptacle and
connected to the printer.
The correct voltage (power) is not
available.
Measure the voltage at the outlet. If necessary, plug the power cord into another
circuit outlet.
The power switch is off. Set the switch to the on position. You should hear the switch toggle. If the front
right-side cover has been removed recently, make sure that the rod connecting
the power-supply switch moves as you toggle the switch. See the reinstall note in
Right-side cover.
If the printer still does not turn on, the power switch might be defective.
1 Remove the power supply.
2 Measure the resistance between the two terminals of the power switch (SW1)
by applying the tester probes to the terminals. The resistance must be low
(under 1 KW) when the power is turned on, and high (over 6 MW) when the
switch is turned off.
3 Replace the power-supply assembly, if necessary.
The overcurrent/overvoltage detection
circuit is activated.
Wait for more than two minutes before turning the printer back on.
A fuse is blown. 1 Check the fuses (FU1 and FU2) on the power supply.
2 Replace the power-supply assembly if necessary.
The main cooling fan (located on the
left side of the printer) does not turn on
when the printer is started.
An operational fan indicates the following conditions:
■ The ac power is present in the printer.
■ The dc power supply is functional (24 V, 5 V, and 3.3 V are being generated).
■ The dc controller's microprocessor is functional.
If the fan is not working:
1 Turn the printer off and remove the formatter. Disconnect the optional
accessories.
2 Turn the printer on and check the fan again.
If the fan is still not working:
1 Verify that the fan is connected to the power supply.
2 Replace the fan. See
Main cooling fan (left side).
Troubleshooting process 307