Service Manual
6-3
Troubleshooting
6
If the printer does not print a test pattern, then a problem exists with the
printer's image processor board or the print engine. Proceed with the topic
“Verifying print engine operation by using its self-test print” on the next page.
Verifying print engine operation by using its self-test print
1.
If not already on, turn on the printer. If the printer does not power up,
go to the topic “Verifying power supply operation” below.
2.
Once the READY light is on (not blinking), press and hold the
TEST
button for 5 seconds. The printer should print out a test pattern.
If the printer prints a test pattern, then the print engine is working correctly and
the printer's problem resides with its image processor board. Refer to the later
topic “Image processor self-diagnostics” on page 6-31.
If the printer does not print a test pattern, then a problem exists with the print
engine. Proceed with the topic “Verifying power supply operation” below.
Verifying power supply operation
Verifying the power supply involves four steps:
■
Measuring the input and output voltages
■
Inspecting the power supply fuses
■
Checking its +24 VDC safety interlocks
■
Testing for a shorted motor which would shut down the power supply
Measuring power supply voltages
1.
Turn off the printer and unplug it from its power outlet.
2.
AC Input:
With the VOM set to measure AC voltages, measure for
power being supplied to the printer. It should measure between 87 to
128 VAC (115 VAC nominal) or 174 to 250 VAC (220 VAC nominal).
Ensure that the switch is correctly set.
3.
Remove the left side cabinet panel to access the wiring harnesses
plugged into the print engine control board.
4.
Plug in the printer and turn it on.
Required tools
■
#1 POSIDRIV®
screwdriver
■
Volt-ohm-meter (VOM)