Xerox 2135DX - Phaser Color Laser Printer, Service Manual

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34 Phaser 2135 Color Printer
Inspecting the low-voltage power supply fuse
The 115 VAC power supply features a 20 A fuse. The 220 VAC power supply fuse
uses a 15 A fuse.
1. Turn off the printer.
2. Disconnect the power cord from the printer.
3.
Remove the front cover as described in “Front cover” on page 90.
4.
Remove the AC power switch (1 screw) and the front power supply fan as
described in “Front power supply fan” on page 95. The fuse is now
accessible.
If the fuse is good, but the printer's power supply does not output DC voltages,
replace the low-voltage power supply. Check the +% v loop circuit as described
earlier in “Ensuring the +5 VDC loop is complete” on page 35.
Safety interlocks
The printer features two safety interlock switches:
■ Top door-opened switch.
■
Right door-opened switch.
When the top cover switch is opened, the +32 VDC supply to the motors is shut
down, as well as the high-voltage power supply and an error message is
displayed on the front panel. When the right cover door is opened, the +32 VDC
supply to the duplex unit and high-voltage power supply is disabled.
1. Turn off the printer.
2. With a DMM set to measure resistance, test each switch when it is opened
and closed.
3. Inspect each switch’s wiring harness for pinches, nicks or open connections.
If you find a switch that is defective, replace it. If no motors appear to be at fault,
replace the engine controller board.