Xerox Nuvera 100, Руководство по обслуживанию

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Troubleshooting 3-7
3. With a DMM, determine that the fuses on the power supply are
functional. Fuse F1 is the AC input fuse for the DC section of
the power supply. If F1 opens, the power supply does not
function and should be replaced.
CAUTION
Fuse F2 and Fuse F3 are used for the AC heaters within the printer;
they protect the power supply from, most often, a shorted triac. If
F2 or F3 blows, it is best to replace the power supply rather than the
fuse. Otherwise, with the fuse replaced, but the triac shorted, AC
power may be applied to the heater without the printer being turned
on, resulting in a thermal runaway condition.
If the fuses are functional, but the printer’s power supply does not
output DC voltages, proceed to the topic, “Testing for shorted drivers.”
Testing for Shorted Drivers
1. Turn off the printer.
2. Disconnect the +40 DC loopback connector (the 4-pin connector
with the two loopback wires) from J250 at the top of the power
control board. (This isolates the Y-axis motor, process motor, X-
axis motor, paper feed motor, vacuum pump, solenoids and
clutches).
3. Attach the service load connector to J250 on the top of the
power control board, behind the printhead, to simulate a load
on the power supply. When viewed from the front of the printer,
the lead with the ground clip should be to the right. See Figure
3-10 for correct orientation. Attach the service load connector’s
ground clip to the printer frame. Do not leave the service load
connector in place and powered-up for longer than 5 minutes; it
gets hot from the current load.