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A
B
Y
N
Check that the F1 fuse on the IOT PWB has not failed. Go to 01H +24 Volt Cir-
cuits before a new IOT PWB is installed, PL 1.10 Item 2.
Install a new LVPS and base module, PL 1.10 Item 3.
Disconnect the power cord. Disconnect the in-line fuse in the harness from PJ17. Recon-
nect PJ16 and PJ17. Set the service multi-meter to measure amps. Ensure the meter
leads are connected to the correct meter sockets to measure amps. Clip the black lead to
the machine frame. Reconnect the power cord. Use the probe on the red lead to ground
PJ26, pin 7 to ground. When the LEDs CR27, CR28 and CR29 are flashing, press and
release the on/off switch and remove the probe. The LEDs, CR12, CR13, CR15 and
CR16 are ON and stay ON
Y
N
Check the interlock circuit, Flag 1, Flag 2 and Flag 6. If the circuit is good, check that
F1 fuse on the IOT PWB has not failed. Go to 01H +24 Volt Circuits before a new
IOT PWB is installed, PL 1.10 Item 2.
The LVPS is good. Continue at 01H Initial Isolation Check.
Disconnect the power cord. Reconnect PJ16 and PJ17. Connect the power cord. Press the on/
off switch. The LED CR16 is ON.
Y
N
Check the interlock circuit, Flag 1, Flag 2 and Flag 6. If the circuit is good, go to 01H +24
Volt Circuits before a new a new IOT PWB is installed, PL 1.10 Item 2.
The LVPS is good. Continue at 01H Initial Isolation Check.
01H Initial Isolation Check
NOTE: After every disconnection, the on/off switch, PL 1.10 Item 8, must be pressed. If CR12
and CR13 are not on, reconnect and go to the next step.
Disconnect the power cord. Reconnect all the disconnected PJ connections on the IOT PWB,
LVPS and the power distribution PWB. Reconnect the power cord. Switch on the machine, GP
14. If ALL the LEDs, Figure 1, CR12, CR13, CR15 and CR16 are OFF, go to step1. If the CR15
is OFF, go to 01H +12 Volt Circuits. If the CR16 is OFF, go to 01H +24 Volt Circuits.
1.
Disconnect PJ25, Flag 5, Figure 3. If the LEDs CR12 and CR13 are on, check the har-
ness from PJ25 to PJ131. If the harness is good, go 01H +3.3 Volt and +5 Volt Circuits.
2.
Disconnect PJ18, Flag 3, Figure 3. If the LEDs CR12 and CR13 are on, check the har-
ness, Flag 3, from PJ18 to the ROS, PL 6.10 Item 4. WD 1.
3.
Disconnect PJ19, Flag 4, Figure 3. If the LEDs CR12 and CR13 are on, check the har-
ness, Flag 4, from PJ19 on the LVPS, to the Tray 1 and 2 Control PWB, PL 7.10, WD 1.
a.
Check the harness at Flag 7, WD12.
b.
Check the harness, Flag 4, from PJ19 on the LVPS, to the Tray 1 and 2 Control
PWB, PL 7.10 Item 2, WD1.
4.
Disconnect PJ10, Flag 20, Figure 3. If the LEDs CR12 and CR13 are on, check the har-
ness, Flag 20, from PJ10 on the IOT PWB, to the bypass tray, PL 7.30, WD 6.
5.
Disconnect PJ11, Flag 21, Figure 3. If the LEDs CR12 and CR13 are on, check the har-
ness, Flag 21, from PJ11 on the IOT PWB to the output devices, WD 3.
6.
Disconnect PJ7, Flag 19, Figure 3. If the LEDs CR12 and CR13 are on, check the har-
ness, Flag 19, from PJ7 to the components that follow:
Status Indicator RAPs
01H
a.
Developer temperature sensor, (32-38 ppm)PL 9.22 Item 5, (45-87 ppm) PL 9.20
Item 5, WD 6.
b.
Relative humidity sensor, (32-38 ppm) PL 9.22 Item 4, (45-87 ppm) PL 9.20 Item 4,
WD 6.
c.
Ambient temperature sensor, (32-38 ppm) PL 9.22 Item 4, (45-87 ppm) PL 9.20 Item
4, WD 6.
d.
Waste toner full sensor, PL 9.10 Item 2, WD 6.
01H +3.3 Volt and +5 Volt Circuits
NOTE: After every disconnection, the on / off switch, PL 1.10 Item 8, must be pressed. If CR12
and CR13 are not on, reconnect and go to the next step.
1.
Perform the steps that follow:
a.
Disconnect PJ137, power distribution PWB. If the LEDs CR12 and CR13 are on,
then check the harness, Flag 11, from the power distribution PWB to PJ106 on the
image processing PWB, WD 10.
b.
Disconnect PJ138 from the power distribution PWB. If the LEDs, CR12 and CR13
are on, then check the harness, Flag 12, to the riser PWB, WD 10.
2.
If no short circuit is found is found in the +3.3V and +5V circuits, go to 01H +3.3 Volt Cir-
cuits.
01H +3.3 Volt Circuits
NOTE: After every disconnection, the on / off switch, PL 1.10 Item 8, must be pressed. If CR12
and CR13 are not on, reconnect and go to the next step.
1.
Disconnect PJ132, power distribution PWB. If the LEDs, CR12 and CR13 are on, then
check the harness, Flag 8, to the DADH, WD 10.
2.
Disconnect PJ133, power distribution PWB. If the LEDs, CR12 and CR13 are on, then
check the harness, Flag 9, to the UI PWB, WD 10.
3.
Disconnect PJ135, power distribution PWB. If the LEDs, CR12 and CR13 are on, then
check the harness, Flag 10, to the scanner PWB, WD 10.
4.
If no failure is found in the +3.3V circuits, go to 01H +5 Volt Circuits.
01H +5 Volt Circuits
NOTE: After every disconnection, the on / off switch, PL 1.10 Item 8, must be pressed. If CR12
and CR13 are not on, reconnect and go to the next step.
1.
Disconnect PJ8, IOT PWB. If the LEDs CR12 and CR13 are on, then check the harness,
Flag 14, to the xerographic CRUM, part of the xerographic module, (32-38 ppm) PL 9.22
Item 2 or (45-87 ppm) PL 9.20 Item 2, and to the fuser CRUM, part of the fuser module,
(32-55 ppm) PL 10.8 or (65-87 ppm) PL 10.10 Item 1, WD 4.
2.
Disconnect PJ9, IOT PWB. If the LEDs CR12 and CR13 are on, then check the harness,
Flag 17, to tray 1 and 2 control PWB, PL 7.10 Item 1, WD 6.
3.
Disconnect PJ4, IOT PWB. If the LEDs CR12 and CR13 are on, then check the harness,
Flag 16, to the inverter motor driver PWB, PL 10.11 Item 22, and to the duplex motor
driver PWB, (32-55 ppm) PL 8.22 Item 9, (65-87 ppm) PL 8.20 Item 9, WD 5.
August 2007
2-52
WorkCentre 5687 Family
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