Canon ImageRunner iR8500 Series, Руководство по обслуживанию, Страница: 734 / 1122

Chapter 15
15-6
There are several cases in the field where paper dust caused this problem. So, try using Canon genuine paper in order to identify the cause.
15.2.2.3.4 Soiling at back of paper/Jam at fixing unit: because fixing lower roller shaft is scraped
0002-6416
iR8500 / iR7200 / iR105 / iR85
Case in the field
Symptom
Soiling at back of paper/Jam at fixing unit: because fixing lower roller shaft is scraped
Explanation
Because of the shaft of the fixing lower roller being scraped, the roller will apply a smaller amount of pressure, causing fuser offset or a jam.
Field Remedy
Inspect the fixing lower roller for any indication of scrape. If there is, replace the fixing lower roller and the bearing. Additionally, make sure that there
is no abnormality with the plates at the fixing unit side which is supporting the bearing.
15.2.3 Malfunction
15.2.3.1 No Power
15.2.3.1.1 No power: main power indicator lighting up but LCD on the control panel not turning ON
0002-1865
iR8500 / iR7200 / iR105 / iR85
Symptom
No power: main power indicator lighting up but LCD on the control panel not turning ON
Cause
As a result of inspection, the following are found:
- Main controller PCB is faulty.
- HDD is faulty.
This symptom can also occur by the following reasons:
- Contact failure of Boot ROM
- Contact failure of SDRAM and faulty SDRAM
- Contact failure of connectors on main controller PCB
- Faulty DC power supply PCB
- Faulty LCD control panel unit
Field Remedy
1. Remove the Boot ROM and SDRAM, and clean the contacts of both devices and slots on the main controller PCB with a blower brush. There
occurred several cases in the field.
2. Check the connectors J1012 and J1018on the main controller PCB, which are connecting to the control panel, are securely connected. There
occurred several cases in the field.
3. Measure DC output on the DC power supply PCB. If there are any problems with output, replace the PCB with a new one.
4. Replace the main controller PCB with a new one.
5. Replace the HDD with a new one.
6. Replace the LCD control panel unit with a new one.
15.2.3.1.2 No power: due to faulty all-night power supply PCB
0003-1608
iR8500 / iR7200 / iR105 / iR85
[ Inspected by Canon Inc. ]
Cause
As a result of inspection, the all-night power supply PCB was found to be faulty.
Field Remedy
The following are procedures for checking the all-night power supply PCB:
(The measurement points are all the connectors on the all-night power supply PCB. Voltages below are actually-measured values by a digital tester.)
1) Between J781-1 and J781-3: AC input approx. 100V Åi208V)
J783-1: DC output approx. 9V
J783-3: DC output approx. 3.3V
J783-4: DC output approx. 3.3V
If an anomaly is found in DC output, replace the PCB with a new one.
2Åj J785-2 RMT_1 signal: DC approx. 3.3V
Between J782-ÇP and J782-6: AC input approx. 100V Åi208V)Åj
Between J782-2 and J782-5: AC input approx. 100V Åi208V)Åj
If RMT_1 signal can be confirmed and there is no AC input, replace the PCB with a new one.
3Åj J785-3 RMT_2 signal: DC output approx. 1.3V
J784-1: DC output approx. 5V
J784-2: DC output approx. 3.3V
If RMT_2 signal can be confirmed and there is no DC output at J784-1 and J784-2, replace the PCB with a new one.
All-night power supply PCB part number:
- FG6-7267 for iR8500/7200 100V
- FG6-7268 for iR105/8500/7200 208/220/240V
15.2.3.2 Malfunction/Faulty Detection
15.2.3.2.1 Locking up/Unable to boot up: Machine locking up at startup with 'Start up. Please wait.' message
0002-2827
iR8500 / iR7200 / iR105 / iR85