13. OTHERS PROBLEMS
■The machine is not turned on, or the LCD indication does not appear.
Step | Cause | Check | Result | Remedy |
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| Harness | Is the harness of the |
| Reconnect the LCD panel |
1 | connection | LCD panel PCB ASSY | No | PCB ASSY harness. |
failure of LCD | connected correctly? |
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| panel PCB |
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| LCD panel PCB | Is the problem solved |
| Replace the LCD panel |
2 | failure | after replacing the LCD | Yes | PCB ASSY. |
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| panel PCB ASSY? |
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| LCD panel failure | Is the problem solved |
| Replace the LCD panel |
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| after replacing the LCD | Yes | ASSY. |
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| panel ASSY? |
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| Is the problem solved |
| Replace the PS PCB unit. | |
4 | power supply | after replacing the PS | Yes |
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| failure | PCB unit? |
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| Main PCB | Is the problem solved |
| Replace the main PCB |
5 |
| after replacing the main | Yes | ASSY. |
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| PCB ASSY? |
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■The fan does not work.
(Verify the position of each fan referring to "4.19 Operational Check of Fans (Function code 78)" in Chapter 7.)
Step | Cause | Check | Result | Remedy | |
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| Harness | Is the harness of the |
| Reconnect the harness of | |
1 | connection | appropriate fan | No | the appropriate fan | |
failure of the | connected correctly? | correctly. | |||
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| appropriate fan |
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| Charge HVPS | Is the problem solved |
| Replace the charge HVPS | |
2 | PCB failure | after replacing the | Yes | PCB ASSY. Replace the | |
| charge HVPS PCB | fuser unit fan (FU) and air | |||
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| ASSY? |
| intake fan (AIR). | |
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| Is the problem solved |
| Replace the PS PCB unit. | ||
3 | power supply | after replacing the PS | Yes | Replace the LVPS fan | |
| failure | PCB unit? |
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| Main PCB | Is the problem solved |
| Replace the main PCB | |
4 |
| after replacing the main | Yes | ASSY. | |
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| PCB ASSY? |
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Confidential |