Mystery time.....
We have an MX-C402SC (same as in the title) that loses power as soon as the cover is closed. There is still the green light at the ops panel power switch, but we have to reset the main power switch to get it to come on again. The story starts like this: When duplexing color copies the machine would shut down. A technician went out and replaced the primary transfer belt. Seemed to work, but was soon called in again, but the problem had gotten a little worse. By the fourth call we got to the point where the machine just shut down as soon as the system began to turn. Here's a list of the guesses we have taken to this point:
1. Primary transfer belt
2. Fuser
3. Firmware (probably should have been first, but we got to it at least)
4. Main drive unit
5. HDD
6. Fuser drive unit
7. Controller
8. PCU pwb
9. Power Supply
10. Right door (took complete door assembly from functional machine)
11. Both high voltage boards (behind the power supply and mounted to bottom of toner holder assembly)
12. Motherboard
We have also completely exchanged the drum and developer units, disconnected the cassettes from the system, disconnected the DF.
The scanner does its thing normally...lights up and moves as it should.
If we keep a cover open we can get into test commands and check things individually. The only time we lose power is when we test the primary transfer belt.
We have used two different transfer belts.
When it powers down we are always left with the green light on the ops panel power switch, but that will not turn the machine back on.....we are forced to power the main switch off then on.
The machine is now in our office (thank whatever deity you choose) so we know it's not the customer's power.
The fax option has been removed while we troubleshoot. There is no data security kit, no finisher.
We were beginning to think swapping the serial number plate with our functional machine might be a good idea, but these things have a painful unibody construction.
Can anyone tell me what stupid, simple thing it is we've overlooked?
Thanks for any help,
Al
We have an MX-C402SC (same as in the title) that loses power as soon as the cover is closed. There is still the green light at the ops panel power switch, but we have to reset the main power switch to get it to come on again. The story starts like this: When duplexing color copies the machine would shut down. A technician went out and replaced the primary transfer belt. Seemed to work, but was soon called in again, but the problem had gotten a little worse. By the fourth call we got to the point where the machine just shut down as soon as the system began to turn. Here's a list of the guesses we have taken to this point:
1. Primary transfer belt
2. Fuser
3. Firmware (probably should have been first, but we got to it at least)
4. Main drive unit
5. HDD
6. Fuser drive unit
7. Controller
8. PCU pwb
9. Power Supply
10. Right door (took complete door assembly from functional machine)
11. Both high voltage boards (behind the power supply and mounted to bottom of toner holder assembly)
12. Motherboard
We have also completely exchanged the drum and developer units, disconnected the cassettes from the system, disconnected the DF.
The scanner does its thing normally...lights up and moves as it should.
If we keep a cover open we can get into test commands and check things individually. The only time we lose power is when we test the primary transfer belt.
We have used two different transfer belts.
When it powers down we are always left with the green light on the ops panel power switch, but that will not turn the machine back on.....we are forced to power the main switch off then on.
The machine is now in our office (thank whatever deity you choose) so we know it's not the customer's power.
The fax option has been removed while we troubleshoot. There is no data security kit, no finisher.
We were beginning to think swapping the serial number plate with our functional machine might be a good idea, but these things have a painful unibody construction.
Can anyone tell me what stupid, simple thing it is we've overlooked?
Thanks for any help,
Al
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