Ricoh B234 - Turn on the main power switch.

SERVICE CALL CONDITIONS
SM 4-113 B234/B235/B236/D101/D102/D103
Trouble-
shooting
Output Module
The PSU output module is provided with the following interrupt devices:
• Control system electronic interrupt: 5.1V, 12V
• Drive system electronic interrupt: 24V, 38V
The output fuses of previous models have been replaced by electronic interrupt
circuits. These electronic interrupt circuits hav protect the machine from excessive
current, excessive voltages, and overheating.
• Excessive current can be caused by a short at the power supply.
• Excessive voltage can be caused by damage to the PSU board, short circuits in
external harnesses, or an unexpected surge in the external power supply.
• Overheating occurs when the temperature level of the elements in the control
circuits of the converters becomes too high due to the failure of the PSU cooling
fan, for example.
Table 4 shows how the electronic interrupt circuits react to these three problems.
Table 4: Electronic Interrupt Detection Locations
Converter Output
Name
Over
Current
Over
Voltage
Over
Heating
VccE O O O Energy Save
VcaE O O O
VccL O O 1st
Vcc O O
Vaa1 O O O
Vaa2 O O O
2nd
Vaa3 O O O
Vaa4 O O O 3rd
Vaa5 O O O
Vmm1 O O O 4th
Vmm2 O O O
Important!
To reset the machine after a protection circuit has opened:
1. Switch off the operation switch.
2. Switch off the main power switch.
3. Allow the machine to remain off for at least 5 minutes.
4. Turn on the main power switch.