Power Supply - Oce 3121 Technical & Service Manual

3 Power supply

The machine's DC power is generated by the composite power supply PBA.
The composite power supply PBA serves as the DC power supply and also as
a lamp unit and a high-voltage transformer unit. The table is a block diagram
of the entire composite power supply PBA, and gives an outline of the DC
power supply.
Power supply PBA: output
Output voltage
24VR
24VU
+7V
+15V
–12V
5.1V
+5V
Power Supply :SLEEP mode
SLEEP mode = ON/OFF switch on the operating panel is OFF.
There are two possibilities:
SLEEP2 = economy mode, or
SLEEP1 = quick start mode.
Economy mode (SLEEP 2)
Power is supplied only to the CPU on the power supply PBA.
A separate facility is provided for the power required for the printer functions.
Fax reception is enabled.
When a transmission is received, the CI signal is generated in the NCU. The
CI signal is transmitted to the CPU on the power supply PBA, via the Fax
motherboard PBA. This switches on the power supply PBA, to supply power
to the other PBA.
The printer functions are not enabled.
Economy mode is disabled for printer mode. The same applies if the fax mode
is set to start at a specific time of the day.
520 TSM Océ 3121
Output voltage
24V±5%
24V±10%
8.75V±26%
15V±5%
–12V±5%
5.1V±3%
+5V
Functional description