Service manual
OTHER KINDS OF CONTROL
2-P-1
2 UNIT EXPLANATION
OTHER KINDS OF CONTROL
[1] Parts Energized when the Main Switch is OFF
1. Operation
If the power cord is plugged in the wall outlet, the
following parts are energized regardless of
whether SW1 (main) is ON or OFF:
a. CBR1 (circuit breaker 1)
If an excessive current flows due to a short in an
internal part or other factors, this breaker turns
OFF to cut off the power to the machine.
b. NF, NF2 (noise filter, noise filter 2)
The noise filter is used to reduce the noise arriv-
ing through the power line.
c. DCPS1 (DC power supply unit 1)
Even when SW1 is OFF, part of the 5 V output is
supplied to PSMB (power supply management
board). This power supply stops when SW2
(reset switch) is turned OFF.
d. Internal heaters
The tray heaters on HTR2 ~ 4 always carry cur-
rent, provided that SW3 (tray heater) is turned
ON, regardless of the states of SW1 and 2.
e. PSMB (power supply management board)
5V DC is supplied from DCPS1 to this board
except when SW2 (reset) is OFF.
DCPS1
AC(H)
AC(H)
AC(C)
5VDC
PSMB
NF
SW1
SW2
SW3
CBR1
NF2
HTR4
HTR3
HTR2
TRANS-
FORMER
1
LCT
HTR5
TRANS-
FORMER
2
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