Ricoh A151, Field Service Manual

Page: 288 / 397

7. POWER DISTRIBUTION
NOTE: Items marked with an are different from the A151 and A152
copiers.
When this copier is plugged in and the main switch is turned off, ac power is
supplied via the ac drive board to the optional anti-condensation heaters.
When the front cover and/or the exit cover is open, the cover safety switch
completely cuts off power to all ac and dc components.
When the main switch is turned on, the ac power supply to the
anti-condensation heater is cut off and ac power is supplied to the ac drive
board. The dc power supply board receives wall outlet ac power through the
ac drive board.
The dc power supply board converts the wall outlet ac power input to +5
volts, +24 volts, and a zero cross signal, all of which are supplied to the main
board.
F u s i n g L a m p
E x p o s u r e L a m p
M a i n M o t o r
D o c u m e n t F e e d e r
(Option)
M a i n S W
Power Relay
( R A 4 0 1 )
M a i n M o t o r
R e l a y ( R A 4 0 2 )
E x p o s u r e L a m p
Drive Circuit
F u s i n g L a m p
Drive Circuit
M a i n
Board
Solenoids
C l u t c h e s
P o w e r P a c k s
L e n s M o t o r
(A203 copier only)
4th/5th Mirror Motor
(A203 copier only)
✽
Optics Cooling Fan Motor
(A202 and A203 copier)
Exhaust Blower Motor
✽
Toner Supply Motor
✽
Q u e n c h i n g L a m p
S e n s o r s
S w i t c h e s
DF Interface Board
(A203 copier only)
T h e r m i s t o r s
Operation Panel Board
Image Density Sensor
S c a n n e r M o t o r
S c a n
Signal
5 V ( V C )
2 4 V ( V A )
5 V ( V C )
2 4 V ( V A )
5 V
2 4 V ( V A )
C o v e r S a f e t y S W
2 4 V ( V A )
2 4 V ( V A )
2 4 V ( V A )
AC Drive Board
D C P o w e r
Supply Board
2 4 V ( V A )
Z e r o C r o s s
5 V ( V C )
Anti-condensation Heaters
- D r u m ( O p t i o n )
-Optics (Option)
A C P o w e r ( 1 1 5 V o r 2 2 0 V ~ 2 4 0 V )
R A M
P a c k
A C p o w e r
D C p o w e r
A203D500.wmf
POWER DISTRIBUTION
A202/A203 8-10 SM