Sharp FO-475TH Service Manual page 70

2. Description
2-1. Relay board unit
1. Remove the TEL/LIU PWB, control PWB and Power Supply PWB
from this unit, and mount the relay board unit instead.
•
Before connecting the wiring to the relay board unit, set the test
PWB switches to the fixed position.
2. The setting is as follows.
Relay
cable
12
CNLIUA
1
CNPW
CHECK
CONTROL
PWB
NOTE
(PSNS)
(PSNS)
The relay cables are used as one pair.
The sensor is wired as shown in the following figure.
The door swich and hook switch are manually operated.
TEL/LIU
CNLIU
PWB
POWER
SUPPLY
PWB
DON'T SEPARATE
UNIT
EXTENSION PWB
TP2(+5V)
TP1(DG)
TP3
K
C
TP3
A
E
The recording paper sensor (PSNS) is operated by OR of the mechani-
cal unit switch and the test PWB switch. When performing installation in
the machine unit, set the test PWB switches to the fixed position.
Recording paper
sensor
Recording paper
sensor
RELAY CABLE
These cables are connected from the extension board
and the checked control PWB at TP1 thru TP3 (signals
of DG, +5V and PSNS).
8 – 2
Mechanical unit PWB to be tested
Actual operation with mechanical unit
ON/OFF operation OFF (Photo interrupter
is interrupted.)
PWB sensor check
OFF ON/OFF operation
TEL/LIU
CHECK
PWB
CONTROL
PWB
DOOR
SENSOR
POWER
SUPPLY
PWB
UX-258TH
FO-475TH