Sharp FACSIMILE FO-4500 Service Manual page 145

[For inspection of TEL/LIU PWB]
1) Remove the left upper panel.
2) Remove the inner tray from the unit, and remove the control PWB.
3) Mount the extension board (EXT-A) in the place where the control
PWB has been removed.
4) Connect the cables from the unit to the connectors (A side)
(CNSENA, CNNNCDA, CNPWA, CNPRTA, CNRSA, CNPNA,
CNTXMA, CNLEDA, CNSTPA, CNDRA) of extension board (EXT-
A) as on the control PWB.
5) Connect the extension cables (10 types) to the connectors (B
side) of extension board (EXT-A).
6) Remove the ROM cover of inner tray, pull out the extension ca-
bles (10 types) from the ROM replacing window, and mount the
inner tray on the unit.
* When checking the TEL/LIU PWB, the extension cable (QCNW-
4609SCZZ) and extension board (EXT-B) are not used.
7) Connect the TEL/LIU PWB to be checked to the connector
(CNLIU) of control PWB.
8) Connect the extension cables (10 types) pulled out from the unit
to the control PWB.
9) Fit the speaker unit and hook switch unit of left upper panel as an
assembly in the TEL/LIU PWB to be checked.
Extension board connection diagram
EXTENSION
BOARD
(EXT-A)
CNDR
EXTENSION
CABLE
CHECK
TEL/LIU
PWB
SPEAKER
WHITE
8 – 2
Cable parts code
QCNW – 4597SCZZ
QCNW – 4598SCZZ
QCNW – 4599SCZZ
QCNW – 4600SCZZ
QCNW – 4601SCZZ
QCNW – 4602SCZZ
QCNW – 4604SCZZ
QCNW – 4605SCZZ
QCNW – 4606SCZZ
QCNW – 4609SCZZ
CNSTP
CNTXM
CNCCD
CNLED
CNSEN
CNPW
CNPRT
CHECK
CONTROL
PWB
FO-4500H
Connector Remark
CNCCD
CNSEN
CNPW
CNRS
Control PWB
CNPN
CNLED
CNSTP
CNROL
CNTXM
CNPRT
CNRS
CNPN