Sharp UX-4000M - UX 4000 B/W Laser Printer Service Manual page 119

2. Description
2-1. Extension board unit
1) Remove the TEL/LIU PWB, Control PWB and Bottom board unit
(Printer and Power supply PWB) from this unit, and mount the
extencion board unit instead.
• Before connecting the wiring to the extension bord unit, set the test
PWB switches to the fixed position.
2) The setting is as follows.
Extension board connection diagram
• Caution!
1) In the base machine (Printer PWB), take care that the cam may
not nip the cable. Be also careful of sensor levers of PIN and
POUT.
2) SW101 of the Power supply PWB is the interlock switch. When
opening and closing the printer unit cover, manually switch ON/
OFF.
When opening cover: OFF (No operation required) (+24 V OFF)
When closing cover: ON (Press the switch button) (+24 V ON)
3) Connect all cables.
4) High-pressure voltage is applied to all of FU-G, DRUM, MC, TC,
and DC-Bias on the Printer PWB; Avoid contacting them with other
components.
5) Into the connector, insert QCNW-334ASCZZ with its contact sur
face facing downward.
6) Be sure to connect the safety ground (AC cord) with the plate
metal.
The recording paper sensor(Pin and Pout) are operated by OR of the
mechanical unit switch and the test PWB switch. When performing in-
stallation in the machine unit, set the test PWB switches to the fixed
position.
Mechanical nuit
Actual operation with mechanical unit
Recording paper ON/OFF operation
sensor(Pin/Pout)
PWB sensor check
Recording paper
OFF
sensor(Pin/Pout)
* Recording paper: ON
No recording paper: OFF
CNPN2
CNCIS2
CNMT2
CNSP2
CNFUSE2
CNHT2
CNLSU2
CNSEN
CNMMT2
CNTNR2
CNPL2
CNFM2
CNRTH2
CNHS2
CN FU
CN MC
CN DRUM
CN TC
CN Dc–Bias
PWB to be tested
Insert spacer
(PSAPAZ2254SCZZ)
OFF(Photo interrupter
is interrupted.)
ON/OFF operation
Check Printer PWB
8 – 2
Ref No. Cable parts code
QCNW – 321ASCZZ
QCNW – 322ASCZZ
QCNW – 324ASCZZ
QCNW – 325ASCZZ
QCNW – 326ASCZZ
QCNW – 327ASCZZ
QCNW – 334ASCZZ
QCNW – 335ASCZZ
QCNW – 336ASCZZ
QCNW – 337ASCZZ
QCNW – 338ASCZZ
QCNW – 339ASCZZ
QCNW – 340ASCZZ
QCNW – 341ASCZZ
QCNW – 328ASCZZ
QCNW – 330ASCZZ
QCNW – 331ASCZZ
QCNW – 332ASCZZ
QCNW – 333ASCZZ
Check Control PWB
Fig. 2
UX-4000MU
FO-2950MU/C
Description
EX. Cable, 22-22 PIN
EX. Cable, 7-7 PIN
EX. Cable, 6-6 PIN
EX. Cable, 2-2 PIN
EX. Cable, 3-3 PIN
EX. Cable, 3-3 PIN
EX. Cable, 9-9 PIN
EX. Cable, 2-2 PIN
EX. Cable, 4-4 PIN
EX. Cable, 5-5 PIN
EX. Cable, 2-2 PIN
EX. Cable, 3-3 PIN
EX. Cable, 2-2 PIN
EX. Cable, 2-2 PIN
EX. Cable, 1-1 PIN, BLUE
EX. Cable, 1-1 PIN,YELLOW
EX. Cable, 1-1 PIN,ORANGE
EX. Cable, 1-1 PIN,RED
EX. Cable, 1-1 PIN,BROWN
Ex. board
Insert spacer
(PSAPAZ2254SCZZ)
Check TEL/LIU PWB
Insert spacer
(PSAPAZ1060LCZZ)
SW101
Check Power supply PWB