Read Sharp AL-840 (serv.man3) Service Manual online
(4) System diagram
(5) Operation
a. Wiring diagram
DC-200V
DC-310V
DC+500V
DC-850V
AC600V(P-P)
AC600V(P-P)
DC +3.5KV
AC600V(P-P)
AC600V(P-P)
DC
–
850V
DC +200V
DC
–
310V
–
310V/+200V
selection
MCU PWB
Scanning mirror
Laser
beam
Laser unit
No. 1 - 4 mirror
Main
charger
brush
Discharge
brush
Separation
electrode
electrode
Photoconductor drum
Transfer
charger
roller
Developing
roller
Toner
Paper
Image data
High voltage power PWB
TC
Q804
+24VP
Q807
MCON
MC
TC/Bias ON
DC
Bias
Bias
100V
DRUM
EARTH
EARTH
CB
+24VP
Q806
Q803
Q808
PWNSIN
CPU
(IC5)
(IC5)
ASIC
(IC8)
GND
3
TSIN
2
1
1
CN6
+5V
TSIN
MCU(PCU) PWB
Toner sensor
High voltage power PWB
Driver I
C801
T801
transformer
T802
transformer
Charger brush
Discharge brush
OPC drum
Separation electrode
Transfer charger roller
Supply roller
Developing roller
Earth sheet
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