Kyocera Mita DC-1560, Service Manual

Page: 92 / 289

1AF
2-3-3
2-3-2 Main PCB
CPU
(IC11)
I/O
(IC6)
Address bus
Data bus
Solenoids
EPROM
(IC9)
Switches
Reset
circuit
_RESET
Chip Select
WD
Address
decoder
circuit
FTH
Fixing
unit
abnor-
mally
high
tempera-
ture/
shorted
ther-
mistor
detec-
tion
circuit
SM
Scanner
motor
drive
circuit
TFM
Toner
feed
motor
drive
circuit
Switches
and
sensors
NVRAM
(IC3)
Motors
and
solenoids
CPCB
H
OPCB
BL
HVTPCB
H REM
MPCB
Figure 2-3-2 Main PCB block diagram
The main PCB (MPCB) consists of the CPU (IC11), EPROM (IC9), NVRAM (IC3) and I/O
(IC6) as major components.
Based on the control programs in EPROM (IC9) and the data in NVRAM (IC3), the CPU
(IC11) controls the overall copier system by exchanging input and output signals with the
components connected to it directly or indirectly through I/O (IC6) via the address bus, data
bus and other control signals.
Other circuitry components of the main PCB are the fixing unit abnormally high temperature/
shorted thermistor detection circuit, toner feed motor drive circuit, scanner motor drive
circuit and reset circuit.