Main Pba(Spl Model) - Muratec F-114 Service Manual

2.2.4 Main PBA(SPL Model)

The Engine Board and Controller Board have been integrated into a single PBA. This consists of the CPU,
printer scanner and line control functions. The CPU functions as the bus controller, I/O handler, motor driver
and PC inter-face. The main board sends the Current Image Video data to the LSU and manages the
Electrophotographic printing process. Circuits on the PBA drive include the main motor (paper feed,
cartridge, fuser), clutch driver, pre-transfer lamp driver, heat-lamp driver, CIS driver, scan motor driver,
modem and fan driver.
The signals from the paper feed jam sensor and paper empty sensor are inputted to the main board from
the power supply PBA.
Line interface circuit, it is a circuit for interfacing a telephone line with a modem and DAA. The circuit consists of
a matching circuit to conform to the impedance of the receiving telephone line and a circuit to conform to the impedance
of a modem.
Also, there is a ring detect circuit to detect a ring signal from the switchboard and a surge absorber to protect against
lighting strike surges on the incoming line.
SUPER1284
74LVX161284
STA471
(SCAN MOTOR DRIVE I/C)
Service Manual
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Product spec and feature
EXPANSION I/O
(HCT273)
ASIC SDRAM
BUFFER(INVERTER)
74HCTO 4M
2-15
MODEM Battery
FLASH MODEM CLOCK
MEMORY
MOTOR DIRVE IC
(A3 977 SLP)