Muratec DIGITAL LASER F-114 - Manual (Page 27)

Service Manual
Product spec and feature
2-15
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.
FLASH
MEMORY
MODEM
EXPANSION I/O
(HCT273) Battery SDRAM
STA471
(SCAN MOTOR DRIVE I/C)
SUPER1284
BUFFER(INVERTER)
74HCTO 4M
MODEM CLOCK MOTOR DIRVE IC
(A3 977 SLP)
ASIC 74LVX161284