Muratec F-114P service manual Main Pbaspl Model

Product spec and feature

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.

			EXPANSION I/O
SUPER1284 74LVX161284	ASIC	SDRAM (HCT273)		MODEM Battery

	FLASH
STA471	MEMORY
	BUFFER(INVERTER)
(SCAN MOTOR DRIVE I/C)	74HCTO 4M

MODEM CLOCK	MOTOR DIRVE IC
	(A3 977 SLP)

Service Manual 2-15