Sony C9000 service manual Engine Control Board K73 PWB, Cpu Bus

2.2Engine Control Board (K73 PWB)

		28MHz
	Control Panel
	Duplex
	Cassette 2/3	CPU
	Analog output
		MSM66Q577
(Color registration sensor adjustment)
Analog input	Analog Input	A/D CON
(Temperature change)	Switch
	Analog input (OHP)
Analog input (Various densities)

Fan control

Cover front/upper open

Stacker full

Test switch

(Power supply cooling)

8Mbit(1MByte)	256Kbit(32KByte)
FLASH		SRAM⋅ 2

CPU BUS
				Motor interruption
				UART interruption
		48MHz				K Head I/F
						Y Head I/F
	32bit Video I/F					M Head I/F
						C Head I/F
	Heater control
	Fuse Cut Driver					Motor Driver
		EEPROM
			LSI			Motor Driver
			(VIDEO MEM
		D/A
			Containing				9x Pulse Motors
			4Mbit DRAM)
									DC Motor
Toner and ID sensors ID check					DC Motor Driver
								(Geared Motor)
		CU I/F				High-Voltage Power Supply
						Serial Interface (2 channels)

Paper Feed System Sensors

(Paper Feed, Paper Registration and Eject Sensors)

MT Sensor (Stage position and paper empty)

Cassette 1 Sensor (Paper empty and near empty)

Shutter, clutch, belt and fuser checks

Cassette size

Figure 2.3

The engine control block (PU) is controlled by the engine control board (K73 PWB) which consists of a CPU (MSM66Q577), general LSI chip, flash ROM, EEPROM, pulse motor drivers, and video memory (see Figure 2.3).

(1)CPU

This, a 16-bit CPU with an AD converter (OKI MIM66Q577), controls the entire system.

(2)General LSI

This LSI (MG63P011-001LA), which is contained in the printer engine control block, incorporates 4 megabits of video memory and has functions such as engine-controller interfacing, LED interfacing, motor control, sensor input, video memory control, main scan color misalignment correction, skew correction and high-voltage power supply control.

41388601TH Rev.2 14 /