AMT Datasouth Accel-7350, Service Manual

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70
Electronic Repairs
Introduction
This section will limit the explanation to the operational principles of the circuitry.
The Cable Connection table below shows the interface of the electronic assembly with the
mechanical assembly. You may be able to check the possibility of the connection faults or the
mechanical defects at this point.
Main PCB
Main PCB
Name of PCB: FP6000K-01VB
PCBA parts
CPU MB90705H(25 MHz), QFP, 120pin
EEPROM(2k bits), SOP, 8pin
Gate array BBG010(12.5MHz), QFP, 120pin
Gate array BBG020(12.5MHz), QFP, 100pin
Gate array BBG030(12.5MHz), QFP, 100pin
Reset circuit
MC motor drive circuit (4 circuit)
Head Adjust motor drive circuit
Ribbon motor drive circuit
C motor drive circuit
LF motor drive circuit (2 circuit)
Pin drive circuit
Detector
CPU MB90705H
QFP,120 pin, Acts with 12.5 MHz(input oscillation frequency is 25 MHz), Data bus width is 8 bit
and uses addresses A0-A22.
Main Function
Controlling indicator
Controlling and observing sensors
Data transmitting and receiving of serial interface
Analyzing data
DRAM control
Controlling LF motor rotation