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Service Guide ML320/ML321
Chapter A Reference Charts
A.2.01 Control Board (LXMC) - Rev A and B
Function
The control board contains the microprocessor and its peripheral circuits. The drive circuits,
paper end sensor, and the interface connector are on this board. A 3.25 V lithium battery is
on this board.
Firmware
Q13
Program ROM
Q8 and Q9
Dynamic RAM (require a constant refresh signal)
Q12
Static RAM (backed up by a 3.25 V lithium battery)
Fuses
Rev 1 and 2
F1: Thermal Fuse (The fuse is located on Q10.)
Rev 3 and up
F1: Inline Thermal Fuse
Jumpers
SP1
Side A
Enable I-Prime
Side B
Disable I-Prime
SP2
Side A
Auto Line Feed always enabled
Side B
Auto Line Feed status determined through Menu setting
SP3
Side A
+ 5 vdc is applied to Pin 18 of the parallel interface
Sensors
Paper End
Switches
SASF
Test Points