Board Diagrams - OKIDATA ML320 Service Manual

A.1

BOARD DIAGRAMS

A.1.01 General Information
This section describes the characteristics of the printed circuit boards used in the Microline 320
and Microline 321 printers. The following areas are covered in each section.
- Function
- Firmware
- Fuses
- Jumpers
- Switches
- Sensors
- Test Points
Where an item is not applicable, the word NONE will be listed.
Serial Number Identification & (A-D) Revision Levels
A
Rev A units are original production units. An interconnect module connects the power supply board
to the main control board.
B
Rev B units are retrofitted to include a modified interconnect module, which prevents corrosion.
C
Rev C units have a cable harness connection between the power supply board and the main control
board. The cable harness replaces the interconnect module.
D
Rev D units have no power supply board. The circuitry for the power supply board has been
incorporated on the main control board.
Please Note the following:
The Rev C main control board (LXMC) and power supply board (SUII) are downward compatible
with Rev A and B units.
The Rev A and Rev B main control board (LXMC) and power supply board (PAII) cannot be used
in Rev C units.
Rev D units do NOT use Rev A, Rev B, or Rev C main control boards, transformers, operator panels,
upper covers, and lower covers. Rev D units have a unique main control board (LXMR), no power supply
board, a 50 volt transformer, and a unique operator panel (LXON).
NOTE:
Service Guide ML320/ML321
Chapter A Reference Charts
Page: 117