OKIDATA ML380, Руководство по обслуживанию

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Page: 117
Service Guide ML380
Chapter A Board Diagrams
A.2 INDEX TO CHARTS
Description Board Designation Section
Main Control Board (Original) UMMB A.2.01
Main Control Board (Current) UMMB A.2.02
RS-232C Serial Module UMRS A.2.03
Modifications to Main Control Board (UMMB)
There are two types of UMMB boards that you might encounter when servicing the Microline 380 printer.
Summary - UMMB: Original Board
The original board (refer to A.2.01) contains the following PROM/ ROM combination:
Q2 - contains a 256 K or a 512 K PROM in a socket. This PROM contains the printer control firmware.
Q3 - is a character generator ROM which is soldered to the printed circuit board.
The original board contains one jumper (SP4). Refer to A.2.01 for jumper placement information.
Summary - UMMB: Current Board
The current board (refer to A.2.02 ) contains the following PROM/ ROM combination:
Q2 - contains a 1 MB MASK PROM in a socket. This PROM contains the printer control firmware and the
character generator.
Q3 - is an empty socket. However, if either the 256 K or 512 K PROMS are installed in Q2, a character
generator must be installed in Q3.
The current board contains three jumpers (SP4, 6 and 7). Refer to A.2.02 for jumper placement
information.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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