Ricoh FAX7000L, Field Service Manual

Page: 374 / 377

LB
Line Buffer: An area of memory where lines
of video data are temporarily held before
being passed on to the next process. This
helps to ensure a smooth flow of data.
LCD
Liquid Crystal Display: A display on the opera-
tion panel used to inform machine status and
programming prompts to the user.
LDDR
Laser Diode Driver: This PCB contains the
laser diode and components for driving it.
LDS
Laser Data Synchronizer: This LSI generates
the clock signal for data output to the laser
diode and smooths the data to 400 x 400 dpi.
LED
Light Emitting Diode: A diode that emits light;
used as an indicator lamp.
LIB
Lower Interface Board: This PCB links the
SPU to the components in the lower cassette.
Laser Synchronization Detector: This PCB
detects the start of each scan of the laser
beam across the master belt.
LSI
Large Scale Integration: A process of making
complex microchips.
MBU
Memory Board Unit: This PCB contains the
system software ROMs, system parameter
memory, and the battery for backing up the
system parameter and voice message
memories.
MCF
Message Confirmation: A protocol signal that
confirms reception of the page just sent.
MH
Modified Huffman: A compression method
used to reduce the number of bits needed to
represent the facsimile data. MH coding is a
one-dimensional run length digital scheme of
coding black and white runs.
MMR
Modified Modified Read: A modified version
of MR coding (see below).
MPS
LSD
A-3