Canon LBP 2460 Service Manual - Page 111
Explanation of main ICs, CPU IC101, EP-ROM IC109, S-RAM IC110,
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CHAPTER 2 2. Explanation of main ICs a. CPU (IC101) An NEC 1-chip microcomputer (UPD784020GC-3B9) is used. The CPU communicates with the video controller and controls the optional paper deck. b. EP-ROM (IC109) The EP-ROM has a memory capacity of 64K bytes, and contains the control program for the paper deck's operation. c. S-RAM (IC110) The S-RAM has a memory capacity of 32K bytes, and contains the communication data with the video controller and the paper deck. I/O J102 IC101 I/O CPU BUS IC110 S-RAM IC109 EP-ROM J101 Option driver PCBs (paper deck, etc.) Figure 2-7-2 Video Controller PCB 2 - 65
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CHAPTER 2
2 - 65
2.
Explanation of main ICs
a.
CPU (IC101)
An NEC 1-chip microcomputer (UPD784020GC-3B9) is used.
The CPU communicates with the
video controller and controls the optional paper deck.
b.
EP-ROM (IC109)
The EP-ROM has a memory capacity of 64K bytes, and contains the control program for the
paper deck's operation.
c.
S-RAM (IC110)
The S-RAM has a memory capacity of 32K bytes, and contains the communication data with the
video controller and the paper deck.
Figure 2-7-2
IC101
CPU
IC110
S-RAM
IC109
EP-ROM
J102
J101
BUS
I/O
I/O
Video Controller
PCB
Option driver PCBs
(paper deck, etc.)