Epson EPL-5500, Service Manual

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1.5.1 C169 MAIN-B Board
The C169 MAIN-B board is a video controller and engine controller board. The primary functions of
this board are receiving print data from the host, generating the print image (video), and sending
the print image to the engine controller via the video interface. A 32-bit 22 MHz RISC MB86933H
SPARKlite CPU in location IC1 is used, and the following memory chips and custom ICs are
assigned to the 4GB memory space.
❏ Memory chips
Code and font ROMs: four 4M-bit EPROMs (IC13, 14, 15, 16) or two 8M-bit mask ROMs (IC21, 22)
Optional NLSP font ROM: 4M-bit or 8M-bit ROM (IC12). Not available in U.S. version.
4M-bit DRAMs (IC17, 18)
EEPROM (IC11)
❏ Custom ICs
ASIC E05A91 (IC2)
ASIC E05A92 (IC3)
ASIC E05A93 (IC4)
❏ Others
Reset IC M51953BFP (IC6)
The engine controller consists of an M3807x 8-bit CPU, including a MASK ROM. It controls laser
scanning (the polygon mirror drive motor), image synchronization, laser beam pulse width, and
power.
There are two types of C169 MAIN-B boards used as after service parts. The following table shows
differences between them.
Table 1-16. Differences in Components for the C169 MAIN-B Board
US version Other Version
IC12 None IC socket
Jumper J20 Open Short
M B 8 6 9 3 3 H
(IC1 )
E 05 A 91
(IC2)
(IC 12)
(IC 16)
(IC 15)
(IC 14)
( IC 13)
M 3807
(IC201)
E 05 A 93
(IC4)
E 05 A 92
(IC3)
Figure 1-18. C169 MAIN-B Board
EPL-5500 Service Manual General Description
Rev. B 1-33