![background image](http://html1.mh-extra.com/html/okidata/okipage-8c/okipage-8c_service-manual_729934016.webp)
Functional Block Diagram of Main Control Board
(1)
CPU
The CPU is a 64-bit RISC architecture processor (provided y NKK). It inputs a frequency
of 50 MHz and runs at 100 MHz. It transfers data to a from memory at 50 MHz.
(2)
Mask ROM
The mask ROM block consists of four 16 Mbit (1M x 16 bits) chips and its total size is 8M
bytes. The chips are mounted on the PCR-PCB by means of IC sockets and store
programs and character fonts.
(3)
DRAM
The DRAM block consists of eight 16 Mbit (1M x 16bits) chips and its total size is 16M
bytes. The chips are mounted on the PCR-PCB and can be expanded up to 80M bytes
by adding the 32M byte SIMMs to the SIMM slots on the PCR-PCB.
(4)
EEPROM
The EEPROM block consists of 1K-bit chips mounted on a board by means of IC sockets
and stores the following:
Menu data
z
Counter values
z
Adjustment values
z
(5)
Flash ROM
The Flash ROM block consists of four 4M bit (256K x 16bits) chips and its total size is 2M
bytes. The chips are mounted on the PCR-PCB and are used for storing fonts, macro
and demo pages.
(6)
Memory control LSI
This block mainly consists of memory control, CPU control, compression and
decompression, and video interface functions.
(7)
Interface control LSI
This block mainly consists of PU interface control, operator panel interface control,
EEPROM control, parallel interface control, and HSP control functions.
Summary of Contents for OKIPAGE 8c
Page 15: ......
Page 24: ......
Page 31: ......
Page 53: ...Partner Exchange BPX for any updates to this material http bpx okidata com ...
Page 57: ...Page 26 Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 2 Parts Layout ...
Page 58: ......
Page 59: ...Figure 3 1 Covers ...
Page 60: ...Figure 3 2 Print Assemblies ...
Page 61: ...Figure 3 3 Base Assemblies ...
Page 62: ......
Page 136: ...Partner Exchange BPX for any updates to this material http bpx okidata com ...
Page 167: ......
Page 193: ......
Page 194: ......
Page 195: ......
Page 196: ......
Page 197: ......
Page 198: ......
Page 199: ......
Page 212: ...Page 100 Service Guide OKIPAGE 8c Chapter 7 Wiring Diagram 7 1 Resistance Check ...
Page 213: ......
Page 216: ... 3 Power Supply PCB ...
Page 217: ... 4 PCO PCB 5 PXF PCB ...
Page 253: ......
Page 256: ......
Page 284: ......