![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.
Содержание OKIPAGE 8c
Страница 15: ......
Страница 24: ......
Страница 31: ......
Страница 53: ...Partner Exchange BPX for any updates to this material http bpx okidata com ...
Страница 57: ...Page 26 Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 2 Parts Layout ...
Страница 58: ......
Страница 59: ...Figure 3 1 Covers ...
Страница 60: ...Figure 3 2 Print Assemblies ...
Страница 61: ...Figure 3 3 Base Assemblies ...
Страница 62: ......
Страница 136: ...Partner Exchange BPX for any updates to this material http bpx okidata com ...
Страница 167: ......
Страница 193: ......
Страница 194: ......
Страница 195: ......
Страница 196: ......
Страница 197: ......
Страница 198: ......
Страница 199: ......
Страница 207: ...Page 98 Service Guide OKIPAGE 8c Chapter 6 Troubleshooting Procedures Missing characters or colors ...
Страница 210: ...Page Service Guide OKIPAGE 8c Chapter 6 Troubleshooting Procedures Printout colors different from original colors ...
Страница 212: ...Page 100 Service Guide OKIPAGE 8c Chapter 7 Wiring Diagram 7 1 Resistance Check ...
Страница 213: ......
Страница 216: ... 3 Power Supply PCB ...
Страница 217: ... 4 PCO PCB 5 PXF PCB ...
Страница 253: ......
Страница 256: ......
Страница 277: ...Page 138 Service Guide OKIPAGE 8c Chapter Product Accessory I Second Paper Feed 5 2 PCB Layout TQSB 2 PCB ...
Страница 280: ...Page 140 Service Guide OKIPAGE 8c Chapter Product Accessory I Second Paper Feed High Capacity Second Paper Feeder ...
Страница 281: ...Table 6 1 High Capacity Second Paper Feeder No Description OKI J Part Qty 1 AOLD PCB 1 2 Feed roller 56408701 1 ...
Страница 283: ...Page 141 Service Guide OKIPAGE 8c Chapter Product Accessory I Second Paper Feed 2nd Tray Assembly ...
Страница 284: ......