Sharp FO-6700 Service Manual Page 66
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
Rated. / 5. Based on customer reviews
FO-6700U
FO-67DL
5 – 10
(9) CODEC Block
This block is composed of CODEC, LS374 and LS244 in order to de-
modulate the contracted image data of the draft read with the scanner
and the letter image transmitted in the DMA mode from the system
memory.
1) HD813201F (IC26) ... pin-80, 6FP (CODEC)
It operates at 16 MHz corresponding to the crystal oscillator (X5) of 16
MHz.
The image memory is commonly used as the page memory. The image
data of the draft read with the scanner in the page memory is contracted
by MMR, and is transferred to the system memory (DRAM: IC13) by the
DMA transfer function of CPU. Moreover, the image data transferred in
the DMA mode from the system memory are demodulated with MMR,
and are developed into the page memory.
2) HD74LS374 (IC14) ... pin-20, SOP
The data hold time during writing from Main CPU to HD813201F is as-
sured.
3) HD74LS244 (IC20) ... pin-20, SOP
When the Main CPU reads the inner register of HD813201F, it will read
the data through this buffer.
Fig. 3
IMAGE BUS
CONTROLLER
PROCESSING UNIT
IMAGE
BUS
BUFFER
E-FIFOAch
A0 ~ A2
D0 ~ D7
DRQTO
CODE
TABLE
ROM
CLKI
CKTST0
RTCL/RTCH
BRQT
SYSTEM
BUS
INTERFACE
PLL
CIRCUIT
DACKIN
E-FIFOBch
D-FIFOAch
D-FIFOBch
DBR
IMAGE DATA
DEMODULATING
CIRCUIT
PIXEL VARIATION
DETECTION
CIRCUIT
MICRO
PROGRAM
CONTROLLER
CONTINUOUS
EOL
DETECTION
CIRCUIT
MA/MD0 ~ 15
MA16 ~ 21
BACLN
DRQTI
DACKON
IMAGE BUS
INTERFACE
CODER & DECODER
- SERVICE MANUAL 1
- FACSIMILE 1
- CONTENTS 3
- [1] Specifications 4
- 28 29 30 31 32 33 5
- 40393837363534 5
- CHAPTER 2. ADJUSTMENTS 9
- MEMORY CLEAR ? 10
- 1) Soft switch mode 11
- 2) Print area 11
- 3) ROM & RAM check 11
- After setup of the document 12
- Only the sensor which is 12
- SPEED key SXXX XXX 13
- : Speed key number 13
- 2-2. Print diagnosis 15
- • Blank paper aging mode 15
- • SW1 to SW30 : For line 1 17
- • SW31 to SW60 : For line 2 17
- 4. Soft switch description 18
- • Soft switch 18
- [3] Troubleshooting 44
- [4] Error code table 45
- Super G3 mode 46
- 2. Service call error massage 46
- Wire treatment 52
- [1] Block diagram 53
- [2] Wiring diagram 54
- [1] Circuit description 57
- (8) Gate Array (B) Block 64
- (9) CODEC Block 66
- (10) Page Memory Block 69
- (11) Driver Block 70
- (12) DPRAM I/F Block 71
- 1. General description 72
- (1) Sub CPU Block 72
- (2) Modem Block 75
- (8) JBIG Block 80
- IC3: VHiM65761FP-1(M65761FP) 80
- CPU & memory block 82
- Flash memory block 3/16 84
- Reading block 4/16 85
- Gate array (B) block 7/16 88
- Codec block 8/16 89
- Page memory block 9/16 90
- Other block 14/16 95
- Connector block 1 15/16 96
- FO-6700U 100
- Modem block 2/7 101
- Gate array block 3/7 102
- QM-coder block 4/7 103
- Dual port RAM block 5/7 104
- Access control block 6/7 105
- Connector block 7/7 106
- LIU PWB parts layout 109
- Printer PWB circuit 2/2 111
- T1 7 8 – 9 114
- T1 2 – 3 114
- Power Supply PWB parts layout 115
- High Voltage PWB parts layout 119
- Toner Empty PWB parts layout 120
- Memory PWB circuit 2/3 126
- Memory PWB circuit 3/3 127
- [1] G3 Protocol 129
- [2] Super G3 Protocol 130
- [3] Power On Sequence 131
- CHAPTER 8. OTHERS 132
- 2. Description 133
- For inspection 135
- [2] IC Signal Names 137
- 8 7 5 8 B 138
- PRINTER PWB UNIT 139
- 16 15 14 13 12 11 10 9 142
- 1 2 3 4 5 6 7 8 142
- 1C 2C 3C 4C 5C 6C 7C COM 142
- 1B 2B 3B 4B 5B 6B 7B E 142
- PARTS GUIDE 143
- [12] 2nd.Cassette (1) 158
- I n d e x 184
- © 2000 BY SHARP CORPORATION 192
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