Sharp FO-6700 Service Manual Page 57
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FO-6700U
FO-67DL
5 – 1
[2] Circuit description of Main Control PWB
1. General description
The Main Control PWB is composed of the following blocks.
Main Control Block
Image Memory Block
Back-up Circuit Block
Image Signal Process Block
Speaker Amplifier Block
Reading Process and Mechanical Control Block
Gate Array (A) Block
Gate Array (B) Block
CODEC Block
Page Memory Block
Drive Block
DPRAM I/F Block
2. Description of each block
(1) Main Control Block
The Main Control Block uses RISC microprocessor HD6437021 as CPU,
being composed of ROM (2 MByte) and DRAM (2 MByte).
1) HD6437021 (IC12): pin-100, QFP (main CPU)
The device is a microprocessor which integrates the peripheral func-
tions, using CPU of 32-bit RISC type as the core. In the instrument, the
following peripheral functions are mainly used.
ROM of 32 KByte and RAM of 1 KByte are integrated.
A part of programs are stored in the integrated ROM.
DMA Controller (4 channels are provided, and 2 channels alone are
used.)
ch.0: Used to transmit image data between CODEC (HD813201F)
and DRAM (IC13).
ch.2: Used to transmit image data between Flash memory on the
Memory PWB and DRAM(IC13).
Clock-synchronous type serial communication interface commands
and statuses are communicated with PCU.
Interruption
IRQ2: Interruption request from Line-1 Control PWB.
IRQ3: Interruption request from Line-2 Control PWB.(
OPTION:FO-67DL
)
IRQ4, IRQ7: Interruption request from Gate Array (A) (LZ9FJ59)
IRQ6: Interruption request from Gate Array (B) (LR38292)
IRQ0, IRQ1, IRQ5 : Not used.
NMI : Not used.
DRAM Controller
Addressing to DRAM(IC13) of the system and control and refresh
control of RAS and CAS signals are executed.
Timer and Watch Dog Timer
General-purpose I/O Port
Control of LIU and control of analog process of read signals are
executed.
Clock Oscillation
Crystal oscillator of 19.66 MHz is connected for operation of 19.66
MHz.
Generation of Alarm Sound and Ringer Sound
The keys on the operation panel are pressed to respectively gener-
ate the key input sound, alarm sound and ringer sound.
2) 27C160 (IC2): pin-42, DIP (EPROM)
Programs are stored in a 16 Mbit ROM.
3)
HY5118164 or MSM5118165 (IC13, IC23): pin-42, SOJ (DRAM)
Used as the system memory of Main CPU and transmission buffer of
communication.
CHAPTER 5. CIRCUIT DESCRIPTION
[1] Circuit description
1. General description
In this machine, the facsimile control block except the printer control is
mainly composed of the units shown in Fig. 1.
2. PWB configuration
Fig. 1
1) Main Control PWB
The Main Control PWB controls all the other operations except the print-
ing operation of the printer and line control.
2) Line Control PWB
The Line-1 Control PWB controls TX/RX of 1st line and the speaker
volume. The Line- 2 Control PWB controls TX/RX of 2nd line, when FO-
67DL (OPTION) is installed.
3) LIU PWB 1, LIU PWB 2 (OPTION:FO-67DL)
The LIU PWB controls the I/F telephone function of the circuit with the
control signals from the Line Control PWB.
4) CIS UNIT
CIS UNIT converts the image of the sending or copying draft into the
photoelectric signals and transmits the signals to the Main Control PWB.
5) Operation Panel PWB
The Operation Panel PWB detects the key input, turns on and off LED
and displays LCD according to the control signals from the Main Control
PWB.
6) Power Supply PWB
DC voltages (+5V, +24V) are produced from AC120V, and are supplied
to the Printer Unit and Main Control PWB Unit.
7) Memory PWB
The 4MByte image memory composed by flash memory which can be
supported. When FO-4ML/8ML/12ML (OPTION) installed, a capacity rise
is possible to 8MB/12MB/16MB.
8) 2nd. Cassette PWB
The paper feeding control is relayed from the 2nd. cassette.
9) 3rd. Cassette PWB
The paper feeding control from the 3rd. cassette is relayed and the feed-
ing motor is driven.
AC CORD
OPERATION PANEL
PWB
MAIN CONTROL PWBLIU PWB 1
LINE 1
CIS
UNIT
POWER SUPPLY PWB
PRINTER
PWB
PRINTER
UNIT
LINE-1
CONTROL PWB
MEMORY
PWB
2ND.
CASSETTE
PWB
3RD.
CASSETTE
PWB
LINE-2
CONTROL PWB
(OPTION:FO-67DL)
LIU PWB 2
(OPTION:FO-67DL)
LINE 2
- 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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