5.3.2.
ASIC (IC1)
This custom IC is used for general FAX operations.
1. CPU
This model uses a Z80 equivalent CPU operating at 8MHz.
Many of the peripheral functions are handled by custom designed LSIS. As a result, the CPU only needs to process the result.
2. RTC
Real time clock.
3. DECODER
Decodes the address.
4. MODEM
Execute modulation and demodulation for the FAX.
5. ROM/RAM I/F
Controls the SELECT signal of ROM or RAM and bank switching.
6. CIS I/F
Controls document reading.
7. IMAGE DATA RAM
This is inside the ASIC and has 8KB which is used for image processing.
8. THERMAL HEAD I/F
Transmits the recorded data to the thermal head.
9. MOTOR I/F
Controls the motor which feeds the document and feeds the reading document.
10. OPERATION PANEL I/F
Serial interface with Operation Panel.
11. I/O PORT
I/O Port Interface (for analog board port control).
12. ANALOG UNIT
Electronic volume for the handset and monitor.
Sends beep tones, etc.
Explanation of the Pin Distribution (IC1)
Pin
Pin Name
Buffer Power supply
5V Tolerant
Signal Name
I/O
Description
1
X32OUT
VDDRTC
-
X32OUT
32.768kHz oscillator for RTC (built-in feed back
resistor)
2
X32IN
VDDRTC
NO
X32IN
32.768kHz oscillator for RTC (built-in feed back
resistor)
3
VDDRTC
+3.3V/BATT
32.768kHz backup power supply for RTC
4
XBACKEN
VDDRTC
YES
XRESET
Backup enable
5
VDDSRAM
+3.3V/BATT
RAMCS buffer/backup power supply for reset
6
XRAMCS
VDDSRAM
-
VDDSRAM
SRAM chip select ("H": 3.3V or BATT)
7
XRAMCE2/ALARM
VDDSRAM
-
OPEN
Not used
8
FTG
MULT3/5
NO
FTG
O FTG
9
F1
MULT3/5
NO
F1
O F1 (50%/75% selector)
10
MULT3/5
+5V
Power supply
11
VSS
DG
Ground
12
F2/OP50
MULT3/5
NO
E
O LCD control
13
FR/OP51
MULT3/5
NO
OPEN
O Not used
14
XRESET
3.3V
YES
XRESET
Reset input for internal digital circuit
15
VSS
DG
Ground
16
XORESET
3.3V
-
XORESET
Reset output
17
XRESETI
3.3V
YES
XRESETI
Voltage detector IC output for reset
18
XWDERR
3.3V
YES
XWDERR
Watch dog timer error
19
XRSTSWO/OP82
3.3V
YES
OPEN
O Not used
20
VIDRST/IOP20
3.3V
YES
OPEN
O Not used
21
SPHCLK/IOP21
3.3V
YES
OPEN
O Not used
22
DARKON/IOP22
3.3V
YES
OPEN
O Not used
23
ADSEL2/IOP23
3.3V
YES
OPEN
O Not used
24
BELL/OP
3.3V
YES
OPEN
O Not used
25
3.3V
+3.3V
Power supply
101
KX-FT72BR-G
Summary of Contents for KX-FT72BR-G
Page 3: ...1 1 LCD MESSAGE 1 INTRODUCTION 3 KX FT72BR G ...
Page 8: ...1 11 TEST CHART 1 11 1 ITU T NO 1 TEST CHART 8 KX FT72BR G ...
Page 9: ...1 11 2 CCITT NO 2 TEST CHART 9 KX FT72BR G ...
Page 10: ...1 12 LOCATION OF CONTROLS 1 12 1 OVERVIEW 10 KX FT72BR G ...
Page 29: ...2 3 4 3 MULTIPLE FEED CROSS REFERENCE DISASSEMBLY INSTRUCTIONS P 84 29 KX FT72BR G ...
Page 30: ...2 3 4 4 SKEW CROSS REFERENCE DISASSEMBLY INSTRUCTIONS P 84 30 KX FT72BR G ...
Page 34: ...CROSS REFERENCE DISASSEMBLY INSTRUCTIONS P 84 34 KX FT72BR G ...
Page 39: ...2 3 5 1 4 THE UNIT CAN COPY BUT CANNOT TRANSMIT RECEIVE 39 KX FT72BR G ...
Page 45: ...45 KX FT72BR G ...
Page 46: ...CROSS REFERENCE TEST FUNCTIONS P 82 46 KX FT72BR G ...
Page 47: ...CROSS REFERENCE TEST FUNCTIONS P 82 47 KX FT72BR G ...
Page 48: ...48 KX FT72BR G ...
Page 49: ...CROSS REFERENCE TEST FUNCTIONS P 82 CROSS REFERENCE TEST FUNCTIONS P 82 49 KX FT72BR G ...
Page 50: ...50 KX FT72BR G ...
Page 51: ...51 KX FT72BR G ...
Page 52: ...CROSS REFERENCE TEST FUNCTIONS P 82 52 KX FT72BR G ...
Page 58: ...58 KX FT72BR G ...
Page 59: ...Normal Wave Patterns 59 KX FT72BR G ...
Page 61: ...CROSS REFERENCE NG EXAMPLE P 63 CHECK THE STATUS OF THE DIGITAL BOARD P 64 61 KX FT72BR G ...
Page 62: ...CROSS REFERENCE CHECK THE STATUS OF THE DIGITAL BOARD P 64 62 KX FT72BR G ...
Page 63: ...2 3 6 2 NG EXAMPLE 63 KX FT72BR G ...
Page 66: ...2 3 7 2 DEFECTIVE ITS INTEGRATED TELEPHONE SYSTEM SECTION 66 KX FT72BR G ...
Page 68: ...2 Troubleshooting Flow Chart 68 KX FT72BR G ...
Page 69: ...69 KX FT72BR G ...
Page 73: ...2 3 11 READ SECTION Refer to SCANNING BLOCK P 112 73 KX FT72BR G ...
Page 79: ...2 4 5 SERVICE MODE SETTINGS Example of a printed out list 79 KX FT72BR G ...
Page 85: ...3 2 HOW TO REMOVE THE OPERATION BLOCK 85 KX FT72BR G ...
Page 86: ...3 3 HOW TO REMOVE THE OPERATION BOARD AND LCD 86 KX FT72BR G ...
Page 87: ...3 4 HOW TO REMOVE THE BOTTOM FRAME AND ANALOG BOARD 87 KX FT72BR G ...
Page 88: ...3 5 HOW TO REMOVE THE DIGITAL POWER SUPPLY BOARD AND AC INLET 88 KX FT72BR G ...
Page 89: ...3 6 HOW TO REMOVE THE MOTOR BLOCK AND SEPARATION ROLLER 89 KX FT72BR G ...
Page 90: ...3 7 HOW TO REMOVE THE MOTOR AND GEARS OF MOTOR BLOCK 90 KX FT72BR G ...
Page 91: ...3 8 HOW TO REMOVE THE IMAGE SENSOR CIS 91 KX FT72BR G ...
Page 92: ...3 9 HOW TO REMOVE THE DOCUMENT FEED ROLLER 92 KX FT72BR G ...
Page 93: ...3 10 HOW TO REMOVE THE THERMAL HEAD 93 KX FT72BR G ...
Page 94: ...3 11 INSTALLATION POSITION OF THE LEAD WIRES 94 KX FT72BR G ...
Page 96: ...4 3 FLAT PACKAGE IC INSTALLATION PROCEDURE 4 4 BRIDGE MODIFICATION PROCEDURE 96 KX FT72BR G ...
Page 97: ...5 CIRCUIT OPERATIONS 5 1 CONNECTION DIAGRAM 97 KX FT72BR G ...
Page 99: ...5 2 1 General Block Diagram 99 KX FT72BR G ...
Page 109: ...5 4 2 BLOCK DIAGRAM 109 KX FT72BR G ...
Page 111: ...111 KX FT72BR G ...
Page 117: ...5 4 6 3 4 COPYING CROSS REFERENCE SENSOR SECTION P 72 117 KX FT72BR G ...
Page 132: ...5 10 1 CIRCUIT DIAGRAM 132 KX FT72BR G ...
Page 135: ...5 12 POWER SUPPLY BOARD SECTION 135 KX FT72BR G ...
Page 137: ...6 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES 137 KX FT72BR G ...
Page 138: ...7 FIXTURES AND TOOLS 138 KX FT72BR G ...
Page 140: ...8 2 UPPER CABINET SECTION 140 KX FT72BR G ...
Page 141: ...8 3 LOWER CABINET P C B SECTION CROSS REFFERENCE MOTOR SECTION P 142 141 KX FT72BR G ...
Page 142: ...8 4 MOTOR SECTION 142 KX FT72BR G ...
Page 143: ...8 5 ACTUAL SIZE OF SCREWS 143 KX FT72BR G ...
Page 144: ...9 ACCESSORIES AND PACKING MATERIALS 144 KX FT72BR G ...
Page 163: ...163 KX FT72BR G Y M KXFT72BRG ...