2.3.6.
DIGITAL BOARD SECTION
One of most difficult problems to deal with is when the system will not boot up.
The symptom: No response when the power is turned on. (No LCD display, keys are not accepted.)
Note:
1. Electrical continuity may have existed at the factory check, but a faulty contact occurred as a result of vibration, etc.,
during transport.
2. Solder waste remaining on the board may get caught under the IC during transport, causing a short circuit.
Before we begin mass production, several hundred trial units are produced at the plant, various tests are applied and any
malfunctions are analyzed. (In past experiences, digital IC (especially SRAM and ROM) malfunctions are extremely rare after
installation in the product.)
This may be repaired by replacing the IC, (ASIC etc.). However, the real cause may not have been an IC malfunction but a
soldering fault instead.
Soldering faults which are difficult to detect with the naked eye are common, particularly for an ASIC and RA (Resistor Array).
But if you have an oscilloscope, you can easily determine the problem site or IC malfunction by checking the main signal lines.
Even if you don´t have such a measuring instrument, by checking each main signal line and resoldering it, in many cases the
problem will be resolved.
An explanation of the main signals (for booting up the unit) is below.
What are the main signals for booting up the unit?
Please refer to the DIGITAL BLOCK DIAGRAM (P.56).
The ASIC (including the CPU) (IC1) controls all the other digital ICs. When the power is turned on, the ASIC (CPU) retrieves
the operation code stored in the ROM (IC2), then follows the instructions for controlling each IC. All ICs have some inner
registers that are assigned to a certain address.
It is the address bus by which the ASIC (CPU) designates the location inside each IC. And the data bus reads or writes the data
in order to transmit the instructions from the ASIC (CPU) to the ICs.
These signal lines are all controlled by voltages of 5V (H) or 0V (L).
55
KX-FT63BX / KX-FT63BX-W
Содержание KX-FT63BX
Страница 8: ...1 10 ITU T NO 1 TEST CHART 8 KX FT63BX KX FT63BX W ...
Страница 9: ...1 10 1 CCIT NO 2 TEST CHART 9 KX FT63BX KX FT63BX W ...
Страница 10: ...1 11 LOCATION OF CONTROLS 1 11 1 OVERVIEW 10 KX FT63BX KX FT63BX W ...
Страница 11: ...1 11 2 CONTROL PANEL 11 KX FT63BX KX FT63BX W ...
Страница 14: ...1 13 3 SETTING YOUR LOGO 14 KX FT63BX KX FT63BX W ...
Страница 26: ...2 3 3 1 SIMPLE CHECK LIST CROSS REFERENCE TEST FUNCTIONS P 82 26 KX FT63BX KX FT63BX W ...
Страница 30: ...2 3 4 4 SKEW CROSS REFERENCE DISASSEMBLY INSTRUCTIONS P 85 30 KX FT63BX KX FT63BX W ...
Страница 34: ...CROSS REFERENCE DISASSEMBLY INSTRUCTIONS P 85 34 KX FT63BX KX FT63BX W ...
Страница 37: ...2 3 5 1 2 SOMETIMES THERE IS A TRANSMIT PROBLEM 37 KX FT63BX KX FT63BX W ...
Страница 39: ...2 3 5 1 4 THE UNIT CAN COPY BUT CANNOT TRANSMIT RECEIVE 39 KX FT63BX KX FT63BX W ...
Страница 44: ...Countermeasure 44 KX FT63BX KX FT63BX W ...
Страница 45: ...45 KX FT63BX KX FT63BX W ...
Страница 46: ...46 KX FT63BX KX FT63BX W ...
Страница 47: ...47 KX FT63BX KX FT63BX W ...
Страница 48: ...48 KX FT63BX KX FT63BX W ...
Страница 49: ...49 KX FT63BX KX FT63BX W ...
Страница 50: ...50 KX FT63BX KX FT63BX W ...
Страница 51: ...51 KX FT63BX KX FT63BX W ...
Страница 57: ...57 KX FT63BX KX FT63BX W ...
Страница 58: ...Normal Wave Patterns 58 KX FT63BX KX FT63BX W ...
Страница 60: ...60 KX FT63BX KX FT63BX W ...
Страница 62: ...62 KX FT63BX KX FT63BX W ...
Страница 63: ...2 3 6 2 NG EXAMPLE 63 KX FT63BX KX FT63BX W ...
Страница 66: ...Note Inside the digital board 66 KX FT63BX KX FT63BX W ...
Страница 67: ...2 3 7 2 DEFECTIVE ITS INTEGRATED TELEPHONE SYSTEM SECTION 67 KX FT63BX KX FT63BX W ...
Страница 69: ...2 Troubleshooting Flow Chart 69 KX FT63BX KX FT63BX W ...
Страница 73: ...73 KX FT63BX KX FT63BX W ...
Страница 79: ...2 4 5 SERVICE MODE SETTINGS Example of a printed out list 79 KX FT63BX KX FT63BX W ...
Страница 82: ...2 5 TEST FUNCTIONS CROSS REFERENCE BUTTON CODE TABLE P 83 PRINT TEST PATTERN P 83 82 KX FT63BX KX FT63BX W ...
Страница 85: ...4 DISASSEMBLY INSTRUCTIONS 4 1 HOW TO REMOVE THE BOTTOM FRAME 85 KX FT63BX KX FT63BX W ...
Страница 86: ...4 2 HOW TO REMOVE THE OPERATION PANEL BLOCK 86 KX FT63BX KX FT63BX W ...
Страница 87: ...4 3 HOW TO REMOVE THE OPERATION BOARD AND LCD 87 KX FT63BX KX FT63BX W ...
Страница 88: ...4 4 HOW TO REMOVE THE DIGITAL ANALOG POWER SUPPLY 88 KX FT63BX KX FT63BX W ...
Страница 89: ...4 5 HOW TO REMOVE THE HANDSET CRADLE CABINET AND SPEAKER 89 KX FT63BX KX FT63BX W ...
Страница 90: ...4 6 HOW TO REMOVE THE MOTOR BLOCK 90 KX FT63BX KX FT63BX W ...
Страница 91: ...91 KX FT63BX KX FT63BX W ...
Страница 92: ...4 7 HOW TO REMOVE THE ROLLERS 92 KX FT63BX KX FT63BX W ...
Страница 93: ...4 8 HOW TO REMOVE THE IMAGE SENSOR 93 KX FT63BX KX FT63BX W ...
Страница 94: ...4 9 HOW TO REMOVE THE IMAGE SENSOR 94 KX FT63BX KX FT63BX W ...
Страница 95: ...4 10 HOW TO REMOVE THE DOCUMENT TRAY 95 KX FT63BX KX FT63BX W ...
Страница 96: ...4 11 HOW TO REMOVE THE INSTALLATION POSITION OF THE LEAD WIRES 96 KX FT63BX KX FT63BX W ...
Страница 98: ...5 3 FLAT PACKAGE IC INSTALLATION PROCEDURE 5 4 BRIDGE MODIFICATION PROCEDURE 98 KX FT63BX KX FT63BX W ...
Страница 110: ...6 4 2 BLOCK DIAGRAM 110 KX FT63BX KX FT63BX W ...
Страница 112: ...112 KX FT63BX KX FT63BX W ...
Страница 118: ...6 4 6 3 4 COPYING CROSS REFERENCE SENSOR SECTION P 72 118 KX FT63BX KX FT63BX W ...
Страница 128: ...b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format 128 KX FT63BX KX FT63BX W ...
Страница 140: ...7 TERMINAL GUIDE OF THE IC S TRANSISTORS AND DIODES 140 KX FT63BX KX FT63BX W ...
Страница 141: ...8 FIXTURES AND TOOLS 141 KX FT63BX KX FT63BX W ...
Страница 142: ...9 CABINET MECHANICAL AND ELECTRICAL PARTS LOCATION 9 1 OPERATION PANEL SECTION 142 KX FT63BX KX FT63BX W ...
Страница 143: ...9 2 UPPER CABINET SECTION 143 KX FT63BX KX FT63BX W ...
Страница 144: ...9 3 LOWER CABINET P C B SECTION 144 KX FT63BX KX FT63BX W ...
Страница 145: ...9 4 MOTOR SECTION 145 KX FT63BX KX FT63BX W ...
Страница 146: ...9 5 ACTUAL SIZE OF SCREWS AND WASHER 146 KX FT63BX KX FT63BX W ...
Страница 147: ...10 ACCESSORIES AND PACKING MATERIALS 147 KX FT63BX KX FT63BX W ...
Страница 165: ...165 KX FT63BX KX FT63BX W Y MKXFT63BX KXFT63BX W ...