6.4.3.
THERMAL HEAD
1. Function
This unit utilizes state of the art thermal printer technology.
The recording paper (roll paper) is chemically processed. When the thermal head contacts this paper it emits heat momentarily,
and black dots (appearing like points) are printed on the paper. If this continues, letters and/or diagrams appear, and the original
document is reproduced.
2. Circuit Operation
There are 9 driver ICs aligned horizontally on the thermal head and each one of these ICs can drive 192 heat emitting registers.
This means that one line is at a density of 192×9=1728 dots=(8 dots/mm).
White/Black (white=0, black=1) data in one line increments is synchronized at IC1 pin 115 (THCLK), and sent from IC1 pin 114
(THDAT) to the shift register of the ICs. The shift registers of the 9 ICs are connected in series, and upon the shift of dot
increment 1728, all the shift registers become filled with data, and a latch pulse is emitted to each IC from IC1 pin 118 (THLAT).
With this latch pulse, all the contents of the shift registers are latched to the latch registers. Thereafter, through the addition of
strobes from the IC1 pins (105, 106) only black dot locations (=1) among latched data activates the driver, and the current
passes to heat the emitting body causing heat emission.
Here, the two line strobes, STB1 to STB2, impress at intervals of 9.216 msec, as required for one-line printout.
The sequence is shown on the next page. [Moreover, for the strobe width, the thermistor value inside the thermal head is
detected according to IC1 pin 2. (See 6.3.1. Block Diagram.) Depending on that value, the strobe width is recorded in ROM
(IC2).
Accordingly, the strobe width is determined.
When the thermal head is not used, the IC1 (129, THON) becomes low, Q8 turns OFF, Q10 turns OFF, and the +24 V power
supply for the thermal head driver is not impressed to protect the IC.
115
KX-FT25LA
Содержание KX-FT25LA
Страница 8: ...1 10 CCITT No 1 TEST CHART 8 KX FT25LA ...
Страница 9: ...1 11 LOCATION OF CONTROLS 1 11 1 OVERVIEW 9 KX FT25LA ...
Страница 10: ...1 11 2 CONTROL PANEL 10 KX FT25LA ...
Страница 13: ...1 13 3 SETTING YOUR LOGO 13 KX FT25LA ...
Страница 16: ...1 14 2 1 MAINTENANCE LIST 1 14 2 2 MAINTENANCE CYCLE 16 KX FT25LA ...
Страница 21: ...2 2 1 Document Jam 21 KX FT25LA ...
Страница 23: ...2 3 3 Simple Check List 23 KX FT25LA ...
Страница 24: ...2 3 4 TROUBLESHOOTING ITEMS TABLE 24 KX FT25LA ...
Страница 25: ...2 3 4 1 ADF Auto Document Feed Section 1 No document feed 25 KX FT25LA ...
Страница 26: ...2 Document JAM 26 KX FT25LA ...
Страница 28: ...4 Skew 28 KX FT25LA ...
Страница 29: ...5 Image is distorted When printing 29 KX FT25LA ...
Страница 30: ...6 Black or white vertical lines appear 7 Skewed receiving image 30 KX FT25LA ...
Страница 32: ...32 KX FT25LA ...
Страница 34: ...2 3 4 2 1 Defective facsimile section 1 Transmit problem 34 KX FT25LA ...
Страница 35: ...2 Sometimes there is a transmit problem 35 KX FT25LA ...
Страница 37: ...4 The unit can copy but cannot transmit receive 37 KX FT25LA ...
Страница 41: ...7 How to output the Journal Report 41 KX FT25LA ...
Страница 43: ...Countermeasure 43 KX FT25LA ...
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Страница 48: ...48 KX FT25LA ...
Страница 49: ...49 KX FT25LA ...
Страница 50: ...50 KX FT25LA ...
Страница 52: ...1 Entering the remote programming mode and changing service codes 52 KX FT25LA ...
Страница 56: ...2 3 4 3 1 Digital Block Diagram 56 KX FT25LA ...
Страница 58: ...Normal Wave Patterns 58 KX FT25LA ...
Страница 60: ...60 KX FT25LA ...
Страница 62: ...62 KX FT25LA ...
Страница 63: ...NG Example 63 KX FT25LA ...
Страница 66: ...Note Inside the digital board Inside the operation board 66 KX FT25LA ...
Страница 67: ...2 3 4 4 2 Defective ITS Integrated Telephone System Section 67 KX FT25LA ...
Страница 69: ...Refer to 2 3 4 4 Analog Board Section 69 KX FT25LA ...
Страница 71: ...2 Troubleshooting Flow Chart 71 KX FT25LA ...
Страница 72: ...72 KX FT25LA ...
Страница 74: ...2 3 4 6 Operation Board Section 1 No key operation 2 No LCD indication 74 KX FT25LA ...
Страница 76: ...2 3 4 8 Read Section Refer to 6 4 4 SCANNING BLOCK 76 KX FT25LA ...
Страница 77: ...77 KX FT25LA ...
Страница 78: ...2 3 4 9 Thermal Head Section Refer to 6 4 3 THERMAL HEAD 78 KX FT25LA ...
Страница 86: ...2 5 TEST FUNCTIONS 86 KX FT25LA ...
Страница 89: ...4 DISASSEMBLY INSTRUCTIONS 89 KX FT25LA ...
Страница 90: ...90 KX FT25LA ...
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Страница 101: ...5 3 FLAT PACKAGE IC INSTALLATION PROCEDURE 5 4 BRIDGE MODIFICATION PROCEDURE 101 KX FT25LA ...
Страница 102: ...6 CIRCUIT OPERATIONS 6 1 CONNECTION DIAGRAM 102 KX FT25LA ...
Страница 104: ...6 2 1 General Block Diagram 104 KX FT25LA ...
Страница 105: ...6 3 CONTROL SECTION 6 3 1 BLOCK DIAGRAM 105 KX FT25LA ...
Страница 114: ...6 4 2 Block Diagram 114 KX FT25LA ...
Страница 116: ...116 KX FT25LA ...
Страница 121: ...6 4 6 3 2 Scanning 6 4 6 3 3 Printing Note See 6 5 SENSERS AND SWITCHES 121 KX FT25LA ...
Страница 122: ...6 4 6 3 4 Copying 122 KX FT25LA ...
Страница 131: ...b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format 131 KX FT25LA ...
Страница 133: ...6 7 Analog Unit Block Diagram 133 KX FT25LA ...
Страница 137: ...6 10 2 Circuit Diagram 137 KX FT25LA ...
Страница 140: ...6 12 POWER SUPPLY BOARD SECTION 140 KX FT25LA ...
Страница 153: ...10 TERMINAL GUIDE OF THE IC S TRANSISTORS AND DIODES 153 KX FT25LA ...
Страница 154: ...11 FIXTURES AND TOOLS 154 KX FT25LA ...
Страница 155: ...12 CABINET MECHANICAL AND ELECTRICAL PARTS LOCATION 12 1 OPERATION PANEL SECTION 155 KX FT25LA ...
Страница 156: ...12 2 UPPER CABINET SECTION 156 KX FT25LA ...
Страница 157: ...12 3 LOWER CABINET P C B SECTION 157 KX FT25LA ...
Страница 159: ...12 5 ACTUAL SIZE OF SCREWS AND WASHER 159 KX FT25LA ...
Страница 160: ...13 ACCESSORIES AND PACKING MATERIALS 160 KX FT25LA ...