47
KX-FT981LA-B / KX-FT987LA-B
[Surge Absorber Circuit]
This circuit is for absorbing surge voltage generated by the transformer.
[Control Circuit and Detecting Circuit]
The control circuit amplifies the output with increased voltage detected in the error detecting circuit. Then it drives the main transis-
tor.
In this power supply, the duty ratio is defined by changing the ON period of the main transistor.
This is shown as follows.
When the output voltage of the 24V circuit increases, the current of the photo coupler PC101 increases, the pulse width of the out-
put control IC becomes narrower and the ON period of Q101 becomes shorter.
[Over Current Limiter (O.C.L)]
The highest drain current (Q101) is limited by a limiter circuit (IC101) of 24V. The 24V output is limited by this circuit.
[Over Voltage Circuit]
If the 24V output increases because the error detecting circuit or control circuit is broken, IC101 will recognize this signal and output
becomes 0V.
Dummy load method (to quickly check the power supply output)
Refer to
Power Supply Board Section
(P.119).
Содержание KX-FT981LA-B
Страница 11: ...11 KX FT981LA B KX FT987LA B 6 Technical Descriptions 6 1 Connection Diagram ...
Страница 13: ...13 KX FT981LA B KX FT987LA B 6 2 1 General Block Diagram ...
Страница 21: ...21 KX FT981LA B KX FT987LA B 6 4 2 Block Diagram ...
Страница 23: ...23 KX FT981LA B KX FT987LA B ...
Страница 63: ...63 KX FT981LA B KX FT987LA B 11 2 2 User Mode KX FT987 ...
Страница 71: ...71 KX FT981LA B KX FT987LA B Countermeasure ...
Страница 72: ...72 KX FT981LA B KX FT987LA B REFERENCE Test Mode P 54 ...
Страница 73: ...73 KX FT981LA B KX FT987LA B REFERENCE Test Mode P 54 ...
Страница 74: ...74 KX FT981LA B KX FT987LA B REFERENCE Test Mode P 54 ...
Страница 75: ...75 KX FT981LA B KX FT987LA B REFERENCE Test Mode P 54 ...
Страница 76: ...76 KX FT981LA B KX FT987LA B ...
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Страница 78: ...78 KX FT981LA B KX FT987LA B REFERENCE Test Mode P 54 ...
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Страница 108: ...108 KX FT981LA B KX FT987LA B NG Wave pattern Note Refer to NG Example P 113 ...
Страница 110: ...110 KX FT981LA B KX FT987LA B I O and Pin No Diagram ...
Страница 113: ...113 KX FT981LA B KX FT987LA B 12 5 6 2 NG Example ...
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Страница 120: ...120 KX FT981LA B KX FT987LA B 12 5 9 2 Troubleshooting Flow Chart ...
Страница 126: ...126 KX FT981LA B KX FT987LA B 12 5 13 Thermal Head Section Refer to Thermal Head P 22 ...
Страница 127: ...127 KX FT981LA B KX FT987LA B 13 Service Fixture Tools ...
Страница 129: ...129 KX FT981LA B KX FT987LA B 14 1 Upper Cabinet Section 14 1 1 How to Remove the Image Sensor CIS and Feed Roller ...
Страница 130: ...130 KX FT981LA B KX FT987LA B 14 1 2 How to Remove the Cutter Unit KX FT987 only ...
Страница 131: ...131 KX FT981LA B KX FT987LA B 14 1 3 How to Remove the Lock Lever and Thermal Head ...
Страница 132: ...132 KX FT981LA B KX FT987LA B 14 2 Lower Cabinet Section 14 2 1 How to Remove the Bottom Frame ...
Страница 133: ...133 KX FT981LA B KX FT987LA B 14 2 2 How to Remove the P C Boards and Power Cord ...
Страница 135: ...135 KX FT981LA B KX FT987LA B 14 3 Operation Panel Section 14 3 1 How to Remove the Operation Panel Block ...
Страница 136: ...136 KX FT981LA B KX FT987LA B 14 3 2 How to Remove the Operation Board LCD and Platen Roller ...
Страница 137: ...137 KX FT981LA B KX FT987LA B 14 3 3 How to Remove the Separation Rubber Flap ...
Страница 138: ...138 KX FT981LA B KX FT987LA B 14 4 Installation Position of the Lead Wires ...
Страница 139: ...139 KX FT981LA B KX FT987LA B ...
Страница 147: ...147 KX FT981LA B KX FT987LA B 15 2 3 4 Copying REFERENCE Sensor Section P 123 ...
Страница 152: ...152 KX FT981LA B KX FT987LA B 16 1 4 Power Supply Board ...
Страница 154: ...154 KX FT981LA B KX FT987LA B 16 3 Test Chart 16 3 1 ITU T No 1 Test Chart ...
Страница 155: ...155 KX FT981LA B KX FT987LA B 16 3 2 ITU T No 2 Test Chart ...
Страница 168: ...168 KX FT981LA B KX FT987LA B MEMO ...
Страница 177: ...177 KX FT981LA B KX FT987LA B 20 Exploded View and Replacement Parts List 20 1 Cabinet and Mechanical Parts Location ...
Страница 178: ...178 KX FT981LA B KX FT987LA B 20 1 1 Operation Panel Section KX FT981 ...
Страница 179: ...179 KX FT981LA B KX FT987LA B 20 1 2 Operation Panel Section KX FT987 ...
Страница 180: ...180 KX FT981LA B KX FT987LA B 20 1 3 Upper Cabinet Section ...
Страница 181: ...181 KX FT981LA B KX FT987LA B 20 1 4 Lower Cabinet Section ...
Страница 182: ...182 KX FT981LA B KX FT987LA B 20 1 5 Gear Block Section ...
Страница 183: ...183 KX FT981LA B KX FT987LA B 20 1 6 Screws ...
Страница 184: ...184 KX FT981LA B KX FT987LA B 20 1 7 Accessories and Packing Materials ...
Страница 192: ...192 KX FT981LA B KX FT987LA B K N KXFT981LAB KXFT987LAB ...