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8.2. LCD CONTROL CIRCUIT
(1) CIRCUIT OPERATION
The LCD data is output from pins 12 of IC2.
LCD contrast adjustment is performed by the circuit composed of Q10, R44, R45, R46 and R47.
The contrast is determined only by the voltage level between pin 4 of CN1 and +5 V. Higher potential makes the contrast high.
LCD Contrast Control
CONTRAST
IC1 Pin 23
IC2 Pin 24
HIGH
L
L
MIDDLE
H
L
LOW
L
H
14
KX-T7565AL / KX-T7565AL-B
Summary of Contents for KX-T7565AL
Page 3: ...3 LOCATION OF CONTROLS 3 KX T7565AL KX T7565AL B ...
Page 22: ...9 TROUBLE SHOOTING GUIDE 9 1 NO OPERATION 22 KX T7565AL KX T7565AL B ...
Page 24: ...9 4 SPEAKER PHONE TROUBLE 9 5 TONE DIAL TROUBLE 24 KX T7565AL KX T7565AL B ...
Page 25: ...9 6 HANDSET TROUBLE 25 KX T7565AL KX T7565AL B ...
Page 28: ...11 TERMINAL GUIDE OF IC S TRANSISTORS AND DIODES 28 KX T7565AL KX T7565AL B ...
Page 29: ...12 CABINET AND ELECTRICAL PARTS LOCATION 29 KX T7565AL KX T7565AL B ...
Page 30: ...13 ACCESSORIES AND PACKING MATERIALS 30 KX T7565AL KX T7565AL B ...
Page 34: ...34 KX T7565AL KX T7565AL B ...
Page 36: ...KX T7565AL KX T7565AL B 36 ...
Page 39: ...39 KX T7565AL KX T7565AL B H KXT7565ALL4 KXT7565ALBL4 Printed in Japan ...