Samsung RB195BSSB Service Manual - Page 51

Display Driving Circuit

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OPERATION PRINCIPLES BY PARTS OF CIRCUIT 12-8) DISPLAY DRIVING CIRCUIT 1) KEY SCAN &DISPLAY DRIVING PRINCIPLE As shown in the wave diagram below,Micom sends out "high "signals through the MICOM 6 terminals of NO #1→2→3→4→5→6 for 2ms each every 12ms.This signal goes to output terminal via input terminal of IC51 (TD62783AP or KID65783AP). Here, the peak to peak voltage of the square wave is 11~12V DC and each output wave is as follows. 2msec V 10msec GRID #1 GRID #2 GRID #3 GRID #4 GRID #5 GRID #6 T 51

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51
OPERATION PRINCIPLES BY PARTS OF CIRCUIT
12-8) DISPLAY DRIVING CIRCUIT
GRID #1
V
T
GRID #2
GRID #3
GRID #4
GRID #5
GRID #6
2msec
10msec
1) KEY SCAN &DISPLAY DRIVING PRINCIPLE
As shown in the wave diagram below,Micom sends out “high ”signals through the MICOM 6
terminals of NO #1
→
2
→
3
→
4
→
5
→
6 for 2ms each every 12ms.This signal goes to output terminal
via input terminal of IC51 (TD62783AP or KID65783AP). Here, the peak to peak voltage of the
square wave is 11~12V DC and each output wave is as follows.