8 CIRCUIT OPERATIONS
8.1. VoIP BLOCK
The DSP, MAC, CODEC and the CPU are built into the VoIP (IC1).
The FLASH (IC3) and the SDRAM (IC4) are connected to the CPU. The contents of the FLASH are expanded to the SDRAM
at start-up. It also stores each setting.
If the LCD is not displayed in the operation but there is no problem on the LCD, then the failure of the CPU system memory (IC3
and IC4) should be considered, too.
8.2. LCD CIRCUIT
LCD data are outputted from pin138 of IC1 to LCD module.
IC12 is a converter circuit which outputs the voltage (+5V) necessary for LCD driving.
LCD contrast is set by electronic volume in the LCD module.
KX-NT265 uses a 16 characters x 1 line LCD.
8.3. RESET CIRCUIT
Reset signal is outputted from IC7 and inputted into IC1 and IC3.
11
KX-NT265X / KX-NT265X-B
Summary of Contents for KX-NT265X
Page 14: ...KX NT265X KX NT265X B 14 ...
Page 17: ...17 KX NT265X KX NT265X B ...
Page 18: ...9 TROUBLESHOOTING GUIDE 9 1 NO OPERATION 18 KX NT265X KX NT265X B ...
Page 19: ... Note Refer to waveform 1 3 and 6 in 17 4 WAVEFORM P 48 19 KX NT265X KX NT265X B ...
Page 20: ...20 KX NT265X KX NT265X B ...
Page 22: ...9 3 HANDSET DOES NOT WORK Receive Send 22 KX NT265X KX NT265X B ...
Page 23: ...9 4 HEADSET DOES NOT WORK Receive Send 23 KX NT265X KX NT265X B ...
Page 24: ...9 5 SPEAKER PHONE DOES NOT WORK Receive Send 24 KX NT265X KX NT265X B ...
Page 35: ...11 TERMINAL GUIDE OF ICs TRANSISTORS AND DIODES 35 KX NT265X KX NT265X B ...
Page 37: ...13 CABINET AND ELECTRICAL PARTS LOCATION 37 KX NT265X KX NT265X B ...
Page 38: ...14 ACCESSORIES AND PACKING MATERIALS 38 KX NT265X KX NT265X B ...
Page 50: ...IC13 pin2 DATA IC13 pin3 CLK IC13 pin4 LCK 13 LED CIRCUIT 50 KX NT265X KX NT265X B ...
