Aiwa NSX-SZ900 Service Manual page 34

IC DESCRIPTION
IC, LC876670B–5V72
Pin No. Pin Name
1 I–SUBQ
2 O–BUZ
3 O–MOTOR
4 O–SOL1
5 O–SOL2
6 O–RSM–CE
7 O–HSP
8 O–PANORAMA
9 O–MUTE
10 O–CLK–SFT
11 RESET
12 I–DISH
13 I–SPEANA / I–MS
14 VSS1
15 CF1
16 CF2
17 VDD1
18 I–HOLD
19 I–KEY1
20 I–KEY2
21 I–KEY3
22 I–CDSW
23 I–RT–VR
24 I–RT–JOG
25 I–MIC
26 I–TM–BASE
27 O–CD–DATA
28 O–POWER
29 I-RMC
30~41 G12~G1
42~45 P35~P32
46 VDD3
47 SPEANA–A / P31
48 SPEANA–B / P30
49 SPEANA–C / P29
50 I–HPMUTE / P28
51 –VP
52 I–STEREO / P27
53~56 P26~P23
57 BEAT–M / P22
58 KCON / P21
59 DSP / P20
I/O
I CD sub-code input.
O Touch-sensor beep sound output. (Not used)
O Tape motor ON/OFF.
O Tape 1 plunger ON/OFF.
O Tape 2 plunger ON/OFF.
O Rhythm IC chip enable output.
O PLL-IC chip enable output.
O Panoramic IC data output.
O Mute output. Mute ON/OFF.
O System microcomputer clock shift ON/OFF output.
— System reset.
I CD turn-table position detection AD input.
I Spectrum analyzer level / MS input. AD input.
— Connected to GND.
I Oscillator circuit input.
O Oscillator circuit output.
— Connected to power supply.
I System power observation AD input.
I KEY 1 AD input.
I KEY 2 AD input.
I KEY 3 AD input.
I CD mechanical switch AD input.
I VOLUME rotary encoder AD input.
I JOG rotary encoder AD input.
I Auto VF microphone input. Small signal detection (MIC IN) input.
I Time base input.
O CD data output.
O System power ON/OFF output.
I Remote-control signal reception input. Active at "L".
O FL grid G12~G1 output.
O FL segment P35~P32 output.
— Connected to power supply.
O Spectrum analyzer band switching output A / FL segment P31 output.
O Spectrum analyzer band switching output B / FL segment P30 output.
O Spectrum analyzer band switching output C / FL segment P29 output.
I/O Headphone MUTE input / FL segment P28 output.
— Power supply for FL display.
I/O Tuner stereo detect input / FL segment P27 output.
O FL segment P26~P23 output.
I/O Beat master diode input / FL segment P22 output.
I/O KCON enable diode input (Not used) / FL segment P21 output.
I/O DSP enable diode input / FL segment P20 output.
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Description