Service manual

35
HCD-NEZ30
Pin No.
Pin Name I/O Description
46 O-POWER O
Power relay drive signal output terminal "H": on
47
I-SUFFIX I Model destination setting terminal
48 I-RE-VOL
I Dial pulse input of the rotary encoder (for VOLUME control)
49
I-MP3-REQ I MP3 data request signal input from the CD DSP
50
I-MP3-ACK I MP3 acknowledge signal input from the CD DSP
51 to 53
MD2 to MD0
-
Not used
54 RESET I
Reset signal input from the reset switch "L": reset
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
55
O-TU-CE O Chip enable signal output to the tuner (FM/AM)
56
O-TU-CLK O serial data transfer clock signal output to the tuner (FM/AM)
57
O-TU-DI O Serial data output to the tuner (FM/AM)
58 VLCD -
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
59 to 62 COM0 to COM3 O Common drive signal output to the liquid crystal display
63, 64
SEG0, SEG1
O
Segment drive signal output to the liquid crystal display
65 VCC -
Power supply terminal (+3.2V)
66
GND - Ground terminal
67 to 89
SEG2 to SEG24
O
Segment drive signal output to the liquid crystal display
90 VCC -
Power supply terminal (+3.2V)
91
VSS - Ground terminal
92 XI I
Main system clock input terminal (4.19 MHz)
93 XO O
Main system clock output terminal (4.19 MHz)
94 to 100
SEG25 to SEG31
O
Segment drive signal output to the liquid crystal display