Sony MDX-C8900R, Service Manual

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Pin No. Pin Name I/O Function
31 TIR-IND O LED drive signal output of the TIR indicator (LED701) “H”: LED on
32 LCDINH O Blank indicate control signal output to the liquid crystal display driver (IC900) “L”: no display
33 VSS — Ground terminal
34 C —
Connected to coupling capacitor for the power supply
35 AD-ON O
A/D converter power control signal output When the KEYACK (pin
&§
) that controls reference
voltage power for key A/D conversion input is active, “L” is output from this terminal to enable
the input
36 RE-IN0
I
37 RE-IN1
I
38 DVCC —
Power supply terminal (+5V) (for D/A converter)
39 DVSS —
Ground terminal (for D/A converter)
40 SD-IN
I
Station detector detect input from the FM/AM tuner unit (TU1)
Stop level for SEEK, BTM, etc. is determined SD is present at input of “H”
41 LCDANG
O
View field angle control signal is output when front panel is fully opened
“H”: front panel is fully opened
42 AVCC —
Power supply terminal (+5V) (for A/D converter)
43 AVRH
I Reference voltage (+5V) input terminal (for A/D converter)
44 AVRL
I Reference voltage (0V) input terminal (for A/D converter)
45 AVSS —
Ground terminal (for A/D converter)
46 KEYIN0
I
Key input terminal (A/D input) (LSW900, S900, LSW901 to LSW908) OFF, SEEK/AMS 0
=
– +
+ )
, MODE, SOURCE, SOUND, DSPL, SHIFT, 1, 2, 3 keys input
47 KEYIN1
I
Key input terminal (A/D input) (LSW701, LSW909 to LSW918)
6
, LIST, AF/TA, TIR, 10, 9, 8, 7, 6, 5, 4 keys input
48 RC-IN0
I Rotary remote commander key input terminal (A/D input)
49 VRSW O
Power on/off control signal output for the RSC-164 (IC901), flash memory (IC902) and program
ROM (IC903) power supply “H”: power on
50 DSTSEL1 I
Destination setting terminal (fixed at 1/4 voltage)
51 DSTSEL2
I Destination setting terminal (fixed at “L”)
52 MTP
I Multi-path input from the RDS decoder (IC701)
53
VSM I FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU1) (A/D input)
54 VCC —
Power supply terminal (+5V)
55 RAMBU I
56 POWSEL I Power select switch (SW500) input terminal “L”: on (operation mode), “H”: off (halt mode)
57 EQ-SEL I Not used (fixed at “H”)
58 TESTIN I Setting terminal for the test mode “L”: test mode, Normally: fixed at “H”
59 DOOR-IND O
LED drive signal output of the illumination LED (LED702, 703) “H”: LED on
“H” is output to turn on LED when front panel is opened
60 TIR-PLAY O AM/TIR selection signal output to the IC704 “L”: AM signal, “H”: TIR signal
61 SUB-SW1 O Sub woofer output cut-off frequency select signal output terminal
62 SUB-SW0 O Sub woofer output cut-off frequency select signal output terminal
63 VSS — Ground terminal
64 VOLCE O Chip enable signal output to the main electrical volume (IC400) “H”: active
65 ATT O Audio line muting on/off control signal output terminal “H”: muting on
66
VOLSO/
SUBSO
O Serial data output to the main electrical volume (IC400) and sub electrical volume (IC403)
67
VOLCKO/
SUBCKO
O
Serial data transfer clock signal output to the main electrical volume (IC400) and sub electrical
volume (IC403)
Dial pulse input of the rotary encoder (RE900)
(for VOLUME/BASS/TREBLE/BALANCE/FADER control)
Internal RAM reset detection signal input from the RN5VD33AA (IC503)
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset