CIRCUIT DESCRIPTION
Pin
No.
Pin Name
I/O
Description
48
PRE2.RLY
O
Preout 2 relay
49
SW.RLY
O
Sub woofer (SW) ch. relay
50
S.RLY
O
Surround (SL,SR) ch. relay
51
C.RLY
O
Center (C) ch. relay
52
F.REY
O
Front (FL,FR) ch. relay
53
L.RLY
O
Source direct relay
54
VOL.ATT
O
Volume attenuator
55
VOL.ST4
O
Preout1 FL/RFch volume IC (TC9212F) strobe
56
VOL.ST3
O
Preout 1 LS/RS ch.volume IC (TC9212F) strobe
57
VOL.ST2
O
Preout 1 C/SW ch. volume IC (TC9212F) strobe
58
VOL.ST1
O
Preout 2 FL/FR ch. volume IC (TC9212F) strobe
59
VOL.CK
O
Preout 1,2 volume IC (TC9212F) clock
60
VOL.DT
O
Preout 1,2 volume IC (TC9212F) data
61
A.ST3
O
Tone IC (TC9274F) strobe
62
A.ST2
O
Input selector (TC9162AF/TC9163AF/TC9164AF) strobe
63
A.ST1
O
Tape2 input IC (TC9164AF) level strobe
64
A.CK
O
Tone (TC9274F) /input selector (TC9162AF/TC9163AF) /tape 2(TC9164AF) clock
65
A.DT
O
Tone (TC9274F) /input selector (TC9162AF/TC9163AF) /tape 2(TC9164AF) data
66
P.RLY
O
Power relay
67
LED.ST2
O
LED control IC (NJU3713D) strobe
68
LED.ST1
O
LED control IC (NJU3711D) strobe
69
LED.CK
O
LED control IC (NJU3711D/NJU3713D) clock
70
LED.DT
O
LED control IC (NJU3711D/NJU3713D) data
71
VSS
GND
72
VOL.CW
O
Volume rotary encoder CW (A port)
73
VOL.CCW
O
Volume rotary encoder CCW (B port)
Key return 0-3
Key scan 0-3
Not used
Not used
Not used
Not used
Not used
Not used
Tuner mute
Tuner unit PLL IC (LC7218) chip enable
93
T.CK
O
Tuner unit PLL IC (LC7218) clock
94
T.DT
O
Tuner unit PLL IC (LC7218) data in
95
T.ST
I
Tuner stereo
96
T.SD
I
Tuner SD
97
T.DO
I
Tuner unit PLL IC (LC7218) data out
98
V2.INH
O
VCR IC 2 (TC4052) inhibit port
99
V3.SW3
O
VCR IC 3 (NJU2279D) switch 3 port (monitor mute)
H : MUTE OFF
L : MUTE ON
100
V3.SW2
O
VCR IC 3 (NJU2279D) switch 2 port
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