Diagrams; System Control Board Ic801 M38172M4-150Fp (System Control); 5-1. Ic Pin Function Description - Sony tc-tx77 Service Manual

5-1. IC PIN FUNCTION DESCRIPTION

SYSTEM CONTROL BOARD IC801 M38172M4-150FP (SYSTEM CONTROL)

Pin No. Pin Name I/O
1 METER-R I
2 METER-L I
3 KEY-Y I
4 KEY-X I
5 FWD-TAB I
6 CHROM SW I
7 RVS-TAB I
8 METAL SW I
9 PLAY SW I
10 TEST MODE I
11 POWER OUT O
12 POWER DET I
13 CLOSE O
14 OPEN O
15 — —
16 — —
17 — —
18 — —
19 — —
20 — —
21 CLOCK O
22 DATA I/O
23 RELAY O
24 BIAS O
25 AU BUS-OUT O
26 AU BUS-IN I
27 RESET I
28 X CIN I
29 X COUT O
30 X IN I
31 XOUT O
32 Vss —
33 REC MUTE O
34 LINE MUTE O
35 — —
36 PB MUTE O
37 REC/PB O
38 DOLBY B/C O
39 DOLBY ON/OFF O
40 — —
41 — —
42 — —
43 CD SYNC O
44 P17 O
45 P16 O
46 P15 O
SECTION 5

DIAGRAMS

Digital peak level meter signal input (R-ch)
Digital peak level meter signal input (L-ch)
Key input (A/D convert input) *1
Record proof detection input from S902 (FWD side) "H": Not nail
Tape type detection input from S903 "L": Type I
Record proof detection input from S904 (REV side) "H": Not nail
Metal cassette detection input from S906
Playback and stop detection input from S907 "L": Playback
Test mode terminal Normal: "H" Test mode: "L"
Audio and mechanism power on/off output "L": Off
Primary power on/off input "H": On
Loading motor (M901) drive output *2
Not used (Fixed at "L")
Clock signal output to back-up memory (IC803)
Data signal input/output to back-up memory (IC803)
Relay drive output "L": On
Control output to recording bias switch (Q352) "L": On
Audio bus output
Audio bus input
Reset input
Not used (Fixed at "L")
Not used (Open)
Main system clock input (4 MHz)
Main system clock output (4 MHz)
Ground
Recording mute on/off control output "L": Mute on
Line mute on/off control output "L": Mute on
Not used (Fixed at "L")
Playback mute on/off control output "L": Mute on
Mode control output to DOLBY NR amplifier (IC301) When recording: "L"
DOLBY B/C select signal output "L": DOLBY C, "H": DOLBY B
DOLBY on/off select signal output "L": DOLBY On, "H": DOLBY Off
Not used (Open)
Not used (Open)
Not used (Open)
Control output to CD SYNC LED (D851)
Segment signal output to fluorescent indicator tube (FLT851)
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Function