C, F2, H3, H4 Boards - Sony Trinitron KV-21V4A Service Manual

3-7. SERVO/SYSTEM CONTROL MICROPROCESSOR (MA BOARD IC501) PORT FUNCTION DESCRIPTION
Pin No. Signal I/O
1 RF SWP O RF switching pulse.
2 QVD O False VD.
3 QHD ENBL O False HD voltage level control.
4 AF REC P O Hi-Fi recording control. (Not used. (open))
5 REC P O Recording signal.
6 FE ON O Flying erase. (Not used. (open))
7 REC CTL I/O REC CTL.
8 CAP TRQ3 O Capstan current control.
*1 9 RENTAL I/O H : poor tape.
10 EDIT O EDIT control. (Not used. (open))
11 NA REC P I/O Normal audio recording mode. H : recording mode.
12 LP O H in LP mode.
13 CAMLOAD I/O
14 CAMUNLOAD I/O Loading motor rotaing direction control.
15 C IN/REC PRF O Cassette IN and erasing protection tad detection switch input.
16 HEAD CONT I/O Head change control.
17 T SENS I Tape top sensor input.
18 S SENS I Tape end sensor input.
19 MOD CONT O Modulator power supply ON/OFF control. (Not used. (open))
20 AV CONT O ON/OFF control. (Not used. (open))
21 ME SECAM I/O H : ME SECAM (Not used. (open))
22 SECAM I/O H : SECAM (Not used. (open))
23 VPB O Reverse VPB, H : P-OFF. (Not used. (open))
24 STEP PLS O Step pulse, H : Capstan step driving.
25 PAL 60 O H : HTSC on PAL TV.
26 3.58 NTSC O Tuner 'audio selection signal. H : 3.58 XTAL.
27 NTSC O H : PAL.
28 E TAPE O H : HG tape. (Not used. (open))
29 BIL O H output : BS bilingual mode. (Not used. (open))
30 C+CONT O CANAL + control. (Not used. (open))
31 CAM 12V O CAM motor voltage change.
32 END LED O Top/end detection lamp lighting control.
33 CAP TRQ 2 O Capstan current control signal 2. L : FF/REW to STOP.
34 CAP TRQ 1 O Capstan current control signal 1. L : SLOW speed down.
Function Pin No.
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
Signal I/O
PAL O H : PAL (Not used. (open))
FULL ERS O Full erase control. (Not used. (open))
A MUTE O Audio mute. H : mute.
CAP STOP O Capstan stop reversal. L : Capstan stop.
MP I Fixed to L.
ASURA RESET I System reset input.
VSS GND.
XTAL
EXTAL System clock 16MHz.
ASURA CS I Chip select signal.
SI BUS I
SO BUS O Serial communication signal.
S CLK I
DEST 2 I Destination judge input. Fixed to L.
AD I AD input for APC 2.
NTPB-SW I 358/443/onpal input.
AFSW POS I Hi-Fi switching position adjustment.
A VSS GND.
A VREF AD port reference input. (UNSW 5V)
A VDD UNSW 5V.
MODE 4 I Cam encorder data 4.
MODE 3 I Cam encorder data 3.
MODE 2 I Cam encorder data 2.
MODE 1 I Cam encorder data 1.
DEW I Condensation sensor input. "H" when condensation.
RF ENV I Video playback signal envelope.
AF ENV I Hi-Fi audio playback signal envelope.
RF SW POS I Video head switching position adjustment.
S REEL FG I S side reel FG input.
T REEL FG I T side reel FG input.
NT JUDGE I 4.43/3.58 judge input.
V SYNC I Composite sync input.
PB CTL I Servo CTL input.
DRM PG I Drum PG input.
Function
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