Onkyo K-505TX, Service Manual

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MICROPROCESSOR TERMINAL DESCRIPTIONS
Pin I/O Terminal Description Pin I/O Terminal Description
No. No.
1 O GRID2 33 O CAPSTAN Capstan control
Grid output pin Active high
2 O GRID1 34 O SOLENOID Solenoid control
Active high
3 O SEG1 35 O OPEN
Door control.
4 O SEG2 36 O CLOSE
5 O SEG3 37 I RSENSOR Rotate sensor
6 O SEG4 38 I RIIN System code input pin
7 O SEG5 Segment output pin 39 O RIOUT System cord output pin
Active low
8 O SEG6 40 I CLOSESW Door close detect.
Active low
9 O SEG7 41 I OPENSW Door open detect.
Active low
10 O SEG8 42 O RECMUTE REC Mute control.
Active high
11 O SEG9 43 O DOLBYRESET Dolby IC reset.
Active low
12 O STBYLED Control of Standby LED 44 O 400Hz/12kHz Switched 400Hz/12kHz
OSC port.
Active high
13 O FILAMENT Switched Filament 45 O OSCOUT Osc output 400Hz/12kHz
Active high
14 I DCHECK Door open 46 O LINEMUTE Line muting.
Active low
15 I POFF Power failure port. 47 O 70/120 Tape select port.
16 I PRECINHSW Cassette pack detect 48 O REC/PB Mode select port.
17 I METALSW Metal switch detect 49 O BIAS Bias select
Low when metal Active high
18 I FRECINHSW Cassette pack detect 50 I LEVELLCH A/D Control for input level (Lch)
19 I VKK Power supply for display 51 I LEVELRCH A/D Control for input level (Rch)
20 O CLOCK Control for EEPROM 52 I KEYIN4
21 I SIN Data input for EEPROM 53 I KEYIN3
A/D Control
22 O SOUT Data output for EEPROM 54 I KEYIN2
23 O CS Chip select for EEPROM 55 I KEYIN1
Active high
24 O STB Standby port 56 VASS Ref. voltage for A/D comparater
Active high GND
25 TEST Connect to GND 57 VAREF Ref. voltage for A/D comparater
+5V
26 VSS Connect to GND 58 VDD
27 I XIN Clock OSC (8kHz) 59 O GRID8
28 O XOUT Clock OSC (8kHz) 60 O GRID7
29 I RESET System reset 61 O GRID6
Grid output pin.
30 I PACKSW Cassette detect switch 62 O GRID5
31 I HIGHSW High switch detect. 63 O GRID4
High when highposition
32 I PLAYSW Play switch detect. 64 O GRID3
Low when playback
K-505TX