Ic Block Diagram - Onkyo A-809 Service Manual

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IC BLOCK DIAGRAM
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Pin No. Symbol Description
1 VAREF Analog reference voltage for A/D conversion
2 VASS Analog reference GND for A/D conversion
3 KEY Input Selector, Power key input terminal.
: To read Input Selector and Power key by means of A/D conversion
4 INPUT Muting output terminal for Main amplifier input. Active "H"
Mating output terminal for Rec. output. Active "H™
5 RECMUT To be output when switching Input Selector.
To be output continuously in case of Input Selector TAPE-1, TAPE-2, DAT, and DIGITAL-4.
Control output terminal for PLAYER.
6 PLAYER "L" will be output for 200ms if input K64 code for remote control and set Input Selector for
PHONO.
7 VOL DOWN UP/DOWN output terminal for volume. Active "H"
In case of UP (DOWN), VOL UP outpout will be "H" ("L"), while VOL DOWN output will be "L"
8 VOL UP CH").
When not moving, both outputs shail be "H" (Brake).
9 SEL DOWN UP/DOWN output terminal for Input Selector. Active "H" In case of UP (DOWN), SEL UP output
will be "H" ("L"), While SEL DOWN output will be "L" ("H").
10 SEL UP When not moving, both outputs shall be "H" (Brake).
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Output terminal for switching digital signal.
12 S2 Switch as follows through the position of Input Selector.
13 83
Input
3 2
éeletor Output S. Output S: Output SI
DIGITAL-1 ti L L
DIGITAL-2 L L H
DIGITAL-3 L H L
DIGITAL-4 L H H
Others
(Analog) H Ht e
14 EXP/JPN Input terminal for remote control initialization when energizing.