Onkyo A-8870

A-8870
IC BLOCK DIAGRAM
RECMUT
TMP47C440AN
(Microprocessor)
a
INPUT
a
2
0
SELECTOR
}
+5V
+5.6V
Q
TMP47C440AN
+5V o 1 BACKUP
2
Z 3
4, POWER INPMUT 4
L REC MUT: §
; 5
- 7
VOL UP/DOWN 8
:
SEL UP/DOWN 10
op
| 13 |
Lt |
| 6 |
45 6p— _—'!_hoxa
Ley 18 |
Le 8 |
Lepe= 20 |
Description
Analog reference voltage for A/D conversion
Analog reference GND for A/D conversion
Input Selector, Power key input terminal.
To read Input Selector and Power key by means of A/D conversion
Muting output terminal for Main amplifier input. Active “H”
Muting output terminal for Rec. output. Active “H”
To be output when switching Input Selector.
To be output continuously in case of Input Selector TAPE-1, TAPE-2, DAT, and DIGITAL-4.
Contro! output terminal for PLAYER.
PLAYER “L” will be output for 200ms if input K64 code for remote control and set Input Selector for
PHONO.
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”
VOL UP (“H").
When not moving, both outputs shall be “H” (Brake).
ie 2 ;
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”).
SEL UP When not moving, both outputs shall be “1H” (Brake).
{1
SI
;
a
Gor
Ae
aes
Output terminal for switching digital signal.
S2 Switch as follows through the position of Input Selector.
$3
Input
selector Output $3 Output $2 Output SI
DIGITAL-|
DIGITAL-2
DIGITAL-3
DIGITAL-4
Others
(Analog)
EXP/JPN Input terminal for remote control initialization when energizing.
—~4-