Onkyo A-8850 Service Manual

A-8850
IC BLOCK DIAGRAM
TMP47C440AN (Microprocessor) NG of S Saector
; 7 +5V
+5V Y 1
7 POWER
Z 3
4°
roweR
=
INPMUT
4
Z
1 REC MUT: $
Z
5
PHOTO
RECENNG
- u oF
YOL UP/DOWN { 8
3 POWER
SEL UP/DOWN { 10 STOPPAGE DET.
VW
P12 |
P13 |
| 14 |
= —
+5V o>— uk
Lon 18
Ln 19 |
>
ay +5V
op
Ld
Description
VAREF Analog reference voltage for A/D conversion
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
INPUT 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 oulput continuously in case of Input Selector TAPE-1, TAPE-2, DAT, and DIGITAL-4.
Control output terminal for PLAYER.
“L” will be output for 200ms if input K64 code for remote control and set Input Selector for
PHONO.
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”
(“H”).
When not moving, both outputs shall be “H” (Brake).
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”).
When not moving, both outputs shall be “H” (Brake).
Output terminal for switching digital signal.
Switch as follows through the position of Input Selector.
Input
DIGITAL-4
Others
(Analog)
14
EXP/JPN
Input
terminal
for
remote
control
initialization
when
energizing.
=4=

Onkyo A-8850 Specifications

General

Input Sensitivity (MM)	2.5 mV
Total Harmonic Distortion	0.008%
Input Sensitivity	150 mV (line in)
Dimensions	435 x 171 x 398mm (W x H x D)
Damping Factor	50
Signal to Noise Ratio (MM)	80 dB
Speaker Load Impedance	4 ohms minimum
Speaker Impedance	4Ω-16Ω
Tone Control	Bass, Treble