Rotel RA 820AX Service Manual
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Extracted text from Rotel RA 820AX Service Manual (Ocr-read)
Page 1
TECHNICAL MANUAL
Oual/ty Uncomprormsed
RDTEU
RA-820AX
STEREO INTEGRATED AMPLIFIER
TABLE OF CONTENTS
Chassis Layout .......................................... 1
Adjustment ................................................ 1
Schematic Diagram ........................................... 2
Wiring Diagram ................................................. 4
Printed Circuit Boards ....................................... 5
PC Board Assy Parts List ............................... 6
THE HOTEL OO.. LTD.
1 36 8 OHOKAYAMA, MEGURO KU TOKYO 152, JAPAN
HOTEL ELECTRONICS CO LTD.
ROTEL BLDG.. 3F, NO 35, FUSING N ROAD, TAIPEI, TAIWAN, REPUBLIC OF CHINA
Page 2
Chassis Layout
REMOVE SPEAKERS DIRECV MAIN SPEAKERS
XL @Mfl M n
W 9:11
U:DF902
EFS°:'U a. 0903 a-
0 ":1 ._ - {2 [cm
05s YP3
[J 0615
0902
06} VRBOI *
.B-as Ad] 090: 0502
052 0601 O
as
I] c:
°°°° (35 om TH- F 53
o A :1
0512 F602 Dos" 7 09m A
om 050 O
E, :1 O
0603
am .
vasoz 0602 Dem
osoz
.B-asAd: *1 O o
0620 0&2! 0606 0000
t 0616 0904
» 0505 006:0
U D * :1
- I
3 TF2 TP |:]
ICSOI
T3423 TX-LB7
1-1 [-1 [fl f-I
L4 WWW
SPEAKE R
POWER WES REMOVE BASS TREBLE BALANCE VONE MONIYOR FUNCTION VOLUME
Power Amplifier Bias Adjustment
Instruments: DC mllli-voltmeter
Notes: Prior to Bias Adjustment, run about 5 minutes with rated output (8 ohm) and warm up Power Transistor and Heat Sink.
Set Volurhe Contro| to Minimum.
Coupling
Step Adjust Adjust for
Plus Lead Minus Lead
1 TP1 TP3 VR601 . .
DC mum-voltmeter
reads 4 mV
2 T92 TP4 VR602