Rotel RA 212 Service Manual

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ROW-El;

RA-EIE

STEREO PRE/MAIN AMPLIFIER

TABLE OF CONTENTS

CHASSIS LAYOUT .................... 1
PRECAUTIONS ....................... 1
TROUBLE SHOOTING ................. 2
GAIN DIAGRAM ...................... 2
REPAIR PARTS LIST .................. 3
SCHEMATIC DIAGRAM ---------------- 4
PRE/MAIN AMP. & POWER SUPPLY

CIRCUIT BOARD DIAGRAM ----------- 5

:TECHNICAL MANUAL:

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CHASSIS LAYOUT in

S7, Power Switch

Bass Control

Headphone Jack

SS, Speaker 1 Switch

Treble Control

86, Speaker 2 Switch

34, Loudness Switch . 1

Balance Control ; I . . ,. _ .. 77

S3, Tape Monitor Switch

10. Volume Control

11. 52, Funtion Selector

12. 10401, Phone Amp. IC

13. S1, Phono lnput Selector

14. Phono Input Jack

15. IC601, Power Amp. IC, L-ch.

16- Input and Tape Monitor Out Ter-
minal

17. Tape Monitor Jack

18. ICGOZ, Power Amp. IC, R-ch.

19. F601, DC Fuse 3A

20. F901, AC Fuse, 1.5A (line 100V or 120V)

AC Fuse, 1A (line 220V or 240V)

PPNPWPSJNT

21. Speakers Terminal
22. AC Outlet 1 and 2
23. T001, Power Transformer

PRECAUTIONS

1. Always disconnect the chassis from the power line when 4. When mounting a replacement power Amp, IC, be sure

soldering. Turning the power' switch is not enough. that the bottom of the flange and the surface of the heat
Power line leakage passing through the heating element sink are free of foreign matter, for they may cause IC
may destroy lC's. failure.

2. Never attempt to do any work on the IC amplifiers 5. Silicon grease must be applied between the IC and the
without first disconnecting the AC line and waiting heat sink for better heat conduction.
until the power supply filter capacitor have discharged.

3. Before changing to a new Power Amp. 10 due to defects,
check whether the capacitor on its circuit is shorted out
or not and whether the output circuit (including speaker
system) is shorted out or not.