Rotel RA 712 Service Manual

Page 1

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STEREO AMplifiER

RA-7I2

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TABLE OF CONTENTS

CHASSIS LAYOUT (TOP, BOTTOM VIEW) ........ 2
PRECAUTIONS ........................... 3
POWER AMPLIFIER BIAS ADJUSTMENT ......... 3
OVERLOAD PROTECTION LEVEL ADJUSTMENT . . 4
METER CALIBRATION ADJUSTMENT ........... 4
SCHEMATIC DIAGRAM ..................... 5
PHONO, MAIN AMP 81 POWER SUPPLY CIRCUIT
BOARD DIAGRAM._ ...................... 8

TONE CONTROL AMP CIRCUIT BOARD DIAGRAM . 9

-

PRE AMP CIRCUIT BOARD DIAGRAM ........... 9
VOLWME CONTROL AMP CIRCUIT BOARD

DIAGRAM ............................. Io
PHONO INPUT CIRCUIT BOARD DIAGAM ........ 10
TAPE MONITOR INPUT & OUTPUT CIRCUIT BOARD

DIAGRAM ............................. Io
TROUBLE SHOOTING ...................... 11
GAIN DIAGRAM .......................... 11

Technical manual

Page 2

34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.

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CHASSIS LAYOUT

82, Speakers Switch

VR604, Overload Protection Level Adj. (R-ch) e o a o a a
Volume Control

Treble Control

Bass Control a i "

0901, Requrator
V6603, Overload Protection level Adj (L-ch) -' c - . 7
F901,AC Fuse -: \ ' . 4
F904, Pilot Lamp Protector Fuse . , 3"" .
Sl , Function Selector Switch ' 7
C001, Smoothing Capacitor
0002, Smoothing capacitor
F903, Circuit Protector

F902, Circuit Protector

T001, Power Transformer
VR601, Bias Adj. (Lch)
0615, Power Transistor (L-ch)
Speaker-2 Terminal

0613, Power Teansistor (Lch)
Speaker-1 Terminal

L601 , Anti-Parasitic (L-ch)
VR605, Meter Adi. (L-ch)
0614, Power Transistor (Rch)
Monitor-2 Input &Output PCB

Monitor-1lnputandOutputDlNJack PCB a a e a a a @ ® @ 6

AUX Terminals (TOP V' EW)

Tuner Input Terminals

Phono Input Terminals

Phono Input DIN Jack PCB
0616, Power Transistor (Fl-ch)
L602, Anti-Parasitic (Rch)
VR602, Bias Adj. (Rch)
VR606, Meter Adj. (Rch)

93666 66

33, Power Supply Switch
J00] , Headphone Jack
M001 , Power Meter (L~ch)
M002, Power Meter (R-ch)
S7, Monitor-1, Switch

56, Monitor-2, Switch

35, LowAFil Switch

S4, Loudness Switch
Balance Control

Main Amp. PCB

Volune Control Amp. PCB
PRE Amp. PCB

Short Pin

Tone Control PCB
Voltage Selector

(BOTTOM VIEW)