Rotel RA-312 User manual

POO T&L
RA=312
STEREO PRE/MAIN AMPLIFIER
TABLE OF CONTENTS |
“CHASSIS: LAYOUT 4 stirs te betes 1
PRECAUTIONS «+--+ cece ceeeeereeeeee 1
_ MAIN AMP. BIAS ADJUSTMENT - +--+ >>: 2
GAIN DIAGRAM ne a Ra ee ee ee, a Se ee ‘ 2
TROUBLE SHOOTING «+c eee cece eeee. £3
REPAIR PARTS LIST Sin ds hin aa beh Bg ae Mee ON a Ss 4
SCHEMATIC DIAGRAM <-+ +e eee errs 5
MONITOR CIRCUIT BOARD DIAGRAM --- 6
FILTER CIRCUIT BOARD DIAGRAM .---- 6
PRE/MAIN AMP. & POWER SUPPLY
CIRCUIT BOARD DIAGRAM -------++++: 7
“TECHNICAL MANUAL

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CHASSIS LAYOUT
NO RO PY AD PO ND Ad NO DN S@ | MR SS BR we wr RB WO oO
CONOR WNH RP ODDNAGTEWNH OO
St Se ee
S9, Power Switch
S2, Speaker Selector
Headphone Jack
Bass Control
‘Treble Control
S6, Loudness Switch
S7, High Filter Switch
Balance Control
S8, Low Filter
Volume Control
S5, Mode Switch.
S4, Tape Moniter-1 Switch.
S3, Tape Moniter-2 Switch.
S1, Function Selector
1C401, Phono Amp. IC.
Phono Din Jack
Q613, Power Amp. (L-ch)
Input Terminal
Q611, Power Amp. (L-ch)
Tape Monitor Din Jack
Tape Monitor Terminal
Q612, Power Amp. (&-ch)
Q614, Power Amp. (R-ch)
Speaker Fuse
F901, AC Fuse
Speaker Terminal 1 and 2
AC Outlet 1 and 2
TO0O1, Power Transformer
PRECAUTIONS
Always disconnect the chassis from power line when
soldering. Turning the power switch OFF is not enough.
Power line leakage passing through the heating element
may destroy the Transistors.
Never attempt to do any work on the transistor
amplifiers without first disconnecting the AC line cord
and waiting until the power supply filter capacitors have
discharged.
Replacement for output and driver transistors, if
necessary, must be made from the same hfe group as
the original type.
If one output transistor burns out (open or short)
8) D 6) @ B S B A) @ Ag) (8) G7) 46) 5) -
always remove all the output transistors in that channel
and check the bias adjustment, the control and other
parts in the network with an ohm-meter before inserting
a new transistor. All transistors in one channel will
be destroyed if the base biasing circuit is open on the
emitter end.
When mouting a replacement power transistor, be sure
that the bottom of the flange, the mica insulators and
the surface of the heat sink are free of foreign matter,
for they may cause transistors failure.
Silicon grease must be applied between the transistor
and the mica insulator, and between the mica insulator
and thé heat conduction.

MAIN AMP BIAS ADJUSTMENT
Instrument: DC Millivolt Meter
1. Rotate Volume Contro! to Counter-clockwise position — 3.
(minimum volume).
2. Connect the plus lead of DC millivolt meter to test 4.
point 4 @ (on Main Amp.PCB) and mimus lead to test
point 2 © .(for Right channel).
DC MILLIVOLT METER
ADJUST VR 601
AND VR 602 TO
OBTAIN A15mV
READING ON DC
MILLIVOLT METER
TP2 ¢
o TP4
Adjust VR602 (on Main Amp. PCB) to obtain a 15mV
reading on DC millivoit meter (no signal input).
Repeat the steps 2 and 3 as above for Left channel!
(Use test point3 © , 1 © and adjust VR601).
TPT
VR602
@)\
Fig. 1. Idling Current Adjustment Hook-up
GAIN DIAGRAM
TAPE OUT
@
ATT.
PHONO EQUALIZER AMP. QdB PRE-AMP.
MAG 2.58 mV
CER 130 mV
TUNER
1580mV = 15O0mV
AUX TAPE IN
150 mV
TONE CONTROL & MAIN AMP. 31dB
BOTH
CHANNEL
DRIVEN
© AUDIO SIGNAL 1,000Hz (SINE WAVE)

.
TROUBLE SHOOTING
Unit Inoperative
lf the pilot lamp does not illuminate, check the flow at
the AC Qutlet and
A. If no voltage across
1. The AC cord may be broken, or
2. Connections in the power switch may be faulty.
B. If there is proper voltage across check the AC fuse
F901 and
a. If the AC fuse is blown
1. Rectifier D901, 902, 903 or 904 may be
shorted, or
2. Capacitor C901, 902, 903, 904, 905 or 906
may be shorted, or
3. Primary or secondary winding of the power
transformer TO0O1 may be shorted.
b. If the AC fuse is normal.
1. Secondary winding of the power trans-
former may be opened.
lf the pilot lamp does illuminate, measure voltage
across +B, —B and B, (See schematic diagram) and
A. If no voltage across
1. Retifier D901, 902, 903 or 904 may be opened.
B. If there is proper voltage across, check the speaker
fuse and
a. If the speaker fuse is blown.
1. Transistor Q611- or 613 (Q612 or 614,
for R-ch) may be shorted, or
2. Transistor Q601, 603, 605, 607 or 609,
(Q602, 604, 606, 608 or 610 for R-ch)
may be faulty, or
3. Output cjrcuit (including speaker system)
may be shorted, or
4. The fuse may be worn out.
b.
If
the
speaker
fuse
is
normal
and
check
the
minus — point of C517 (C158 for R-ch)
i If there is no signal
1. Transistor Q501 (Q502 for R-ch) may be
faulty, or,
2.
Capacitor
C503,
505,
509
or
517
(C504,
506,
510,
or
518
for
R-ch)
may
be
faulty.
ii. If there is a signal.
1. Transistor Q601, 603, 605, 607 or 609
(Q602, 604, 606, 608 or 610 for R-ch)
may be faulty.
(3)
Only PHONO Section Inoperative
A. !C401 may be faulty, or
B. Capacitor C403, 405, or 413 (C404, 406, or 414 for
R-ch) may be faulty.
Hum and/or Noise
A. Hum and/or noise produced with Volume Control
set at Minimum.
1. Transistor Q501 (Q502 for R-ch) may be fauity,
or
2. Capacitor C503, 505, 509 or 517 (C504, 506,
510 or 518 for R-ch) may be faulty, or
3. Resister R507, 509 or 511 (R508, 510 or 512
for R-ch) may be faulty.
B. Hum and/or noise produced only in PHONO —
1. 10401 may be faulty, or
2. Capacitor C901, 902, 403 or 413 (C901, 902,
404 or 414 for R-ch) may be faulty.

REPAIR
PARTS
LIST
(4)
mba
|
teens
|
onermtoe
TRANSISTORS, DIODES AND IC’S OTHERS
Q501
|301201114|
2SC644(S),
Flat
Amp.
$1
601011268
|
Switch,
Function
Selector
Q502
|301201114|
2SC644(S),
Flat
Amp.
$2
601011264
|
Switch,
Speaker
Selector
Q601
|301001133!
2SA750(E),
Differential
Amp.
SS
611001636
|
Switch,
Tape
Monitor-2
Q602
|301001133!
2SA750(E),
Differential
Amp.
sh
1Set
Switch,
Tape
Monitor-1
Q603
|301001133|
2SA750(E),
Differential
Amp.
Sie
Switch,
Mode
Q604
|301001133}|
2SA750(E),
Differential
Amp.
S6
6140308111
Switch,
Londness
Q605
1301201155}
2SC1318(R},
Pre-driver
=|
1Set
Switch,
High
Filter
Q606
|301201155/|
2SC1318(R),
Pre-driver
$8
Switch,
Low
Filter
Q607
|301201132|
2SC1384(R),
Driver
S9
614010107)
Switch,
Power
Supply
Q608
|301201132)
2SC1384(R),
Driver
F901
|
341220015,
Fuse,
1.5A(line
100V
or
120V)
Q609
1301001123]
2SA684(R),
Driver
341220010]
Fuse,
1A
(line
220V
or
240V)
Q610
1301001123]
2SA684(R),
Driver
FOO1
|
341220025]
Fuse,
2.5A
(Speaker)
Q611
1301201142!
2SC789(Y),
Power
Amp.
FOO2
|
341220025]
Fuse,
2.5A
(Speaker)
Q612
1301201142!
2SC789(Y),
Power
Amp.
PLOO1
|
351140005!
Lamp,
14V,
50mA
Q613
1301201142}
2SC789(Y),
Power
Amp.
L601
|
228641105]
Anti-Parasitic
Q614
{301201142
|2SC789(Y),
Power
Amp.
|
L602
|
228641105)
Anti-Parasitic
D601
|300212006
|
SV-04,
Temperature
Compensator
T001
|
205001388)
Transformer,
Power
Supply
(Multi-
D602
1300212006
|
SV-04,
Temperature
Compensator
Voltage
Type)
D603
1300919021
|
SU-1-02,
DC
Balance
Regurator
204001388!
Transformer,
Power
Supply
(Line
D901
1300919017)
Hi-Fi
SPECIAL,
Rectifier
100V
or
120V)
D902
13009190171
Hi-Fi
SPECIAL,
Rectifier
206001388)
Transformer,
Power
Supply
(Line
D903
|300919017]|
Hi-Fi
SPECIAL,
Rectifier
220V
or
240V)
D904
1300919017]
Hi-Fi
SPECIAL,
Rectifier
141610276
|
Pre/Main
Amp.
Circuit
Board
Assembly
1C401
1303452152}
RC-4558(DN),
Phono
Equalizer
Amp.
(without
Power
Transistors
and
Heat
VARIABLE
RESISTORS
sink)
141710276
|
Monitor
Circuit
Assembly
“TC-115-ST”
ee
uote
eee
cine
ere
141710275
|
Filter
Circuit
Assembly
“TC-114-ST”
VR502 (525121129
100KBX2, Volume Control
VR503 |525101128] SOKBX2, Treble Control
VR504 [525101128] SOKBX2, Bass Control
VR601 1510502126] 10KB, Idling Current Adj. (L- ch)
VR602 1510502126] 10KB, Idling Current Adj. (R-ch )
ROLAND ELECTRONICS CO., LTD.
ROTEL ELECTRONICS CO., LTD.
ROTEL OF AMERICA, INC.
1—36—8 OHOKAYAMA, MEGURO-KU, TOKYO, JAPAN
310 SEC. 5, NANKING E. ROAD, TAIPEI, TAIWAN
2642 CENTRAL PARK AVE., YONKERS, N.Y. 10710, U.S.A.
Printed in Taiwan Feb. ‘76

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