Yamaha r 3

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STEREO RECEIVER

R-

SERVICE MANUAL.

MAMA mica-tum mm. In:

This mmuaI has

WARNING:

IMPORTANT:

Service Division.

IMPORTANT NOTICE

been provided for the use of authorized Yamaha Retailers and their service personnel.

It has been assumed that basic service procedures inhcrant to the industry, and more specifically Yamaha
Products, are already known and understood by the users, and have therefore not been restated

Failure to follow appropriate service and safety procedures when servicing this product
may result in personal iniury, destruction of expensive components and failure of the
product to perform as specified. For these reasons, we advise all Yamaha product owners
that all service required should he performed by an authorized Yamaha Retailer or the
appointed service representative.

The presentation or sale of this manual to any individual or firm does not constitute
authorization, certification, recognition of any applicable technical capabilities, or
establish a principloagent relationship of any form.

The data provided is believed to be accurate and applicable to the unitis) indicated on the cover. The
research, engineering, and service departments of Yamaha are continually striving to improve Yamaha
products. Modifications are, therefore, inevitable and changes in specification are subject to change without
notice or obligation to retrofit, Should any discrepancy appear to exist, please contact the distributor's

WARNING: Static discharges can destroy expensive components. Discharge any static electricity your
body may have accumulated by grounding yourself to the ground buss in the unit (heavy
gauge black wires connect to this buss).
IMPORTANT: Turn the unit OFF during disassembly and pins replacement. Recheck all work before
you apply power lathe unit.
I CONTENTS
T0 SERVICE PERSONNEL ............ . . . . . I ADJUSTMENTS . ....... . . . . . . . 5 ~8
SPECIFICATIONS...... ............. ....1 ICBLOCK . .......9/10
BLOCKDIAGRAM................ ..... 2/3 WIRING...... ..... ............I1
REAR PANELS . . . . . . ............ . . . . . . . 4 PRINTED CIRCUIT BOARD (Pattern side) . . . 12" 15
INTERNAL VIEW ................... . . . . 5 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . 16 ~ 18
DISASSEMBLYPROCEDURES ....... 5 PARTS LIST........... ........ ....1925

MC-Service

YAMAHA

NIPPON GAKKI CO LTD HAMAMATSU, JAPAN

2.5K~453 fl 6) Printed in Japan 85r3

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ITO SERVICE PERSONNEL

1. Critical Components Information.
Components having special characteristics are marked A
and must be replaced with parts having specifications equal
to those originally installed.

2. Leakage Current Measurement (For 120V Model Only).
When service has been completed, it is imperative that you
verify that all exposed conductive surfaces are properly
insulated from supply circuits.

0 Meter impedance should be equivalent to 1500 ohm shunted
by OJSuF.

e Leakage current must not exceed 0.5mA.
0 Be sure to test for leakage with the AC plug in both polarities.

I SPECIFICATIONS
I AUDIO SECTION

Continuous Power Per Channel

ZOHZ ~ ZOkHz, 0.04% TH D, 89. 35W (R) (UHC)
33W(G)(A)(B)
0.06% THD, 651 40W (RHUNC)

39W (G) (A) (B)

EQUIPMENT

UNDER TEST OR EQUIVALENT

@0-

WALL
OUTLET

DIN Standard Output Power Per Channel
1kHz,1% THD, 4:;

Dynamic Headroom

47W (GHAHB)

I

(Z:
INSULATING TABLE

I FM SECTION
Tuning Range 87.5 to 108.1MH2 (U)(C)(A)(B)(R)
87.5 to 108.0MHz (G)

50118 Quieting Sensitivity

Mono, 75S) 1.55uV (15.1dBf)

Stereo, 75m 21uV (37.7dBf)
Usable Sensitivity

Mono 0.81-IV (759) 9.3d3f

(30:18 Quieting)

an 1.88dB DIN Mono (SIN 26dB), 7551 1.4l-iV (G)
Power Band Width DlN Stereo (S/N 46cm), 75:? 30uV (G)
0.1% THD, SW 89 10H: ~40kHz Image Response Ratio
Damping Factor (98MH2) 4mg
1kHz,89 50 7533 (6)
Input Sensitivity/Impedance IF Response Ratio
Phono 2.5mV/47kfl (SBMHZ) SOdB
AUX/TAPE/CD 150mV/50k52 75:13 (G)
Input Sensitivity (New IHF) Spurious Response Ratio
Phono 0.42mv (SBMHz) 70dB
AUX/TAPE/CD 25mV AM Suppresion Ratio
Maximum Input Signal (I HF) 55:13
Phono, 1kHz, 0.01% THD 120mV Capture Ratio
Output Level/Impedance (IHF) 1.5d8
REC our 150mV/4.7kn Alternate Channel 85dB
Headphone Jack Rated Output/lmpedanoe Signal to Noise Ratio
0-55V/2350 (a: ssusi)
Frequency Response Mono 81:13
20H: N ZDkHz, AUX/TAPE/CD 10.5d8 Stereo 76dB
RIAA Equalization Deviation Harmonic Distortion
Phone 10.5dB Mono IkHz 0.1%
Total Harmonic Distortion Stereo lkHz 0.2%
Phono to Rec Out 3V 0.01% Stereo Separation
AUXITAPEICD to SP Out 17.5W/80 0.02% 1kHz 4mg
lntarmodulation Distortion Frequency Response
AUX/TAFEICD Rated Output/8n 0.04% 30Hz to 13kHz 0 i 0.5d8
Signal to Noise Ratio (li-lF-A-Networlt)
Phono (5mV Input Shorted) 88dB/82d8 (G) ' GENERAL
AUX/TAPE/CD (09) 103dB Power Supply
Residual Noise (IHF-A-Network) IOOuV 05- & Canadian Models 120v Ac. 6on
_ Ganeral Model 110V/120Vl220Vl240V AC
Channel Separation 55:13 50/60Hz
(HI Phono
. European Models 220V AC, SOHz
1' . c AuécrAlrlcfE: 52 British & Australian Models 240v Ac, 50H2
on on ro an GTIS IN
BASS boost/cut ilOdB (at 50Hz) PM" c°""""°" iswxlég;
turnover frequency 350Hz 260w (AHGI (a)
TREBLE boost/cut iIOdB (at 20kHz) AC 0
turnover frequency 3.5kHz "fl (UNCHR)
Filter Characteristils Swncl'IEd X 1 wow max
Bass Extension son. +8dB SW'WM " 1 200w max

Continuous Loudness Control (Level-related equalization)
Attenuation -40dB (at 1kl-lzl

I AM SECTION

Turning Range 520 to ISIOkHz (UNC)
522 to 161 'ikHz (GHAHB)

520 to1620kHz or 522 to 1611kHz (R)

Usable Sensitivity (IHF) 250uV/m
Selectivity 2MB
Signal to Noise Ratio SOdB
Image Response Ratio 40:18

Spurious Rosponse Ratio Better than 50dB
Distortion 0.5%

Dimensions (WxHxD) 435 x 126 x 289 mm

(174/ " x4»15/16" x11-3/ "I

Weight 5.2 kg (11 lbs 7 02)
(U) U.S.A. model (G) ..... European model

(C) Canadian model (B) British model

(A) Australian model (R) ..... General model

Specifications subject to change without notice.

AC LEAKAGE TESTER