Yamaha a 500

Page 1

YAMA-OO1 33

STEREO INTEGRATED AMPLIFIER

AGSQQ

SERVICE MANUAL

I FRONT PANEL

0 POWER SWITCH 9 TREBLE CONTROL

9 SPEAKER SELECT SWITCHS 0 LOUDNESS CONTROL

OAUDIO MUTING SWITCH (D BALANCE CONTROL

0 INPUT SELECTORS In SUBSONIC FILTER

9 VOLUME CONTROL m MODE SWITCH

6 HEADPHONES JACK (E PHONO SELECTOR

a BASS CONTROL G) REC OUT SELECTOR

I CONTENTS

To SERVICE PERSONNEL ............................................................ 1

SPECIFICATIONS .............. . ...................... . . . .................... .. . .. 1

REAR PANELS ......... . ............ . ............................................ 2

INTERNAL VIEW ............................................ . .................... 3

DISASSEMBLY PROCEDURES .................................................... . . 3/4

ADJUSTMENTS ........................................................... . ...... 5

BLOCK DIAGRAM ................................................................ 5

PRINTED CIRCUIT BOARD ................................................. . . . ...... 6

WIRING DIAGRAM . . ........... . ........................................... . . .. . .. 7

SCHEMATIC DIAGRAM ................... . ......................................... 8
SINCE 1887 . YAMAHA

NIPPON GAKKI cu, LTD. HAMAMATSU. JAPAN

II.azfl@2.5k

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A-SOO

I TO SERVICE PERSONNEL
(Prepared in accordance with UL Standard 1270)

Before service of this appliance by you, please carefully read this service manual.

Please make Leakage~current or Resistance measurements by suitable meter to determine that expOsed

parts are acceptably insulated from the supply circuit before returning the appliance to the customer.
LEAKAGE CURRENT MEASUREMENT CIRCUITS

APPLIANCE

METER

2D:

Jfi

I
GH
(cnounomc) ii
OPEN INSULATING
TABLE

GROUND SUPPLY CONDUCTOR B

Appliance intended for connection to a 120 volt power supply

A PROBE WITH SHIELDED LEAD.

B SEPARATED AND USED AS CLIP WHEN MEASURING CURRENTS FROM

ONE PART OF APPLIANCE TO ANOTHER.
1firrn that the leakage current is not more than 0.5mA

I SPECIFICATIONS
Continuous Power Per Channel Signal-toNoise Ratio INEW IHFl
20H: ~20kHz Phono MC 74118
(0.01% THD, an) 70W MM 7845
um: (0.01% TH D, an) 75W AUX» Tape Tun" 8MB
DIN Standard Output Power Residual Noise (lHF-A-Networkl 140pV
Per channel Channel Separation
1kHz (1% THD, an) 75W (GllBllAl Phono MM Input Shorted lkHz 55dB
pow" Bandwidth Aux, Tape 5.1km 1 kHz SudB
0.03% TH D 35w (8.0.) 10H: ~ 50kHz Tone Control characteristics
Damping Factor Bess boost/cut $1068 (at ZOHz)
1kHz 8n better than 50 Bass turnover frequency 350Hz
Input Sensitivity/Impedance Treble boost/cut nose (It ZDkHzl
Phonu MC 160pV/1009. Treble turnover frequency 3.5km
MM 2.5mV/47kfl Filter Characteristiu
Aux, Tape, Tuner 150mV/47kfl Low (Subsonicl 15H: -12dB/oct
Input Sensitivity (New IHF) . Continuous Loudness Control
Phono MC ISA-IV (Level-related equalization)
MM 0.3mV Attenuation 20113 (at IkHzl
Aux, Tape, Tuner 18mV Audio Mutiny -20tIB
Maximum Input Signal Gain Tracking Error (0 to -60dBl 2:13
0.01% TH D Phono MC 10mV Power Supply
MM 150mV U.$.A. 8t canadian models AC 120V, 60Hz
Output Level] Impedance General model AC 110l120/220/24OV,
REC Out 150mV/47OIZ EO/SOHZ
Headphone Jack Rated Output/ impedance British and Australian models ACZ4DV, 50H:
0.01% TH D 85'! 0.68V/270fl European model ACZZOV, 50H:
Frequency Response 0 Power consumption 275WI380W (GHBHA)
Aux, Tape, Tuner 20H: ~ 20kI-Iz. iosdB AC Outlet
RIAA Equalization Deviation Switched x 2 200w max.
Ph°n° MC 10353 Unswitched x 1 200w max.
MM -263 Dimensions (w x H x D) 435 x 112 x 327mm
Total Harmonic Distortion (17-1/3xk2/5x12-7/8)"
Phono MC to Flee Out l3Vl 007% Weight 7.3kg (15.1 lbsl
MM to Flee Out l3Vl 0.003%
AUX. Tape, Tuner to SD Out
(1WI8m . @005" (A) . . . . Australian model
Intarrnodulation Distortion (GI . . North European model anly.

Aux. Tape. Tuner Rated Output/8n 0.01%
1w/srz 0.005%
Siflnil-tovNoiso Ratio
IlHF-A-Network)
00 MC (SDOpV Input Shortedl 76:13
MM (5mV Input shorted) szda
Aux. Tape. Tuner (5.1km lOOdB

(Bl ..... British model only.

' Specification: subject to change without notice.