Yamaha a 1000

Page 1

' STEREO INTEGRATED AMPLIFIER

A-1000

~ SERVICE MANUAL

I FRONT PANEL

YAMAHA run-A. um gun Wu um:

L I! =ll ll "" II!- a u w- w

I CONTENTS
T0 SERVICE PERSONNEL ................. 1
SPECIFICATIONS ....................... 'I
REAR PANELS ......................... 2
INTERNAL VIEW ....................... 3
DISASSEMBLY PROCEDURES ............. 3,4
ADJUSTMENTS ..................... . . . 4
BLOCK DIAGRAM ...................... 5
_ PRINTED CIRCUIT BOARD (Pattern side) . . .. . .6, 7
I SCHEMATIC DIAGRAM ................... a
( PARTS LIST ........................ 9 ~ 17

YAMAHA

NIPPON GAKKI CO, LTD. HAMAMATSJ . JAPAN
P'mIed m Japan 83.7. 2.0; 542 In C

Page 2

A-IOOO

.TO SERVICE PERSONNEL

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

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

I Meter impedance should be equivalent to (500 ohm
shunted by 0.15pF.

0 Leakage current must not exceed 0.5mA.

0 Be sure to test for leakage with the AC plug in both
polarities.

I SPECIFICATIONS

®

WALL
OUTLET

EQUIPMENT
UNDER TEST

D-

1::
INSULATING TABLE

4-

AC LEAKAGE TESTER
OR EQUIVALENT

E

Continuous Power Per Channel

20Hz~20kHz (000596 THD an) 120W
(Class A 10m
(000796 THD 5m 140W
1kH2 (0.005% THD 30) 130W
(0.005% THD 69) 150W
Power Band Width
003% THD 60W (80) (CHI ~100kHz
Damping Factor
1 kHI 8!). 90
Input Sensitivity/Impedance
Phono 1 MC 160uV/10kn, 100)?
MM 2.5mV/47kn 220pF
47kfl 330pF
1000
47m 390p): (G)
Phone 2 MM 150mV/47kn 220pF
Input Sensitivity (New lHF)
Phono MC 15w
MM 0.23mv
Aux, Tape, Tuner 14mv
Maximum Input Signal
1kHz,0.01%THD Phono MC 10mv
MM 165mV
Output Level/Impedance
Flee Out iSOmV/47Dn
Headphone Jack Rated Output/impedance
0.005% THD 0.89V/8SI
Frequency Response
20Hz ~20kHz Aux. Tape, Tuner +0
(Direct ON) -0.5dB
RIAA Equalization Deviation
Phone MC i0.3dB
MM 10.2dB
Total Harmonic Distortion
Phone MC to Her: Out (EV) 0.005%
Phone MM to Rec Out (3!) 0.003%
AUX. Tape, Tuner to SP Out sow/Sn 0.005%
Intormodulation Distortion
Aux, Tape, Tuner Rated Output/Sn 0.002%
1w/en 0.003%
signal to Noise Ratio (lHF-A-Nnt work)
Phone MC (soouv Input Shorted) sous
Phone MM (SmV Input shorted) 94dB
AUX, Tape, Tuner (Shorted) tOGdB

Signal to Noise Ratio (New lHF)

Phono MC 76da
MM 79d8
Aux, Tape, Tuner SSdB
input Equivalent Noise
Phono MC «145dBV
MM -138dBV
Residual Noise (lHF-A-Network) 125uV
Channel Separation
Phono MM (Input Shorted 1kHz, vol -30dB) 70dB
Aux, Tape (5.1m, 1kHz, vol-30:18) 65:13
Tana Control Characteristics
Bass boost/out 11 OdE (at ZOHZ)
turnover frequency 125, 500Hz
Treble boost/cut i1 mm (at 20kH1)
turnover frequency 2.5k, 8kHz

Filter Characteristics
Low (Subsonic)
High

15Hz, -12dB/oct
10kHz, -12dB/oct

Continuous Loudness Control (Level-related equalization)

Attenuation -20dB (at 1kH1)
Audio Mutino -20d5
Gain tracking error (0 to ~60dB) 2113
Power Supply

U.S. at Canadian models 120V AC, 60H:

General model

European model

110V/12DV/220V/240V AC, 50/60Hz

220V AC, 50H:

Australian model 240V AC, 50H:
Power Consumption 280W (U), (C), (Fl)
680W (A), (G)

AC Outlet (U), (C), (H)
Switched x 2
Unswitched x 1

Dimensions (W x H x D)

200W max total
200W max

435 x146 x 424.5 mm

(17'1/8 x 5-3/4" x 16-3/4")

Weight 13 it;
(28.7 lbs)

'Specificatian: are subject to change without notice.

(U) . . U.S.A. model (G) ..... European model

(C) Canadian model (Fl) ..... General model

(A) . . Australian model