Yamaha jx35b service manual

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SERVICE MANUAL

.FRONT PANEL

YAMAHA

JX saunas

@5- O@

.CONTENTS

SPECIFICATIONS ....................... 1 PRINTED CIRCUIT BOARD ............... . 3
GENERAL ADJUSTMENT AND CHECK ........ 1 SCHEMATIC DIAGRAM .................. . 4
BLOCK DIAGRAM ...................... 3

SINCE 1857

YAMAHA

NIPPON GAKK .. LTD, HAMAMATSU.JD~PAN
005520 Prmled In Japan 6.82 In@ wk

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JXSSB

ISPECIFICA

TIONS

OUTPUT POWER
INPUT SENSIVITY (at

30W (89 T.H.D. 3%)
1 kHz)

POWE H CONSUMPTION

US & Canadian models 40W 0.5A
General model 65W

120V ACfixed,or110, 130, 220 or

E0. VOL HIGH >39dBl 9mv) POWER SOURCE
VOLUME} "3 Low -27dB (35mV) 240v AC selectable,50/60Hz
INPUT IMPEDANCE HIGH 34o kn DIMENSIONS 544 x 695 x 300 mm
LOW so kn (WxHxD) (21-3/8" x 27-3/8" x 11-7/8")
-55dB (VOLUME ->mIn.I WEIGHT 23.5 kg (51 lbs.)

NOISE

-35dB (VOLUME 9max.)

HEADPHONE JACK
SPEAKE R

-8dB (03V) @ 30W 8n
YAMAHA JA3808 (389m) x1

Specifica

(MB is referenced to 0.775 V HMS.
tian subject to change without notice.

.GENERAL ADJUSTMENT AND CHECK SPECIFICATIONS

For the measurements, use an oscillator with an output impedance of below 1kfl, an oscilloscope and an AC voltmeter/
dB meter with an input impedance of over IOOkQ.

I. GENERAL ADJUSTMENT
Oldling Current Adjustment

Adjust the pot (65000) so that the voltage across the
terminals TP1 (+) and E (-) on PM circuit board is

set to 5mV i 1mV.

*When readjusting all over again (e.g. when replacing
the power transistor), make sure to turn the pot full

counterclockwise.

Idling Current
5mV t 1mV

__l

l

r.
l

-'I(-l @]
HI -| TME El]
5
TP1 @ E] D
IDLE ADJ. TF3 CE:
El
TP2
HIGH LOW u u U U u
LINPUT-l VOLUME MIDDLE TREBLE BASS COMPRESSOR HEADPHONE

Fig.1