Yamaha kx 930

Page 1

STEREO CASSETTE DECK

X-930

SERVICE MANUAL

WW mus-m MENU-Erwin! lore-ea .-

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WARNING:

capabilities, or establish a principle-agent relationship of any form.

discrepancy appear to exist, please Contact me disuibuior's Service Division,

WARNING:
buss in the unit (heavY gauge black wires connect to this bussl

IMPORTANT NOTICE

This manual has been provided for me use of aumorized Yamaha Reiailurs and their service personnel, I: has been assumed mar basic service vrocedurcs inherant to the
industry, and more specifically Yamaha Producls, are already known and undersiuorl by inc users, and have Therefore not been resiaced.

Failure to follow appropriale service and safety procedures when servicing fitis product may result in parsonal iniury, desituclion of expensive components
and failure of the product to pcrfnrm as spacified. For mese reasons, we advise all Yamaha product owners mat all while: required should be performed by
an amhorized Yamaha Retailer or the appointed service npresentadve.

IMPORTANT: The presematiun or sale of this manual to any individual ur firm does not constitute authorization, certification, recognition of any applicable mnhnical

The claca provided is believed up be accuraie and applicable to the unit(s) indicared on me cover. The research. engineering, and service deparunenis'pf Yamaha are conflnualiy
striving m improvc Yamaha product; Modifiranpns are, mererore, inevitable and specificauons are subject to change wiihout nofica or abligarion to IBLroflL Should any

Stanc discharges can dcsiroy expensive components. Discharge any slalic eleciricliy your body may have accumulacsrl by graunding yourself to are ground

IMPORTANT: Turn the unit. OFF during disassembly and pans replacement. Recheck all work before you apply power so me unlr.

I CONTENTS

TO SERVICE PERSONEL 1
SPECIFICATIONS
DIMENSIONS . .
INTERNAL VIEW
REAR PANELS .
DISASSEMBLY PROCEDURES
ADJUSTMENTS
u-COM DATA
TIMING CHART

IDUIMN-d

10~11
........12, 13

IC BLOCK
DISPLAY PIN CONNECTIONS
BLOCK DIAGRAM ..
PRINTED CIRCUIT BOARD
SCHEMATIC DIAGRAM
WIRING
PARTS LIST
REMOTE CONTROL TRANSMITTER

YAMAHA

YAMAHA CORPORATION HAMAMATSU. JAPAN
3.3K-813 [3.6) Printed in Japan '90.5

14,15

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KX-930

I TO 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 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.

- Meter impedance should be equivalent to 1500 ohm shunted
by 0.15 pF. '

- Leakage current must not exceed 0.5 mA.

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

- POLARIZATION
This product is equipped with a polarized alternating current
line plug (a plug having one blade wider than the other). This
plug will fit into the power outlet only one way. This is a saiety
feature. (U.C model only)

I SPECIFICATIONS

Track Configuration ......... 4 track, 2 channel stereo
Motor ................................ DC servo motor (capstan)
Flat torque DC motor (reel)

DC motor (assist)

Heads ................... Recording/Playback: Amorphous
with 12-Iaminated core

Erase: Double Gap Ferrite

Rapid Transport
F. Fwd/Flew (Normal) ....80 sec. (C-60)
. F. Fwd/flew (Fast) ...... .50 sec. (C-60)
Wow and Flutter
WRMS ............ 0.05%
W. Peak .. .....10.08%
Signal-to-Noise Ratio
Off .............. ...better than 61 dB

Dolby B on better than 69 dB

Dolby C on ...better tahn 77 dB
Frequency Response

Normal tape (-20 dB) ....... 20 - 18,000 Hz :3 dB

CrO2 tape (-20 dB) . ...20 - 20,000 Hz 13 dB

Metal tape (-20 dB) .......... 20 - 22,000 Hz 13 dB
Harmonic Distortion

(315 Hz, 3rd) ....................... Less than 0.7%
Input Sensitivity/Impedance .

Line .......................................... 60 mV/35 k-ohms
Output Level

Line ........ ...360 mV/l k-ohms

Phones .. 0.6 mW/8 ohms
Channel Separation (3150 Hz) .. ....40 dB
Cross Talk (125 Hz) ...................... ....55 dB
GENERAL
Power Supplies

U, C models ..... ...120 V, 60 Hz

G model 220 V, 50 Hz

A, B models .. ....240 V, 50 Hz

R model ........ ..110/120/220/240 V, 50/60 Hz

EQUIPMENT AC LEAKAGE TESTER
U NDER TEST 0R EQUIVALENT
® =D-
omtg. |:| J;
INSULATING TABLE
no

Dolby noise reduction and HX PRO headroom extension
manufactured under license trom Doly Laboratories Licensing
Corporation. HX PRO originated by Bang and Olufsen. Dolby",
the double-D symbol and HX PRO" are trademarks of Dolby
Laboratories Licensing Corporation.

Power Consumption ....................................... 18 W
Dimensions (W X H x D) ....... 435 X 122 X 275 mm

(17-1/8" x 4-13/16 X 10-13/16")
Weight ..................................... 4.9 kg (10 lbs. 12 oz)

* Specifications subject to change without notice.

U U.S.A. model
C. .Canadian model
A. .Australian model
G. .European model
B. .British model
B ..... General model
I DIMENSIONS
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