Jvc KSFX 12 WT Service Manual

Page 1

KS-F150
KS-FX12

J SERVICE MANUAL

KS-FX1 2
KS-FX1 2WT
KS- F1 50

SYSTEM CPU
LC72362N

HEAD AMP
UPC1228HA

PLAYBACK HEAD
1 0036-701 BS

Area Suffix Area Suffix Area Suffix
[KS-F150] [KS-FX12WI] [KS-FX12]
J ...... Northern America J ...... Northern America J Northern America
E... Continental Europe
Contents

Safety precaution ----------- Block diagram ----------------------------------------- 2-1 8
Instructions ------------- 1-3 - 12 Standard schematic diagrams - 2-19
Disassembly method ~ 2-1 Printed circuit boards M 2-22 - 24

Adjustment method --------------- 2.3 Parts "51 ___________________
Description of major ICs ............................. 2.12

No.49522

COPYRIGHT c 1999 VICTOR COMPANY OF JAPAN, LTD.
Nov. 1999

Page 2

KS-F1 50
KS-FX1 2

1-2

Safety Precaution

A CAUTION Burrs formed during molding may be left over on some parts of the chassis. There-tore,
pay attention to such burrs in the case of preforming repair of this system.

lFeature Check List

Model KS-F150 KS~FX12/FX12WT KS»FX12
Features J J E

Changer Control _ O O

Line Flear Output 0 __ O

Page 23

KS-F150

KS-FX1 2
IMechanism Adjustment Section
Item Adjusting & Confirmation Methods Adjust Std. Value
1.Head azimuth "Head Height Adjustment"
Nfigjust the azimuth directly. When you adjust the height us-
ing a mirror tape, remove the cassette housing from the A Line

mechanism chassis.
After installing the cassette housing, perform the azimuth /
adlustment Head shield

1.|oad the mirror tape ( SOC-1659 ). Adjust with height The head/s at/owposition
adjustmentscrew (a) and azimuth adjustment screw (b) so during FWD.
that line A" of the mirror tape runs in the center between
Lch and Rch in the reverse play mode.

2.After switching from REV to FWD then to REV, check that

the head position set in procedure "1" is not changed. B Line
*If the position has shifted, adjust again and check. .
3.Adjust the azimuth screw (b) so that line "B" of the mirror H d h Id
tape runs in the center between Lch and Rch in the fonivard ea 5 '6
play m0de~ The head is at height position
during REV.

"Head Azimuth Adjustment"
1.Load the test tape ( VT724: 1kHz ) and play it back in the Head 8 . th
reverse play mode. set the Rch output level to maximum. 2 Fixed screw
2.Load the test tape ( VT703: 10kHz ) and play it back in the screw

forward play mode. Adjust the Ftch and Lch output levels

tomaximum, with azimuth adjustment screw (b).

In this case, the phase difference should be within 45° .
3.Engage the reverse mode and adjust the output level to
maximum, with azimuth adjustment screw ((2).
'The phase difference should be 45_Kor more
4.When switching between fonivard and reverse modes, the screw (c) screw (8)
difference between channels should be within 3dB. screw (b)
Between FWD Lch and Rch, REV Lch and Rch.
5.When the test tape ( VT721 : 315Hz ) is played back, the 45°

09
level difference between channels should be within 1.5dB.

2.Tape Speed and 1.Check to see if the reading of the frequency counter & Wow Built~in Tape Speed
Wow & Flutter flutter meter is within 2940-3090 Hz( FWD/REV ), and less volume resistor 2940-3090Hz
than 0.35% ( JIS RMS ). Wow&Flutter
2.ln case of out of specification, adjust the motor with a built- Less than
in volume resistor. 0.35%

(JIS FtMS)
3.Playback 1.P|ay the test tape ( VT724 : 1kHz) back and set the volume Speaker out
Frequency Position at 2V- 1kHz/8kHz
response 2. Play the test tape ( VT739 )back and confirm O t 3dB at1kHfl : OdB_l3dB,

BkHz and -4+2dB at 1kHz/125Hz. 125HZ/1KHZ
3.When 8kHz is out of specification, it will be necessary to .-4dB+2dB,
read adjust the azimuth.