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JVC KS-FX270 Service Manual
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JVC KS-FX270 Service Manual

JVC KS-FX270 Service Manual

Cassette receiver
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Download this manual See also: Instruction Manual
SERVICE MANUAL
Contents
Safety precaution
Disassembly method
Adjustment method
Description of major ICs
CASSETTE RECEIVER
KS-FX270
VCR
This service manual is printed on 100% recycled paper.
COPYRIGHT
2000 VICTOR COMPANY OF JAPAN, LTD.
LOUD
LOUD
DISP
DISP
Multi
Music
Scan
SCAN
SCAN
MO
7
8
9
10
1 1
12
J ---- Northern America
1-2
1-3
1-12
1-16
KS-FX270
Area Suffix
No.49582
Dec. 2000

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Summary of Contents for JVC KS-FX270

  • Page 1 KS-FX270 SERVICE MANUAL CASSETTE RECEIVER KS-FX270 LOUD LOUD DISP DISP Multi Music Scan SCAN SCAN Area Suffix J ---- Northern America Contents Safety precaution Disassembly method Adjustment method 1-12 Description of major ICs 1-16 No.49582 This service manual is printed on 100% recycled paper.

  • Page 2: Safety Precaution

    KS-FX270 Safety precaution Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.

  • Page 3: Disassembly Method

    KS-FX270 Disassembly method <Main body> Removing the front panel assembly (See Fig.1) Press the eject button in the lower right part of the front panel. Remove the front panel assembly from the body. Front panel assembly Eject button Fig.1 Tab a Removing the front chassis assembly (See Fig.2 and 3)
  • Page 4 KS-FX270 Removing the heat sink (See Fig.4) Remove the three screws A on the left side of the body. Heat sink Fig.4 Joints b Removing the bottom cover (See Fig.5 and 6) Bottom cover Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly and the heat sink.
  • Page 5 KS-FX270 Removing the main board (See Fig.7 and 8) Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly, the heat sink and the bottom cover. Remove the screw B, the four screws C and the two...
  • Page 6 KS-FX270 Removing the control switch board (See Fig.10 to 12) Prior to performing the following procedure, remove the front panel assembly. Remove the four screws G attaching the rear cover on the back of the front panel assembly. Unjoint the six joints c with the front panel and the Rear cover rear cover.
  • Page 7 KS-FX270 Cassette mechanism ass’y <Removal of the cassette mechanism> Removing the head amplifier P.W.B. Head relay (See Fig.1 and 2) P.W.B. For the 6pin harness extending from connector CN402 on the head amplifier P.W.B, disconnect it from the head relay P.W.B.
  • Page 8 KS-FX270 Head relay P.W.B. Removing the head relay P.W.B. (See Fig.4) Unsolder the soldering b on the head relay P.W.B. Remove the screw C attaching the head relay P.W.B. Remove the head relay P.W.B. in the direction of the Joint c Soldering b arrow while releasing the two joints c.
  • Page 9 KS-FX270 Cassette holder and holder arm Joint h Shaft Joint h Shaft Removing the play head (See Fig.9) Prior to performing the following procedure, remove the head relay P.W.B.and the sub chassis. Fig.8 Remove the two screws F attaching the play head Pinch roller ass’y...
  • Page 10 KS-FX270 Removing the flywheel Cassette mechanism ass’y Reel disc P.W.B. (See Fig.10 and 12) Soldering j Prior to performing the following procedure, remove the head relay P.W.B, the load arm, the sub chassis, the cassette holder, the holder arm and the reel disc Tab k P.W.B.
  • Page 11 KS-FX270 Push aside the gear and reattach the reel disc Ass’y( ). Removing the reel disc ass’y( ) (See Fig.12 to 15) ATTENTION: Prior to performing the following procedure, remove the reel disc ( ). Release the plate from the three tabs o.

  • Page 12: Adjustment Method

    KS-FX270 Adjustment method Test instruments reqired for adjustment Standard volume position 1. Digital osclloscope(100MHz) Balance and Bass,Treble volume .Fader 2. Frequency Counter meter :Center(Indication"0") 3. Electric voltmeter Loudness,Dolby NR,Sound,Cruise:Off 4. Wow & flutter meter Volume position is about 2V at speaker output with 5.
  • Page 13 KS-FX270 Arrangement of adjusting & test points Cassette mechanism (Surface) Motor assembly Tape speed adjust Azimuth screw A (Forward) Playback head Azimuth screw B (Reverse) Head section view Azimuth screw B Azimuth screw A (Reverse) (Forward) Playback Head 1-13...
  • Page 14 KS-FX270 Information f or using a car audio service jig 1. We're advancing efforts to make our extension cords common for all car audio products. Please use this type of extension cord as follows. 2. As a U-shape type top cover is employed, this type of extension cord is needed to check operation of the mechanism assembly after disassembly.
  • Page 15 KS-FX270 Mechanism adjustment section Item Adjusting & Confirmation Methods Adjust Std. Value 1. Tape running a) At Forward playmode, using mirror tape, make adjustment Azimuth adjustment with Azimuth screw A and Azimuth screw B, without curl of 4 screw A parts of head tape guide.

  • Page 16: Description Of Major Ics

    KS-FX270 Description of major ICs TEA6320T-X (IC161) : E.volume 1.Pin layout 2.Block diagram VOLUME 2 MUTE 0 to 55 dB FUNCTION BALANCE OUTRR OUTLR ZERO CROSS FENDER REAR POWER DETECTOR OUTRF OUTLF SUPPLY VOLUME 1 BASS TREBLE +20 to -31 dB...
  • Page 17 KS-FX270 AN80T05LF (IC901) : Regulator 1.Terminal layout & Block diagram Reference Voltage ASO & Peak Current Protection Thermal Protection Drive Drive Drive Drive Drive MODE2 MODE1 5.6V 8.7V 8.7V 8.7V 2.Pin function Symbol Function 10V power supply for illumination. MODE2 When 5V is input,becomes AM.
  • Page 18 KS-FX270 CXA2559Q(IC401):Head amp. 1.Pin layout 2.Blockdiagram 24dB 100k PBFB2 MSMODE 7k/12k PBRIN2 DRSW 300k MS MODE PNGND BIAS TAPESW PNFIN2 MUTESW MUTE TAPE EQ PBREF FWD/RVS MS ON/ PBFIN1 MSOUT PBGND MSTC 300k PBRIN1 G1FB 7k/12k 100k PBFB1 G2FB 24dB...
  • Page 19 KS-FX270 3.Pin function CXA2559Q 2/2 Pin No. Symbol Function PBTC1 Terminal of capacity of reproduction equalizer reproduction PBOUT1 Equalizer output terminal OUTREF1 Output standard terminal TAPEIN1 Tape input terminal Power supply terminal Non connection LINEOUT1 Line-out output terminal Non connection...
  • Page 20 KS-FX270 LC72366-9985 (IC701) : SYSTEM CPU 1. Pin layout 2. Pin function Pin No. Symbol Function Crystal oscillator input port Connect to GND Data input for J-BUS information J-BUS SI Data output for J-BUS information J-BUS SO Clock output for J-BUS information...
  • Page 21 KS-FX270 LC72366-9985(2/2) Pin No. Port Name Function Main motor output, H:Transport L: Stop MOTOR Sub-motor output(+), Loading direction to transport output SUBMO+ Sub-motor output(-), Eject direction to transport output SUBMO- Non connection BEEP Switch for detecting to input cassette, L: Cassette in...
  • Page 22 KS-FX270 HA13158A (IC301) : Power amp 1. Pin layout 2. Block diagram PVCC2 PVCC1 INVCC STBY INPUTBUFFER1 AMP1 INPUTBUFFER2 AMP2 INPUTBUFFER3 AMP3 INPUTBUFFER4 AMP4 MUTE PROTECTOR (ASO SURGE, TSD) 1-22...
  • Page 23 KS-FX270 LC75823W (IC651) : LCD driver 1. Pin Layout & Symbol 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 2.
  • Page 24 KS-FX270 KIA7810PI (IC902) : Regulator 1.Pin layout 2.Block diagram 1 INPUT 1 2 3 3 OUTPUT 2 GND LB1641 (IC402) : DC motor driver 1. Pin layout GND OUT1 P1 IN2 VCC1 VCC2 P2 OUT2 2. Pin function Input Output...
  • Page 25 KS-FX270 RPM6938-SV4(IC652) : Remote Censor 1.Block diagram Comp Rout Detector conversion trimming circuit magnetic shield HD74HC126P (IC801) : Bus buffer HD74HC126 1-25...
  • Page 26 KS-FX270 VICTOR COMPANY OF JAPAN, LIMITED MOBILE ELECTRONICS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,Maebashi-city,Japan Printed in Japan (No.49582) 200012(V)