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JVC KS-FX270, Service Manual

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JVC KS-FX270 Service Manual Download Page 24

KS-FX270

1-24

KIA7810PI (IC902) : Regulator

1.Pin layout

2.Block diagram

1 2 3

1  INPUT

3  OUTPUT

2  GND

R4

R18

R8

Q8

R9

Q9

Q14

Q15

R13

R21

Q16

R12

R17

Q17

R11

Z1

R5

R6

R7

Q12

Q13

Q10

R1

Q1

Q7

R10

R3

Q5

Q6

R15

R2

Q2

R14

Q3

Q4

C1

R16

Q11

R20

R19

1

2

3

4

5

6

7

8

9

10

GND OUT1 P1

VZ

IN1

IN2

VCC1 VCC2 P2

OUT2

Input

Output

Mode

IN1

IN2

OUT1

OUT2

Brake

0

0

0

0

1

0

1

0

0

1

0

1

1

1

0

0

CLOCKWISE

COUNTER-CLOCKWISE

Brake

LB1641 (IC402) : DC motor driver

1. Pin layout

2. Pin function

Summary of Contents for KS-FX270

Page 1: ...AN LTD KS FX270 KS FX270 Area Suffix J Northern America Contents Safety precaution Disassembly method Adjustment method Description of major ICs 1 2 1 3 1 12 1 16 This service manual is printed on 100 recycled paper Scan Music Multi MO DISP DISP SCAN SCAN LOUD LOUD 8 9 10 1 1 12 7 VCR 32 ...

Page 2: ...KS FX270 1 2 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 Safety precaution ...

Page 3: ... following procedure remove the front panel assembly Release the four joint tabs a on both sides of the front chassis assembly and remove the front chassis assembly toward the front 1 Removing the front chassis assembly See Fig 2 and 3 Disassembly method Main body Fig 1 Fig 2 Fig 3 Front panel assembly Eject button Tab a Tab a Front chassis assembly Front chassis assembly Heat sink Tab a Tab a ...

Page 4: ...ve the front panel assembly the front chassis assembly and the heat sink Turn over the body and unjoint the five joints b with the bottom cover and the body using a screwdriver 1 Removing the bottom cover See Fig 5 and 6 Fig 4 Fig 5 Fig 6 Heat sink A A Joints b Joints b Joint b Joints b Joints b Joint b Bottom cover Bottom cover Rear panel Rear panel ...

Page 5: ...om of the body Disconnect connector CN701 on the main board in the direction of the arrow 1 2 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 the bottom cover and the main board Remove the four screws F attaching the cassette mechanism section on the back of the top chassis 1 Removing the c...

Page 6: ... on the back of the front panel assembly Unjoint the six joints c with the front panel and the rear cover Remove the control switch board on the back of the front panel 1 2 3 Removing the control switch board See Fig 10 to 12 Fig 10 Fig 11 Fig 12 G G G G Rear cover Joints c Joints c Front panel Rear cover Front panel Control switch board ...

Page 7: ...ction of the arrow 1 2 3 4 Removal of the cassette mechanism Removing the head amplifier P W B See Fig 1 and 2 Disconnect the 6pin harness from connector CN402 and the card wire from CN403 on the head amplifier P W B Refer to Fig 1 and 2 Remove the four screws B on the bottom of the cassette mechanism 1 2 Removing the cassette mechanism assembly See Fig 1 to 3 Fig 1 Cassette mechanism ass y Head r...

Page 8: ...h the one side of the sub chassis Then release the sub chassis from the tab f 1 2 Removing the sub chassis See Fig 6 Prior to performing the following procedure remove the head relay P W B the load arm and the sub chassis Remove the screw E attaching the reinforce bracket Remove the reinforce bracket Push the tab g fixing the cassette holder in the direction of the arrow and open the cassette hold...

Page 9: ...ction of the arrow 1 2 Removing the reel disc P W B See Fig 10 Unsolder the two soldering l of the motor and the sub motor Release the sub motor from the three tabs m Push the sub motor upward and pull out it Remove the belt on the bottom of the cassette mechanism assembly and remove the two screws G attaching the motor 1 2 3 Removing the motor and the sub motor See Fig 10 and 11 The motors can be...

Page 10: ... relay P W B the load arm the sub chassis the cassette holder and the holder arm Disengage the part n inside of the reel driver which engages with the shaft using a pincette or something like that Then remove the reel driver from the shaft Remove the reel driver spring and the reel table 1 2 Removing the reel disc ass y See Fig 12 to 14 When reassembling make sure to use a new slit washer ATTENTIO...

Page 11: ...that Remove the reel disc ass y as with the reel disc ass y 1 2 3 Removing the reel disc ass y See Fig 12 to 15 Do not break the front panel tab fitted to the metal cover ATTENTION Prior to performing the following procedure remove the reel disc ATTENTION Fig 15 Push aside the gear and reattach the reel disc Ass y Reel disc ass y ...

Page 12: ...conditions Amplifier section Power supply voltage DC14 4V 10 5 16V Load impedance 4 2Speakers connection Line out 20k Standard volume position Balance and Bass Treble volume Fader Center Indication 0 Loudness Dolby NR Sound Cruise Off Volume position is about 2V at speaker output with following conditions Playback the test tape VT721 AM mode 1000kHz 62dB INT 400Hz 30 modulation signal on recieving...

Page 13: ...n view Cassette mechanism Surface Arrangement of adjusting test points Motor assembly Tape speed adjust Playback head Azimuth screw B Reverse Azimuth screw B Reverse Azimuth screw A Forward Azimuth screw A Forward Playback Head ...

Page 14: ...d EXTKSRT002 18P 18 pin extension cord For connection between mechanism assembly and main board assembly Check for mechanism driving section such as motor etc Disassembly method 1 Remove the bottom cover 2 Remove the front panel assembly 3 Remove the top cover 4 Install the front panel 5 Confirm that current is being carried by connecting an extension cord jig Note Available to connect to the CP70...

Page 15: ...eak of Lch Rch output with Azimuth screw A For Oscilloscope litharge corrugation set 45 as standard b At Reverse play mode make adjustment of peak of Lch Rch output with Azimuth screw B For Oscilloscope litharge corrugation set 45 as standard c With AC volt meter confirm the difference of output for 4ch between Lch Rch at forward play mode and Lch Rch Reverse play mode being within 3 0dB d After o...

Page 16: ...L IAL Serial data input output Ground output left rear output left front Treble control capacitor left channel or input from an external equalizer Bass control capacitor left channel or output to an external equalizer Bass control capacitor left channel Input volume 1 left control part Input loudness left control part Output source selector left channel Not used Not used Input C left source Not us...

Page 17: ... 5 6 7 8 9 10 11 12 ILL MODE2 MODE1 STB VDD AMP VCC ANT COM AM FM GND 10V power supply for illumination When 5V is input becomes AM and the antenna output is turned on When 5V is input becomes AM and the output of FM is switched When 5V is input outputs to ILL COM and AMP It is 0V usually 5 6V power supply Power supply supply to remote amplifier Back up connects with ACC with it Power supply suppl...

Page 18: ...BOUT2 OUTREF2 TAPEIN2 GND DIREF LINEOUT2 NC NC MSSW PBTC1 PBOUT1 OUTREF1 TAPEIN1 NC NC LINEOUT1 NC NC MSLPF 31 32 33 34 35 36 37 38 39 40 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 30 29 28 27 26 25 24 23 22 21 7k 12k 7k 12k 300k 70 120 70 120 100k 100k 24dB MS MODE BIAS MUTE TAPE EQ FWD RVS LPF DET 24dB T2 X1 X1 F2 30k 30k 45k F1 300k T1 F3 Vcc MS ON OFF CXA2559Q IC401 Head amp ...

Page 19: ... Head change control terminal Detection mode control terminal between tunes Detection function control terminal between tunes Non connection Non connection Line out output terminal Resistance connection terminal for standard current setting Earth terminal Tape input terminal Output standard terminal Reproduction equalizer output terminal Terminal of capacity of reproduction equalizer Reproduction ...

Page 20: ...electrical volume Clock output for electrical volume information Non connection Non connection Non connection Non connection Non connection Non connection Non connection Non connection Non connection Non connection Non connection Non connection Diode matrix output port for initial establishing Diode matrix output port for initial establishing Diode matrix output port for initial establishing Non c...

Page 21: ...h for detecting tape end position Detecting mode position input Switch for detecting forward reverse H FWD L REV MS input port Station detector Stereo signal input H SD Front panel detect Connect to encoder 1 Connect to encoder 2 Cut in signal detecting port from J Bus information Non connection FM AM mode switching signal port H FM L AM Non connection Non connection Mute output port L Mute Back u...

Page 22: ...p 1 Pin layout 2 Block diagram IN1 IN2 IN3 IN4 STBY 2 1 11 13 23 10 TAB PROTECTOR ASO SURGE TSD INPUTBUFFER1 INPUTBUFFER2 INPUTBUFFER3 INPUTBUFFER4 AMP1 AMP2 AMP3 AMP4 MUTE PVCC1 PVCC2 INVCC 12 22 14 18 6 3 4 5 7 8 9 15 16 17 19 20 21 1 23 ...

Page 23: ...nput Common driver output pins The frame frequency is given by t0 fosc 384 Hz Power supply connection Provide a voltage of between 4 5 and 6 0V Display turning off input pin INT L Vss off S1 to S52 COM1 to COM3 L INT H VDD on Serial data can be transferred in display off mode Used for applying the LCD drive 2 3 bias voltage externally Must be connected to VDD2 when a 1 2 bias drive scheme is used ...

Page 24: ...1 Q16 R12 R17 Q17 R11 Z1 R5 R6 R7 Q12 Q13 Q10 R1 Q1 Q7 R10 R3 Q5 Q6 R15 R2 Q2 R14 Q3 Q4 C1 R16 Q11 R20 R19 1 2 3 4 5 6 7 8 9 10 GND OUT1 P1 VZ IN1 IN2 VCC1 VCC2 P2 OUT2 Input Output Mode IN1 IN2 OUT1 OUT2 Brake 0 0 0 0 1 0 1 0 0 1 0 1 1 1 0 0 CLOCKWISE COUNTER CLOCKWISE Brake LB1641 IC402 DC motor driver 1 Pin layout 2 Pin function ...

Page 25: ...ensor Vcc Vcc Comp AGC AMP PD Detector BPF fo trimming circuit I V conversion magnetic shield Rout GND 22k 1 Block diagram 1 2 3 4 5 6 7 14 13 12 11 10 9 8 OE1 A1 Y1 OE2 A2 Y2 Vss Vcc OE4 A4 Y4 OE3 A3 Y3 HD74HC126 HD74HC126P IC801 Bus buffer ...

Page 26: ...Printed in Japan 200012 V VICTOR COMPANY OF JAPAN LIMITED MOBILE ELECTRONICS DIVISION PERSONAL MOBILE NETWORK BUSINESS UNIT 10 1 1Chome Ohwatari machi Maebashi city Japan No 49582 KS FX270 ...

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