JVC RC-BX30 Service Manual Download Page 14 | Manualshive

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RC-BX30

1-14

Adjustment method

Measuring instructions required for
adjustment

1. AM signal generator
2. FM signal generator
3. Inter mediate frequency sweep generator
4. FM stereo signal generator
5. Low-frequency oscillator
(oscillation frequency 50Hz-20kHz, 0dB output
with 600 ohm impedance)
6. Attenuator (600 ohm impedance)
7. Electronic voltmeter
8. Distortion meter
9. Torque gauge (cassette for CTG-N)
10. Wow & flutter meter
11. Frequency counter meter
12. Test tape
VT712 : For tape speed and wow flutter
VT724 : For reference level
VT702 : For playback frequency
VT702 : For head azimuth adjustment

13. Blank tape
TAPE : AC-225

Measurement conditions

Power supply voltage
AC110V-127V/210V-230V (60Hz/50Hz)

Measuring instruments

Radio section
FM 1kHz, 22.5kHz deviation
FM STEREO : 1kHz, 67.5kHz deviation
pilot signal 7.5kHz
AM : 1kHz, 30% modulation
Reference output :
Speaker output 0dBs (0.447V)/4 ohm
H.phone output -10dBs (0.245V)/32 ohm
Standard position of function switch :
Selects FM in tuner mode
Bass boost: OFF
Main volume: Reference output

Amplifier section
Reference output :
Speaker output 0dBs (0.447V)/4 ohm
H.phone output -10dBs (0.245V)/32 ohm
Standard position of function switch :
Selects TAPE mode

CD section
CD test disc : CTS-1000

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Summary of Contents for RC-BX30

Page 1: ...icity Important for laser products Disassembly method Adjustment method Trouble shooting 1 2 1 3 1 4 1 5 1 14 1 17 RC BX30 Area suffix UJ U S Military Flow of functional operation until TOC read Maintenance of laser pickup Replacement of laser pickup Description of major ICs Wiring connection 1 18 1 19 1 19 1 20 1 22 CD PORTABLE SYSTEM ...

Page 2: ...uct antenna terminals knobs metal cabinet screw heads headphone jack control shafts etc to be sure the product is safe to operate without danger of electrical shock Do not use a line isolation transformer during this check Plug the AC line cord directly into the AC outlet Using a Leakage Current Tester measure the leakage current from each exposed metal parts of the cabinet particularly any expose...

Page 3: ...y Ground the workbench by laying conductive material such as a conductive sheet or an iron plate over it before placing the traverse unit optical pickup on it 2 1 Ground the workbench 2 2 Ground yourself Use an anti static wrist strap to release any static electricity built up in your body In order to maintain quality during transport and before installation both sides of the laser diode on the re...

Page 4: ...y switches malfunction the laser is able to function 6 CAUTION Use of controls adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure VARNING Osynlig laserstrålning när denna del är öppnad och spårren är urkopplad Betrakta ej strålen VARO Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle Älä katso sät...

Page 5: ...on of the arrow 1 See Fig 3 While removing the front cabinet assembly from the cassette knobs and remove it in the upward direction 2 See Fig 3 Disconnect the speaker wire from the connector CN401 on the main board See Fig 4 Open the CD door Lift the handle slightly While pressing the claws a of the rear cabinet assembly in the direction of the arrow 1 slide the handle in the direction of the arro...

Page 6: ...ear assembly Note When attaching the screws C apply a locking agent to the screws C Note When attaching the screws B apply a locking agent to the screws B Removing the cassette door See Fig 7 1 2 While pressing the section c of the cassette door in the direction of the arrow remove the boss d of the cassette door from the section e of the front cabinet assembly Disengage the boss f of the cassette...

Page 7: ... assembly Note When attaching the screws G apply a locking agent to the screws G Removing the main board See Figs 9 and 11 1 2 3 4 5 Disconnect the wire from the connector CN101 on the tuner board See Fig 9 Pull out the volume DBB and function knobs from the main board See Fig 11 Disconnect the wires from the connectors CN302 CN303 and CN501 on the main board See Fig 11 Remove the solders from the...

Page 8: ...m side of the CD mechanism assembly remove the tie bands bundling the wires from the CD mechanism assembly See Fig 14 Disconnect the wires from the connectors BC01 BC02 and BC03 on the CD servo board See Fig 14 Remove the solders from the soldered section j connecting the wires to the micro switch board See Fig 14 Remove the two screws L retaining the display board See Fig 15 Press the claws k in ...

Page 9: ...te deck mechanism assembly See Fig 17 1 2 3 Remove the solders from the soldered section p connecting the wires of the leaf switch Remove the solders from the soldered section q connecting the wires of the REC PB head Remove the two screws N retaining the cassette deck mechanism assembly Prior to performing the following procedures remove the display board Note When attaching the screws N apply a ...

Page 10: ... and black See Fig 19 Remove the two screws R retaining the power transformer See Fig 20 Remove the two screws S retaining the socket cover See Fig 20 Take out the power transformer together the socket cover and voltage selector switch Prior to performing the following procedures remove the main board and cassette deck CD mechanism assembly Note When attaching the screws P and R apply a locking ag...

Page 11: ...ldered section t connecting the wires Remove the screw U retaining the micro switch board Removing the CD gear assembly See Fig 23 1 2 From the bottom side of the cassette deck CD mechanism assembly remove the two screws V retaining the CD gear assembly Take out the CD gear assembly Removing the CD door See Fig 23 1 2 3 Open the CD door While pressing the arm section u of the CD door in the direct...

Page 12: ...o performing the following procedures remove the CD mechanism assembly Caution Be sure to apply the solder in order to the short land section a on the CD pickup unit before removing the flexible wire from the CD pickup unit See Fig 2 If the flexible wire is disconnected without apply this solder the CD pickup may be damaged 5 From the bottom side of the CD mechanism assembly remove the solders of ...

Page 13: ... the cassette deck mechanism assembly remove the main belt From the top side of the cassette mechanism assembly remove the slit washer retaining the shaft of the flywheel assembly Pull out the flywheel assembly in the direction of the arrow See Fig 5 Removing the flywheel assembly See Figs 4 and 5 Cassette deck mechanism assembly section Removing the leaf switch See Fig 3 Pressing the claw a of th...

Page 14: ...r reference level VT702 For playback frequency VT702 For head azimuth adjustment 13 Blank tape TAPE AC 225 Measurement conditions Power supply voltage AC110V 127V 210V 230V 60Hz 50Hz Measuring instruments Radio section FM 1kHz 22 5kHz deviation FM STEREO 1kHz 67 5kHz deviation pilot signal 7 5kHz AM 1kHz 30 modulation Reference output Speaker output 0dBs 0 447V 4 ohm H phone output 10dBs 0 245V 32...

Page 15: ...2 Signal output terminal PHONES with 32 ohm load Tape Normal Signal output terminal Cassette REC PLAY HEAD Test tape AC225 Signal input FM22 5 DEV 60dBu with emphasis Signal output terminal PHONES with 32 ohm load Head azimuth adjustment Tape speed and wow flutter check and adjustment PB frequency response check Bias frequency check REC and PB frequency response adjustment 1 2 3 1 2 3 Output level...

Page 16: ...generator at maximum Adjust the PVC11 C1 for maximum output Repeat the adjustment of the above steps 3 and 4 Set the dial at low end set the S G at 515kHz 5kHz 5kz Adjust the L105 check to see the output is maximum Set the dial at high end set the S G at 1620kHz 15kHz 15kHz Adjust the PVC11 C4 check to see the output is maximum Set the dial while receiving a 600kHz signal from an AM signal generat...

Page 17: ...d Low sensitivity No sound weak sound Low sensitivity No sound recording unsteady tape sound weak sound Cannot read the table of content No display no sound General MW SW FM Tape CD Remedy Check the speaker connection Set switch to the proper position Set the volume control to a proper sound level Replace the earphone jack Rotate or reposition the unit Check resistance voltage and current Replace ...

Page 18: ...BX30 1 18 Flow of functional operation until TOC read Power ON Slider turns REST SW ON Laser ON Focus start FOK PLL Lock Turn on radial servo Read TOC Turn on focus servo Disc spinning Radial_error scaling ...

Page 19: ...When the life of the laser diode has expired the following symptoms will appear The level of RF output EFM output ampli tude of eye pattern will below Is the level of RF OUT under 1 25V 0 22Vp p Replace it NO YES O K 3 Semi fixed resistor on the APC PC board The semi fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser power Since this adjustm...

Page 20: ...ght channel negative feed back input Right channel signal input Left channel signal input Left channel negative feed back input Not connect Left channel output Left channel ALC input Ripple filter Power supply Pin No Symbol Function I O I I I I O I I O 14 13 12 11 10 9 1 2 3 4 5 6 Ripple Filter Amp Ch2 8 ALC 7 GND Vcc Amp Ch1 FM RF FM MIX FM OSC 1 DECODER PHASE COMP DET CND2 AM MIX AM OSC AM RF RE...

Page 21: ...30kW 30kW CH 2 RIP Bias Circuit Thermal Shut Down Protection Circuit pre GND SDBY VC RBS ROUT S GND LOUT LBS SDBY ROUT RBS SGND RNF RIN VC LOUT LBS RIP LNF LIN 1 2 3 4 5 6 13 12 11 10 9 8 7 14 MC14094 IC601 XXXXX 1 Terminal layout STR 0 CP OP0 OP1 OP2 OP3 GND VCC CE OP4 OP5 OP6 OP7 OS2 OS1 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 ...

Page 22: ...K SPEAKER L SPEAKER R Power transformer AC INPUT POWER SELECT SWITCH Voltage selector switch AC SOCKET 110 127V 220 230V BATT DECK HEAD REC PB head Display board Forward side OW20 41032 06K RC BX30 UJ VERSION Cassette board Forward side 1 4 1 4 6 1 4 1 10 6 1 4 1 10 1 4 R CH L CH CN303 CN501 1 4 BATT 1 1 6 1 4 1 3 1 3 6 10 1 1 10 1 5 1 5 1 5 1 3 1 6 4 9 4 6 2 0 1 6 0 2 3 4 0 Micro switch board For...

Page 23: ...RC BX30 1 23 M E M O ...

Page 24: ...RC BX30 VICTOR COMPANY OF JAPAN LIMITED AUDIO COMMUNICATION BUSINESS DIVISION PERSONAL MOBILE NETWORK BUSINESS UNIT 10 1 1Chome Ohwatari machi maebashi city 371 8543 Japan 200212 No 21171 ...

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