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JVC TH-M501 Service Manual Download Page 11

(No.MB192)1-11

3.1.8 Removing the main board 

(See Fig.11)

• Prior to performing the following procedures, remove the metal

cover, rear panel, audio & digital input board and tuner.

(1) From the top side of the main body, disconnect the card

wires from the connectors (

CN401

 to 

CN403

, 

CN450

 and

CN460

) on the main board.

Reference:

When reassembling, connect the card wires to the con-
nectors (

CN401

 to 

CN403

) on the main board after pass-

ing the card wires through the hole f on the main board.

(2) Disconnect the parallel wires from the connectors (

CN404

to 

CN407

, 

CN456

 and 

CN457

) on the main board.

(3) From the top side of the main body, remove the two screws

P

 and screw 

P'

 attaching the main board on the bottom

chassis.

Reference:

When attaching the screw 

P'

, attach the earth wire with

it. (See Fig.11)

(4) Take out the main board from the main body.

Fig.11

Main board

P

P'

P

Bottom chassis

Earth wire

CN404

CN407

CN406

CN405

CN402

CN401

Hole 

f

CN457

CN460

CN456

CN403

CN450

Summary of Contents for TH-M501

Page 1: ...5 TH M505 TH M501 TABLE OF CONTENTS 1 PRECAUTION 1 3 2 SPECIFIC SERVICE INSTRUCTIONS 1 6 3 DISASSEMBLY 1 7 4 ADJUSTMENT 1 32 5 TROUBLESHOOTING 1 34 Area suffix J U S A Area suffix J U S A C Canada TH M501 TH M505 SP THM505C SP THM303C SP THM505F SP THM303F SP THM505S SP THM303S SP PWM505 SP PWM501 XV THM505 XV THM501 ...

Page 2: ...nches 3 3 8 inches 15 inches Amplifier section Front Center Surround 140 W 80 W 2 per channel RMS at 4 Ω Center Surround 140 W 120 W 2 per channel RMS at 4 Ω Front at 1 kHz with 10 total harmonic distortion Subwoofer 300 W RMS at 4 Ω at 100 Hz with 10 total harmonic distortion Speaker section Speaker unit 25 cm 9 7 8 inches Bass reflex Magnetically Shielded Frequency Range 20 Hz to 200 Hz General ...

Page 3: ...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 particular ly any exposed metal part having a return path to the chassis to a known goo...

Page 4: ...ition of the laser diode in the optical pickup The tester s internal power source can easily destroy the laser diode 1 6 Handling the traverse unit optical pickup 1 Do not subject the traverse unit optical pickup to strong shocks as it is a sensitive complex unit 2 Cut off the shorted part of the flexible cable using nippers etc after replacing the optical pickup For specific details refer to the ...

Page 5: ...st risk of fire replace only with same type 1 6A 125V for F901 This symbol specifies type of fast operating fuse Precaution Pour eviter risques de feux remplacez le fusible de surete de F901 comme le meme type que 1 6A 125V Ce sont des fusibles suretes qui functionnes rapide Power board 1 6A 125V F901 ...

Page 6: ...1 6 No MB192 SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS ...

Page 7: ...crews B attaching the metal cover See Fig 3 3 Lift the rear section of the metal cover in the direction of the arrow while extending the lower sections of the metal cov er release the five claws a using a longer screwdriver from the inside as required See Fig 4 Note Do not damage any parts and boards inside the main body when releasing the claws a using a longer screwdriver Fig 1 Fig 2 Fig 3 Fig 4...

Page 8: ...screw C attaching the earth wire to the main board See Fig 5 Reference When attaching the screw C attach the earth wire with it See Fig 5 4 From the bottom side of the main body remove the three screws D attaching the front panel assembly See Fig 6 5 From the both and bottom sides of the main body remove the front panel assembly in the direction of the arrow while releasing the joints b and c See ...

Page 9: ...e four screws E attaching the DVD changer mechanism assembly on the bottom chassis 3 Take out the DVD changer mechanism assembly in the up ward direction Reference When attaching the DVD changer mechanism assembly align the holes of the DVD changer mechanism assembly to the pro jections e on the bottom chassis Fig 7 3 1 4 Removing the rear panel See Fig 8 Prior to performing the following procedur...

Page 10: ...connector CN1 on the tuner See Fig 9 2 From the back side of the main body remove the two screws L attaching the tuner to the rear panel See Fig 10 3 Take out the tuner from the main body 3 1 7 Removing the power supply board See Figs 9 and 10 Prior to performing the following procedures remove the metal cover 1 From the top side of the main body disconnect the parallel wires from the connectors C...

Page 11: ...ors CN401 to CN403 on the main board after pass ing the card wires through the hole f on the main board 2 Disconnect the parallel wires from the connectors CN404 to CN407 CN456 and CN457 on the main board 3 From the top side of the main body remove the two screws P and screw P attaching the main board on the bottom chassis Reference When attaching the screw P attach the earth wire with it See Fig ...

Page 12: ...Fig 1 1 From the inside of the front panel assembly remove the three screws C attaching the operation board Reference When attaching the operation board align the projec tions c of the front panel assembly to the holes of the op eration board 2 Take out the operation board with the button top Fig 1 3 2 4 Removing the front board See Figs 2 and 3 Prior to performing the following procedures remove ...

Page 13: ... Removing the illumination board See Figs 5 and 6 1 Open the DVD door of the front panel assembly and re move the three screws F attaching the door holder to the DVD door See Fig 5 2 Remove the DVD door from the door holder See Fig 5 3 From the inside of the DVD door disconnect the card wire from the connector CN551 on the illumination board See Fig 6 4 Take out the illumination board from the DVD...

Page 14: ...sm as sembly draw out the tray assemblies toward the front while pushing the part b of the side R assembly See Fig 4 Attention The tray can be locked if all tray assemblies are at tached 5 From the top side of the DVD changer mechanism assem bly move the stopper tabs c in the direction of the arrow and release them Pull out the tray assemblies from the DVD changer mechanism assembly See Figs 4 and...

Page 15: ... the DVD servo board disconnect the card wire from the connector CN101 in the direction of the arrow 1 on the DVD servo board See Fig 8 5 Take out the DVD servo board Caution Unsolder the solders from the short circuit points d after reas sembling Reference When connecting the card wire to the connector CN201 let the wire through the slots e 3 3 3 Removing the switch board See Fig 7 1 From the bot...

Page 16: ...ing the motor See Fig 10 Prior to performing the following procedures remove the motor board 1 From the reverse side of the motor board unsolder the four soldered sections h on the motor board 2 From the forward side of the motor board remove the mo tors Fig 9 Fig 10 3 3 6 Removing the DVD traverse mechanism assembly See Fig 11 Prior to performing the following procedures remove the tray assemblie...

Page 17: ... shaft See Fig 13 8 Remove the two screws J attaching the rack arm to the DVD pickup See Fig 14 9 Pull the screw shaft from the DVD pickup in the direction of the arrow See Fig 14 3 3 8 Attaching the DVD pickup See Figs 12 to 14 1 Attach the screw shaft to the DVD pickup and attach the rack arm with the screws J See Fig 14 Reference After attaching the screw shaft to the DVD pickup attach the scre...

Page 18: ...hrough the hole n on the motor base See Fig 15 Fig 15 Fig 16 3 3 10 Removing the feed motor See Figs 17 and 18 Prior to performing the following procedures remove the tray assemblies DVD traverse mechanism assembly DVD pickup and spindle motor board Remove the wires of the feed motor as required 1 Remove the middle gear in the direction of the arrow See Fig 17 2 Remove the screw N and screw P atta...

Page 19: ...ach the side L assembly in an upward direction See Fig 20 4 Remove the screw S attaching the tray switch board to the side L assembly See Fig 21 5 Release the joint tab r of the side L assembly in the direc tion of the arrow 1 and release the joint tab s while remov ing the tray switch board in the direction of the arrow 2 See Fig 21 Reference After attaching the tray switch board to the motor boa...

Page 20: ... elevator spring attached to the hook u of the chassis assembly See Figs 23 and 24 3 From the topside of the DVD changer mechanism assem bly turn the gear 1 clockwise to move the elevator cam rearward See Fig 24 4 Move the two slots v and joint w of the elevator cam and remove the elevator cam outward See Fig 24 5 Remove the three screws T and detach the side R as sembly upward See Figs 25 and 26 ...

Page 21: ...ck it in the di rection of the arrow 1 and release four joints z to detach from the rack holder See Fig 29 4 Release the rod from part aa See Fig 29 5 Turn the gear 1 clockwise again to move the lifter assembly upward See Fig 30 6 Remove the lifter assembly from the DVD changer mecha nism assembly upward at the positions ab where the four pins on the both sides of the lifter assembly fit to the no...

Page 22: ...n the sensor slider See Figs 35 and 36 5 Remove the screw W and X attaching the sensor board and SV resister respectively See Fig 37 Reference Remove the solder from the solder point ai on the sensor board as required See Fig 37 Caution When reattaching the SV resister attach the sensor slider to the sensor bracket and fit the lever on the bottom of the SV resister into slot aj of the sensor slide...

Page 23: ... Sensor assembly Boss af Sensor slider Sensor slider Slot aj Hole ah Boss af Sensor spring W X Slot aj Solder point ai Sensor board SV resister Sensor bracket Sensor slider Pin ak Hole ah Boss af Joint ae V Sensor assembly Slide gear Sensor spring Slide lever V Notch ag Notch am ...

Page 24: ...urn the gear 2 clockwise to move the sub tray remaining inside the lifter assembly toward the front then pull out See Fig 39 5 Take out the disc on the sub tray See Fig 40 6 After clearing away the disc insert the sub tray into the main tray See Fig 41 Caution When reattaching the sub tray move the tray stopper on the bottom of the main tray in the direction of the arrow to lock the sub tray certa...

Page 25: ...g the following procedure remove the ampli fier assembly 1 From the back side of the amplifier assembly remove the four screws C screw D and two screws E attaching the rear panel See Fig 4 2 From the top side of the amplifier assembly take out the rear panel with fan motor and disconnect the wire from the connector CN202 on the amplifier board See Fig 3 3 4 3 Removing the fan motor See Fig 4 Prior...

Page 26: ... the heat sink bracket attach the screw H with barrier Fig 5 3 4 5 Removing the amplifier board See Fig 6 Prior to performing the following procedures remove the am plifier assembly and heat sink bracket 1 From the top side of the amplifier assembly disconnect the amplifier board from the connector CN201 and CN203 on the main board 2 Take out the amplifier board and disconnect the wire from the co...

Page 27: ...on the power board See Fig 8 3 Disconnect the power cord from the connector CN311 on the power board and take out the power cord See Fig 8 4 Disconnect the wire from the connector CN501 on the LED board See Fig 9 5 Disconnect the power board from the connector CN301 CN302 and CN303 on the main board and take out the power board assembly from the amplifier assembly See Fig 8 Reference Remove the sc...

Page 28: ...emove the screw P attach the barrier as required Fig 10 Fig 11 3 4 8 Removing the main board See Fig 12 Prior to performing the following procedures remove the am plifier assembly rear panel heat sink bracket amplifier board power board and heat sink 1 From the top side of the amplifier assembly remove the wires from the wire clamps on the main board 2 Remove the three screws Q and two screws R at...

Page 29: ...ng the following procedures remove the am plifier assembly heat sink bracket and amplifier board 1 From the top side of the amplifier assembly disconnect the wire from the connectors CN312 and CN321 on the power board 2 Remove the four screws T attaching the power transform er and take out the power transformer from the amplifier assembly Reference When attaching the power transformer attach the s...

Page 30: ... or similar tool into the space between the speaker main body and speaker net and lift the speaker net little by little to remove See Fig 16 Note To prevent damaging the speaker net and speaker main body insert cushioning plates etc and below the tip of the flat bladed screwdriver or similar tool 3 Take out the speaker net from the speaker main body Fig 15 Fig 16 Speaker net U U Speaker net Flat b...

Page 31: ...emove the speaker net 1 From right side of the speaker main body remove the eight screws R attaching the speaker See Fig 17 2 Take out the speaker from the speaker main body See Fig 18 3 Disconnect the wires from the terminal of the speaker See Fig 18 Fig 17 Fig 18 Speaker R Terminal Speaker Speaker main body ...

Page 32: ...ical letter of the system controller and the back end are displayed in the FL display as follows Becomes test mode Checksum of device key Mechanism check mode TEST FL Display becomes all lighting CHECK Area code FE microcomputer learning processing condition Version of microcomputer Refer to 4 2 Metod of displaying version firmware _ Rejion code 0 Normal initialize END 3 Full initialize END after ...

Page 33: ... to off and wait untill See You to off 4 4 Full initialization method Please perform all initialization according to the following procedures in the following case Just after you exchange the pick up Just after you exchange the spindle motor Just after you exchange the traverse mechanism base NOTE Please perform all initialization when you exchange the parts above and also when you remove the part...

Page 34: ...1 34 No MB192 SECTION 5 TROUBLESHOOTING This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS ...

Page 35: ... No MB192 1 35 ...

Page 36: ... No MB192 AV MULTIMEDIA COMPANY AUDIO VIDEO SYSTEMS CATEGORY 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan VICTOR COMPANY OF JAPAN LIMITED WPC Printed in Japan ...

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