JVC AV21LXB
Service Manual

AV-21LXB AV-25LXB

SPECIFIC SERVICE INSTRUCTIONS
DISASSEMBLY PROCEDURE
REMOVING THE TWIN PORT BASS BLASTER UNIT
1. Unplug the AC power cord. 2. Disconnect the Twin Port Bass Blaster Unit's cord from the rear of the TV set. 3. Remove the Twin Port Bass Blaster Unit by pulling it upward.

REMOVING THE REAR COVER

� After removing the twin port bass blaster unit.
1. Remove the 7 or 9 screws marked � and 4 screws maked shown in Fig.1. 2. Withdraw the Rear cover toward you.

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[CAUTION] When reinstalling the rear cover, carefully push it inward after inserting the Main PWB into the rear cover groove.

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REMOVING THE MAIN PW BOARD

� After removing the rear cover.
1. Slightly raise the both sides of the Main PWB by hand, take off the PB Stopper marked � from the front cabinet. 2. Withdraw the Main PWB backward. (If necessary, take off the wire clamp and connectors, etc.)

REMOVING THE SPEAKER

� After removing the rear cover.
1. Remove the 2 screws marked � and 2 screws maked ´ as shown in Fig.1. 2. Follow the same steps when removing the other hand speaker.

CHECKING THE MAIN PW BOARD
1. To check the back side of the Main PWB. 1) Pull out the Main PWB. (Refer to REMOVING THE MAIN PW BOARD). 2) Erect the Main PWB vertically so that you can easily check its back side. [CAUTION] Before turning on power, make sure that the CRT earth wire and other connectors are properly connected. When repairing, connect the Deg. coil to the DEG. connector on the Main PWB.

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WIRE CLAMPING AND CABLE TYING
1. Be sure to clamp the wire. 2. Never remove the cable tie used for tying the wires together. Should it be inadvertently removed, be sure to tie the wires with a new cable tie.

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No. 51850