JVC 340 SC, 330, 370 SC service manual Card Cage Printed Circuit Boards

Chapter 4—Maintenance

4.11 Card Cage (Printed Circuit Boards)

The card cage is located at the rear of the projector above the CRT housing.

CAUTION! Printed circuit boards in the electronics module are susceptible to electrostatic damage. While servicing the projector be sure to observe electrostatic discharge precautions. Always wear a conductive wrist strap and ground lead when handling PCBs.

To remove a PCB:

1.Turn the projector power off at the remote. Wait at least one (1) minute for the high voltage to bleed off.

2.Remove the rear projector cover (see Section 4.2) and toggle the Main Circuit Breaker to off (see Figure 4-7).

3.Remove the eight (8) screws securing the electronics module cover and remove the cover.

4.Slide the card lock latches toward the center of the card lock and remove the card lock.

5.Lift the tabs of the card extractors on the edges of the PCB to unseat a card from its connector(s).

6.Lift the PCB from the electronics module.

7.Replace the PCB in the reverse order.

NOTE: Each PCB has a dedicated card slot with keyed connector positions. Observe the connector positions prior to inserting to ensure proper placement.

CAUTION! Before inserting a PCB into the card cage, ensure there are no bent pins on any connectors. The PCBs may need to be slightly flexed or jostled in order to properly seat them into the backplane. Be sure that all connectors on a PCB are properly aligned with and started into their mating connectors on the backplane before applying pressure on the PCB or its card extractor tabs to seat it.

NOTE: When replacing the horizontal deflection board, the Horizontal Deflection Board (P/Ns 100566 & 102523) could be damaged if the board is not seated properly on the Backplane. This problem usually occurs when the HDB is removed and reinserted after a board failure or when changing the sweep reversal connector. A failure can occur if connector J11 on the HDB (located at the far right when viewing from the component side) does not connect completely with P11 on the backplane.

Model 330, 340SC, and 370SC Service Manual 4-21