Toshiba PJTV6 Schematic

NTDPJTV06

REV 1297

QUICK REFERENCE GUIDE N5SS CHASSIS

PROJECTION TELEVISION

TW40F80

Contents

DISASSEMBLY............................................................3

1. Front....................................................................................................................................................... 3

2. Rear........................................................................................................................................................ 5

CRT ADJUSTMENTS ................................................6

1. Template Instructions........................................................................................................................... 6

2. Optical and Electrical Focus................................................................................................................ 6

3. Mechanical Tilt ................................................................................................................................... 7

4. User Convergence ................................................................................................................................ 8

5. Magnetic Centering ............................................................................................................................. 8

6. Electrical Centering............................................................................................................................. 8

7. Green Geometry................................................................................................................................... 9

8. Red Convergence ............................................................................................................................... 10

9. Blue Convergence .............................................................................................................................. 11

10. White Balance ................................................................................................................................... 11

11. WID, HIT, & VLIN.......................................................................................................................... 12

BLOCK DIAGRAMS.................................................13

1. System .................................................................................................................................................. 13

2. Power Supply ...................................................................................................................................... 14

3. Video .................................................................................................................................................... 15

4. Audio.................................................................................................................................................... 16

5. Deflection............................................................................................................................................. 17

TROUBLESHOOTING FLOW CHARTS ..............18

1. Shut down............................................................................................................................................ 18

1. Front

DISASSEMBLY

3.Retract the two screws located near the bottom of the x-ray shield. Loosen the top two screws. Slide the shield to the right and downward, then pull it away from the cabinet.

1.Retract the two screws located at the bottom of the speaker grill. Then, remove the speaker grill from the cabinet.

2.Retract the two screws located on the front service panel. Remove the panel by lifting up and pulling the bottom out and away from the cabinet.

4.Retract the four screws located at the bottom of the Front-LED panel. This panel will still be attached to the cabinet via the FrontLED board’s wiring harness.

5.Retract the two screws located near the Front-LED P.C. board. Remove the FrontLED P.C. board from the panel and pull the panel away from the cabinet.

6.Retract the four screws located at the bottom of the bezel. Pull the bezel away from the cabinet while lowering the top of the bezel to the floor. The bezel will still be attached to the cabinet via the Front-control board’s wire harness.

8.Pull the two brass clips up and away from the screen. Then, remove the lenticular and fresnel screens by lifting them up and away from the cabinet.

7.Retract the two screws located near the Front control PC board. Remove the PC board from the bezel. Pull the bezel away from the cabinet.

This completes the front disassemby

procedure.

2. Rear

1.Remove seven (7) wood screws and four (4) brass screws on the back panel and remove the back panel.

2.Remove the five (5) screws that secure the PC board chassis to the cabinet.

4.Partially slide both PC board chassis out from the cabinet. Release the wires from thier harness clips located at the bottom front of the cabinet. Slide both chassis to approximately 50% of the way out from the cabinet.

5.Lift the corner of each chassis frame while sliding both chassis completely out of the cabinet.

3.Release the wires from their harness clips. Remove the brass screw securing the grey plastic tray to the inside of the cabinet and remove the tray.

6.Stand both chassis frames up on end with the solder sides of the PC boards facing outward. The TW40F80 is now in the proper service position.

CRT ADJUSTMENTS

1. Template Instructions

CAUTION: Use only water and a damp cloth to clean an overlay. Any other cleaning substance may cause damage.

Both the TW40F80 and TW56F80 are converged at four separate screens. In order to reduce the number of times a template must be installed and centered, two screens have been printed on each template.

On PSOL4001, the SOLID lines are for the FULL crosshatch and the DASHED lines are for the WIDE#1 crosshatch.

On PSOL4002, the SOLID lines are for the WIDE#2 crosshatch and the DASHED lines are for the WIDE#3 crosshatch.

2. Optical and Electrical Focus

Always allow the set to warm up for at least 15 minutes before making CRT adjustments.

The TW40F80 and TW56F80 should be in the WIDE 1 picture size for these adjustments.

1. Follow the appropriate disassembly

instructions to gain access to the CRTs.

2. If the wing nuts on the lenses are pointed toward the screen, reverse the lenses on each tube so the wing nuts are facing the back of the set. Leave the lenses in this position after servicing. Put the screen assembly back on.

The 56” templates are manufactured the same way. PSOL5601 contains the FULL and WIDE#1 crosshatch patterns. PSOL5602 contains the WIDE#2 and WIDE#3 crosshatch patterns.

The templates for the TW40F80 are centered by aligning the four corner brackets (located on each template) with the inner border that outlines the screen’s viewing area.

For the TW56F80, temporarily install the template on the screen. Locate the center of the screen by stretching two pieces of string diagonally across it, corner to corner. Align the template’s center crosshairs with the center point of the screen.

Secure each template to the bezel with low tack tape. To reduce parallax error, place the template as flat against the screen as possible.

3. Enter the service mode by pressing MUTE on the remote control. Press and hold the MUTE key a second time, while pressing the MENU key on the set’s front control panel. An “S” appears in the upper right corner of the screen, indicating the set is in the Service Mode. Press the MENU key again to enter the service adjustment mode, and “RCUT” appears in the upper left corner of the screen. Press the 7 key to display the convergence cross hatch pattern.

+ 12 hidden pages