Sim2 SVD800 HD Millennium, Руководство по обслуживанию

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SVD800HD
SERVICE GUIDE
page - 7 -
PC132 MODULE: EHT and dynamic focus
A section includes the adjustments pre-set in the Factory.
B section includes the adjustments to be performed in service when the unit is replaced.
A section (Factory adjustments)
1. The adjustments have to be executed, step by step, in the same sequence described below:
2. Adjusting and Testing of the EHT Generator Circuit:
3. Connect a Digital Multimeter with High Voltage Probe to the EHT splitter (removing one EHT cable)
4. Rotate the trimmers:
5. P1 fully clockwise (average beam current protection on the three tubes)
6. P4 fully counter clockwise (EHT protection n.1 – fly-back)
7. P5 fully clockwise (EHT protection n.2)
8. Switch the mains ON.
9. Select a black-page pattern 0,7 Vpp RGB signal.
10. Adjust Contrast to 100 and Brightness to 50 and memorise these values.
11. Select a white-page pattern 0,7 Vpp RGB signal.
12. Select the 6500
°
K colour temperature.
13. Wait 20’ (warm-up time).
14. Switch the three CRTs OFF using the key “MUTE” on the remote control.
15. Adjust P3 for 33,5 ± 0,1 kV
16. Seal P3 with LOCTITE 454 adhesive.
17. Switch the three CRTs ON.
18. Verify that the EHT voltage is 33,5 ± 0,1 kV.
19. Switch the mains OFF.
20. Remove the High Voltage Probe from the EHT splitter and insert the EHT cable.
Adjusting and Testing of the EHT Protection Circuit:
1.
Rotate P4 slowly clockwise until the protection circuit will be activated (EHT OFF and DL1 ON, after 10 seconds
the projector goes to stand-by mode).
2. Rotate P4 fully counter clockwise.
3. Connect the Digital Multimeter between GND2 and TP12.
4. Switch the projector ON by remote control.
5. Measure the voltage and write the value down.
6. Connect the Digital Multimeter between GND2 and TP5.
7. Adjust P4 for a voltage 0,1
±
0,01 V less than the value reed on step 2.5 (this operation is equivalent to set the EHT
protection N.2 threshold to 37,5
±
0,5 kV).
8. Seal P4 with LOCTITE 454 adhesive.
9. Check that the voltage on TP5 is not changed after P4 sealing.
10. Rotate P1 slowly counter clockwise until the protection circuit will be activated (EHT OFF and DL1 ON, after 10
seconds the projector goes to stand-by mode).
11. Rotate P1 fully clockwise.
12. Connect the Digital Multimeter between GND2 and TP4.
13. Switch the projector ON by remote control.
14. Adjust P1 for a voltage of 4,5
±
0,1 V (this operation is equivalent to set the EHT protection N.1 threshold to 37,5
±
0,5 kV).
15. Seal P1 with LOCTITE 454 adhesive.
16. Check that the voltage on TP4 is not changed after P1 sealing.
17. Connect the Digital Multimeter between GND1 and TP7.
18. Adjust P5 for a voltage of 0,9
±
0,01 V (this operation is equivalent to set the Average Beam Current Protection to
4,0
±
0,2 mA).
19. Connect the Digital Multimeter between GND1 and TP8.
20. Set contrast to 0 by remote control.
21. Connect R64 (reference side) to ground with a wire.
22. Increase the contrast value slowly and check that the protection circuit is activated when the voltage reaches the
value of -17,0
±
0,5 V (EHT OFF and DL1 ON, after 10 seconds the projector goes to stand-by mode).
23. Remove the ground-wiring from R64.
24. Seal P5 with LOCTITE 454 adhesive.