SVD800HD
SERVICE GUIDE
page - 11 -
PC131 MODULE: video processor
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.
Adjusting and Testing of the total (three CRTs active) Average Beam Current Limitation Circuit
1.1
Switch the mains ON.
1.2
Adjust P1 and P2 fully anticlockwise.
1.3
Select a white-page pattern 0,7Vpp RGB signal.
1.4
Adjust Contrast to 100 and Brightness to 50 and memorise these values.
1.5
Connect a Digital Multimeter between GND1 and TP8 (PC132 board).
1.6
Adjust P1 (PC131) for – 13,0
±
0,1 V (this operation is equivalent to set the average beam current limitation
circuit of three tubes to 3,0
±
0,1 mA).
1.7
Switch the projector OFF by remote control.
1.8
Seal P1 with LOCTITE 454 adhesive.
1.9
Switch the projector ON by remote control.
1.10
Check that the voltage on TP8 is not changed after P1 sealing.
2.
Adjusting and Testing of the single CRT Average Beam Current Limitation Circuit
2.1
Connect the Digital Multimeter between GND1 and TP8 (PC132).
2.2
Switch the Red and the Blu CRTs OFF using the keys R and B of the remote control.
2.3
Adjust P2 (PC131) for – 8,0
±
0,1 V (this operation is equivalent to set the average beam current limitation
circuit of a single tube to 2,1
±
0,1 mA).
2.4
Switch the projector OFF by remote control.
2.5
Seal P2 with LOCTITE 454 adhesive.
2.6
Switch the projector ON by remote control.
2.7
Check that the voltage on TP8 is not changed after P2 sealing.
2.8
Remove the Digital Multimeter probes.
A section (service adjustments)
1.
Adjusting and Testing of the total (three CRTs active) Average Beam Current Limitation Circuit
1.1
Switch the mains ON.
1.2
Adjust P1 and P2 fully anticlockwise.
1.3
Select a white-page pattern 0,7Vpp RGB signal.
1.4
Adjust Contrast to 100 and Brightness to 50 and memorise these values.
1.5
Connect a Digital Multimeter between GND1 and TP8 (PC132 board).
1.6
Adjust P1 (PC131) for – 13,0
±
0,1 V (this operation is equivalent to set the average beam current limitation
circuit of three tubes to 3,0
±
0,1 mA).
1.7
Switch the projector OFF by remote control.
1.8
Seal P1 with LOCTITE 454 adhesive.
1.9
Switch the projector ON by remote control.
1.10
Check that the voltage on TP8 is not changed after P1 sealing.
2.
Adjusting and Testing of the single CRT Average Beam Current Limitation Circuit
2.1
Connect the Digital Multimeter between GND1 and TP8 (PC132).
2.2
Switch the Red and the Blu CRTs OFF using the keys R and B of the remote control.
2.3
Adjust P2 (PC131) for – 8,0
±
0,1 V (this operation is equivalent to set the average beam current limitation
circuit of a single tube to 2,1
±
0,1 mA).
2.4
Switch the projector OFF by remote control.
2.5
Seal P2 with LOCTITE 454 adhesive.
2.6
Switch the projector ON by remote control.
2.7
Check that the voltage on TP8 is not changed after P2 sealing.
2.8
Remove the Digital Multimeter probes.
Summary of Contents for SVD800 HD Millennium
Page 2: ...SVD800HD SERVICE GUIDE page 2 WHITE PAGE...
Page 34: ...1 2 3 5 6 9 8 7 4...
Page 35: ...1 2 3 4 5...
