Philips 37PF9946/12 Repair Manual download pdf (Page 57)

Alignments

EN 57SDI PDP 8.

8.3 Alignments 42” SD v3

1. Put the dipswitches on the Logic Board in the internal

position to get a Full White Pattern.

2. You can find the location of the test point and

potentiometers in Figure “Potentiometer locations”.

3. Adjust Vsch to 40 V with VR5004.

4. Check the waveform with an Oscilloscope.

• Take the trigger signal from the testpoint marked “V-

sync” on the Logic Board.

• Connect the testpoint marked “OUT 4”, located in the

centre of Y_buffer Board to the other channel, and then

check the first Subfield operating waveform of one TV-

Field.

• Check the waveform again after adjusting Horizontal

Division. Check the Reset waveform when the

V_TOGG Level is changed.

• Set the Vset to 10µs by adjusting VR5002.

• Set the Falling maintenance time to 30 µs by adjusting

VR5003.

• Change the waveform position of Oscilloscope to the

3rd Subfield and then set the Falling maintenance time

to 30µsby adjusting the VR5001. GND maintenance

section should be checked after the Vertical Division is

readjusted to '2 V or 5 V'.

Special notice: It is very important, that you execute this

adjustment on the 1st Sub-Field (SF) of the 1st Frame of the

Reset waveform and then move to the 3rd Sub-field for

adjusting.

Figure 8-13 DIP switch mode: External

Figure 8-14 DIP switch mode: Internal

Figure 8-15 TCP ramp waveform inclination adjustment (Y-Board)

1 2 3 4

Adjust VR5003 to set the time of

Yfr (Falling Ramp_1st) 30

µs

Adjust VR5002 to set the time of

Yrr (Rising Ramp) 10

µs

Adjust VR5001 to set the time of

Yfr (Falling Ramp_3rd) 30

µs

Adjust VR5004 to set the voltage of

Vsch (Scan high voltage) 40 V

rising maintenance time

falling maintenance time

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Philips 37PF9946/12 Repair Manual Page 57

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