Pioneer AVX-505, Service Manual

Page: 49 / 72

49
AVX-505
6. ADJUSTMENT
-
Adjustment of the LCD 5.5 Monitor
1. Adjustment of Invertor Power Supply
1
TP3 voltage : Adjust VR2 so that the voltage is 22 ±0.1 V at room temperature.
2. Adjustment of Signal Power Supply
1
Adjustment of oscillation frequency : Observe the waveforms of Q902 collector, and adjust VR901 so that
oscillation frequency is 200 ±2 kHz.
2 TP103 voltage : Adjust VR902 so that the voltage is 5.1 ±0.05 V.
3
TP106 voltage : Adjust VR903 so that the voltage is -8 ±0.1 V.
4 TP107 voltage : Adjust VR904 so that the voltage is -15 ±0.5 V.
3. Adjustment of Output Waveforms
Input : Input gray-scale pattern of RGB separate signal (0.7 Vp-p/75
Ω
at termination) to RIN, GIN and BIN (CN1 @ , $
and
^
). Input composite synchronizing (CS) signal (1 Vp-p/75
Ω
at termination) to CIN (CN1
0
). YS is “H” or
OPEN.
1 TP305 waveform b : 9.0 ±0.1 V·········(VR302)
2
TP304 voltage : Should be within the range of 2.5 ±0.5 V and generate the greatest
difference between voltages of tone 0 and 1 of output waveforms of TP302.
·········(VR301)
3
TP702 waveform a-b voltage :3.1 ±0.05 V·········(VR304)
b-c voltage : 0 ±0.05 V·········(VR307)
4 TP701 waveform a-b voltage :3.1 ±0.05 V·········(VR305)
b-c voltage : 0 ±0.05 V·········(VR308)
5
TP703 waveform a-b voltage :3.1 ±0.05 V·········(VR306)
b-c voltage : 0 ±0.05 V·········(VR309)
6
TP702 waveform b-GND voltage :3.6 ±0.05 V·········(VR302)
7 TP701 waveform b-GND voltage :3.6 ±0.05 V······(Confirm)
8 TP703 waveform b-GND voltage :3.6 ±0.05 V······(Confirm)
If the waveforms of
7
and
8
do not conform with the standard, adjust
6
within a range of 3.6 ±0.1 V.
( 1 : See Fig. 1. 3 to 8 : See Fig. 2.)
4. Adjustment of Flicker
Display a pattern of horizontal stripes (gray and black alternately) and adjust to minimize flicker. Observe the
waveforms of TP801, and adjust VR802 to reduce the voltage of 100 mV DC.
Waveform of TP305 Waveforms of TP701, 702 and 703
Fig. 1 Fig. 2
GND GND
a
b
a
b
c