Iiyama A902MT, Service Manual

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1-4. POWER FACTOR CIRCUIT confirmation [PWB-MAIN]
1)
2)
3)
4)
5)
6)
Receive a cross-hatch inverted signal of MODE 5.
Turn OFF the Power Switch.
Connect the DC voltmeter between TP4 and TP0.
Turn ON the Power Switch.
Confirm that the voltage is DC 400±10V.
Remove the DC voltmeter.
1-6. FH-LIMITER confirmation
1)
2)
3)
4)
5)
6)
7)
Receive a cross-hatch inverted signal of fH 29.2kHz.
Confirm that the picture disappears. Also, make sure the horizontal
oscillation frequency is within the specified range: 58-62kHz.
Receive fH 30.9kHz and confirm that the picture is synchronized.
Receive fH 118.0kHz and confirm that the picture disappears. Also, make
sure the horizontal oscillation frequency is within the specified range above.
Receive fH 77.8kHz and confirm that the picture is synchronized.
Turn OFF the power of signal generator and confirm that the picture
disappears. Also make sure the horizontal oscillation frequency is within
the specified range above.
Remove the frequency counter.
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1-7. H-BLANKING confirmation
1)
2)
3)
4)
5)
Receive a cross-hatch inverted signal of MODE 5.
Minimize the horizontal size (H-size) with the front buttons.
Select DA TEST 3 and press the MENU Button so that the automatic
confirmation program starts.
Confirm that X of the right hand side figure is as follows: X </= 3.0mm.
Adjust the horizontal size roughly with the front buttons.
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Picture Raster rolling
x
1-5. TEMPERATURE SENSOR confirmation
1)
2)
3)
Receive a cross-hatch inverted signal of MODE 5.
Select CRT Check and press the MENU Button.
Confirm that respective temperature of CRT fannel and monitor front
displayed on the screen is as follows: actual temperature ±5°C.
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35
30 CRT Check
CRT
fannel
Monitor
front
* * * *