Iiyama Vision Master 405, Руководство по обслуживанию

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1-3. FH-LIMITER confirmation
1)
2)
3)
4)
5)
6)
7)
Receive a cross-hatch inverted signal of fH 27.3kHz.
Confirm that the picture disappears. Also, make sure the horizontal
oscillation frequency is within the specified range: 59-61kHz.
Receive fH 30.0kHz and confirm that the picture is synchronized.
Receive fH 87.5kHz and confirm that the picture disappears. Also, make
sure the horizontal oscillation frequency is within the specified range above.
Receive fH 85.0kHz 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.
n
- 3 -
Note: SCREEN VR should not be turned after the adjustment above.
1-1. ANODE VOLTAGE adjustment [PWB-MAIN]
1-2. SCREEN VOLTAGE adjustment [PWB-MAIN]
1)
2)
3)
4)
Receive a cross-hatch inverted signal of MODE 5.
Turn ON the Power Switch.
Connect a high-voltage probe between the SC connector on the PWB-
VIDEO and GND (chassis).
Adjust the screen voltage to 630±10V with SCREEN VR located lower of
T501 (FBT).
1)
2)
3)
4)
5)
6)
7)
Receive a cross-hatch inverted signal of MODE 5.
Turn OFF the Power Switch.
Connect a high-voltage probe between CRT anode and GND (chassis).
Turn ON the Power Switch.
Adjust the high-voltage to 25.0±0.1kV with VR503 (HV-ADJ).
Confirm the variation of high-voltage is within ±0.2kV when receiving MODE
2 and MODE 6 respectively.
Turn OFF the Power Switch and remove the high-voltage probe.
WARNING !
VR501 (HV-ADJ) has been carefully factory-adjusted for each unit in order
to satisfy regulations regarding X-radiation.
Further adjustment on VR501 shall not be performed.
In case of adjustment, the adjusted position of VR501 must be fixed by a
soldering iron to prevent it from rotating.
Voltage
S
CR
EEN
T501(FBT)
Voltage
VR503 HV-ADJ