4-4
BVM-D9H1U/D9H5U/D9H1E/D9H5E/D9H1A/D9H5A
Beam Current Protector Check
When the following parts (the parts to which the mark is
attached on the schematic diagram) are replaced, be sure to
perform the following checks.
P board ........ R582, R583, R584, R585, R586, R1504,
R1505, R1506
1. Turn off the main power.
2. Connect a DC ammeter and a 50 kΩ variable resistor
in series between the junction point of R1504 and
R1505, and TP513 (GND) on the P board.
[The junction point of R1504 and R1505 is the
positive (+) side. Adjust the 50 kΩ variable resistor to
its maximum resistance beforehand.]
3. Turn on the main power.
4. Connect the 1080/60i entire black signal (see note) to
input connector.
Note: 1125 (1080) entire black signal
5. Push the BRIGHTNESS and CONTRAST buttons to
their MANUAL positions (to turn the green LEDs on
the buttons.)
6. Set the BRIGHTNESS and CONTRAST buttons to
their mechanical center positions.
7. Confirm that the raster disappears from the CRT
screen when the DC ammeter reaches the following
value as the 50 kΩ variable resistor is turned to
decrease its resistance value gradually.
550 µA
8. Turn off the main power.
9. Remove a 50 kΩ variable resistor and a DC ammeter.
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