4-2
BVM-D32E1WA/D32E1WE/D32E1WU
Beam Current Protector Check
Perform the following checks when the following parts (
on the schematic diagram) have been replaced.
PA board ........... R514, R515, R516, R517, R521,
R522, IC502, Q501, Q502, D501,
D503, D901
PC board ........... R804, R805, R806, R807, R808,
R809
BK board........... R912, R913, IC901
1. Turn OFF the power.
2. Connect the CN3 connector of the PC board.
3. Connect a direct current meter between pins 1 and 2 of
CN3 of the PC board.
4. Short-circuit between pins 3 and 4 of CN3 of the PC
board using a jumper.
5. Short-circuit between TP502 and TP504 (GND) of the
PA board using a jumper.
6. Turn ON the power.
7. Input the HD (1125) 100% all white signal.
8. Press the BRIGHTNESS VR and CONTRAST VR
buttons to set the MANUAL state.
[ The LED (green) on the button goes off. ]
9. Turn the BRIGHTNESS VR and the CONTRAST VR
starting from the MIN end toward the MAX end
gently. When the ammeter reading reaches the 1.60
mA, confirm that the protectors do not operate.
10. Turn the BRIGHTNESS VR and the CONTRAST VR
starting from the MIN end toward the MAX end
gently. When the ammeter reading reaches the
following value, confirm that the protectors operate.
Specifications : 1.61 mA to 2.10 mA
11. Turn OFF the power.
12. Remove the jumper from between TP502 and TP504
(GND) of the PA board.
13. Turn ON the power again.
14. Input the monoscope signal (fH = 15.73 kHz).
Check that when the BRIGHTNESS VR and CON-
TRAST VR buttons are rotated from MIN to MAX,
the ABL operates (The OVER LOAD LED goes off in
orange. The maximum reading of the current meter
should be the value below).
Specifications : 1.30 mA to 1.58 mA
15. Remove the direct current meter.
16. Remove the jumper between pins 3 and 4 of CN801 on
the PC board.
17. Connect the CN801 connector of the PC board.
To Next Page
Loading...
