3-2
BVM-A14
14. Input the 1080/60i (1125) monoscope signal (fh=15.73
kHz) to the BKM-68X (analog component input
adaptor).
15. Check that when the BRIGHT and CONTRAST
buttons are rotated from MIN to MAX, the ABL
operates. (The OVER LOAD LED should light in
orange, and the maximum reading of the current meter
should be the value below.)
1.10 ± 0.20 mA (4:3)
0.90 mA (16:9)
16. Remove the DC ammeter.
17. Remove the jumper between pins 3 and 4 of the
CN703 of the PC board.
18. Connect the CN703 connector of the PC board.
Beam Current Protector Check
Perform the following checks when the following parts (
on the schematic diagram) have been replaced.
PA board .... R602, R603, R604, R605, R606, R607,
IC601, Q601, Q602, D601, D608, D609
PC board .... R701, R702, R703, R704, R705, R706
BK board ... R604, R605, IC009
1. Turn OFF the power.
2. Disconnect the CN703 connector of the PC board.
3. Connect a DC ammeter between pins 1 and 2 of
CN703 of the PC board.
4. Short-circuit between pins 3 and 4 of CN703 of the PC
board using a jumper.
5. Short-circuit between TP503 and TP502 (GND) of the
PA board using a jumper.
(Disable ABL.)
6. Turn ON the power.
7. Input the 1080/60i (1125) 100% all white signal.
8. Press the BRIGHT and CONTRAST buttons to set the
MANUAL state. <The LED (green) on the button goes
ON.>
9. Turn the BRIGHT and the CONTRAST starting from
the MIN end toward the MAX end gently. When the
ammeter reading reaches the following value, confirm
that the protectors do not operate.
1.25 mA
10. Turn the BRIGHT and the CONTRAST starting from
the MIN end toward the MAX end gently. When the
ammeter reading reaches the following value, confirm
that the protectors operate [OVER LOAD LED on the
front of monitor is gently flashed].
1.50 ± 0.25 mA
11. Turn OFF the power.
12. Remove the jumper from between TP503 and TP502
(GND) of the PA board.
13. Turn ON the power again.
+0.20
_0.15
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