4-2
VPH-G90E/G90U/G90M
11. Adjust RV100 to set the high voltage to 33 kV.
High voltage adjustment specification (during
CUTOFF): 33.0
±
0.3 kV
12. Turn OFF the power, and cover RV250 with a rotation
stopper cap and apply RVT to fix it.
13. Turn ON the power, and check that the high voltage is
within the specification.
High voltage adjustment specification (during
CUTOFF): 33.0
±
0.3 kV
14. Check that the high voltage variation when the
CONTR and BRIGHT are set to MIN and set to MAX
using the remote commander is within the
specification.
High voltage variation specification:
+
0.2/
_
0.3 kV
*
If the specifications are not satisfied, perform Steps
10 to 13 again.
*
When readjusting RV100 and RV250, replace the
VR and rotation stopper caps before readjustment.
15. Set CONTR and BRIGHT to 80 and 50 respectively
using the remote commander.
RTV
RV100/RV250
VR rotation stopper cap
PA board
RV100
HV REG
VOL
VOL
HV PROT
RV250
4-2. CRT PROTECTOR ADJUSTMENT
1. Connect a variable current source (3.5 mA to 4.5 mA)
between the cathode terminal (pin 8 of CRT socket) of
the CBR (CBG and CBB) board and B
+
12 V line of
the CDR (CDG and CDB) board.
2. Connect a pull-up resistor (4.7 k
Z
) between pin 3 of
CN244 (CN264 and CN284) and
+
5 V line of the CDR
(CDG and CDB) board, then connect an oscilloscope to
it.
3. Gradually raise the output of the variable current
source, and adjust RV965 of the CAR (CAG and CAB)
board so that the waveform on the oscilloscope changes
from “High” to “Low” level at 3.9
±
0.1 mA.
Summary of Contents for VPH-G90E
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Page 122: ...2 2 VPH G90E G90U G90M 2 1 3 Location 3 ME MB MC PB M L MA BA F BC NA BB ...
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Page 337: ...9 1 9 1 VPH G90E G90U G90M SECTION 9 BLOCK DIAGRAMS ...
Page 363: ...2 3 4 5 A B C D E F G H 1 10 1 10 1 VPH G90J G90E G90U G90M SECTION 10 DIAGRAMS ...
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