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1-44 (No. 52152)
X-RAY PROTECTOR ADJUSTMENT/CHECK
Measuring Instruments
Signal generator (All-white signal)
High-voltage voltmeter
DC voltmeter
Card (Slot)
Component/RGB Input Card (Slot 1)
Test Points
Anode of CRT
TP-XR, TP-GND [S. CORRECTION PWB]
Adjustment Points
VR501 (X-Ray Protector Adjustment VR) [S. CORRECTION PWB]
VR502 (High-Voltage VR) [S. CORRECTION PWB]
Note: Perform the following adjustment after completing the Screen Voltage Coarse adjustment.
(1) Turn the
VR502
fully clockwise (the minimum position).
(2) Turn the
VR501
fully counterclockwise (the minimum position).
(3) Set the CONTRAST and BRIGHT potentiometers on the front panel to the fully clockwise positions.
(4) Connect the high-voltage voltmeter to the anode of the CRT and turn the unit ON.
(5) Apply the 1080/60i all-white signal to INPUT A (Terminal Y on the Component/RGB Input Card).
(6) Turn the
VR502
slowly counterclockwise until the value of the high-voltage voltmeter is
27.0 kV ± 0.2 kV
.
(7) Connect the DC voltmeter across TP-XR and TP-GND.
(8) Turn the
VR501
clockwise until the voltmeter reading is
5.5 V
.
(9) Turn the
VR501
slowly clockwise until the point at which the X-ray protector starts operation.
(The power turns off at the first operation and then turns on again 5 seconds later. At the second operation, the power turns off
and the LED of the INPUT SELECT D of the front panel blinks. When two operations are done consecutively, it stops at the
stand-by position.)
(10)Turn the
VR502
slightly clockwise and turn the unit ON again.
(11) Turn the
VR502
slowly counterclockwise and check the point at which the X-ray protector starts to operate.
Check that the high-voltage voltmeter value at which the X-ray protector starts to operate, is
27.0 kV ± 0.2 kV
.
(12)Apply adhesive for fixing the
VR501
in the adjusted position.
(13)Set the CONTRAST and BRIGHT potentiometers on the front panel to the center click positions.
(14)Turn the
VR502
fully clockwise (the minimum position).
4.10.3 X-RAY PROTECTOR ADJUSTMENT/CHECK
S. CORRECTION PWB
MAIN PWB
Front side
TP-XR
TP-G
Front side
(Min)
(Max)
(Min)
(Max)
VR505 [CONV_V]
VR504 [CONV_H]
VR502 [H.VOLTAGE]
VR501 [X-RAY]
CN0RD
CN00R
(Top surface view of the S. CORRECTION PWB)
VR505
VR504
VR502
VR501
CN0RD
CN00R
VR502
VR501