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ADJUSTMENT PROCEDURES
SCREEN VOLTAGE ADJUSTMENT AND FOCUSING COARSE ADJUSTMENT
SCREEN VOLTAGE ADJUSTMENT AND FOCUSING COARSE ADJUSTMENT
Measuring Instruments
Card (Slot)
Test Points
Adjustment Points
Note: Ensure that the value of CC41 (CPU BLOCK) in the Service Menu is "000".
1. Turn the SCREEN VR fully counterclockwise.
2. Connect the oscilloscope across TP-47B and TP-GND and turn the unit ON.
3. Apply the 1080/60i component all-black signal to INPUT A.
4. Turn the SCREEN VR slowly clockwise until the raster lights up slightly.
5. Set the value of CC41 (CPU BLOCK) in the Service Menu from "000" to "003".
6. Turn the SCREEN VR slowly clockwise until the voltage amplitude <A> of the
AKB pulse at TP-47B is about 15 V.
7. Observe the waveforms at TP-47R and TP-47G to ensure that the V.BLK pulse is
present.
If V.BLK is not clear, adjust the SCREEN VR so that the voltage amplitude <A> of
the AKB pulse at TP-47R and TP-47G becomes 15 ± 2 V.
8. Apply the 1080/60i crosshatch signal to INPUT A.
9. Adjust the FOCUS VR1 and VR2 so that the entire image is in focus.
HIGH-VOLTAGE COARSE ADJUSTMENT
HIGH-VOLTAGE COARSE ADJUSTMENT
Measuring Instruments
Card (Slot)
Test Points
Adjustment Points
Note: Perform the following adjustments after completing the Screen Voltage and Focusing Coarse adjustments.
1. Turn VR502 fully clockwise (the minimum position).
2. Turn VR501 fully counterclockwise (the minimum position).
3. Connect the high-voltage voltmeter to the anode of the CRT and turn the unit ON.
4. Apply the 1080/60i crosshatch signal to INPUT A (Terminal Y on the Component/RGB Input Card).
5. Turn VR502 slowly counterclockwise until the value of the high voltage is about 25 kV.
6. Adjust the FOCUS VR1 and VR2 so that the entire image is in focus.
S. CORRECTION PWB
MAIN PWB
40
Signal generator (All-black signal, Crosshatch signal)
Oscilloscope
Component/RGB Input Card (Slot 1)
TP-47B, TP-47R, TP-47G [CRT SOCKET PWB]
TP-GND [CRT SOCKET PWB]
SCREEN VR [Bottom potentiometer on high-voltage transformer]
FOCUS VR1 [Top potentiometer on high-voltage transformer]
FOCUS VR2 [Middle potentiometer on high-voltage transformer]
CC41 (AKB Setting) [Service Menu]
Signal generator (Crosshatch signal)
High-voltage voltmeter
Component/RGB Input Card (Slot 1)
Anode of CRT
VR502 (High-Voltage VR) [S. CORRECTION PWB]
FOCUS VR1 [Top potentiometer on high-voltage transformer]
FOCUS VR2 [Middle potentiometer on high-voltage transformer]
TP-XR
TP-G
(Top surface view of S. CORRECTION PWB)
Front side
(V. sync)
<A>
15V ± 2V
AKB pulse
Front side
VR502
VR501
(Max)
(Min)
(Min)
(Max)
1 Vertical interval
V.BLK
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