Zenith R50W46, Service Manual, Page: 13 / 58

(3) Turning green focus volume right and adjust 2-Pole
magnet so the position to coincide that of item ”(2)”.
(4) Adjust not to shift the screen by turning green focus
volume clockwise and counter clockwise.
(5) If the screen shifts, readjust (2)~(4).
(6) Do the same method in Red and Blue.
2-4. Beam Shape(4 & 6-Pole Magnet)
Adjustment
(1) Do after 2-Pole magnet adjustment.
(2) Make Green raster using lens cover and turn the focus
volume right.
(3) Make the dot in the center a perfect circle using 4 & 6-Pole
magnet.
(4) Do the same method in Red & Blue.
(5) Fasten the Magnet after adjustment.
(6) Adjust focus accurately.
3. Centering Magnet Adjustment
3-1. Preliminary steps
(1) Receive the image signal.
(2) Select INSTART key on the Service Remote and then
select “0 RASTER ADJ” move the cursor or using the key
No..
(3) When selecting the adjustment mode, the convergence
resets automatically and then preparation for adjustment
complete.
3-2. Adjustment
(1) Execute adjustment of Red, Green and Blue centering
Magnet.
Locate the Green centering Magnet in middle.
(2) Application the SGS THOMSON CONVERGENCE ASSY,
adjust center of Blue image signal from the center of Green
image signal 30
!
3mm in order to reach this standing with
the left side, adjust center of Red image signal from the
center of Green image signal 30
!
3mm in order to reach
this standing with the right side
(3) After adjustment complete, exit the RASTER adjustment
mode using ENTER key and exit the SVC adjustment
mode using INSTART key.
4. High Voltage Regulation Adjustment
4-1. Test Equipment
Digital Multi-Meter(DMM)
4-2. Preliminary steps
Select INSTART key on the Remote Control and then select
“1 HIGH VOLTAGE ADJ” move the cursor or using the key
No..
(Manual adjustment : setting contrast/bright to 0 (A/V no
signal))
4-3. Adjustment
(1) Connect DMM to the P415(+), P416(-) of Deflection Board.
(2) Adjust VR401 so that the P415(+), P416(-) voltage is
21.7
!
0.1V. (High voltage 31.5KV)
(3) After adjustment complete, exit the High Voltage
adjustment mode using any key and exit the SVC
adjustment mode using INSTART key.
5. CUT-OFF Voltage Adjustment
5-1. Preliminary steps
(1) Select INSTART key on the Remote Control and then
select “2 SCREEN ADJ” move the cursor or using the key
No..
(2) Adjustment must be operated in a dark room (simple dark
room)
5-2. Adjustment
(1) Test Equipment: Oscilloscope, 100:1 Probe
(2) Connect oscilloscope to cathode of R, G, B(R926R/B/G:
SCREEN ADJ on the PCB) and GND.
(3) Turning Screen Volume (R/G/B) in Focus Pack and adjust
R/G/B is 165V
!
0.5V.
(4) After adjustment complete, exit the CUT-OFF adjustment
mode using ENTER key and exit the SVC adjustment
mode using INSTART key.
- 13 -
ADJUSTMENT INSTRUCTIONS
2 Pole Magnet
4 Pole Magnet
6 Pole Magnet
0V
165V
±
0.5V