21HF2-SS
2. PURITY ADJUSTMENT
No. 1 Adjustment point PURITY ADJ. Adjustment condition/procedure 1. Receive the GREEN-ONLY signal. Adjust the beam current to ~700 μA. 2. Degauss the CRT enough with the degausing coil. NOTE: Follow the Job Instruction Sheet to adjust the magnetic field. (Reference: page 3-12) 3. Maintain the purity magnet at the zero magnetic field and keep the static convergence roughly adjusted.. 4. Observe the points a, b as shown in Fig. 1-1 through the micro scope. Adjust the landings to the A rank requirement. 5. Orient the raster rotation to 0 eastward.. 6. Tighten up the deflection coil screws . �Tightening torque: 108 20 N (11 ± 2 kgf) 7. Make sure the CRT corners landing meet the A rank require ments. If not, stick the magnet sheet to correct it. NOTE: Note: This adjustment must be done after warming up the unit for 30 minutes or longer with a beam current over 700 μA. NOTE: Note: Set the service mode by JA304 & JA307 (short) then press factory process R/C RGB key to change to RGB mono colour mode. * For the following colours press R/C RGB(Hex 7E) key to change. Waveform or others
a
b
30mm
F ig. 1-1
30mm
A
B A=B
F ig. 1-2 R ank "A" (on the right of the C R T )
GR E E N ONLY
B LUE ONLY S ignal-colour s creen cleared
RED ONLY
A
B A=B
F ig. 1-3
R ank "A" (on the left of the C R T )
*Press R/C RGB key for 1 second in NORMAL MODE, the colour will change to RGB mono colour mode.
