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Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this tuner.
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I have this hi-fi system for a long time and I need to repair some things. Founding this manual will be very helpfull :)
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It is pretty good. The schematics were covered all components, the manual also provide the parts list . It's useful for the trouble shooting.
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Very fast service, best quality of the service manual and the schematics
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This service manual of the old video cassette recorder VT-LC50EM is very good readable even the tiniest numbers (i.e. IC-pins). The circuits are very clear. Many details of the schematic are very good described but in GERMAN language. Many schematic details - but complete at all. Common background information of several details are enclosed and physical knowledge of the TFT liquid crystal display for example. The manual lacks PCB drawings. If you understand german I would recommend this manual for you.
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.
3 � 14
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