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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.
Alignment and Adjustments
4-3 Beam Alignment
PRECAUTION
1. Input a crosshatch and dot pattern. 2. Select the �STANDARD� video mode. 3. Warm up the TV for at least 10 minutes. 4. Connect an audio oscillator to the pin jig between GT401~GT402 (located on the deflection PCB) and GND. 5. Determine the ZERO-magnet area (using the beam-alignment CY) 6. Check the squarewave at the point where the focus is misaligned (Use an audio oscillator).
(Creation of CPM Zero Magnet)
(Creation of the 2-pole/4-pole zero magnets)
ADJUSTMENT
1. Cover the Red and Blue lenses. 2. Adjust the Green lens as shown in the figures below
G-FOCUS CORE
Varying the 2-pole of VM (Varying G-Focus Pack) G-FOCUS CORE (Positioning the Core in the Center)
Varying the 4-pole of VM (When VM 2-Pole Adjustment is completed) (Adjust until the light around the core becomes a circle)
3. Adjust the G-Focus until any light around the core disappears. 4. Cover the Green and Blue lenses. 5. Adjust the Red lens using the same method as with the Green lens. 6. Note: The Blue lens is not adjusted because its focus varies little (VM-coil is installed). 7. After the adjustments are completed, disconnect the jig pin connector.
4-6
Samsung Electronics
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