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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.
20A1-RU 21A1-RU 21A2-RU
FUNCTION OPERATION CHECKING (VIDEO AND AUDIO)
(Continued) No. point Adjusting procedure/conditions Waveform and others
No. point Adjusting procedure/conditions Waveform and others 1 CONTRAST 1. Receive "Monoscope Pattern" signal.
key 2. Set P-Mode to select CONTRAST. 9 1. Receive the "PAL COLOUR BAR" signal, press
3. Press Volume Up/Down key to check whether the the COLOUR SYSTEM key to select modes exerly. Then, select the "PAL" mode. Check again its colour so that it is working properly. 2 COLOUR key 1. Receive "Color Bar" signal. thru AV, press COLOUR SYSTEM key to select 3. Press Volume Up/Down key to check whether modes except N4.43/3.58, check the COLOUR the COLOUR effect is OK or not. is not working properly. Then, select the "NTSC 4.43/3.58" mode. Check again its colour so that it
CONTRAST effect is OK or not. cept PAL, check the COLOUR is not working prop-
2. Receive "NTSC 4.43/3.58 COLOUR BAR" signal 2. Set P-Mode to select COLOUR.
3 BRIGHTNESS 1. Receive "Monoscope Pattern" signal. is working properly.
key 2. Set P-Mode to select BRIGHTNESS.
3. Press Volume Up/Down key to check whether 10 SOUND 1. Receive "PAL-D/K" signal, press the "SOUND
BRIGHTNESS effect is OK or not. SYSTEM SYSTEM" to select B/G, I. Check the sound output is not working properly. Select D/K and check the sound output to make sure it is working properly. 2. Receive "PAL-I" signal, press the "SOUND SYSTEM" to select B/G, D/K. Check the sound output is not working properly. Select I and check the sound output to make sure it is working properly. 3. Receive "PAL-B/G" signal, press the "SOUND SYSTEM"to select I, D/K. Check the sound outthe sound output make sure it is working propKey 2. Set P-mode to select SHARPNESS. erly. 3. Press Volume Up/Down key to check whether 11 NOISE MUTE 1. Receive "PAL COLOUR BAR" signal. CHECKING 2. Turn up the volume control to maximum, make sure sound is heard from the speakers. Then put the unit in no signal state. 3. Check the sound mute is effective. 4. Finally turn sound level of CTV to minimum.
4 TINT key 1. Receive the "NTSC Colour Bar" signal thru AV in.
2. Set P-Mode to select TINT. 3. Press Volume Up/Down key to check TINT, UP
GREEN direction and DOWN for PURPLE direction whether is OK or not.
5 SHARPNESS 1. Receive "Monoscope Pattern" signal. put is not working properly. Select B/G and check
10
10-1 10-2
the SHARPNESS effect is OK or not.
6 CH DISPLAY 1. All Ch (1~99) will have an OSD display of the
COLOUR channel number in green colour under AFT ON
condition.
7 NORMAL Key 1. Once in PICTURE Mode, theNORMAL key Notes:If nothing is display 12 LANCheck OSD LANGUAGE quantity and type as Eng-
is pressed, all the settings will be present to normean contrast, colour, bright, GUAGE lish and Russian. mal setting. tint, sharpness are all in norQUANTITY (Normal setting value for every mode). mal setting. CHECK
» CONTRAST : MAX » COLOUR : CENTER » BRIGHTNESS : CENTER » TINT : CENTER » SHARPNESS : CENTER
8 WHITE TEMP 1. Receive "Monoscope Pattern" signal.
2. Set FUNCTION to select WHITE TEMP. 3. Press Volume Up/Down key to check WHITE
TEMP Option, STANDARD: NORMAL SETTING, WARM for more REDDISH direction changing, COOL for more BLUISH direction changing.
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