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GRUNDIG ST70788
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English, German
Price: $4.99

Description of GRUNDIG ST70788 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English, German

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Text excerpt from page 5 (click to view)
CUC 2030 / 2030 N / 2040 N / 2040 India

Abgleich / Alignment

D Abgleich
1. Chassisplatte
Meßgeräte: Tastkopf 10:1, Farbbildgenerator, Spektrumanalyser oder HF-Millivoltmeter Servicearbeiten nach Austausch bzw. Reparatur: - Tuner: Abgl. 1.3

Abgleich 1.3 Tuner-AGC

Vorbereitung Spektrumanalyser oder HF-Millivoltmeter symmetrisch an Tunerkontakt 10, 11. Senderbild oder Generator über die Antenne einspeisen, 70…80dBµV.

Abgleichvorgang

Mit den Tasten "z -" oder "+ g" 102dBµV (360mVss) einstellen. Ersatzweise wird ohne Spektrumanalyser oder HF-Millivoltmeter mit den Tasten "z -" oder "+ g" das Bild so abgestimmt, daß es gerade zu rauschen beginnt. Dann Dialogzeile "AGC" über " " (DIALOG CENTER) –> "OK" soweit zurückstellen, bis das Bild wieder rauschfrei wird. –> SERVICE –> "OK" –> Service Code "8500" –> aufrufen. Dialogzeile "End" mit "with mem" beenden.

Hinweis:
Es werden in den Chassis CUC 20xx TDA 8843/8375 bzw. TDA 8843-N2/8844-N2 eingebaut. Bei dem Typ TDA 8843-N2/8844-N2 ist ein PLLDemodulator integriert und somit entfällt der AFC-Abgleich im Service Menü. Achtung! Nach einer Reparatur bzw. Wechsel des NVM (IC82005) muß kontrolliert werden, ob der NTSC Quarz 3,58MHz bestückt ist. Bei nicht bestücktem Quarz, muß über das Service Menü der Menüpunkt "NTSC 3,6" auf "aus" gestellt werden. –> OK –> SERVICE –> OK –> Service Code "8500" –> NTSC 3,6 "aus" und das Menü mit "with mem" verlassen

GB

Alignment

1. Chassis Board
Measuring instruments: 10:1 test probe, colour video generator, spectrum analyser or RF millivoltmeter. Service works after replacement or repair of the following modules: - Tuner: alignment 1.3

Alignment 1.3 Tuner AGC

Preparations Spectrum analyser or RF millivoltmeter symmetrical to tuner contact 10, 11. Feed in a standard test pattern or generator via the aerial, 70…80dBµV. Call up the dialog line "AGC" via " " (DIALOG CENTER) –> "OK" –> SERVICE –> "OK" –> Service Code "8500".

Alignment Process Adjust 102dBµV (360mVpp) with button "z -" or "+ g". Alternatively, without using a spectrum analyser or RF millivoltmeter, adjust the picture with button "z -" or "+ g" so that noise just appears on the screen. Then reset until the picture is again free of noise. Dialog line "End", terminate "with mem".

Note:
The CUC 20xx chassis is fitted with TDA 8843/8375 or TDA 8843-N2/8844-N2. Type TDA 8843-N2/8844-N2 has an integrated PLL demodulator so that the AFC needs not to be adjusted via the Service Menu. Attention! After repair or replacement of the NVM (IC82005) it is to be checked whether the NTSC 3.58MHz quartz is fitted. If this quartz is not inserted the menu option "NTSC 3.6" in the Service Menu must be set to "off". –> OK –> SERVICE –> OK –> Service Code "8500" –> NTSC 3.6 "off" and leave the menu with "with mem".

GRUNDIG Service

5

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