Grundig CUC 7305, Service Manual

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1 - 2 GRUNDIG Service
Allgemeiner Teil / General Section CUC 7305
Es gelten die Vorschriften und Sicherheitshinweise
gemäß dem Service Manual "Sicherheit", Material-
nummer 72010 800 0000, sowie zusätzlich die even-
tuell abweichenden, landesspezifischen Vorschriften! The regulations and safety instructions shall be
valid as provided by the "Safety" Service Manual,
part number 72010 800 0000, as well as the
respective national deviations.
Table of Contents
Page
General Section .................................. 1-2…1-20
Test Equipment ............................................................................ 1-3
Type Label on the set (Version Number) ..................................... 1-3
Module List ................................................................................... 1-4
Technical Data ............................................................................. 1-4
Safety Advices / Service Notes .................................................... 1-5
Circuit Diagram Symbols ............................................................. 1-6
Operating Hints (P 37-830/12 text / Globetrotter) ...................... 1-14
Special and Service Functions ................................................... 1-20
Descriptions ....................................... 2-8…2-14
1. Power Supply ........................................................................... 2-8
1.1 12V Power Supply ....................................................... 2-8
1.2 Power Supply ............................................................... 2-9
2. System Control ...................................................................... 2-10
2.1 Microcomputer ........................................................... 2-10
2.2 Initialisation of the Processor after Switching On ....... 2-10
2.3 Switching over of the CCVS Signals to
the EURO-AV Socket ................................................ 2-10
2.4 Entering Commands .................................................. 2-10
2.5 Teletext IC850 (SDA5254) ......................................... 2-10
2.6 On Screen Display (OSD) .......................................... 2-10
2.7 Protection Circuit U
Schutz
.............................................. 2-10
3. TV Signal Processor TDA 8362 A .......................................... 2-11
3.1 Overview .................................................................... 2-11
3.2 IF ................................................................................ 2-11
3.3 CCVS-Signal .............................................................. 2-11
3.4 External CCVS Signal ................................................ 2-11
3.5 Sound IF ..................................................................... 2-12
3.6 Luminance and Chrominance Signal ......................... 2-12
3.7 SECAM Signal Path
and Automatic PAL/SECAM Switching ...................... 2-12
3.8 RGB Signal Path ........................................................ 2-13
3.9 Generation of the Horizontal and Vertical Sync Signals ... 2-13
3.10 Line Oscillator ............................................................ 2-13
3.11
ϕ
1-Phase Control ....................................................... 2-13
3.12
ϕ
2-Phase Control ....................................................... 2-13
3.13 The Super Sandcastle SSC ....................................... 2-14
3.14 Setting of the Cut-Off Voltage .................................... 2-14
3.15 HDR Output Stage ..................................................... 2-14
3.16 Field Deflection Stage ................................................ 2-14
3.17 Non-Interlace Compensation with Teletext ................ 2-14
3.18 Coincidence ............................................................... 2-14
Alignment ....................................................... 3-2
Layout of the PCBs
and Circuit Diagrams ......................... 4-1…4-26
Chassis Board .............................................................................. 4-1
Chassis Board (Enlarged) ............................................................ 4-7
General Circuit Diagram ............................................................ 4-11
CRT Panel 29305 022 8700 / 9000 ........................................... 4-17
12V Power Supply 29305 007 3100 .......................................... 4-19
12V Power Supply 29305 007 3300 .......................................... 4-23
Spare Parts Lists .................................. 5-1…5-8
Inhaltsverzeichnis
Seite
Allgemeiner Teil ................................. 1-2…1-19
Messgeräte .................................................................................. 1-3
Typenschild des Gerätes (Version Number) ................................ 1-3
Modulübersicht ............................................................................. 1-4
Technische Daten ........................................................................ 1-4
Sicherheits- / Service Hinweise ................................................... 1-5
Schaltplansymbole ....................................................................... 1-6
Bedienhinweise (P 37-830/12 text / Globetrotter) ...................... 1-10
Sonder- und Servicefunktionen .................................................. 1-19
Beschreibungen ...................................2-1…2-7
1. Netzteil ..................................................................................... 2-1
1.1 12V Netzteil .................................................................. 2-1
1.2 Netzteil ......................................................................... 2-2
2. Systemsteuerung ..................................................................... 2-3
2.1 Mikrocomputer ............................................................. 2-3
2.2 Initialisierung des Rechners nach dem Einschalten .... 2-3
2.3 FBAS-Umschaltung EURO-AV Buchse ....................... 2-3
2.4 Befehlseingabe ............................................................ 2-3
2.5 Videotext IC850 (SDA5254) ......................................... 2-3
2.6 OSD-Einblendung ........................................................ 2-3
2.7 Schutzschaltung U
Schutz
................................................. 2-3
3. TV-Signalprozessor TDA 8362 A ............................................. 2-4
3.1 Übersicht ...................................................................... 2-4
3.2 ZF ................................................................................. 2-4
3.3 FBAS-Signal ................................................................ 2-4
3.4 Externes FBAS-Signal ................................................. 2-4
3.5 Ton-ZF ......................................................................... 2-5
3.6 Luminanz- und Chrominanz-Signal .............................. 2-5
3.7 SECAM-Signalweg
und automatische PAL/SECAM-Umschaltung ............. 2-5
3.8 RGB-Signalweg ............................................................ 2-6
3.9 Gewinnung der H- und V-Synchronsignale .................. 2-6
3.10 Zeilenoszillator ............................................................. 2-6
3.11
ϕ
1-Regelung ................................................................ 2-6
3.12
ϕ
2-Regelung ................................................................ 2-6
3.13 Supersandcastle SSC .................................................. 2-7
3.14 Cut-Off-Einstellung ....................................................... 2-7
3.15 HDR-Endstufe .............................................................. 2-7
3.16 Vertikal-Ablenkung ....................................................... 2-7
3.17 Non-Interlace Kompensation bei Videotext .................. 2-7
3.18 Koinzidenz ................................................................... 2-7
Abgleich ......................................................... 3-1
Platinenabbildungen
und Schaltpläne ................................. 4-1…4-26
Chassisplatte ............................................................................... 4-1
Chassisplatte (vergrößert) ........................................................... 4-7
Gesamtschaltplan ...................................................................... 4-11
Bildrohrplatte 29305 022 8700 / 9000 ........................................ 4-17
12V Netzteil 29305 007 3100 ..................................................... 4-19
12V Netzteil 29305 007 3300 ..................................................... 4-23
Ersatzteillisten ...................................... 5-1…5-8