Introduction and Safety Information
This service manual provides comprehensive information for the maintenance and repair of Grundig CUC 2030 N to 2080 N series televisions. It covers various models including ST, Greenville, Melbourne, and MW series.
All regulations and safety instructions as provided by the "Safety" Service Manual (Part Number 72010 800 0000) are valid, in addition to any national deviations.
Important Note: The CUC 20xx chassis are fitted with either TDA 8843/8375 or TDA 8843-N2/8844-N2. The TDA 8843-N2/8844-N2 type includes an integrated PLL demodulator, eliminating the need for AFC adjustment in the Service Menu.
Attention:
- After any repair or replacement of NVM (IC82005), verify if the NTSC 3.58MHz quartz is fitted. If not, set the "NTSC 3.6" dialog line in the Service Menu to "off". To do this: Press "i" → "OK" → "SERVICE" → "OK" → Service Code "8500" → "NTSC 3.6" "off", then save the setting "with mem." via the "End" dialog line.
- If no SAT Receiver (SNR 105 microSAT) is connected to the AV1 socket, set "SAT" in the Service Menu to "off". To do this: Press "i" → "OK" → "SERVICE" → "OK", select the "SAT" dialog line and switch to "off".
All adjustment controls not explicitly mentioned in this manual are factory pre-set and should not be re-adjusted during service.
1. Chassis Board Alignment
Measuring Instruments: Dual-channel oscilloscope, 10:1 test probe, digital voltmeter, color video generator, spectrum analyzer or RF millivoltmeter.
Service work after replacement or repair of the following modules:
- Power supply: alignment 1.1
- Tuner: alignment 1.2, 1.3/1.4
- NVM IC82005: alignment 1.2...1.8, 2.1, 2.2, 3.1, 3.3
- Horizontal deflection: alignment 1.9
Alignment Procedures
| Alignment | Preparations | Alignment Process |
|---|---|---|
| 1.1 +A voltage | Check and re-adjust if necessary after every repair and before every alignment. Brightness: Minimum. Digital voltmeter: Cathode D61016. | Adjust R60037 or R61313 according to the power supply circuit diagram (page 16). |
| 1.2 Tuner AGC | Spectrum analyzer 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 "i" (DIALOG CENTER) → "OK" → "SERVICE" → "OK" → Service Code "8500". | Adjust 102dBµV (360mVpp) with button "-" or "+". Alternatively, without using a spectrum analyzer or RF millivoltmeter, adjust the picture with button "-" or "+" so that noise just appears on the screen. Then reset until the picture is again free of noise. Terminate "with mem." via the "End" dialog line. |
| 1.3 AFC Reference (only VST Tuner) | Feed in a generator test pattern with vision carrier 38.9MHz, approx. 120mV to tuner contact 10, 11. Call up the dialog line "AFC" via "i" (DIALOG CENTER) → "OK" → "SERVICE" → "OK" → Service Code "8500". | Activate the setting with "OK". Internal adjustment of the PLL demodulator is carried out. If an arrow is displayed beside the text after adjustment, re-adjust the AFC with demodulator filter F33025 until the arrows disappear. The arrow on the left or right of the AFC value in the menu indicates the sense of rotation for adjusting the filter. Arrow on the right: core of the filter turned in too far. Arrow on the left: core of the filter turned out too far. Repeat this adjustment with "OK". Terminate "with mem." via the "End" dialog line. |
| 1.4 AFC Reference (only PLL-Tuner) | Feed in a standard test pattern with standardized channel spacing, band 1 (channel 2...4) without finetuning. Call up the dialog line "AFC" via "i" (DIALOG CENTER) → "OK" → "SERVICE" → "OK" → Service Code "8500". | Activate the setting with "OK". Internal adjustment of the PLL demodulator is carried out. If an arrow is displayed beside the text after adjustment, re-adjust the AFC with demodulator filter F33025 until the arrows disappear. The arrow on the left or right of the AFC value in the menu indicates the sense of rotation for adjusting the filter. Arrow on the right: core of the filter turned in too far. Arrow on the left: core of the filter turned out too far. Repeat this adjustment with "OK". Terminate "with mem." via the "End" dialog line. |
| 1.5 OSD | Call up the dialog line "OSD" via "i" (DIALOG CENTER) → "OK" → "SERVICE" → "OK" → Service Code "8500". | Position the menu in the middle of the picture with button "-" or "+". Terminate "with mem." via the "End" dialog line. |
| 1.6 Tube (Type of picture tube) | Call up the dialog line "Tube" via "i" (DIALOG CENTER) → "OK" → "SERVICE" → "OK" → Service Code "8500". | Enter the correct screen diagonal with button "-" or "+". Terminate "with mem." via the "End" dialog line. |
| 1.7 Overscan | Only with IC TDA8843 or TDA8844 as well as with Philips 72cm/84cm in 4:3 and 70cm/82cm in 16:9 format picture tubes. Call up the dialog line "Overscan" via "i" (DIALOG CENTER) → "OK" → "SERVICE" → "OK" → Service Code "8500". | Set to "off" with button "-" or "+". Terminate "with mem." via the "End" dialog line. |
| 1.8 NTSC 3.6 | Call up the dialog line "NTSC 3.6" via "i" (DIALOG CENTER) → "OK" → "SERVICE" → "OK" → Service Code "8500". | Set to "off" or "on" with button "-" or "+" depending on the type of television receiver. Terminate "with mem." via the "End" dialog line. |
| 1.9 Line Sharpness (only TV's with Focus Block) | Feed in a convergency test pattern. Set the 16:9 picture format (with 16:9 TV sets). Contrast (○) to maximum. Set the screen brightness (✪) so that the black background of the test pattern just starts to brighten. | With focus control Focus 1, adjust the horizontal lines in the middle of the screen to minimum vertical width. Subsequently, with focus control Focus 2, adjust the vertical lines approx. 5cm from the right and left picture edge to minimum horizontal width. |
| Line Sharpness (only TV's without Focus Block) | Feed in a convergency test pattern. Set the 16:9 picture format (with 16:9 TV sets). Contrast (○) to maximum. Set the screen brightness (✪) so that the black background of the test pattern just starts to brighten. | With focus control, adjust the vertical lines approx. 5cm from the right and left picture edge to minimum horizontal width. The sharpness in the middle must not seem to be worse than the sharpness at the edges. If necessary, take an average. |
2. Picture Geometry
Measuring Instruments: Color video generator, dual-channel oscilloscope with 10:1 test probe.
Service works after replacement or repair:
- Start with the vertical slope when adjusting the geometry!
- Horizontal and vertical deflection and replacement of the picture tube: alignment 2.1, 2.2
- Bridge coil L53074: Only necessary after unskillful manipulation of the horizontal deflection: alignment 2.3
- NVM IC82005: alignment 1.2...1.8, 2.1, 2.2, 3.1, 3.3
| Alignment | Preparations | Alignment Process |
|---|---|---|
| 2.1 Vertical Slope | Call up the "Vertical Slope" menu via "i" (DIALOG CENTER) → "OK" → "SERVICE" → "OK" → Service Code "8500" → "GEOMETRY". | Adjust the center line of the test pattern in the dialog line "Vertical Slope" (typ. 30...33) with button "-" or "+" so that it is just still visible. Press button "i" twice (GEOMETRY → SERVICE) and terminate the dialog line "End" with "with mem.". The picture geometry is adjusted to the value last stored whenever the TV set is switched on. |
| 2.2 Horizontal Shift | Max. brightness. Call up dialog line "Horizontal Width" via "i" (DIALOG CENTER) → "OK" → "SERVICE" → "OK" → Service Code "8500" → "GEOMETRY" → "OK" and reduce the width of the picture using button "-" or "+". Call up dialog line "Horizontal Shift". | Position the picture content in the middle of the raster using button"-" or "+". Re-adjust the horizontal width according to the test pattern. With connector "ST-Shift" on the chassis (option), position the test pattern in the middle of the screen. Dependent on the scanning spread of the picture tube this connector may be retrofitted, connected the other way round, or the rating of the resistor may be changed. Press button "i" twice (GEOMETRY → SERVICE) and terminate the dialog line "End" with "with mem.". The picture geometry is adjusted to the value last stored whenever the TV set is switched on. |
| 2.3 Bridge Coil L53074 | Bridge coil L53074 is adjusted in the factory and this setting must not be changed. Call up dialog line "Horizontal Width" via "i" (DIALOG CENTER) → "OK" → "SERVICE" → "OK" → Service Code "8500" → "GEOMETRY" → "OK". Set Horizontal Width to minimum. Oscilloscope channel 1: collector T53001. Oscilloscope channel 2: cathode D53072. | Check the oscillograms for the same pulse width and re-adjust it if necessary with coil L53074. Adjust the horizontal width according to the test pattern. |
3. CRT Panel Alignment
Measuring Instruments: High-resistance voltmeter, dual-channel oscilloscope with 10:1 test probe.
Service works after replacement or repair:
- CRT, CRT panel: alignment 3.1...3.3
- NVM IC82005: alignment 1.2...1.8, 2.1, 2.2, 3.1, 3.3
| Alignment | Preparations | Alignment Process |
|---|---|---|
| 3.1 White Balance | Feed in a grey scale black/white test pattern with burst. Contrast (○) to maximum. Color contrast (✪) to mid-position. Screen brightness (○) to mid-position. Call up dialog line "WHITE ADJUSTMENT" via "i" (DIALOG CENTER) → "OK" → "SERVICE" → "OK" → Service Code "8500". | Set the values for "Green" or "Blue" with button "-" or "+" so that the picture becomes achromatic. Check the white balance at minimum contrast and maximum contrast. Terminate "with mem." via the "End" dialog line. |
| 3.2 Screen Grid Voltage UG2 (with TDA8375) | TV set in AV position. Feed in a black raster. Screen brightness: Grey raster just becoming dark. Connect the voltmeter via 220kΩ to test points R, G and B. Determine the point with the highest voltage level. Voltmeter (220kΩ) or oscilloscope to test point with highest voltage level. | Set the voltmeter to read 162.5V±2.5V with adjustment control UG2 on the picture tube panel. Or adjust the oscilloscope as shown by a waveform with a black level and a peak at 162.5V±2.5V. |
| 3.3 Screen Grid Voltage UG2 (with TDA8843 or TDA8844) | Call up dialog line "Cut-off align" via "i" (DIALOG CENTER) → "OK" → "SERVICE" → "OK" → Service Code "8500". Confirm with "OK". | With adjustment control UG2 on the picture tube panel (or Focus Block), adjust the line appearing first – red, green, blue or mixed-color – so that it is just well visible. Return to the menu with "OK". |
Module List and Technical Data
This section provides a comprehensive list of modules and their corresponding part numbers, along with detailed technical specifications for various Grundig TV models covered by this manual.
Module List (Excerpt)
| Module | Module Part Number | Service Manual CUC 2030/2031 N | 1st Supplement CUC 2030/2031 N | 3rd Supplement CUC 2030/2040 N India | 4th Supplement CUC 2030 N - 2080 N |
|---|---|---|---|---|---|
| Dyn. Focus | 29305-025.35 | 72010-020.70 | 72010-020.71 | 72010 020 7300 | Page 57 |
| Mains Switch Panel | 29305-165.71 | Page 3 - 27 | |||
| 29305-165.73 | Page 3 - 28 | ||||
| 29305-165.76 | Page 13 | ||||
| Dolby Surround Board (DPL Module 2) | 29504-104.75 | Page 13 | |||
| 29504-104.77 | Page 43 | ||||
| AF Amplifier | 29524-104.78 | Page 13 | |||
| Feature Board CTI/LTI | 29305-119.35 | Page 40 | |||
| Control Unit | 29501-082.59 | Page 3 - 33 | |||
| 29501-082.61 | Page 3 - 33 | ||||
| 29501-082.62 | Page 22 | ||||
| 29501-082.66 | Page 24 | ||||
| 29501-082.69 | Page 29 | ||||
| 29501-082.70 | Page 46 | ||||
| 29501-082.72 | Page 27 | ||||
| 29501-082.73 | Page 59 | ||||
| Keyboard | 29501-083.16 | Page 59 | |||
| 29501-083.25 | Page 3 - 32 | ||||
| 29501-083.44 | Page 3 - 32 | ||||
| 29501-083.70 | Page 46 | ||||
| BSO Panel | 29305-119.44 | Page 3 - 24 | |||
| Processor Panel | 29305-119.37 | Page 3 - 25 | Page 26 | ||
| 29305-119.39 | Page 3 - 25 | ||||
| 29305-119.40 | Page 3 - 25 | Page 26 | Page 49 | ||
| 29305-119.46 | Page 3 - 25 | Page 26 | |||
| 29305-119.71 | Page 49 | ||||
| 29305-119.75 | Page 26 | ||||
| Alternative Board | 29305-119.42 | Page 3 - 31 | |||
| 29305-119.45 | Page 3 - 31 | ||||
| Socket Board | 29305-008.34 | Page 3 - 29 | |||
| 29305-008.35 | Page 3 - 30 | ||||
| 29305-008.37 | Page 3 - 30 | ||||
| 29305-008.38 | Page 3 - 29 | Page 39 | |||
| 29305-008.39 | Page 27 | ||||
| 29305-160.53 | Page 26 | ||||
| CRT Panel | 29305-122.16 | Page 3 - 11 | |||
| 29305-122.18 | Page 3 - 11 | ||||
| 29305-122.21/.23 | Page 35 | ||||
| 29305-122.22 | Page 37 | ||||
| UG2-Shift | 29305-119.43 | Page 48 | |||
| Panorama View | 29305-119.68 | Page 48 | |||
| PIP Module | 29504-106.52 | Page 52 | |||
| 29504-106.51 | Page 52 |
Technical Data (Excerpt for ST 63-705 NIC/TEXT)
| Category | Specification | ST 63-705 NIC/TEXT (CUC 2030 N) |
|---|---|---|
| Picture Tube | Visible picture | 59cm |
| Screen diagonal | 63cm (25") Black Line D | |
| Deflection angle | 110° | |
| Vertical frequency | 50Hz | |
| Electronic | Programme positions | 79 TV + 3 AV |
| AV evaluation | programmable for every programme position | |
| Tuner | Tuner type | VST-Voltage synthesizer tuning UHF/VHF |
| TV-Standard | PAL, NTSC 4.43MHz, B/G, I, D/K,K' (only PAL) | |
| Stereo systems | German A2 for B/G/D/K, Nicam 5.85+6.52MHz | |
| Teletext | Teletext pages | 1 page text |
| Audio | Music power (without Dolby) | Stereo 2 X 8W |
| Music power (with Dolby Prologic) | — | |
| Front Connections | Headphones | Stereo 3.5mm jacksocket, adjustable volume, individual channel selection with dual-sound broadcasts |
| Video IN | 1 x Cinch | |
| Audio IN | 2 x Cinch | |
| Rear Connections | Euro AV 1 (black) | FBAS in-/output, SBAS input, RGB input, MicroSat remote control (Pin 8) |
| Euro AV 2 (black) | FBAS in-/output, SBAS input, RGB input | |
| Mains Stage | Mains voltage (variable) | 165...265V |
| Mains frequency | 50/60Hz | |
| Power consumption | approx. 70W | |
| Standby | approx. 5W |
*Note: The full technical data section in the original document provides specifications for all listed models across multiple pages.
Circuit Diagrams and PCB Layouts
This manual includes detailed circuit diagrams and PCB layouts for various modules within the Grundig TV chassis. These diagrams are essential for understanding the internal structure and troubleshooting electronic components.
Key diagrams include:
- Mains Switch Board (29305-165.76) - Component Side and Solder Side views, along with its circuit diagram.
- Mains Chassis - Detailed circuit diagram and component list.
- Signal Chassis A and B - Comprehensive circuit diagrams and layouts.
- CRT Panel (29305-122.21/.23 and 29305-122.22) - Component and Solder Side views, with associated circuit diagrams.
- Socket Board (29305-008.38) - Component and Solder Side views, with circuit diagram.
- Feature Board CTI/LTI (29305-119.35) - Component and Solder Side views, with circuit diagram.
- Dolby Surround Board (29504-104.77) - Component and Solder Side views, with circuit diagram.
- Control Unit (29501-082.70) and Keyboard (29501-083.70) - Layouts and circuit diagrams.
- UG2 Shift/Panorama View (29305-119.43/.68) - Circuit diagram and layouts.
- Processor Board (29305-119.40/.71) - Layouts and circuit diagrams.
- PIP Module (29504-106.51/.52) - Layouts and circuit diagrams.
- Dyn. Focus (29305-025.35) - Circuit diagram and layouts.
Oscillograms are also provided for various test points on the chassis, illustrating expected waveforms for proper operation and troubleshooting.
Spare Parts List
This section details replacement parts for the Grundig CUC 2030 N - 2080 N series televisions. Each entry includes the position number, part number, quantity, and a description in English.
Example Spare Parts (Excerpt)
| Pos. No. | Part Number | Description |
|---|---|---|
| 0200 000 | 29625 735 0200 | CABINET FRONT PART ST63-705NIC/TEXT BLACK |
| 0252 000 | 29303 390 4200 | HEADPHONE SOCKET 3.5 W/O SWITCH |
| 0255 000 | 29501 652 0100 | COVER SOCKETS |
| 0300 000 | 29631 947 8000 | REAR PANEL ST63-705NIC/TEXT |
| 1100 000 | 83000 204 0100 | PICT.TUBE A59EAK71X01/A59EAK071X01 PHI ST63-705NIC/TEXT |
| 1360 000 | 29703 291 3200 | POWER SWITCH 4A |
| 1900 000 | 29305 165 7600 | POWER SWITCH BOARD |
| 2400 000 | 29642 062 1100 | REMOTE CONTROL TP 715 |
*Note: The full spare parts list in the original document spans multiple pages and includes detailed component-level parts.
General Information and Test Equipment
For further information regarding test and measuring equipment, please refer to the Grundig Catalog "Test and Measuring Equipment". This catalog can be obtained from:
Grundig InstrumentsTest- und Meßsysteme GmbH
Würzburger Str. 150
D-90766 Fürth/Bay.
Tel. +49 911/703-4118
Telefax +49 911/703-4130
Email: instruments@grundig.de
Website: http://www.grundig-instruments.de
