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- SERVICING NOTE
- GENERAL
- DISASSEMBLY
- Loading Panel
- Front Panel
- TC Mechanism Deck
- CD SW Board, Panel Board
- Disc Tray
- MECHANICAL ADJUSTMENTS
- ELECTRICAL ADJUSTMENTS
- DIAGRAMS
- Circuit Boards Location
- Block Diagrams
- Tuner Section
- Deck Section
- CD Section
- Main Section
- Printed Wiring Board —Tuner Section
- Schematic Diagram — Tuner Section
- Printed Wiring Board — Main Section
- Schematic Diagram — Main Section
- Schematic Diagram — Deck Section
- Printed Wiring Board — CD Motor Section
- Schematic Diagram — CD Motor Section
- Schematic Diagram — CD Section
- Printed Wiring Board — CD Section
- Printed Wiring Board — Panel Section
- Schematic Diagram — Panel Section
- IC Pin Functions
- IC Block Diagrams
- EXPLODED VIEWS
- Case Section
- Front Panel Section 1
- Front Panel Section 2
- Back Panel Section
- CD Mechanism Section 1 (CDM38 - 5BD19)
- CD Mechanism Section 2 (CDM38 - 5BD19)
- Base Unit Section (BU - 5BD19)
- TC Mechanism Section 1 (TCM - YSW47C24)
- TC Mechanism Section 2 (TCM - YSW47C24)
- TC Mechanism Section 3 (TCM - YSW47C24)
- ELECTRICAL PARTS LIST
There are currently no product reviews.
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very good quality readable manual,printed off very well.
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The manual was very accurate for the part that I was changing, I was able to order the correct part and had no issues with the replacement procedure. However, I was expecting to have more detailed repairs for the lower drive unit.
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I needed the manual immediately and I got it immediately. I couldn't find this manual anywhere else on the net. The site was easy to traverse, and the price was very reasonable. I'll definitely be back for any future needs.
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I received a good service manual, with good resolution. Improve the instructions for the purchase because they are not well understood.
For the rest, so good.
Thanks Angel.
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Very good documentation for the Grundig 2077 model (as well as similar 800/900/1000 series radios). The first two pages are a summary of reception specifications and output capability. The third page is the tuner dial indicator and dial cord routing diagram. the final ~5 pages are the schematics for the various models (including 2077). The scan quality of the schematics are good, adn can be easily read if zoomed in. The documents are in German, not English as stated. It would have been nice to have the tuning sequence and settings, and some trouble shooting materials... or component and wiring map.
CD SECTION
Note: 1. CD Block is basically designed to operate without adjustment. Therefore, check each item in order given. 2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. 3. Use an oscilloscope with more than 10M� impedance. 4. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks. 5. Adjust the focus bias adjustment when optical block is replaced. Focus Bias Adjustment
oscilloscope BD board TP (RF) TP (VC)
S Curve Check
oscilloscope BD board TP (FEO) TP (VC)
Procedure : 1. Connect oscilloscope to test point TP (FEO). 2. Connect between test point TP (FOK) and Ground by lead wire. 3. Turn Power switch on. 4. Put disc (YEDS-18) in and turned Power switch on again and actuate the focus search. (actuate the focus search when disc table is moving in and out.) 5. Check the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 2.4 ± 0.7 Vp-p. S-curve waveform
Procedure: 1. Connect oscilloscope to test point TP (RF). 2. Turned Power switch on. 3. Put disc (YEDS-18) in and playback. 4. Adjust RV101 so that the waveform is clear. (Clear RF signal waveform means that the shape ��� can be clearly distinguished at the center of the waveform.) 5. After adjustment, check the RF signal level. � RF signal VOLT/DIV: 200 mV TIME/DIV: 500 nS
symmetry
A within 2.4 ± 0.7 Vp-p B
6. After check, remove the lead wire connected in step 2. Note: � Try to measure several times to make sure than the ratio of A : B or B : A is more than 10 : 7. � Take sweep time as long as possible and light up the brightness to obtain best waveform. RF Level Check
level: 1.3 ± 0.3 Vp-p oscilloscope BD board TP (RF) TP (VC)
Procedure : 1. Connect oscilloscope to test point TP (RF) on BD board. 2. Turned Power switch on. 3. Put disc (YEDS-18) in and playback. 4. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not. Note: Clear RF signal waveform means that the shape ��� can be clearly distinguished at the center of the waveform. RF signal waveform
VOLT/DIV: 200 mV TIME/DIV: 500 nS
level: 1.3 ± 0.3 Vp-p
� 14 �
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