|
|
|
Who's Online
There currently are 5841 guests online. |
|
Categories
|
|
Information
|
|
Featured Product
|
|
|
 |
|
|
There are currently no product reviews.
 ;
very good quality readable manual,printed off very well.
;
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.
 ;
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.
;
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.
;
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 constructed 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. S Curve Check
oscilloscope BD board
Note: Clear RF signal waveform means that the shape ��� can be clearly distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV : 200mV TIME/DIV : 500ns level : 1.45 ± 0.25 Vp-p
E-F Balance (1 Track Jump) check
oscilloscope BD board TP (FE) TP (VC) + � TP (TE) TP (VC) + �
Procedure : 1. Connect the oscilloscope to test points TP (FE) and TP (VC). 2. Connect TP (FEI) and GND, and TP (AGCCON) and GND of the BD board with lead wires. 3. Press the 1/u button to turn the set ON. 4. With the disc (YEDS-18) loaded, press the ·P button and perform focus search. (Focus search will be performed in the same way even while the disc table is pushed in and out.) 5. Check the symmetry and peak to peak level of the oscilloscope waveform (S curve) at this time.
S-curve waveform
symmetry
Procedure: 1. Connect oscilloscope to test point TP (TE) on BD board. 2. Press the 1/u button to turn the unit ON. 3. Put disc (YEDS-18) in to play the number five track. 4. Press the ·P button. 5. Check the level B of the oscilloscope's waveform and the A (DC voltage) of the center of the Traverse waveform. Confirm the following: � A/B x 100 = less then ± 22 (%) � B = 1.3 ± 0.6 Vp-p
1 track jump waveform
Center of the waveform
A Within 4 ± 1 Vp-p B
B A (DC voitage)
0V
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
oscilloscope BD board TP (RF) TP (VC) + � TP (VC)
Symmetry level : 1.3 ± 0.6 Vp-p
Adjustment Location : [ BD BOARD ] � SIDE A �
Procedure : 1. 2. 3. 4. 5. 6. Connect oscilloscope to test point TP (RF) and TP (VC) on BD board. Connect TP (AGCCON) and GND of the BD board with lead wires. Press the 1/u button to turn the set ON. Put disc (YEDS-18) in and playback 5 track. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not. After check, remove the lead wire connected in step 2.
TP (RF)
TP (AGCCON) TP (FE) TP (TE) TP (FE1)
� 18 �
|
|
|
> |
|
