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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.
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Perfect like it was descriped, Perfect like it was descriped
4) DTMF Encoder Circuit (option) The DTMF signal corresponding to the combination of the column and row is output from tone output pin17 of IC401 Encoder, producing a frequencymodulated RF output. The Q401 switches the DTMF Encoder when lC401 is active during DTMF transmission.
5) Tone Squelch Circuit (option) 1.Decoder The second IF signalfrom pin11 of IC1, and input to the tone squelch decoder lC701. When the tone squelch decoder IC701 decodes the input tone signal frequency as the programmed frequency, pin13 goes to "Low". The signal is input to pin16(DET) of lC107, and the squelch goes off. When the Tone squelch decoder IC701 does not decode the input tone signal frequency as the programmed frequency, pin13 goes to "High". 2. Encoder The tone signal is output from pin16 of IC701, producing a frequencymodulated RF output. 6) Microprocessor (CPU) and Peripheral Circuit Refer to "Terminal Function of Microprocessor" about each terminal function. 1, BS Mode When the Squelch is closed for more than 5 seconds, the radio goes into the BS(Battery Save) mode automatically. Pin11 (R5C) and pin19 become High or Low periodically. Open the Squelch, and the radio does not go into the BS mode.
2. Backup Reset When the voltage detector circuit lC303 detects a decrease in the C5V line, CPU RAM data is stored in the EEPROM IC, IC601. IC 302 is also the voltage detector circuit and it detects the lower voltage than IC303. The circuit detects a increase in the C5V line when power is turned on, and then the CPU will be initialized. 3. Reset Press and holdthe."F" key, then turn on the power. The radio will reset to initial factory settings. Even if you expanded the frequency, it will return to the initial setting. To resume the expanded frequency, press and hold the "F" and "Lamp" keys, then turn on the power. Page 6
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