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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
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Very good detail, all pages clear, exactly what I needed
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Excellent service, and just what I needed to service my TU-7700. All pages of the manual are clear and easily readable.
CP-850FX Service Manual 5.10 POWER SUPPLY (STR-W6754) - Functions of Each Terminal 5.10.1 Vcc Terminal (Pin 4) 5.10.1.1 Start-up Circuit The start-up circuit detects Vcc terminal (No.4 pin) voltage, and makes a control IC start and stop. The power supply of the control IC (Vcc terminal input) employs a circuit as shown in Fig.1. At start-up, C3 is charged through a start-up resistor R2. The R2 value needs to be set more than the holding current of
R2
P
the latch circuit (150µA Max), which is described later, to be flown at the minimum AC input. 1 However, where the R2 value is too high, the current charging D2 D 4 to C3 shall be reduced after AC input. Consequently, it takes VC C much time to reach the operation start-up voltage, so it is C3 D S/ N 3 GD required to monitor the capacity of C3 that is mentioned later simultaneously. The Vcc terminal voltage falls immediately after the control circuit starts its operation; however the voltage STRW6700 drop is reduced by the increase of the C3 capacity. Therefore, Fig.1. Start-up Circuit even if the auxiliary drive winding voltage is delayed in rising, �1 起��路 the Vcc terminal voltage does not fall up to the operation stop voltage to maintain the start-up operation. However, with larger capacity of C3, it takes much time, after AC input, to reach the operation start since the certain time is required to charge C3. In general, SMPS performs its operation properly with the value, C3 is 10 to 47µF, R2 is 47k to 150k Ohm for 100V wide input, and 82K to 330K Ohm for 200V narrow input for its start up. As shown in Fig.2, the circuit current which makes the control circuit start is regulated at 100µA MAX (Vcc = 15V, Ta = 25C), and higher value resister R2 is applicable to the circuit. Once the Vcc terminal voltage reaches 18.2V (TYP), the control circuit starts its operation by the Start-up Circuit, and current consumption shall be increased. Once the Vcc terminal voltage falls and it becomes lower than the operation stop voltage 9.6V (TYP) with the decrease of the Vcc terminal voltage, Under Voltage Lock Out (UVLO) circuits stops the controlling operation and returns to the start-up mode.
C ＩC
100 μ A M ( AX ) 9 .6 V (TYP ) 1V 5 1 .V 82 ( TYP )
ＶC C
Fig.2. VCC Terminalé�» ï¼� è·¯ æµ� CC å�³ ï¼� VCC端 Vol. â�� Circuit Cur. Ｉ å�å�§å��é�» ICC
Europe R&D
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