Suchergebnisse

Zitat von oldiefan: „Hello xiao0507, it is similar to the fault already described here: Saba 9241 fm-rnitte Indicate questions 1. attach DC millivoltmeter between measurement points B5 and B6, switch AFC off 2. adjust exactly to a fm-station so that signal strength is precisely at its maximum 3. adjust P324 in the fm-if box so that the DC millivoltmeter between measurement points B5 and B6 is at 0 (+/- 5) mV. 4. adjust P417 for center indication (zero) at the fm tuning instrument The fm-tuning i…

Hello everyone I'm here to bother you again. When I turn off the machine, the FM meter reads fine. After turning it on, I tuned it. The pointer only swings in the red triangle area and does not swing to the left. When the correct signal is adjusted, it only indicates the green position. It seems that the indicated frequency is not very accurate. Please give me some advice. Some repair suggestions, thank you very much! pFQkQn1.jpg

Zitat von oldiefan: „It looks that there is some readjustment required in the fm-if box. 1) Remove the two screws (at the rf-main board solder side) holding the fm-if box (FM-ZF-Modul). Then, pull out the fm-if-box and plug it onto the back side of the rf-main board onto the corresponding pin row. Watch out that you put it in the right direction (same direction as on the parts-side), that is pin 1 of the box must match pin 1 of the pins on the board. 2) Attach a DC-voltmeter between measurement …

Zitat von oldiefan: „Hello again! Adjustment: Tune to a transmitter precisely, so that the field strength indicator meter (Abstimmung) is exactly at its maximum. Then adjust potentiometer P2022 so that the fm-mitte indicator pointer is in the center. saba-forum.dl2jas.com/index.ph…21079f34392bec4f8298c4d39 Best Regards Reinhard“ Hello old friend! Thanks Reply! After adjusting according to the method you mentioned, rotate P2022 to the right to the position where it cannot move. When the pointer m…

Hello everyone! I'm here to bother you again. When my machine is turned off, the FM meter indicates normal. After turning on the machine, I tune it. The pointer only swings in the red triangle area and does not swing to the left. It seems that the indicated frequency is not very accurate. Please give me some advice. Some suggestions for repairs, thank you very much! pFE71zV.png

Zitat von oldiefan: „Zitat von xiao0507: „ I have replaced the SN7402 and the problem remains the same. I tested the new SN7402 and the old MC10116, and as you said, the signals are all normal. If any of pins 8, 9, and 12 of SN7402 is high, pin 13 should be high. Are…“ Thank you very much for your reply! I replaced the AY-5-8100 and the machine is working normally and the display is completely normal. Again, thank you!

Zitat von oldiefan: „The wrong voltage at pin 27 might indicate that either AY-5-8100 or SN7402 (or both in worst case) could be defective. Normally, the current (about 4.7 mA) through R3043 (820 Ohm) causes a voltage drop of 3.9 V (from 5 V to 1.1 V) across this resistor. However, if there is too little or no current through R3043 then there will be little or no voltage drop and you measure in that case 5 V supply voltage at pin 27 of AY-5-8100, which is also connected with pin 13 of SN7402. I …

Zitat von oldiefan: „Hello friend, please find attached the schematics for the counter. In a first step you shall confirm a) that you find at the fm- and am inputs of the counter box the corresponding mixer frequency, respectively b) that you find the correct voltages of +5 V and -12 V behind the voltage stabilizer ICs LM320K and LM309K The electrolytic caps C3102 C3103 C3107 C3112 C3044 shall be replaced. The swords which are connecting both boards in the counter must all be present and shall f…

Hallo zusammen. Ich bin ein Freund aus China. Ich habe eine Saba 9241 digital. Nach dem Test kann das Gerät normal in AM und FM funktionieren, aber AM zeigt 000 und FM zeigt 00,0 an. Bitte sehen Sie sich das Bild an, das ich gesendet habe, +9V und -17V Spannung. Das ist normal. Ich öffnete die Verpackung der Anzeigekomponente und stellte fest, dass der AO 808-Pin gesprungen zu sein schien, bin mir aber nicht sicher, ob das etwas damit zu tun hat. Aufgrund fehlender Informationen weiß ich nicht, …