08-10-2021, 09:08 AM
Hi Crackle, thanks for your reply.
I checked the resistance between the pins as you pointed out.
IFT3 leg 1 - IFT3 leg 3 reads 9 Ohm
IFT3 leg 4 - IFT3 leg 6 reads 1.4 Ohm
I checked the diode in the Diode mode on the multimeter by putting the positive lead on the Leg 6, which should be an anode and negative lead on Leg 5 which should be a cathode. The reading was 2.3V. I swapped the leads around and the reading was again around 2.2V.
I also measured the resistance between 6-5 and vice versa and it was 5 kOhm both ways. I expected that from the 5-6 (cathode to anode) it would read OL but it didn't.
Is my methodology correct and is this enough to conclude that the diode is not working?
The diode marked CD1 on my service sheet (the snippet of schematic is 3 posts above) is OA70, curiously enough listed as a video detector diode on a spec sheet I found online. I am attaching the datasheet I found. I would ideally get something modern to replace this, will any germanium diode do or should I go for new old stock from eBay?
Best regards,
TinaRotator
I checked the resistance between the pins as you pointed out.
IFT3 leg 1 - IFT3 leg 3 reads 9 Ohm
IFT3 leg 4 - IFT3 leg 6 reads 1.4 Ohm
I checked the diode in the Diode mode on the multimeter by putting the positive lead on the Leg 6, which should be an anode and negative lead on Leg 5 which should be a cathode. The reading was 2.3V. I swapped the leads around and the reading was again around 2.2V.
I also measured the resistance between 6-5 and vice versa and it was 5 kOhm both ways. I expected that from the 5-6 (cathode to anode) it would read OL but it didn't.
Is my methodology correct and is this enough to conclude that the diode is not working?
The diode marked CD1 on my service sheet (the snippet of schematic is 3 posts above) is OA70, curiously enough listed as a video detector diode on a spec sheet I found online. I am attaching the datasheet I found. I would ideally get something modern to replace this, will any germanium diode do or should I go for new old stock from eBay?
Best regards,
TinaRotator
