Electronics Forum => Electronic Video Blog => Topic started by: The Radio Shop on September 16, 2015, 05:16:26 PM
Title: Heathkit IG-1271 trouble shoot and repair video
Post by: The Radio Shop on September 16, 2015, 05:16:26 PM
In this video I use a 1.5 volt AA battery as a constant voltage source to track down a shorted capacitor.
Title: Re: Heathkit IG-1271 trouble shoot and repair video
Post by: The Radio Shop on September 16, 2015, 07:58:52 PM
A few pics
Title: Re: Heathkit IG-1271 trouble shoot and repair video
Post by: km4gig on December 31, 2016, 02:13:46 PM
Hey, Buddy,
I recently came across one of these myself and hooked it up to my scope. The square wave and triangle wave looks ok, but the sine wave is only rounded on the top side. The bottom is still a triangle. Looking at the partial manual that I have, it looks like D2-D7 make the top curve and D8-D13 make the bottom curve. What's the best way to go about troubleshooting this?
Title: Re: Heathkit IG-1271 trouble shoot and repair video
Post by: The Radio Shop on December 31, 2016, 04:01:22 PM
Yes check those diodes in that circuit for leakage. Also look to see if there are any tantalum capacitors there. As they can cause problems. I will try and pull the schematic later and have a look.
Title: Re: Heathkit IG-1271 trouble shoot and repair video
Post by: RJ on December 31, 2016, 09:48:19 PM
I would like to see how your using that 1.5 battery please.
Title: Re: Heathkit IG-1271 trouble shoot and repair video
Post by: km4gig on January 01, 2017, 02:13:06 AM
Well, I found that R25 and R28 (both 8.2k 1/4 watt) are reading .925K and 1.285k. Tomorrow I'll look and see if I have any 8.2k resistors in my stash and see if that has any effect.
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