Author Topic: Heathkit IG-1271 trouble shoot and repair video  (Read 8677 times)

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Offline The Radio Shop

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Heathkit IG-1271 trouble shoot and repair video
« 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.



Buddy kc4umo

Offline The Radio Shop

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Re: Heathkit IG-1271 trouble shoot and repair video
« Reply #1 on: September 16, 2015, 07:58:52 PM »
A few pics
Buddy kc4umo

Offline km4gig

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Re: Heathkit IG-1271 trouble shoot and repair video
« Reply #2 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?

Offline The Radio Shop

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Re: Heathkit IG-1271 trouble shoot and repair video
« Reply #3 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.
Buddy kc4umo

Offline RJ

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Re: Heathkit IG-1271 trouble shoot and repair video
« Reply #4 on: December 31, 2016, 09:48:19 PM »
I would like to see how your using that 1.5 battery please.

Offline km4gig

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Re: Heathkit IG-1271 trouble shoot and repair video
« Reply #5 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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