Adcom Gtp-500ii Fm Problem - diyAudio
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Old 11th April 2008, 05:20 PM   #1
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Default Adcom Gtp-500ii Fm Problem

Have chance to get GTP-500II FM tuner/preamp cheap. Has intermittent FM delivery..told this is common when unit ages ..Anyone have experience with this unit/problem??????
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Old 11th April 2008, 05:23 PM   #2
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Anyone have a schematic??
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Old 11th April 2008, 05:51 PM   #3
Westley is offline Westley  United States
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This was a common problem that invloves the replacement of the FM trimmer capacitor. I seem to remember it being C4 but that was 15 years ago so I'll check the manual when I get home. It is a very simple repair.
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Old 28th April 2008, 08:45 PM   #4
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Did you ever get a chance to check that service manual?
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Old 30th May 2008, 09:33 PM   #5
TerryC is offline TerryC  United States
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The part # is CT-104, and it is located inside the metal box. I've made this repair successfully multiple times using Mouser P/N 659-GKG10015. Once replaced, you will need a DVM to bring the circuit back into alignment. I can provide instructions for performing the alignment.
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Old 16th June 2008, 06:22 AM   #6
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Default Can you post those alignment instructions?

My GTP-500II just started experiencing this the intermittent FM reception problem... Can you post those instructions on how to re-align the FM Tuner after replacing the cap?
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Old 27th June 2008, 01:19 PM   #7
gregbed is offline gregbed  United States
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This website has all the details.

http://www.vgernet.net/bks0731/comms/adcom.html
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Old 27th June 2008, 04:15 PM   #8
TerryC is offline TerryC  United States
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From the service manual....

http://i41.photobucket.com/albums/e2...500IIAlign.jpg

Don't attempt beyond steps 1 & 2 unless you have the specialized equipment.
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Old 7th July 2008, 01:00 AM   #9
gregbed is offline gregbed  United States
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Terry C
I am trying to do this repair for the first time. I have a solid metal cage around FM section. It looks like the top is soldered on. How do open this? Do you just desolder the corners and inside side and pry it open? Any tips or tricks would be appreciated.
Greg
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Old 7th July 2008, 02:38 AM   #10
TerryC is offline TerryC  United States
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Quote:
Originally posted by gregbed
Terry C
I am trying to do this repair for the first time. I have a solid metal cage around FM section. It looks like the top is soldered on. How do open this? Do you just desolder the corners and inside side and pry it open? Any tips or tricks would be appreciated.
Greg
Yes, one corner at a time. Any cheap soldering iron with a large tip will work. I used some wick to get the majority of the solder off, then heat it up again and pry it open.
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