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Help with Spectra HP PTT/output issue

This forum is for discussions regarding all aspects of Motorola radio programming, including hardware, computers, installation and use of RSS/CPS, firmware upgrades, and troubleshooting. There are subforums for discussions of codeplugs, and also for software/firmware release notes and issues.

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Mraudio
Posts: 100
Joined: Sun Jan 27, 2008 6:48 am
What radios do you own?: Quantar/AS/A-spec./VertexP25

Help with Spectra HP PTT/output issue

Postby Mraudio » Sun Jan 27, 2008 7:04 am

Hi somewhat new here...been around awhile but have forgotten all my old PW and user names. Anyhow Im having an issue with a spectra PTT circut and I dont have access to a service manual. Seems as though it has exciter power as I can see RF on the monitor however the PA dosent come up. I swapped out controll and MLM board with a known working unit and it works fine, ruling out any RF amp/vco issues. So with that I am suspecting the transistors/fets along the back of the logic board that attach to the frame with the metal clip. If I am indeed correct wich one of those 3 or do all of them enable B+ for the PA power amp section? Secondly whats the part numbers so I can order replacements. Thanks!
Jeff

Will
Posts: 6823
Joined: Tue Sep 04, 2001 4:00 pm

Re: Help with Spectra HP PTT/output issue

Postby Will » Sun Jan 27, 2008 4:54 pm

Mraudio wrote: I am suspecting the transistors/fets along the back of the logic board that attach to the frame with the metal clip. If I am indeed correct wich one of those 3 or do all of them enable B+ for the PA power amp section? Secondly whats the part numbers so I can order replacements. Thanks!
Jeff


Those are voltage regulator transistors. The keyed 9.6 and the power control comes from transistors on the bottom of the command board.

Mraudio
Posts: 100
Joined: Sun Jan 27, 2008 6:48 am
What radios do you own?: Quantar/AS/A-spec./VertexP25

Re: Help with Spectra HP PTT/output issue

Postby Mraudio » Wed Jan 30, 2008 7:51 am

Thanks Ill take a peek later. Looked like the traces went to the back edge connection where the PA jumper cable plugs in. What I get for assuming
Jeff


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