Yes, you are correct. The hear clear is only used in the 900 mhz spectra. Changing the CAPS should help especially aroung the audio amp chip. I have not had any issues with the VHF Spectras giving a popping sound except I had to replace the audio amp chip in one. It was fun to do but at the same time I replaced the capacitors. I purchased the audio amp chips from Motorola and they weren't too expensive. Sounds like you may have found your problem with the audio. Good luck in the repair of the Spectra. David -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tim Ahrens Sent: Tuesday, November 24, 2009 10:32 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Spectra Audio Popping after Capacitor replacement Hi David,
Is the Hear Clear board only on the 900 mhz spectras? I was looking in my service manual, and it talks about the board plugging into P501, but on my VHF spectras, this plug is unpopulated.. As a side note, when I went to replace the capacitors, I noticed that a fire ant had given it's life while spanning a couple of pins on the audio output TDAxxx part. There seemed to be some 'liquid ant residue' remaining, so perhaps it damaged the audio amp. I guess I'll have to look at the thing with the scope & see what's going on in comparison to one that works 'correctly'. Thanks! Tim
