Many have posted of difficulties getting enough volume when they connect Archos Jukeboxes, CD players, etc. to the Stereo Input connections on their SR2x’s. I’m among them. The problem is that the sound does come through, but it’s too soft to hear (or hear easily) with the engine running.
Some have no problem at all; this is not a CONSISTENT problem for all installations. Others have changed squelch settings and perceived an improvement. Not so for me - nothing worked.
My Avionics shop notified me yesterday that Garmin issued Service Bulletin No. 0113 on July 13th.
This modification increases the gain of the Music1 and Music2 inputs from unity gain to a gain of 10 dB.
Note This modification will increase the music level from Audio Devices connected to the Music1 and Music2 inputs, but may also increase unwanted noise levels.
This modification consists of the removal of four (4) resistors inside the unit.
The SB goes on to say that this is modification will be done only if the customer requests it; the unit will not be changed in production. As such, the work (2 hours) will not be covered under any warranty, but will be the responsibility of the customer.
I thought that 2 hours was a lot, until I read through the rest of the SB and realized that the work covers the removal of the surface-mounted resistors (either 2 or 4, depending on the exact model). Surface-mount components present a particular difficulty for many (most?) avionics shops, because often they’re not properly equipped to deal with this technology. In addition, the unit must then be put through a standard battery of tests before being returned to service.