on 13.04.2004 15:51, Rob G at [EMAIL PROTECTED] wrote: > Now the question: This version only has a single output jack for sound > output (I believe the real Umax S900 has two, both one on the front and one > on the rear?). > > When a stereo headset or a set of powered speakers are hooked up to the rear > port of this Marathon I am only getting one channel (left channel). What I > have noticed tho, is that this S900 mainboard has another set of pins (for > Audio, Speaker, Pwr LED, Reset Switch). The odd part is the Audio pins (a > bank of 5 I believe) has a jumper module in that pins 1 and 3 are connected > (shorted). > > First, does anyone have a Marathon S900 to help me understand what / if any > purpose this other set of pins is for, and why the pin 1 and 3 may be > shorted. My first thought is this is for the Umax S900 front panel, but why > short two of the pins?
Hi Rob, Welcome 8^) The pins that would normally go to the front panel headphone jack are shorted to mute the built-in speaker. > Are there any issues with Stereo sound on the Umax S900? (it does not appear > to work in OS 9.1 either).... > The AD-DA converters are no worse than those used on Apple's own motherboards, rife with spurious ground loops and DC offset issues, as any converter would be if it were housed in such an electrically and magnetically noisy environment. Automatic Gain Control [AGC] is on by default which more or less compensates for this when recording from typical pop music sources. I'd check connections and wiring to restore the stereo channels, and of course that jumper--perhaps it belongs on 1-2, or 3-4? [I don't recall for sure.] Other than that, there is no known flaw or deficiency in design that would cause this. Peace, paul -- Paul F. Henegan <[EMAIL PROTECTED]> -- SuperMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | Service & Replacement Parts [EMAIL PROTECTED] | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> SuperMacs list info: <http://lowendmac.com/supermacs/list.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/supermacs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
