Help! Need some pictures of SM 900/500.

mroku91 · #1 03-24-2010, 02:13 PM

Hi. I have got problem with my sm900. I bought one (prefender) and somody has changed input jacks (IMO not correctly). Active bass (MM sr5) works perfect on both inputs) but when i plug passive bass (PB for eg.) in PASSIVE input i'm hearing strange hum. I'ts not so loud but it's iritating. Everything is ok with Active input. The problem is just with passive instruments plugged to passive input. I think it may be something wrong in connections of these jacks cause when i unsolder wires from passive jack and connect it directly to bass Cable there was no hum.

Can somebody upload some picture of inside sm900/500 (he jack inputs from inside and how is the wiring look)
Thanks!

**bass4worship** · #2 03-24-2010, 02:19 PM

Sound like your passive bass is not grounded properly or the jack on the amp is not making good contact on the ground

mroku91 · #3 03-24-2010, 02:27 PM

I've already tried other guitars and cables. All passive instruments are working great at Active input. My PB is grounded and sheielded. I play this PB at other amps and there was no problem.

**bass4worship** · #4 03-24-2010, 08:34 PM

Then bad jack on amp or maybe you should check the solder's joints on the board