I purchased a brand new zed 436 on the 26th may 2011. However, all the faders except 1 feel like they have sand or somthing in them and the power supply fan is quite loud, what should i do, yours in anticipation andy.

The "PFL" Stands fo r"Pre Fader Level". Just in case you did not realize. so when you press the "PFL" button , and the red light goes out?, You're saying that the hissing goes away and that you have clarity. Yes? and the volume presents no issues? Also correct? Part of that simply, is with the PFL in the on position. You are engaging the fader for one, which will add to an already boosted signal ( the the fader is turned Up?). also you may have your Clip set incorrectly. to set this you turn PFL off, then at your signal input level Dial (usually at the very top in-line with your fader. _ set the volume on your device, then input clip level on the board \ to where the clip light comes on. not a steady light, but a blinking light so make it steady, then back it off a hair. Okay? this whole time make sure your mains are down. or off at the faders. Once clip is set., PFL is in off position, gradually turn your mains up to level. Now, the PFL is for when you have more than one signal. say from an instrument on another channel. unless you have that? No need to use the PFL. If you do have an instrument in line,. then, before you turn PFL on,make sure that your fader on that channel is turned off. -turn on your PFL, then gradually bring that to level. never messing with the mains level.

I know that is a lot of info. but it is a process. that should eliminate any hissing you may have heard.
Good luck!!
'

Hello,

Carbon track on fader 1 is open because of wear or just broken, if you are getting sound then the ground carbon track is out but certainly the problem lies in the pot.

https://www.learningelectronics.net/circuits/48v-phantom-microphone-power-supply.html

The fader pot will need to be replaced. There is no way to glue or repair the tab.

Make sure ALL interconnected equipment is powered by the same receptacle or power conditioner. Do NOT use separate recptacles at opposite ends of a romm for example. Run power extension back with your snake. There may be a failure in the unit. Since it is so new, exercise your warranty... do NOT risk voiding the warranty. Do verify that your power is clean.

gapoko

If you havent ground looped the chanels. Most of the time the chanels need to be cleaned.

I called Roland at the number that you provided and gave they following proceedure which will re-intialize the BR 1180 and ERASE everything that was created on the HD:

1. Simultaneously hold down button beneath volume control at track 5 and Undo/Redo button at upper right
2. Press power button while holding down buttons as above, until test menu comes up
3. Turn selector dial untill initialize screen shows
4. Prdess ENTER and initialization will start
5. Once initialization is completed, power off unit and then power it back-up.

NOTE: This proceedure erases all data!

If all other functions work for those channels, the most likely problem is the fader itself. These can fail and operate more like switches rather than faders. Without witnessing the behavior, I can not state that for sure. While these mixers are not the hardest to work on, they are time consuming. The faders can be purchased from Mackie directly. If you need to have this repaired, any shop that repairs audio gear should be able to erpair this for you. Where are you located?

Dan