Vs1680 channel 8 and Guit Hiz not working

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#1792811 - 05/27/22 06:13 PM Vs1680 channel 8 and Guit Hiz not working
RD RD Planeteer Registered: 07/29/02 Posts: 1393 Loc: Michigan, someplace near a swa...	Hello all...for some reason I can't get my input 8 nor the Guit HiZ inputs to work...channel 7 and the other inputs work...wondering if I might have damaged the input with some of the preamp stuff I had plugged in...anybody have any insights to help me think this through? (Update: plug in 8, nor the HiZ dont rout to any other channels...I can route for example channel input 7 to track 8 just fine. So it appears the input pre may be acting up on channel 8/HiZ) Anybody ever have this issue? Also, I just had a thought: can I use an external preamp to feed the channel? (Will be trying that shortly!) Second update: so, if I run a tube amp in line from elec guitar to channel 8/HiZ, I get VERY low signal but some signal. If I plug guitar into SansAmp pedal, into channel 8 same thing...very low signal with the pre trim far left...here's the interesting thing (and it only happens on channel 8/HiZ)...if I turn up the trim pot at all, there is a thwipping sound and all volume drops to zero... I'm baffled.... Edited by RD (05/27/22 07:33 PM) _________________________ Using my original VS 1680 27 years now and counting!
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#1792852 - 05/27/22 07:52 PM Re: Vs1680 channel 8 and Guit Hiz not working [Re: RD]
uptildawn uptildawn Planeteer Registered: 12/15/01 Posts: 8976 Loc: on land	From what you say - Channel 7 & 8 are usually paired/linked. At first I considered that your input mixer settings were favoring channel 7 (as in, maybe the pan was turned all left - to ch-7). But that doesn't seem to be the issue if you've checked all your routing options and nothing fixes it. I'm left to assume that you have indeed got a problem with channel 8's input, after reading through your testing results so far. Not sure what to suggest about tracking down the issue though. I've pretty much lost all whatever electronics sleuthing skills I once had. _________________________ uptildawn
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#1792893 - 05/27/22 11:00 PM Re: Vs1680 channel 8 and Guit Hiz not working [Re: uptildawn]
RD RD Planeteer Registered: 07/29/02 Posts: 1393 Loc: Michigan, someplace near a swa...	We've got a semi retired Roland guy here in SW Michigan who has just told me to bring it over...so I'll report back what the issue is...in a week or two...yeah, I was running signal off an old tube amp into channel 8 and I wonder if I didn't overload the thing... Edited by RD (05/27/22 11:01 PM) _________________________ Using my original VS 1680 27 years now and counting!
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#1795715 - 06/17/22 05:27 PM Re: Vs1680 channel 8 and Guit Hiz not working [Re: RD]
RD RD Planeteer Registered: 07/29/02 Posts: 1393 Loc: Michigan, someplace near a swa...	Tech called me and said a chip failed on channel 8...he has it on order. That's great news that he can still obtain it! _________________________ Using my original VS 1680 27 years now and counting!
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