Troubleshooting Problems

MP1 No Overdrive/Distortion

Started by Billy Penn

Pages1 2

Replies: 23
Views: 11,905

July 12, 2016, 06:38:00 AM
by rnolan

MP1 Tube board issues, like am radio

Started by monty

Pages1 2

Replies: 20
Views: 13,119

January 22, 2016, 12:35:39 AM
by tomy

MP1 v 1.38 no sound can someone help me out?

Started by Wormwoody

Pages1 2

Replies: 16
Views: 8,451

May 05, 2018, 10:06:19 AM
by Wormwoody

MP1 V2 (no top switch) All original excluding battery mod

Started by ScottGray

Pages1 2

Replies: 26
Views: 4,887

October 18, 2020, 11:03:11 AM
by MarshallJMP

MP1 wont work with either 2.0 or 2.01 EPROM

Started by rnolan

Replies: 3
Views: 2,785

June 15, 2019, 08:48:09 AM
by MarshallJMP

MP2 starts out quiet but gets gradually more noisey

Started by h.e.l.shane

Replies: 0
Views: 3,185

July 21, 2014, 10:39:10 PM
by h.e.l.shane

MP2 suddenly noisy after a show

Started by SidecarJoeG

Replies: 13
Views: 10,546

May 10, 2014, 07:12:23 AM
by MarshallJMP

MP2 Volume drop

Started by Shredzilla

Pages1 2

Replies: 25
Views: 13,186

July 27, 2014, 12:23:00 AM
by Shredzilla

New Member - just got an old MP-1 - no sound - it does turn on

Started by Overtone85

Replies: 1
Views: 2,843

October 30, 2018, 01:03:45 PM
by MarshallJMP

No Distortion on the Distortion Channel

Started by Misticmyst73

Replies: 2
Views: 4,567

December 05, 2013, 04:44:31 PM
by SidecarJoeG

No Edit Function after replacing battery and eprom

Started by potus2028

Replies: 1
Views: 1,157

October 14, 2022, 09:30:47 PM
by rnolan

No lights No sound and a hot ic

Started by t-rack

Pages1 2

Replies: 20
Views: 10,980

April 28, 2015, 02:38:42 AM
by MarshallJMP

No lights, no display, no sound

Started by emunstar

Pages1 2

Replies: 25
Views: 8,729

March 04, 2020, 11:42:35 AM
by MarshallJMP

No Power, No Display, No Output

Started by Chip Roberts

Pages1 2 3

Replies: 38
Views: 16,450

December 23, 2017, 08:35:04 AM
by MarshallJMP

No Sound

Started by 2ndmoto

Pages1 2

Replies: 18
Views: 11,908

January 18, 2014, 05:50:06 AM
by MarshallJMP

no sound on outputs A and B, effects loop works

Started by ang3lus

Replies: 4
Views: 2,399

April 15, 2020, 01:27:32 AM
by rnolan

No sound on select preset channels and weird output level knob behavior

Started by Andrew Smith

Replies: 2
Views: 3,612

March 07, 2018, 04:22:32 PM
by Andrew Smith

Programming patches - inconsistent behaviour

Started by MikeB

Replies: 4
Views: 4,713

March 18, 2015, 09:39:15 AM
by MarshallJMP

Rack grounding?

Started by Georgeclooney0

Pages1 2

Replies: 29
Views: 8,611

December 04, 2018, 11:07:57 AM
by rabidgerry

Rear Input Jack

Started by Jaster

Replies: 1
Views: 3,759

March 16, 2015, 04:05:22 AM
by rnolan