Troubleshooting Problems

Hum and Crack on DIST mode

Started by Jonar

Replies: 3
Views: 4,121

August 31, 2014, 01:28:19 PM
by MarshallJMP

ADA MP-1 Ground hum with good gain

Started by bunkyloo

Replies: 3
Views: 3,233

November 10, 2018, 02:50:27 AM
by MarshallJMP

Dialing Down on Signal Cut

Started by Chip Roberts

Replies: 3
Views: 3,138

January 22, 2021, 05:54:36 PM
by Harley Hexxe

MP1 wont work with either 2.0 or 2.01 EPROM

Started by rnolan

Replies: 3
Views: 3,015

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

B200s hum

Started by duecemfhatchet

Replies: 3
Views: 3,052

August 20, 2019, 09:24:04 AM
by MarshallJMP

MP-1 Classic dead

Started by tangohf

Replies: 4
Views: 4,295

December 07, 2014, 04:50:19 PM
by MarshallJMP

no sound on outputs A and B, effects loop works

Started by ang3lus

Replies: 4
Views: 2,650

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

Very Strange Behaviour

Started by MikeB

Replies: 4
Views: 5,767

June 12, 2015, 03:21:17 PM
by MikeB

Programming patches - inconsistent behaviour

Started by MikeB

Replies: 4
Views: 4,796

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

MP-1 diagnosis

Started by willem

Replies: 4
Views: 4,819

December 02, 2014, 10:55:53 AM
by MarshallJMP

MP-1 full refurb and restoration

Started by Systematic Chaos

Replies: 4
Views: 4,025

November 23, 2022, 07:09:05 AM
by MarshallJMP

LED Issue MP1

Started by Mojave

Replies: 4
Views: 8,402

December 31, 2023, 12:47:45 PM
by Mojave

Solid State Clean Gets Nasty

Started by Moff40

Replies: 5
Views: 2,731

August 29, 2022, 09:34:51 PM
by Moff40

MP-1 Classic Noise Gate "stuck" at max values even when turned off

Started by Bret

Replies: 5
Views: 12,137

April 24, 2024, 03:19:42 PM
by Harley Hexxe

Front panel don´t work

Started by kserri

Replies: 5
Views: 5,166

January 30, 2015, 04:21:33 AM
by rnolan

Ground hum noise

Started by dave_daut

Replies: 5
Views: 5,032

April 08, 2014, 08:45:59 AM
by rnolan

U.S. MP-1 Repair

Started by kfowler8

Replies: 5
Views: 5,495

September 06, 2016, 06:28:36 PM
by kfowler8

Troubleshooting hum and weird microphonics

Started by DesmoBob

Replies: 5
Views: 5,537

July 01, 2015, 05:51:55 AM
by rnolan

Clicks when switching presets

Started by sadky

Replies: 6
Views: 5,291

October 03, 2014, 05:47:22 AM
by Systematic Chaos

MP1 Classic Err 7

Started by leninvargas

Replies: 6
Views: 6,494

May 08, 2023, 12:50:40 PM
by MarshallJMP