Troubleshooting Problems

Troubleshooting hum and weird microphonics

Started by DesmoBob

Replies: 5
Views: 5,492

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

MP-1 diagnosis

Started by willem

Replies: 4
Views: 4,771

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

Very Strange Behaviour

Started by MikeB

Replies: 4
Views: 5,694

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

Programming patches - inconsistent behaviour

Started by MikeB

Replies: 4
Views: 4,757

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

MP-1 Classic dead

Started by tangohf

Replies: 4
Views: 4,258

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: 2,497

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

MP-1 full refurb and restoration

Started by Systematic Chaos

Replies: 4
Views: 2,509

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

LED Issue MP1

Started by Mojave

Replies: 4
Views: 4,775

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

Hum and Crack on DIST mode

Started by Jonar

Replies: 3
Views: 4,051

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

MP1 wont work with either 2.0 or 2.01 EPROM

Started by rnolan

Replies: 3
Views: 2,864

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

B200s hum

Started by duecemfhatchet

Replies: 3
Views: 2,918

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

front panel

Started by kserri

Replies: 3
Views: 4,671

December 03, 2018, 01:11:27 AM
by rnolan

Dialing Down on Signal Cut

Started by Chip Roberts

Replies: 3
Views: 2,251

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

ADA MP-1 Ground hum with good gain

Started by bunkyloo

Replies: 3
Views: 3,074

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

error codes

Started by Mike_Revis

Replies: 3
Views: 4,368

March 27, 2014, 03:45:20 PM
by MarshallJMP

110v -> 220v

Started by Sirion

Replies: 2
Views: 3,261

January 05, 2017, 09:07:01 AM
by MarshallJMP

No Distortion on the Distortion Channel

Started by Misticmyst73

Replies: 2
Views: 4,610

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

ADA MP1 - Tube Board Problem and Resolution.

Started by MR THUD

Replies: 2
Views: 2,524

November 12, 2021, 09:19:51 AM
by MarshallJMP

MB-1 Error Messages

Started by kawai2g4b

Replies: 2
Views: 5,227

November 29, 2013, 08:14:48 PM
by kawai2g4b

MP1 and Cold Exposure

Started by Chip Roberts

Replies: 2
Views: 4,273

December 10, 2017, 08:17:01 PM
by herbyguitar