Troubleshooting Problems

Mp-1 v2 mod 3 no output in tube anything

Started by bunkyloo

Replies: 10
Views: 4,208

October 05, 2018, 02:16:17 AM
by rnolan

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

Started by Overtone85

Replies: 1
Views: 2,862

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

ADA MP-1 Ground hum with good gain

Started by bunkyloo

Replies: 3
Views: 3,041

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

front panel

Started by kserri

Replies: 3
Views: 4,629

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

Rack grounding?

Started by Georgeclooney0

Pages1 2

Replies: 29
Views: 8,771

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

4ohm Resistor Across C131 & D38 ?

Started by red2203stack

Pages1 2

Replies: 16
Views: 7,078

January 20, 2019, 04:36:13 PM
by red2203stack

MP1 Classic Clean Issue

Started by AndiK

Replies: 7
Views: 4,670

May 01, 2019, 04:06:36 AM
by MarshallJMP

MP1 wont work with either 2.0 or 2.01 EPROM

Started by rnolan

Replies: 3
Views: 2,804

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

B200s hum

Started by duecemfhatchet

Replies: 3
Views: 2,878

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

No lights, no display, no sound

Started by emunstar

Pages1 2

Replies: 25
Views: 8,806

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

no sound on outputs A and B, effects loop works

Started by ang3lus

Replies: 4
Views: 2,431

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

Latency with SPX90

Started by Chip Roberts

Replies: 13
Views: 5,648

July 01, 2020, 03:07:40 AM
by rnolan

Srange Chorus problem

Started by Pete66

Replies: 2
Views: 1,997

September 26, 2020, 12:43:27 AM
by Pete66

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

Started by ScottGray

Pages1 2

Replies: 26
Views: 5,079

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

ADA MP-1 v1.36 Switches on! Normal background noise there, but no Output!!!!

Started by Pedro

Replies: 14
Views: 3,560

November 24, 2020, 11:43:50 PM
by rnolan

MP-1 MIDI not working

Started by niksa

Replies: 11
Views: 7,329

January 10, 2021, 06:30:02 AM
by MarshallJMP

Dialing Down on Signal Cut

Started by Chip Roberts

Replies: 3
Views: 2,006

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

MP-1 no display or LED's

Started by andtimebegins

Pages1 2 3 ... 5

Replies: 70
Views: 10,359

February 09, 2021, 06:36:21 AM
by Iperfungus

MP1 1.38 - Is my Chorus failing???

Started by skarkowtsky

Replies: 11
Views: 2,741

May 09, 2021, 02:50:58 AM
by MarshallJMP

Fixed: MP-1 with ALL clip leds lit solid and NO sound (long post)

Started by Pork_Chop

Replies: 2
Views: 1,700

November 12, 2021, 09:17:43 AM
by MarshallJMP