Troubleshooting Problems

MP-1 MIDI not working

Started by niksa

Replies: 11
Views: 9,113

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

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

Started by Overtone85

Replies: 1
Views: 3,028

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

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

Started by Pedro

Replies: 14
Views: 5,449

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

MB-1 no output

Started by peoriashows

Replies: 7
Views: 4,875

July 28, 2018, 11:51:45 PM
by rnolan

Srange Chorus problem

Started by Pete66

Replies: 2
Views: 2,310

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

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

Started by Pork_Chop

Replies: 2
Views: 2,946

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

No Edit Function after replacing battery and eprom

Started by potus2028

Replies: 1
Views: 3,124

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

MP-1 got Noisy...

Started by rabidgerry

Pages1 2 3

Replies: 34
Views: 17,719

July 02, 2017, 04:53:43 PM
by MarshallJMP

4ohm Resistor Across C131 & D38 ?

Started by red2203stack

Pages1 2

Replies: 16
Views: 7,534

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

MP-1 volume drop

Started by revhed666

Pages1 2

Replies: 21
Views: 11,059

May 20, 2016, 08:24:13 AM
by Harley Hexxe

Bass setting not saving

Started by revhed666

Replies: 14
Views: 7,792

March 31, 2014, 09:51:25 PM
by rnolan

Gain drop

Started by Richie_B

Pages1 2

Replies: 17
Views: 9,164

July 12, 2016, 07:22:55 AM
by MarshallJMP

MOVED: Techniques and tooling

Started by rnolan

Replies: 0
Views: 3,133

April 16, 2016, 05:00:51 AM
by rnolan

MP1 wont work with either 2.0 or 2.01 EPROM

Started by rnolan

Replies: 3
Views: 3,047

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

MP-1 v.2 Not editable equalizer.

Started by RVLP

Pages1 2

Replies: 15
Views: 11,864

October 28, 2022, 09:18:08 AM
by MarshallJMP

Clicks when switching presets

Started by sadky

Replies: 6
Views: 5,314

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

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

Started by ScottGray

Pages1 2

Replies: 26
Views: 8,462

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

MP2 Volume drop

Started by Shredzilla

Pages1 2

Replies: 25
Views: 13,588

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

MP2 suddenly noisy after a show

Started by SidecarJoeG

Replies: 13
Views: 10,789

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

110v -> 220v

Started by Sirion

Replies: 2
Views: 3,403

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