Troubleshooting Problems

MP1 No Overdrive/Distortion

Started by Billy Penn

Pages1 2

Replies: 23
Views: 12,279

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

MP2 Volume drop

Started by Shredzilla

Pages1 2

Replies: 25
Views: 13,460

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

No lights, no display, no sound

Started by emunstar

Pages1 2

Replies: 25
Views: 9,096

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

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

Started by ScottGray

Pages1 2

Replies: 26
Views: 7,350

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

Rack grounding?

Started by Georgeclooney0

Pages1 2

Replies: 29
Views: 9,196

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

Sound issues after noise mod

Started by Deregorn

Pages1 2

Replies: 29
Views: 14,769

June 19, 2014, 02:41:35 PM
by MarshallJMP

ADA mp1 - Solid States works only

Started by gg85

Pages1 2 3

Replies: 31
Views: 7,439

October 05, 2023, 11:42:29 PM
by rnolan

MP-1 A channel much quieter than B

Started by Mxzx

Pages1 2 3

Replies: 31
Views: 15,902

February 12, 2014, 06:32:21 PM
by El Chiguete

Viper probs, info moved from Schematics section

Started by guitardude57

Pages1 2 3

Replies: 32
Views: 15,321

June 02, 2017, 03:28:21 AM
by MarshallJMP

MP-1 got Noisy...

Started by rabidgerry

Pages1 2 3

Replies: 34
Views: 17,496

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

No Power, No Display, No Output

Started by Chip Roberts

Pages1 2 3

Replies: 38
Views: 17,290

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

MP-1 no display or LED's

Started by andtimebegins

Pages1 2 3 ... 5

Replies: 70
Views: 14,720

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