Troubleshooting Problems

Fixing-up any old gear

Started by vansinn

Pages1 2

Replies: 15
Views: 20,276

February 15, 2017, 10:27:25 AM
by DannyjoeCarter

No chorus and distorted SS voicing after noise mod

Started by Moulashaker

Pages1 2 3 ... 6

Replies: 81
Views: 2,153

July 09, 2024, 11:53:15 AM
by Gregg

MP-1 no display or LED's

Started by andtimebegins

Pages1 2 3 ... 5

Replies: 70
Views: 20,177

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

No SS voicing

Started by Tweeddeluxe1

Pages1 2 3

Replies: 41
Views: 928

June 28, 2024, 02:46:53 AM
by rnolan

No Power, No Display, No Output

Started by Chip Roberts

Pages1 2 3

Replies: 38
Views: 18,315

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

MP-1 possible issues after noise mod (OD1 LED clipping at low gain)

Started by Loktite

Pages1 2 3

Replies: 38
Views: 1,050

November 05, 2024, 12:16:48 PM
by MarshallJMP

MP-1 got Noisy...

Started by rabidgerry

Pages1 2 3

Replies: 34
Views: 18,625

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

Viper probs, info moved from Schematics section

Started by guitardude57

Pages1 2 3

Replies: 32
Views: 16,289

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

MP-1 A channel much quieter than B

Started by Mxzx

Pages1 2 3

Replies: 31
Views: 16,927

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

ADA mp1 - Solid States works only

Started by gg85

Pages1 2 3

Replies: 31
Views: 12,410

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

Rack grounding?

Started by Georgeclooney0

Pages1 2

Replies: 29
Views: 10,210

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

Sound issues after noise mod

Started by Deregorn

Pages1 2

Replies: 29
Views: 15,429

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

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

Started by ScottGray

Pages1 2

Replies: 26
Views: 9,787

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

No lights, no display, no sound

Started by emunstar

Pages1 2

Replies: 25
Views: 9,814

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

MP2 Volume drop

Started by Shredzilla

Pages1 2

Replies: 25
Views: 14,224

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

Loud pop/click when changing to a preset with clean tube voicing

Started by RobinL

Pages1 2

Replies: 25
Views: 1,099

July 29, 2024, 11:52:44 AM
by MarshallJMP

MP1 No Overdrive/Distortion

Started by Billy Penn

Pages1 2

Replies: 23
Views: 13,345

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

MP-1 volume drop

Started by revhed666

Pages1 2

Replies: 21
Views: 11,565

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

[Solved by MarshallJMP] MP1 doesn't start up - mysterious blinking

Started by hal2000

Pages1 2

Replies: 21
Views: 14,769

January 27, 2014, 10:03:05 AM
by MarshallJMP

MP1 Tube board issues, like am radio

Started by monty

Pages1 2

Replies: 20
Views: 13,893

January 22, 2016, 12:35:39 AM
by tomy