Mesa/Boogie Mark Five Owner's Manual download pdf (Page 13)

PAGE 9

The MARK IV uses a removable I.E.C. type power cord to supply the A.C. power. The power cord supplied with your unit should

be used whenever possible as we chose it for its snug fit. Because this type of RECEPTACLE is somewhat universal and used in

many products both in and out of electronic musical instrument domain, you may use other cords of this

type when the one supplied is not available. Should this become necessary, check that the cord is seated all

the way into the RECEPTACLE to insure an uninterrupted performance. In the U.S., the proper voltage is

117 volts A.C. (110-120). Always be sure to connect the MARK IV to its rated voltage to avoid damaging

internal circuitry.

The FUSE should be a 3 amp Slo-Blo for use with 100 or 117 volt A.C. Mains. Should the FUSE blow, replace it with a similar type and

rating, then watch the power tubes as you start the amp back up again.

Warm up the tubes first with the amplifier in STANDBY mode, then, watching them carefully, flip the STANDBY

switch to ON. If you see a tube arc or spark inside, that is definitely the problem and can be remedied by an

easy power tube replacement. In many cases though, the bad tube will only fail intermittently. Watch for a

while and if any tubes start to run red-hot, this is the cause of your original problem.

If everything appears OK, tap on each power tube to reveal the faulty one, because a blown fuse is nearly

always caused by a bad power tube (s). Running the amp in TWEED power will very likely offer a temporary

remedy and let you get through the gig. If the FUSE blows immediately when switching on the A.C. power (in

the STANDBY mode), then some other problem is the cause, most likely a failed rectifier diode. (See the section on tube maintenance

further back in this manual for more assistance and helpful hints on how to maintain the life of the power tubes).

REAR PANEL MKIV

A.C. RECEPTACLE:

FUSE:

3A SB

FUSE

117 VOLTS

60 HZ

4 AMPS

3A SB

FUSE

RECORDING

SLAVE (D.I.)

POWER AMP

TRIODE SIMUL-CLASS HARMONICS

PENTODE

CLASS A

SPEAKERS

8 OHM

4 OHM

MID GAIN

LEAD VOICING

LEVEL OUT

117 VOLTS

60 HZ

4 AMPS

EXTERNAL SWITCHING JACKS

RHYTHM 1

RHYTHM 2

LEAD

CLASS A/ SIMUL FX LOOP

REV FTSW.

SATELLITE EQ

SATELLITE SEND

SATELLITE

AUTO

RHY 2

AUTO

RHY 1

FX LOOP ON

FULL TIME

FX LOOP

SWITCHING

RHY 2

LEAD

AUTO ASSIGN SWITCHES

FX SEND

RETURN

LEFT

(STEREO)

RIGHT

(MONO)

SIG.

PATH

MODE SELECT

LEAD

EX SW

FT SW

RHY 1

RHY 2

HANDBUILT IN PETALUMA CALIFORNIA

GRAPHIC EQ

ON OFFAUTO R2

REMOTE

REVERB

REST AREA

3A SB

FUSE

117 VOLTS

60 HZ

4 AMPS

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Mesa/Boogie Mark Five Owner's Manual Page 13

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