FUSE:
This is the A.C.’s (Alternating Current) main fuse and provides protection from outside A .C. fluctuations as well as power
tube failure damage. Should the FUSE blow, replace it with the same rating in a Slo-Blo type package. The Domestic 117V and Japa-
nese 100V versions requires a 4 amp Slo-Blo fuse. A power tube short or failure is often the cause of a blown fuse...
Follow the cold start procedure mentioned in the STANDBY switch section and watch the power tubes as you flip the
STANDBY to the ON position. If a power tube is going bad or is arcing you will see it! Flip the STANDBY switch down
immediately and replace the faulty power tube and the FUSE if necessary.
If you see nothing abnormal as you lift the STANDBY switch, it is possible that a power tube shorted temporarily and
blew the FUSE. If this is the case it may work again normally. To be safe, you might want to replace just the adjacent tube or all power
tubes in the “shotgun” troubleshooting tradition and save the replaced set as spares. Spare fuses are a must for the fabled cord bag
along with your spare tubes. Always carry both for they could be worth their weight in gold someday.
EXTERNAL SWITCHING:
These four jacks are provided so that you may control the 3 Channels, the EQ and the SOLO feature
with an external master Switching device. This is essential to use the MARK V as part of a Midi rig where all sounds are called
up via a Midi Foot controller and both amplifier and effects settings are stored under a midi program number. The logic used to trig-
ger these ports is simple tip-to-ground, latching type and most Master switching systems incorporate several jacks
dedicated to this logic.
The EXTERNAL SWITCHING jacks override the MARK V’s Foot controller. Once a Channel or Feature has been
triggered “On” at the EXT. Switch ports, it may not be controlled or turned “Off” until the logic at the Switch Port is
reversed.
EFX LOOP: Series
The MARK V handles outboard processing by providing an on-board patch point between the preamp and
power section. This loop is wired such that the dry signal is in series with the effected (wet) signal. The circuit also
incorporates a SEND LEVEL control allowing you to fine tune the output of the preamp circuit to match the input
sensitivity of your processor (or first processor in a rack system). The EFFECTS LOOP circuitry can be completely
removed from the signal path with the HARD BYPASS/LOOP ACTIVE mini toggle. This removes all associated
loop circuitry from the chain and ensures the purest signal path and maximum sonic performance when outboard
processing is not being used. The SEND and RETURN jacks incorporate switching elements so that you may use
the LOOP ACTIVE selection and activate the Front Panel OUTPUT and SOLO controls with nothing connected to the Loop.
NOTE: The Front Panel OUTPUT and SOLO controls are both part of the Loop and therefore active only when the Effects Loop
is engaged. They are both part of the Return stage and will remain inactive as long as the loop bypass mini toggle is set to HARD
BYPASS.
rear panel: fe a t u r e S
PAGE 40
REAR VIEW: MARK V
™
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