Rane TTM 56 Mixer Schematics

Page 1

CORPORATION

SERVICE BULLETIN

UNIT IN QUESTION: TTM 56
AREA CONCERNED: No Contact Magnetic Fader.

(Field inspection and maintenance.)

The TTM 56 uses our proprietary magnetic fader, utilizing hall sensors. Since the fader is
a primary area of tampering for customers, it is important to understand what is
happening and how to assure correct function during service or repairs.

Pictured below are the two sensors, support rods and carrier. The most important item to
confirm is the proximity of the hall sensors to the carrier. The correct distance is about
the same thickness as the PCB 7 minimum 0.062. If the distance is too great (i.e. the
sensor has been pushed away from the center of the fader, which commonly happens
during cleaning and lubrication, the symptom is typically bleeds with slow contour,
and failure to turn off with fast contour. This is due to the magnet not coming close
enough to the sensor for maximum attenuation. Gently tilt the sensor towards the center
of the fader mechanism. Leaning a bit too far inwards is better than the reverse, as it
ensures complete tum-off of the fader when using fast contour.

* l"

Tonlon sprlng

h

Mark lac-Iion before
disconnecting ribbon:

PGM 1 7 /
PGM 2 1 Remove rlbbon
XFADER

Sam's
Once the alignment of the sensors has been addressed, clean the two stainless steel rods
using a piece of newspaper wrapped around them. Loop the cloth around each rod and
polish just as if shining a shoe, but upside down. The newspaper will pick up dust and
contaminants from the rods and is easy to use. For stubbom deposits or in situations
where the customer has thoroughly contaminated the rods with foreign matter, isopropyl
alcohol applied with a Q-tip works well to cleanse the assembly. When all cleaning has
been completed a drop of light machine oil should be applied to the support rod only (not
the one the torsion-spring rubs against.) Just about any oil with a viscosity of 20W will
work, but we recommend pure silicone lubricant. Rane does not provide lubricants or
cleaners.

07-03-02 rev 1.1
CD