MTHTrains MTH F-3 DIESEL ENGINE, Operating Instructions Manual

9

MTH F3 Diesel Engine

down even though the sounds play.  This simulates the wheel flange squeal of
a train travelling through a turn too quickly.

Note:  Consistent activation of the wheel flange squealing is determined by the 
condition of your transformer’s whistle button rectifier disc.  Older rectifier
discs may not release a clear and strong enough DC signal required by
ProtoSound’s computer to play the wheel flange squealing. 

SELF-RECHARGING BATTERY
BACKUP

  ProtoSounds® state-of-the-art design includes a self-recharging battery
backup system for improved performance at any speed.  The self-recharging
battery backup system is automatically turned on or off whenever track
power is turned on or off.  There are no switches to turn on or off to enjoy
the benefits of the automatic battery backup system.  The battery ensures
that power to the sound system will remain on during directional changes,
setting RESET options, or when traveling over dirty track and switches.

  The battery is a rechargeable NiCad type which is continually charged from 
the track when power is applied.  NiCad batteries are a dry battery and
should not leak or cause any damage to your locomotive and will last up to
five years or longer.  If you notice that the sounds seem distorted or garbled
at low voltages or become silent when power from the transformer is shut
off, the battery may be going bad.  Before replacing the battery, you should
put the engine in NEUTRAL and leave the transformer throttle at about 12
volts for fifteen minutes.  This should temporarily recharge the battery.  If
the garbled or distorted sounds are reduced, then your battery charge has
worn down.  You can give your battery a full charge by leaving the engine
ON in NEUTRAL for 16 to 18 hours.

REPLACING THE PROTOSOUND BATTERY  

  The ProtoSound® battery is a special NiCad 7-cell, 8.4v battery - NOT the
6-cell, 7.2v battery found in most convenience stores.  The 6-cell NiCad is
NOT recommended for use with ProtoSound® applications.  Replacement
ProtoSound® batteries are available from MTH ProtoSound Electronics at
7020 Columbia Gateway Drive, Columbia, MD  21046.  A standard 9v
alkaline battery can be substituted as a temporary fix, but since alkaline
batteries can’t take a charge, it will eventually wear down.  Regardless, it
should give you a week to a couple of months use while you wait for your
replacement ProtoSound® battery to arrive.