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Servicing Precautions
It is important to know what type of power units you have for the reasons
listed below:
1. Because of differences in the electronic design, it is not possible to
operate Pioneer and Todd power units of the same type in a redundant
power supply configuration. In other words, you may not connect a
Pioneer Multi-Output unit in parallel with a Todd Multi-Output unit,
and you may not connect a Pioneer +5 Volt unit in parallel with a Todd
+5 Volt unit.
2. A Model 2200 switcher with Todd power supply units may operate on
110VAC. Pioneer supply units must always operate on 220VAC.
3. Todd +5V power supply units are internally wired for power surge
protection, Pioneer +5V power supply units are not. There is a jumper
in the Model 2200 fan assembly at the top of the Signal Processor Frame
which must be set to either bypass or enable a surge protection circuit
depending on the type of unit present. Refer to the “Fan Jumper
Settings” heading in Section 2 in this manual.
Before replacing your power supply, you will need to determine the type
of supply units you have. To do this:
1. Locate the assembly number sticker on the back of the power supply
frame. Systems with Pioneer power units will have power supply
frames numbered 098901-00
or -01. Systems with Todd power units
will have frames labeled 098901-03
.
2. Remove the back covers on the left and right sides of the primary and/
or redundant power supply frames. Leave the covers off for installation
purposes later.
You may distinguish between a Todd supply and a Pioneer supply as
follows:
Viewed from the front, both +5 V and Multi-Output Pioneer units are
each about 5 inches wide, and each has a 4 1/2 inch diameter fan.
The Todd +5 V unit (on the left) is about 3 1/2 inches wide. The Multi-
Output supply is slightly narrower. Each supply has two cooling fans.
From the rear, the Todd and Pioneer +5 Volt units can also be identified
by the positions of the large power lugs on the rear of the supplies.
They are arranged horizontally on the Pioneer supplies, and diagonally
on the Todd supplies. For clarity however, both types of supplies will
be illustrated in this manual in most cases.