Motorola MTR2000 T5544 Instruction / Field Service Manual page 273

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DESCRIPTION
The CLN1222 Power Supply Module is described in this section. This Power Supply is used on high power (i.e.,
>75 W) stations. A general description, identification of inputs and outputs, a functional block diagram, and func-
tional theory of operation are provided. The information provided is sufficient to give service personnel a func-
tional understanding of the module, allowing maintenance and troubleshooting to the module level. (Refer also
to the Maintenance and Troubleshooting section of this manual for detailed troubleshooting procedures for all
modules in the station.)
General Description
Motorola Inc., 2005
All Rights Reserved
Printed in U.S.A.
The CLN1222 Power Supply Module accepts a dc input (21 to 32 Vdc) and
generates three output dc voltages to power the station modules: +5.1 Vdc,
+14.2 Vdc, and +28.6 Vdc (input voltage dependent). The power supply is
a high-frequency switched mode design, utilizing Pulse Width Modula-
tion (PWM) control, all contained in a metal heat-sink, mounted on the
left-hand side of the station. The design provides for input reverse-voltage
protection, and output over-voltage/over-current protection.
The dc input connection is made at the rear of the station via an AMP Pow-
er Lock connector. Power supply cooling is provided by natural convec-
tion via the heatsink which is coplanar with the power supply circuit
board assembly.
Government & Enterprise Mobility Solutions
1301 E. Algonquin Road, Schaumburg, IL 60196
POWER SUPPLY
MODULE; DC-Only
MODEL CLN1222
(500 W, 21 to 32 Vdc Input)
68P81096E51-A
09/30/05-UP