Motorola MTR2000 T5544 Instruction / Field Service Manual page 261

1
DESCRIPTION
The CLN1221 Power Supply Module is described in this section. This Power Supply is used on low power
(i.e.,30/40 W) stations. A general description, identification of inputs and outputs, a functional block diagram,
and functional theory of operation are provided. The information provided is sufficient to give service personnel
a functional 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
Note
Motorola Inc., 2005
All Rights Reserved
Printed in U.S.A.
POWER SUPPLY MODULE
(250 W, 50/60 Hz, 85 to 264 Vac Input)
The CLN1221 Power Supply Module accepts an ac input (85 to 264 Vac,
50/60 Hz) and generates two output dc voltages to power the station
modules: +5.1 Vdc and +14.2 Vdc. The power supply is a high-frequency
switched mode design, utilizing Pulse Width Modulation (PWM) control,
all contained in a metal heatsink, mounted on the left-hand side of the sta-
tion. The design provides for over-voltage/over-current protection.
The ac input connection is made at the rear of the station via an IEC-type
connector keyed to accept only high temperature type mating connectors.
Also provided is a Battery Backup connection. Power supply cooling is
provided by natural convection via the heatsink which is coplanar with
the power supply circuit board assembly.
An external battery charger system is required to support the battery
backup feature.
Government & Enterprise Mobility Solutions
1301 E. Algonquin Road, Schaumburg, IL 60196
MODEL CLN1221
68P81096E34-C
09/30/05-UP