SERVICE AND REPAIR NOTES
Bulletin
TECHNICAL INFORMATION / 8000 W. SUNRISE BLVD. / FT. LAUDERDALE, FL 33322

SRN -1314

APC � 422

DATE: August, 2000

Deadline: 6-30-01

Memo To: SRN Mailing List

From: Radio Products Division, Plantation, FL

Subject: Intermittent Frequency Shift on CT250 and CT450 Series Radios

Symptoms:

A user in a high noise environment may intermittently experience the following symptoms.

1) Intermittent poor system access (trunking or conventional)

2) Intermittent poor audio quality (trunking or conventional)

3) Intermittent frequency shift (when measured with a suitable analyzer)

The same symptoms may be experienced if a user is using a low impedance microphone accessory.

Please note that these symptoms may occur very intermittently or not at all depending on how the radio is used.

Potential Problem Radios:

All CT250 and CT450 radios that contain firmware version R02.00.03 and earlier.

Models Affected: AAH34KDC9AA1AN, AAH34KDC9AA2AN, AAH34RDC9AA1AN, AAH34RDC9AA2AN,

AAH34SDC9AA1AN, AAH34SDC9AA2AN, AAH34KDH9AA6AN, AAH34RDH9AA6AN, AAH34SDH9AA6AN,

AAH34SDF9DU5AN, AAH34SDH9DU6AN

Serial Numbers: 422TZWxxxx through 422TAPxxxx

Cause:

CT250 and CT450 series radios can produce a frequency shift, due an open modulation path muting during the first few

milliseconds of transmit.

Corrective Action:

The radio must be upgraded with the latest version firmware (Version R02.00.04 or later) to correct this issue. The firmware

version in the portable can be found by referencing the rear serial label. This firmware upgrade cannot be done in the field and the

affected units must be sent to one of the Depots for the upgrade.

Motorola Inc. Motorola Federal Technical Center

3761 South Central Avenue 4395 Nicole Drive

Rockford, IL 61102-6772 Lanham, MD 20706-4349

800-227-6772 or 815-489-1000 (800) 969-6680 or (301) 731-6676

Note: The Motorola U.S. Federal Government Depot is primarily used for all Federal Government Customer

Accounts.

When returning the portable please reference this SRN.