SERVICE AND REPAIR NOTES
Bulletin
TECHNICAL INFORMATION /COMMERCIAL, GOVERNMENT & INDUSTRIAL SOLUTIONS SECTOR
8000 W. SUNRISE BLVD. / PLANTATION, FL 33322

SRN -1348
APC -103, 109, 792
Date: Oct 2001

Memo To: SRN Mailing List

Deadline: May 30, 2002

From: Radio Products Division, Plantation, FL.

Subject: CDM750, CDM1250, & CDM1550 Low Band Model ONLY - False Synthesizer Unlock Alarm

Symptoms:

Upon starting the vehicle, the radio will sound a continuous tone with Synth Unlock appearing on the display model, has been reported on some CDM Low Band Mobiles. Changing a channel or cycling power on the radio will correct the problem.

Potential Problem Radios:

Model:        AAM25BKC9AA1_N, AAM25CKC9AA1_N, AAM25DKC9AA1_N
                AAM25BKD9AA2_N, AAM25CKD9AA2_N, AAM25DKD9AA1_N
                AAM25BKF9AA5_N, AAM25CKF9AA5_N, AAM25DKF9AA5_N

Serial #        103TBExxxx thru 103TBTxxxx
                 109TBExxxx thru 109TBTxxxx
                   792TBExxxx thru 792TBTxxxx

Cause:

Engine noise enters the radio power leads and causes a false reading in the Synthesizer Unlock detection circuit.

Corrective Action:

Flash radios with R04.02.08 firmware flash tool. The Flash tool with instructions can be downloaded  two ways:

  1. Download the Executable File
  2. Download to 4 floppy diskettes

from the Dealer Access Secure Motorola Online Web Site.

$20.00 labor is authorized by warranty. Contact your local Motorola Authorized Service Representative to arrange for this modification. No other charges are authorized.

Only warranty work performed by an Authorized Motorola Service Center will be eligible for reimbursement.

Agency Approved product should follow the guidelines for repairs and service.

If applicable, enter this information or note this bulletin number and subject material in the appropriate equipment instruction manuals and make necessary schematic diagram changes. Enter this bulletin in the correct MASTER and CLASSIFIED INDICES for future reference.

Labor or parts warranty reference is limited to products sold and in use in the United States, for products sold or in use internationally this bulletin is for informational purposes only. Radios that are Agency Approved must follow designated agency guidelines. SRN-ISO