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

SRN - 1315

APC � 792, 103, 109

Date: December 2000

Memo To: SRN Mailing List Deadline: Sept 30, 2001

From: Radio Product Division Plantation Florida

Subject: CDM750, CDM1250, CDM1550, CDM1550LS / Transmit Lock-up when dekeyed

Symptoms:

TX Lock-up has been reported on some CDM radios. Mobile unit will stay in the transmit mode after PTT button on

microphone has been released. Any further PTT operation or time out of the programmable TX Time Out Timer will reset

the TX lockup malfunction.

Note: This symptom has been more prominent in LS models and conventional models utilizing MDC features.

Potential Problem Radios:

Models affected: AAM25KHC9AA1AN, AAM25KKC9AA1AN, AAM25RKC9AA1AN

AAM25SHC9AA1AN, AAM25SKC9AA1AN, AAM25KHD9AA2AN

AAM25KKD9AA2AN, AAM25RKD9AA2AN, AAM25SHD9AA2AN

AAM25SKD9AA2AN, AAM25KHF9AA5AN, AAM25KKF9AA5AN

AAM25RKF9AA5AN, AAM25SHF9AA5AN, AAM25SKF9AA5AN

AAM25RKF9DU5AN, AAM25SHF9DU5AN, AAM25SKF9DU5AN

Serial Number: 792IZUxxxx thru 792IATxxxx, 792TAAxxxx thru 792TATxxxx

109IZUxxxx thru 109IATxxxx, 109TAAxxxx thru 109TATxxxx

103IZUxxxx thru 103IATxxxx, 103TAAxxxx thru 103TATxxxx

Cause:

Root cause is a loss of the PTT release command during intensive radio and control head software activities.

Corrective Action:

Replace control head GCN6112A with GCN6112B.

Replace control head GCN6113A with GCN6113B.

Replace control head GCN6114A with GCN6114B.

Parts can be ordered from Accessories and Aftermarket Division at 800-422-4210.

Reference this SRN when ordering Control Heads at no charge.

For instructions refer to Basic Service Manual 68P81091C62

Parts and $15.00 labor is authorized by warranty. No other charges are authorized.

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