PSB F-485
This Bulletin Number is PSB F-485
APC : 678, 760, 866 & 867
Date: October 14, 1996
Deadline Date:March 31, 1997
MEMO TO: PSB Mailing list
FROM: Product Group / Plantation, Florida
SUBJECT: GTX & LCS/LTS2000 Radios : DTMF
Tone Distortion and Power Down Problems
Symptom 1:
After initiating a Telephone Interconnect call, either by using
the portable key pad, or using a preprogrammed lists, the user
hears the dial tone and touch tones, but the radio intermittently
fails to generate a call. The radio returns to the dial tone
mode.
Radios Affected:
All GTX, LCS, & LTS radios, portable and mobile, manufactured
prior to 8/15/96.
- Mobile serial numbers - 867SWLxxxx through 867SWQxxxx,
760SWLxxxx through 760SWQxxxx
- Portable serial numbers - 866SWLxxxx through 866SWQxxxx,
678SWLxxxx through 678SWQxxxx
Also, the software version can be determined by using the RSS
(Radio Service Software) in the following manner:
- - Read the radio codeplug with RSS
- - From the main menu select F1 (Help)
- - Press F9 (More Help)
- - The software version should be displayed in the right
column. If the Portable radio does not have version 1.07
or higher; if the Mobile radio does not have version 1.08
or higher , they are susceptible to this failure mode.
Cause:
A timing issue within the radio firmware prevented the DTMF tones
from being decoded correctly.
Corrective Action:
All radios experiencing this problem should be returned to the
Rockford Support Center for have the firmware installed; version
1.07 for Portables and 1.08 for Mobiles.
Symptom 2:
When using a DTMF microphone (HMN3013A), the mobile radio does
not power down when using the rotary knob. In the case where
ignition sense is used, the radio will function properly and
power down when the ignition is turned off.
Radios Affected:
All GTX & LCS mobile radios with date codes of 9631 or
earlier using the DTMF Microphone - HMN3013A. Radios that have a
blue mark on the bottom side of the housing, have already been
reworked and do not require this fix. The problem is ONLY
observed when the rotary knob is used for power down rather than
the ignition switch. Mobile serial numbers - 867SWQxxxx,
760SWQxxxx
Cause:
The impedance presented by the DTMF microphone (HMN3013A) was
incompatible with the circuitry within the radio.
Corrective Action:
All radios meeting the above criteria should be returned to the
Rockford Support Center to have resistor R0231 changed from zero
ohm part (0662057B47) to a 10K part (0662057A73). Radios that
have been corrected per this PSB will be identified by a blue
mark on the bottom of the radio.
Level 1 charges are authorized by warranty for shipping these
radios to Rockford. Both symptoms will be corrected by
referencing this bulletin.
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