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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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1997-02-01
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==============================================================================
K E N W O O D
>>> A M A T E U R R A D I O S E R V I C E B U L L E T I N <<<
==============================================================================
Kenwood Service Centers
Kenwood Service Corporation Kenwood Service Center, East
2201 East Dominguez Street 829 Lynnhaven Parkway, Suite 130
Long Beach, California 90801 Virginia Beach, Virginia 23452
Telephone 1-310-639-5300 Telephone 1-804-340-1702
==============================================================================
BULLETIN # 1029
MODEL: TM-742A/TM-942A
SUBJECT: 28 MHz/50 MHz RC TX Failure
Symptom:
The 28 MHz and 50 MHz modules do not transmit after direct frequency entry
from the microphone when the radio is switched to the RC function.
Corrective Action:
Replace IC1 on the Control Unit X53-3460 B/2 and IC1 on the Display Unit
X54-3130 A/3.
Parts Required:
Qty Description Kenwood Part No. Circuit Description
1 Control Unit microprocessor HD6433388A07F IC1
1 Display Unit microprocessor HD404719A32H IC1
Caution: This modification requires soldering equipment rated for CMOS type
circuits. It also requires familiarity with surface mount soldering
techniques. If you do not have the proper equipment or knowledge do not
attempt this modification yourself. Seek qualified assistance.
Time required for this modification is 1.5 hours or less.
Service code A:84 B:X53-3460 B/2 C:IC1 D:91