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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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asb1051.txt
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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 # 1051
MODEL: TM-732A
SUBJECT: Control PC Board B+ Foil Damage
Symptom: Unable to turn on the power. No DISPLAY illumination, radio does
not function.
Countermeasure: The B+ circuit foil path near connector CN403 of the
CONTROL Unit is burned open. This symptom can occur when the front panel
is unplugged from the main chassis while the power is still turned on.
Adding a resistor in series with the "B" line will help to limit current
flow and prevent/limit this symptom from occorrinq.
Parts Required:
Qty Description New Part No. Circuit Description
1 4.7 ohm chip resistor R92-1281-05 R290
Procedure:
On the TX-RX Unit (X57-4000-xx/B4) cut the PC Borad trace from the "B"
line on CN203 that goes to the DC 13.8 Volt line. Install the 4.7 ohm
resistor across this cut.
CN203
8C O
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E O Cut Trace and add resistor here
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B O----------xx-----> To DC 13.8 volts
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Caution: This modification requires advanced surface mount soldering
equipment that is rated for CMOS circuits. It also requires familiarity
with advanced surface mount soldering techniques. If you do not have the
proper equipment or knowledge do not attempt this modification yourself.
Seek qualified assistance from your closest Kenwood Service Center
(Long Beach, CA, or Virginia Beach, VA).
Time required for this modification is 60 minutes or less.
Service code A:01 B:X57-4000 C:R290 D:91