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World of Ham Radio 1997
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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 # 52
MODEL: TS-520 / BS-5
SUBJECT: BS-5 SWEEP INTERFERENCE
BS-5 users may report ignition-like interference on 80 &40M
from their SM-220 with BS-5. Noise will be heard between 3850-3870
Khz, and 7245- 7260 Khz any time the scope is on.
The sweep signal mixes with the IF (carrier) frequency. This
derived signal, or its second harmonic will usually be less than an
S1 signal, unless the coax ground to the scope is opened, in which
case S9 may be indicated.
On the SM-220 PCB X65-1240-00, change the BS-5 +llV DC supply point:
1. Cut the foil path between connector P110 pin 6 &
Connector P103 pin 2.
2. Install a lS1555 diode between Connector P110 pin 6
and Connector P103 pin 1.
NEW Part 151555 Vll-0O76-05
Please notate your Service Manuals: SM220, TS-520 & TS-520S