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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 # 1036
MODEL: TS-450S
SUBJECT: Parts Change
The 2SC2509 driver transistors are no longer available. They have been
discontinued by the manufacturer. A substitute transistor (2SC3133) is
available but requires some minor circuit changes These changes are detailed
below.
Parts Required:
Qty Description Kenwood Part No. Circuit Description
2 Driver Transistor 2SC3133 Q2, Q3
2 330 1W Carbon resistors RC05GF2H331J R8, R9
1 .047 uF Ceramic capacitor C91-0119-05 C2
2 220 pF Ceramic capacitor CC45SL2H221J C64,C65
1 560 pF Ceramic capacitor CC45SL2H561J C63
Procedure:
Make the following changes on the HF Final Unit (X45-3400-XX)
Change C2 to 0.047 uF. This is connected to the base of Q1
Change C63 to 560 pF. This is conneced to the Emitter of Q1
Change R8 and R9 to 330 0hm. These are connected to the collectors of Q2,Q3
Add 220 pF caps (C64,C65) from the collector to emitter of Q4 and Q5
Note: C64 and C65 should be soldered directly to the collector and emitter
pins of the final Transistors Q4 and Q5.
Time required for this modification is 60 minutes or less.