home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
World of Ham Radio 1997
/
WOHR97_AmSoft_(1997-02-01).iso
/
mods
/
kenwood
/
asb_text
/
asb1046.txt
< prev
next >
Wrap
Text File
|
1997-02-01
|
2KB
|
37 lines
==============================================================================
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 # 1046
MODEL: TS-850S
SUBJECT: Mixer FET Change
Symptom: Several units were discovered during production by our QC department
that experienced difficuty when the transceiver was being adjusted for an
S-1 reading on the S-Meter.
Countermeasures: Variations in the gain of the devices used for Q16 and Q17,
the second mixers, on the RF Unit (X44-3120-00) appear to cause of this
symptom. We, therefore, recommend replacing these two transistors with
2SK520 (K43) devices. These devices have lower IDSS (Drain breakdown current),
and therefore provide a greater conversion gain. As a result the total gain
of the circuit is increased.
Parts Required:
Qty Description Old Part No. New Part No. Circuit Description
2 Second Mixer FET 2SK520 (K44) 2SK520 (K43) Q16, Q17
Time required for this modification is 60 minutes or less.
Service code A:43 B:X44-3120-00 C:Q16 D:91