home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
World of Ham Radio 1997
/
WOHR97_AmSoft_(1997-02-01).iso
/
mods
/
kenwood
/
asb_text
/
asb0947.txt
< prev
next >
Wrap
Text File
|
1997-02-01
|
2KB
|
59 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 # 947
MODEL: TS-440S
SUBJECT: OPERATION WITH THE MC-85
With some TS-440S transceivers, insufficient modulation may
occur when the MC-85 compression switch is turned on. This
may be caused by too much of a voltage drop across resistor
R172 on the IF unit of the transceiver . If this is found to
be the case, change the resistor from 1K ohm to 100 ohms.
REQUIRED PART
100 OHM, 1/6 WATT RESISTOR.......RD14CB2C101J
PROCEDURE:
1. Disconnect the power supply and antenna from the
transceiver.
2. Using a #2 Phillips screw driver, remove the 9 screws
from the top cover of the transceiver. Remove the cover
and unplug the speaker wire.
3. Locate resistor R172 on the component side of the IF
board (Figure 1).
4. Using a #1 Phillips screw driver, remove the 7 screws
that secure the IF unit to the chassis of the
transceiver.
5. Pull the board up and rotate it towards the front of the
transceiver to expose the foil side of the board.
6. Desolder and remove resistor R172 from the board.
7. Install and solder the 100 ohm resistor in place of
R172.
8. Assemble the transceiver by reversing steps 1 - 5.
Time required for this modification is 0.5 hrs or less.