This is what I found a service technical report from Kenwood acc. TM255
and TM455 9600bps Date November 8, 1994
SUBJECT: Countermessure against modulation during packet 9600bps operation.
A trouble modulation malfunction during packet 9600bps operation
was found in the manufacturing process even trough there in input
in the DATA terminal.
Pay heed to this trouble in replacing the analog switch IC13.
This trouble is cuased by variation in the analog switch IC13.
Even if the 9600bps SW Tr.(Q20:DTA124EK) has been turned ON,
the analog switch IC remains unstable.
We decided to raise the analog switch IC13 voltage while the
9600bps SW TR. (Q20:DTA124EK) is in action by changing the
chip resistor R117 in the TX-RX-unit of TM455A/E and of
R117=10K to be replaced with 3K3
So if you have problems with those two say to your dealer to ask for
SERVICE TECHNICAL REPORT No. B510-94-081E page 1/2 and page 2/2
Have you any tips, trick or modifications you can't find here, please E-mail them to me, or use the mail form. Can't you find a mods, please don't e-mail to me. All mods i have is listed on this site.! Back to start page