[ICOM] IC 765 Ant Tuner Problem

[Dave K6DLW]

Knowledge Base Article 5BBA692A36 IssueThe tuner on my 765 does not tune on
any band. Inspection reveals that only one motor is turning.ResolutionThe
motor gear assembly is jammed at one end of its tuning range. This failure
is usually caused by an attempt to tune an excessively high-SWR load. To
fix: Disconnect J6 connector on tuner unit and momentarily apply a DC
voltage (around 15 volts) to the stuck motor to un-jam it. Reverse the
polarity of the voltage to the motor if it doesn't unstick the first time.
Reconnect J6 connector and test the tuner. It should now work fine. If it
does not, the motor driver chip (IC2) has probably failed. CategoryAmateur :
HF : 765   Search Knowledge Base


----- Original Message ----- 
From: "Nathan Moreschi" <n4ydu at nc.rr.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Sunday, March 16, 2008 7:49 AM
Subject: [ICOM] IC 765 Ant Tuner Problem


For some unknown reason, the automatic antenna tunner in my IC 765 has
stopped functioning. When the tuner is engaged, the red light stays on and
does not turn off (the green light is on as well). The tuner does not make
an attempt to tune either. Could this be a relay?

Any ideas?

73,

Nate/N4YDU
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