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TK-890 remote won't power up unless I put ground to control head Pin 3

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IdaScan

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Nov 24, 2005
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Middleton, Idaho
Just inherited half a dozen high power TK-890 remote single band single head radios with KCH11 heads to manage for our local ham group. Applying power to the input lead had no effect. On the 9 pin drawer side of the radio there were two wires coming off of it:

Pins 2 & 3 spliced together, manual says BTL Output for Remote Speaker (ES2) and Remote Speaker Switch (RS1)
Pin 6 BLT Output for Remote Speaker (ES1)

Attempted to apply power to Ignition Sense pin 1 (IGN) at the radio with no luck. Then tried applying power to the 12 pin connector on the control head pin 1 (IGN) with no luck. By sheer coincidence I applied ground to pin 3 (EARTH) on the control head and the radio powered up.

Any idea why it would behave like this? Verified both control head cables are firmly seated and the shield wire is connected.
 

IdaScan

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Nov 24, 2005
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No audio from the 9 pin on the back of the radio and a buzzing sound on the control head pins 10/11 on the 12 pin connector... Thoughts?
 

IdaScan

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Nov 24, 2005
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Middleton, Idaho
I've looked extensively thru the service manual, no mention of buzzing on the speaker output of the remote 12 pin connector :)


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bruch

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Roanoke, VA
The 890 ( and whole x90 mobile series) has 2 audio amps in it, they can be accessed by the 9 pin molex on the radio itself. Pins 2 and 6 are the 5 watt audio amp output and pins 7 and 8 are the 15 watt audio amp, do not ground either side of the speaker. To use the internal speaker of the control head (if you have teh KCH-10) then pins 3 and 6 on the 9 pin molex should be jumpered. If these don't work, you may have a problem with the radio.
 
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