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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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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.
 
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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?
 
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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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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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