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Re: [TowerTalk] troubleshooting help: non-turning G-1000DXA rotor

To: Tower Talk List <>
Subject: Re: [TowerTalk] troubleshooting help: non-turning G-1000DXA rotor
From: Barry N1EU <>
Date: Sun, 2 Sep 2012 18:30:52 +0000
List-post: <">>
I'm all set with a schematic, thanks to K1LI.  It looks like the
obviously toasted transistor is Q1027 on the PS-Unit.

Barry N1EU

On Sun, Sep 2, 2012 at 4:23 PM, Barry N1EU <> wrote:
> I inspected the PSU PCB and see what might be a toasted SM transistor.
>  Photo (limited by camera's macro capability):
> But still hamstrung without a legible schematic.
> Thanks for any comments/advice,
> Barry N1EU
> On Sun, Sep 2, 2012 at 3:39 PM, Barry N1EU <> wrote:
>> The fuse is fine.  There's a faint "burnt" odor inside the controller.
>>  Transformer secondary voltages look good.
>> 1.  Does anyone have a legible copy of the schematic?  Yaesu's PDF
>> version is illegible at the component level.
>> 2.  The interconnect diagram clearly shows Q1/D2 connecting to the PSU
>> PCB via J1007.  Can someone please point out where the Q1/D2 circuit
>> is shown on the schematic diagram?
>> Thanks & 73,
>> Barry N1EU
>> On Sun, Sep 2, 2012 at 1:18 PM, Barry N1EU <> wrote:
>>> I'd appreciate any troubleshooting tips for a suddenly non-turning
>>> G-1000DXA rotor.  Cable continuity checks good, reading 500 ohms
>>> across the pot and 64 ohms across the motor back at the controller
>>> connector.  If I hang a voltmeter across the motor pins (4,5) on the
>>> back of the controller with cable disconnected, I don't see any
>>> voltage generated by the controller when I press the LEFT/RIGHT turn
>>> buttons.  Shouldn't I be seeing DC Voltage?  If so, do I next check
>>> the fuse on the PS-Unit PCB or ???
>>> Any advice appreciated.
>>> Tnx/73,
>>> Barry N1EU

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