gme tx 4000 repair

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Silverghost 2
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gme tx 4000 repair

Post by Silverghost 2 » Mon Apr 04, 2016 9:55 am

Hi just wondering if anyone would have a repair manual for a gme tx 4000 that I've been given to try and repair. Not powering up. Nothing obvious in it so I have to dig deeper.
Thanks.

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Scannersplitterguy
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Re: gme tx 4000 repair

Post by Scannersplitterguy » Sun Apr 10, 2016 9:43 pm

http://www.scannerantennasplitter.com
http://www.acdcmanuals.com
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Yipyip46
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Re: gme tx 4000 repair

Post by Yipyip46 » Mon Apr 11, 2016 9:15 am

Good Morning Silver Ghost 2, The TX4000 has several common faults causing it not to power up. First check the 18 v Zener diode to see if it is short circuit. If it is the a PCB track running under the filter inductor is probably O/C. If the power is reaching the Zener then check the power to the 2 x 5volt regulators (1 next to the VCO chamber and 1 in the front right hand corner). These are the most common faults. If these check out ok then I have seen the 2200uF filter cap next to the VCO chamber leak and desolve the PCB tracks under it. If that is the case throw it in the bin. Other faults for not turning on are a faulty 5.00 mHz crystal and intermittant connections to the ON/OFF switch. The TX4000 is more than 15 years old now and specialized parts like displays and micros have not been available for a long time. Good luck with the repairs Regards

YipYip

Silverghost 2
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Re: gme tx 4000 repair

Post by Silverghost 2 » Thu Sep 22, 2016 9:40 am

It's all good now. Been a while since I've been back on here. Found the zener diode was blown. But also under the rf choke it had blown part of the track. Had to take choke out to find it. Repaired and given back but only to have it returned with another power problem. He had blown another zener and blew another spot on the track. Short story is don't try running tx4000 off of solar panels connected to a battery then run to the radio. It was creating a power spike more than 18 volts and blowing whatever it could to survive. Thanks.

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