Kenwood TS2000 Low Output 2m

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VK4UH
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Kenwood TS2000 Low Output 2m

Post by VK4UH » Fri Jan 04, 2019 11:38 pm

Thanks for reading this
A new fault has developed on one of my TS2000X with low RF output on 2m. Only about 30 watts being developed

Output on all other bands seems unchanged and all receive functions appear normal

I have seen reports of low output on 2m and HF on interweb but not this problem

Has anyone else experienced this issue?

Kevin VK4UH
Kevin (KJ) VK4UH
Brisbane

VK1JA
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Re: Kenwood TS2000 Low Output 2m

Post by VK1JA » Sat Jan 05, 2019 10:28 am

Hi Kevin,

You probably have already tried this, most new radios will wind back the power if the SWR is high. I'm guessing you tested the TS2000 into a dummy load?

Regards

Jayson

VK4UH
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Re: Kenwood TS2000 Low Output 2m

Post by VK4UH » Sun Jan 06, 2019 7:01 am

Thanks Jason
Yes I did conform this - but the logical first step

KJ VK4UH
Kevin (KJ) VK4UH
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VK6OX
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Re: Kenwood TS2000 Low Output 2m

Post by VK6OX » Sun Jan 06, 2019 9:43 am

KJ have you posed the question to the TS2000 Yahoo group?
You may find the answer there.
https://groups.yahoo.com/neo/groups/Ken ... roup&slk=1

Cheers
Andy
73
Andy VK6OX

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Re: Kenwood TS2000 Low Output 2m

Post by VK4GHZ » Tue Jan 08, 2019 10:46 am

KJ,
If the fault is limited to 2M only, then it must be the 2M PA stage Q101 Q102.
(HF & 2M share the same pre-driver chain, a 2SK2596 > 2SC1971, and then a pair of 2SC1972s. And you have indicated that HF O/P is normal)
TS-2000Block.JPG
Maybe one of the Q101 or Q102 devices has failed (or the bias/VCC to that device).

Get out the multimeter and/or CRO!
Adam, Brisbane
http://vk4ghz.com | VK4GHZ on Youtube
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