K-3 does not turn on.

[Antonio Madeira]

Greetings, this is my first approach to the qth.net.

My K-3, assembled from the factory, quite a few years ago, shows the very
first failure,
it does not turn on. Voltage at the power socket is 13.5VDC.

Where shall I look?

Vy 73
Antonio  -  CU8AS
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[Thorsten Fricke]

Hi Antonio,

Am 05.06.21 um 16:23 schrieb Antonio Madeira:
 > Greetings, this is my first approach to the qth.net.
 >
 > My K-3, assembled from the factory, quite a few years ago, shows the very
 > first failure,
 > it does not turn on. Voltage at the power socket is 13.5VDC.
 >
 > Where shall I look?

Check, that you did not swap + and - of the power cable! Unfortunately
this happened once to me and this way I "desoldered" D11 and almost
desoldered D12 off of the KPA3 (luckily both diodes survived this
treatment and the K3 worked after putting them back in place again)

What happens if you remove the KPA3, does the K3 power on then?

 > Vy 73
 > Antonio  -  CU8AS
Sorry that's all I could contribute here
Vy 73 es 55
Thorsten, DH4FT
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