Hi Steve,
Thanks to your instructions I tried to troubleshoot the swr problem.
I monitored the IC960 and J2005-20 with some readings but nothing on the display. I also checked the ribbons with no results.
I will not go any further, unsoldering the bottom circuit plate, unless you have something else to suggest.
Despite this "minor" problem the rig is a fine piece of radio.
Thank you for your precious help.
Best regards and Merry Christmas to you and your family.
Georges SV1MOZ
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--- In ic7000@..., "Steve W3AHL" <w3ahl@...> wrote:
You will need a Service Manual to do any troubleshooting. The SWR detector (D962) and bufffer amp (IC960) are easily accessed on the bottom of the PA board by just removing the bottom cover. They are near the ANT1 connector corner of the board by the grounding fingers.
IC960 pin 1 outputs the HF reflected power signal and could be monitored with a DVM.
That voltage goes to the LOGIC card via two stacking connectors, then to the CPU as REFL signal, which results in the SWR meter display value. It can be monitored on the MAIN board at J2005-20, by removing the top cover. It is near the front of the board on the top side. If the signal is good there, then the problem could be the stacking connector to the LOGIC board or the CPU. I don't suggest trying to troubleshoot any further unless you are experienced with surface mount components, ESD protection, etc.
If the SWR display is not working, it is also possible that the SWR power foldback protection circuit is not working, which could result in damage to the HF PA FET's if the SWR is greater than 3:1. So, be careful until the problem is resolved.
It is suggested that you include your call sign in your posts....
Steve, W3AHL
--- In ic7000@..., "baulard69" <georges@> wrote:
Hi,
I resetted thi rig but nothing, no swr! All other meters are working fine.
Who could tell me were to look on the board?
Thank you for your time!!
