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Hi Ken

I have adjusted frequency on an IC-2820H and ID-5100 that also drifted low in frequency after more than 10 years of aging.
The method used for those is found in each radio service manual downloaded from your favorite source.
The same cable connects to the ID-1 and the PTT function works as for the IC-2820H and ID-5100.
PTT has to be pushed while setting the frequency otherwise it is not savable.
One connection with a 22k ohm resister between 8-pin mic socket 2-7 is not used on the ID-1 and only on the IC-2820H and ID-5100.
With reference to the IC-2820H and ID-5100 service manuals several buttons are pushed simultaneously and in the case of the ID-5100 the SQL controls are set to precise positions in order to allow the adjustment mode to be available.
So I'm thinking that there might be a hardware solution yet. If I push a few buttons while standing on my head the ID-1 might allow me adjustment access.

I was thinking of writing to Icom USA or Australia for help as Icom Japan just replied today (via the New Zealand agent) that sorry but they no longer have that Adjustment Software.
How did Icom service these rigs or did they never need service? There are thousands on them in service. They were produced between 2004 and approximately 2016 being replaced by the IC-9700 or possibly the IC-9100 before IC-9700 release.

I'll experiment over the next few days and see how I get on with my cable jig connected.

73 and good DV, John ZL2TWS