On Wed, 01 Aug 2018 22:26:27 -0700, Fotopiggie wrote:

+AD4 Thanks but that's Sw7600's manual. Mine is a ICF-7600D, an older model.
I
+AD4 actually have got the service manual but I don't have the proper gears
+AD4 like a RF generator to do the job. Better find someone else to do it....

Or buy another one and keep your current one for parts. Or just live
with the error. The cost of getting a qualified tech to even diagnose
the radio might exceed the cost of a good used radio.

The only thing I can see that looks like a screwdriver adjustment to
change the radio's frequency is T 11, the AM 2nd IF VCXO adjustment.
It's a crystal oscillator at 55.395 Mhz. Could T11 pull the crystal
oscillator 5 MHz? That's more than I'd expect but I dunno. Anyway, why
would it be off? These things should hold their adjustment within a
small range indefinitely.

If you want to try your luck, try pressing around the circuit board with
the plastic part of a stick pen or some other nonconductor like that. If
the display corrects itself, you probably have found a bad solder
connection.

Otherwise, it's probably too much of a PITA to make it work perfectly
again.