Is it possible to have A3 schematic please.My unit says 616 AM Modulation path failure but the unit still doing AM fine. May be the detector or diag interface ?
Thanks in advance
The product you are asking about has limited support available as it is obsolete.
I think you may have found the Operation and Service Guide Agilent Technologies 8648A/B/C/D Signal Generator which lead you to the conclusion that the problem is with the A3 motherboard chip:
If your instrument is working fine but the error keeps popping up, look into resetting the instrument to attempt to clear the error messages.
Operation and Service Guide Agilent Technologies 8648A/B/C/D Signal Generator (page 1b-34 [pdf 82]).
Check out the extended service for your product here: 8648A - Extended Service . Repairs are subject to the availability of parts.
If you wish to speak with someone on the phone, call the toll-free number: 1 (800) 829-4444 Press #, then 2
You may also find additional help by checking out the links on this page:
Manuals for discontinued Keysight, Agilent, and HP test equipment
FYI, there is a replacement available for your instrument:
Hope this helps!
Any advice ?
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