Because of file size limitation, I have replaced photos with new, and perhaps more relevant ones.
I have this beautiful instrument in pristine unmolested condition, but alas, with a serious fatal fault. I am hoping friends here can help.
Basically, though marketed by HP, the 972A is made by Yokogawa in Japan; I can tell because its case and, indeed most contents, are the same as another of mine, Yokogawa 7544-02. The specs and features are different, however.
Inserting the two AA cells into the perfectly clean battery holder -- simply turns on the entire display with an initial beep. The buttons, including the power on, or even the rotary switch, have no effect at all. The all-characters display, presumably during some kind of POST going on, just refuses to yield to anything else. The auto-power-off function did not do so in half an hour.
Being sealed at case, it needed but little cleaning inside; this I have still done, by a dry brush, all around the two main chips; have restricted the use of isopropyl alcohol to the zebra stripe connector area because the selectively applied conformal coating seems to give.
I have tried the drying out and ionizer discharge techniques, to no avail. Not having any manual, I am next driven to 'locating a sweet spot' technique.
Alas, there is no Reset button, or I don't know where to look.
HP/Agilent and Yokogawa do not seem to offer any service manual for this elderly product; the user manual has a few lines of trouble-shooting, with zero helpfulness.
Yoko do not identify this model in their website, not even in the archives/obsolete products area; perhaps, they made it to a HP spec, and did not release with their own logo.
To say I would be grateful for help, any help, would be understating my position; I would give my eye teeth or unto half my kingdom according to choice.
Thank you, my friends.
NAJR.
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