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HP92 & 97 charger anomaly



#2

I was looking at some of my dead hanger queen calculators (a couple of 97s and a 92) and noticed that the charger for these says it is 8v 3A, but the calculator input line says 5v 2A. Does anyone know what gives here? IT is the correct model charger according to the hpmuseum site, and the site states that it should be 8V 3A, but all three calculators show different. Is this why only one of the three chargers I have seem to work? Or is this just a coincidence.


#3

The 8V supply is correct.

Before I got a charger for my 97, I used a bench supply, and IIRC it wouldn't draw any current at all at 5V. 6V - 8V was OK. (This assumes that you have NiCd batteries in place.)

#4

I am not specially familiar with HP 92 & 97 models, but it seems that such adapters are OK.

Could you verify if the adapter legend states 8 Volts AC or DC ?

Also, taking other experiences into account, be sure you have good NiCd rechargeable batteries in place, and that all contacts are clean, without corrosion. In other models, if you use the adapter without rechargeable batteries, or with damaged batteries, or with bad contacts, then the calculator may be ruined by excessive voltage.


#5

Yep, it says 8V AC. I haven't run these with batteries because I don't have a functional battery pack. I know I have one somewhere, but misplaced it. I was trying to run these just off of the AC adapter, but it sounds like this was a bad idea. I have done this with classic models with no problem.


#6

Running Classics from the AC adapter without batteries is OK, but, for instance, will damage (100% chance) a HP21/22/25. I am not sure about the printing models, but it is preferrable to see if there are explicit reference in the manuals regarding no batteries use. The default is that batteries are requiered.


#7

Classics have an AC adapter that provides a regulated supply voltage for the calculator that's separate from the charging voltage. (That said, I found that you can't run the card reader of an HP-65/67 from the adapter alone; you need working batteries.)

Anyway, this is not the case with the printing models. Those are more like Woodstocks in this regard, in that the battery plays a role in regulating/filtering the voltage. They're less likely than Woodstocks to be damaged if you run them without batteries (presumably because the adapter has a lower idle voltage, and the machine itself runs off a higher battery voltage) but they certainly don't work from the adapter alone and the risk of damage is there.

Viktor

#8

Both the 8VAC 3VA (not 3A) on the charger and the 5V marking on the calculator are correct; however, the marking on the calculator refers to the DC (battery) voltage.

Viktor


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