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H P 45



#8

I have a HP 45 I bought new in 1973 while in college and have used since. I have had other calculators since including two other newer HP's but find the RPL with the stacked registers ect. to be the best system for my use, I also prefer the LED display.
Unfortunately my HP 45 is operateing irratically. It stoped charging the batteries several years ago, and now only self checks and works sporatically. I bought another HP 45 on E-bay, and it does the same thing. I now think the charger is bad. My question is who can check and repair the charger and calculators, I am trying to buy another charger on E-bay but would still like to have a backup. I am also confused about running the calculator without a battery pack from the charger.
Bruce


#9

To answer the last question first. You can run any 'classic series' HP calculator _without a card reader_ off the AC adapter without a battery pack installed. That means the 35, 45, 55, 70, 80. With these machines
the battery is disconnected from the calculator when the adapter is plugged in. Don't run the card reader models (65, 67) off the adapter without a battery fitted, it may damage the card reader sense amplifier chip.
Now back to the other questions. The only fault in the _calculator_ that would prevent a battery from charging would be a broken wire between the AC adapter plug and the battery pack. I've never seen this fault. So I think we can conclude the fault probably is the adapter.
The AC adapter is quite simple inside, with few custom parts. My guess in this case is that the smoothing capacitor has failed -- it's a 400uF electrolytic. Replace it with a 470uF, 25V (or higher) capactior. Obviously there's live mains inside the adapter, but there's no stored high voltages. Provided it's not plugged in, it's quite safe to open it up.
I can e-mail an ascii-art schematic of the 'classic' AC adapter to anyone that wants it, or I think it can be downloaded from somewhere on the CUCPS website.


#10

I'm sorry but I disagree Tony. I have an HP-21 and thought it was damaged when I got it because it showed a "running" display when I first switched it on powered by the AC adapter with the old battery still inside. Because I wasn't willing to give up I replaced the battery (see below) and volia, it worked fine. I therefore would recommend to replace the battery first and test again. To replace it the black plastic cover has to be cut horizontally so that it can be opened. Make a note how the original batteries are interconnected and located inside the plastic. The replace them with new NC batteries 1.2 V which have to be interconnected in the same way. Careful - don't short circuit them which can be easily done with the long metallic connector plates. Reassemble the plastic cover and fix it with sticky tape. If you have any more questions, please feel free to contact me via e-mail. Good Luck


#11

From my experience Tony is proably right. The HP45 charger is DC and filtered internally. It has separate "charge" and "run" suppies. The machine runs on the DC output totally independently of the battery when the charger is plugged in.

The Woodstock is charger puts out AC and depends a great deal on the battery to make smooth DC. A dead or missing Woodstock battery usually produces the flickering display (and shortly after a burned out machine)


#12

All,
David, and Tony thanks for the information it sounds correct. Do you know where I could get my charger repaired, or obtain a new one? I would hate to buy another defective 82002A charger and then have two I can't use.
Bruce

#13

For a Woodstock (HP2x) or Spice (HP3xE/C) I'd agree with you. Those machines use an AC-output charger that's half-wave rectified inside the calculator. They depend on the
battery pack both as a smoothing component and as a 'shunt regulator'. Those series will not work properly without a (good) battery in place, and in fact attempting to run them like that may canse damage (particularly on continuous memory models).
But this is not a Woodstock or a Spice, it's a classic (HP45). Classics use a 3 pin charger which contains a fair amount of circuitry. One pin is a ground. Another is a constant voltage output to run the calcualtor. The last is a constant current output to charge the battery.
When you connect a charger to a claassic, the connector pushes back a contact spring in the calculator that normally connected the battery to the logic. The battery is then connected to the constant current circuit, the logic to the constant voltage circuit.
It is quite safe to run a 35,45,55,70,or 80 without a battery pack in place. The logic will receive the correct smoothed voltage from the charger.
However, be warned that the 65 and 67 connect the card reader sense amplifier chip directly to the battery pack. Don't run one of those without a battery installed -- the constant current output of the charger can rise to around 17V, and the chip doesn't like that!


#14

thanks David, Tony for the additional info. I knew some of it but not all.


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