Replies

1. 
   dgreen | Nov 28, 2008 07:42am | #1

   You want a freakin haircut over the phone?

   Need brand, model number of the tool and part number of the charger.

   After that we can probably help you.

   And would be happy to.

    

    

   ................................................

   Men will never be free until the last king is strangled with the entrails of the last priest.
   ~ Denis Diderot

2. 
   davcefai | Nov 28, 2008 09:34am | #2

   The voltages of good batteries should be a multiple of 1.2 (+ a little bit) when discharged.

   If you measure the voltages of all four, one of them should be significantly lower than the others as at least one cell is shorted out and therefore not generating a voltage.

   If you get one battery which is clearly lower than the others then it is probably the dud one. However the responsibility is yours. I'm only trying to help.

1. 
   RJT | Nov 29, 2008 07:31pm | #3

   Hitachi 9.6V 1.4h-1h model UC9SD
   input: 120V
   output: 9.6V DC 1.55A
   discontinued several years ago. Here's the situation: If all batteries are drained, how do I use a multi-meter to find which are good or not? How do I check the charger?

1. 
   dgreen | Nov 29, 2008 08:03pm | #4

   Here is the service manual for that charger. It has a good troubleshooting flow chart.

   Most likely you will find the fuse has blown, usually from charging batteries in rapid sucession. 

    

   ................................................

   Men will never be free until the last king is strangled with the entrails of the last priest.~ Denis Diderot

   
1. 
   RJT | Nov 30, 2008 07:53am | #6

   Much thanks, also thanks for that "haircut over the phone" quip, never heard that one before, I think I'll wear that one out.

1. 
   dgreen | Nov 30, 2008 07:56am | #7

   It's stood me in good stead, hope you get as much mileage out of it as I have!

   Post some more if you don't have any luck with the manual and we'll see if we can get you going. 

    

   ................................................

   Men will never be free until the last king is strangled with the entrails of the last priest.~ Denis Diderot

2. 
   davcefai | Nov 29, 2008 11:02pm | #5

   When the batteries are drained they will not be zero volts. Like I said, they should be close to a multiple of 1.2V. The one which differs from the others by 1.2V or more will be the faulty one. So in your case 3 should be around 9.6V and one will be 8.4 or less.To check the charger first plug it in and see whether you have about 9.6 to 10 volts on the output.If not then the fuse may be blown. I don't know if it is removable from the outside. If it is, remove it and check it for continuity.If it is not then you need to crack open the case. Possible failures are: fuse, transformer, diodes. All of these are relatively cheap components which are easily replacable if you have the diagnostic and soldering skills.Given that you are asking this question I would suggest that you get an electrician or a hobbyist friend to look at it. Apart from the obvious shock danger, if you do the wrong thing you may end up claiming on your fire insurance. Please don't blithely assume that since it is a low voltage circuit it is safe.Be aware that if the batteries are several years old they will have deteriorated so that you can expect the others to start giving up the ghost.I hope this helps.

1. 
   RJT | Nov 30, 2008 07:57am | #8

   Thanks, this will help! I do my own electrical; house wiring, but haven't done much small electrical motor stuff. I tear computers apart and put them back together, but a little 9.6 battery/charger stumped me. Next I'll put up my other project, renovating a 40+ year-old powermatic 45 lathe.

1. 
   RJT | Dec 03, 2008 05:30am | #9

   Found a little fuse inside the charger and it is blown, thanks for the suggestion. Where would you get something like that?

2. 
   davcefai | Dec 04, 2008 12:05pm | #10

   Any Electronic components shop should stock miniature fuses.Take the blown one with you or note the rating and whether fast or slow blow.

3. 
   RJT | Dec 05, 2008 04:55am | #11

   Good news! got the fuse, good batteries identified & charged, we're back in business. Much thanks to all!