Although not applicable when you have burnt parts, the 115BRs have to be started. They do not autostart by themselves.
Behind the front panel, near the top, are a pair of pushbuttons. You have to apply power, turn the meter to 10 kHz and push the button to start the first decade divider, then switch to the 1 kHz and repeat with the 1 kHz button. Then you have to spin the motor gear to start it turning. BTW, It will turn in either direction. -John ================ > Hi all, you may remember a while back that I put a lot of vintage test > equipment on the EEVBlog. > > Here is the address of that post: > > http://www.eevblog.com/forum/buysellwanted/vintage-50%27s-60%27s-test-equipm > ent-available/msg149549/#msg149549 > > > > Among the pieces was the HP-115BR. Several of you indicated an interest. > The first offer I got was for $250 and I accepted the offer and emailed > back > most of you who also had expressed interest. Before packing it up I > plugged > it in, applied a 100KHZ signal to the input, and nothing happened. The > voltage monitor meter showed nothing in any position. I opened the unit > up > and found that the 24 volt power supply transformer was burnt up. I > notified the original buyer that there was a problem and I would let him > know if I could get it repaired and we would go from there. > > > > Doing some trouble shooting it appeared that the 24 Volt DC line was a > dead > short to ground. Rather than start lifting leads from terminal strips, I > ordered and downloaded the User/Service Manual for the unit. It did not > take long to find that there were 4 Power Transistors that were dead > shorted. They were the Regulator pair and the Power Amplifier pair. > Replacements were ordered, installed, and the unit is back in top working > condition again. It has been on the bench running now for about a day and > a > half. Everything looks really, all the outputs have clean on frequency > signals, the tick pulse is there and the meter shows the correct > indications > for all positions, as indicated in the service manual. > > > > I am using a Thunderbolt-Trimble GPSDO to drive my frequency counter. The > counter has a 100KHz output that is driving the 115BR. I tuned in WWB on > 5MHz and started setting the 115 to match the time as close as I could. > Cranking the Milliseconds dial around, I was finally able to get a setting > where the tick output pulse was occurring in coincidence with the WWV time > tick. In the past 24 or so hours, it has not changed a bit, still right > together. An absolutely amazing piece of equipment for being built back > 50 > or so years ago. > > > > Anyway, I still want to sell it to someone who will give it a good home > and > put it to use. You can see by the pictures that there is some paint > missing > on the front panel where there was an ID tab removed. The insides look > just > like brand new! Has a built in 24 VDC power supply so all you need do is > plug it in to a 110 VAC outlet, put a 100KHZ signal into it, flip the > internal switch back and forth to start the unit running and then spin the > internal knurled knob to start the clock. And if you spin it the wrong > way, > it will actually run backwards as well! Full instructions for starting > and > setting the clock are in the manual. > > > > I have about $50 in parts and a lot of fun time troubleshooting invested > in > getting it restored to operation. I am asking $250, plus FedEx shipping > costs, and will include a set of 4 extra transistors, I bought two sets > just > in case, and the User/Service Manual on a CD. > > > > And oh yes, the original buyer used his funds for another purchase and > told > me to go ahead and offer it up again. > > > > Drop me an email if you are interested. My email address is: > [email protected] > > > > If I get multiple offers, I will consider them in the order they arrive. > > > > George Race > > Albion MI > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
