Tenma 72-4045A

[DMG1]

Hello all,

I am 21 and am teaching myself electronics slowly. My uncle was an EE and I have inherited some of his home bench equipment. One of which is a Tenma 72-4045 power supply with no manual. Extensive google searches for the manual have not turned up anything and Tenma's website is very thin on information. Their support page does not work and the phone number posted is for MCM Electronics, which is a retail website. If anyone has a copy of the manual, I would greatly appreciate it.

The reason I am looking for a manual is that I'm not sure if it is working properly. Channel A produces variable voltage on the meter and at the terminals. Channel B does not produce voltage on the meter nor at the terminals at any setting of the switches or dials. To be honest, I'm not really sure what the slide switch in the upper right corner is doing, so it is difficult for me to work it out without the B channel delivering voltage.

I removed the cover to check for overload fuses and there are none. Any information would be welcomed. Thanks for your time.

 

[hevans1944]

The slide switch in the upper right corner allows you to connect the A and B power supplies in series or in parallel and to have the B supply output vary (track) with the A supply control, or have both A and B supplies independently controlled.

The Tenma 72-4045A appears to be virtually the same as the B&K Precision 1652, except the latter has digital meters instead of D'Arsonval (analog) meters. You can download the B&K manual here to get some idea of the capabilities of your Tenma power supply. If the B supply is truly not operational, it should be fairly easy to repair after applying standard troubleshooting techniques.