Sencore lc53 manual

Now more than ever, the need to measure capacity value, leakage of the capacitor, inductor value and quality of the inductor has become very important. Without a good measure of these important parameters, proper circuit operation becomes more difficult. Now capacitors can be checked for value and for leakage at the rated working voltage on a digital readout.

Inductors can be checked for inductance and for quality with the patented Sencore ringing test. The LC53 is truly the first complete capacitor and inductor analyzer. Simply hook up the capacitor or the inductor, press the proper VALUE button, and read the value on the large digital readout. The Sencore patented ringing test checks coils, deflection yokes, and non-iron core transformers with an accurate check of good or bad. There are six switch selectable impedance matching positions to match the coil to the test circuit from 10 uli to 10 II.

Good coils will show 10 or more ringing cycles on the digital display while bad ones will show less than A special LEAD ZERO control lets you balance out the capacity or inductance of the test leads I'or those accurate readings of the very small capacitors and coils that you may encounter. Cirquit Diagram. Layouts are found on Sheet 2. Service and User Manual. Inside Back Cover. Add Comment. Notify me of new comments via email. Remember my form inputs on this computer.

I have read and understand the privacy policy. Value only testers, and bridges will mislead you. The use of capacitors in electronics has dramatically increased in the past few years and the forecast is for even a greater usage. The transistor has given way to the IC, but due to the nature and construction of the capacitor and the inductor, these are not replaced with ICs. The more ICs that are used, the more capacitors and inductors that will be used.

The use of electrolytic capacitors has also drastically increased as well as the capacity range. Lytics of 10, uF can be found in many consumer electronic items. Here's what I've done: 1. The display board is good 4. The analog board and digital board connections are all good - cleaned and tested. All of these check good and dead on. Nothing appears broken, loose or otherwise visually suspect 7. So, that's about all I can do without a service manual that has a troubleshooting section.

This thing is a rats nest of dozens of CMOS and TTL gates and switching transistors that all interconnect so I really can't develop an approach that let's me check things in a logical order. I hate to give up on it, but unless I get lucky or some service lit exists or both it's probably beyond me to fix. Helped me find the problem with my unit. Good luck. Incorrect cap values and no response when trying to zero leads: Check for pulse entering analog board at pin 11 and leaving at pin 7 Pulse should change when Caps Value button is pressed Check for shorted or open transistors TR20 and TR21 2N on analog board If TR20 is shorted the pulse will be only partial level Follow pulse through system to look for bad gates Check IC12 pin 12 on digital board for hz square wave.

Inductor test problems: Check for 20 volts DC at pin 20 of board interconnect Check for open series pass transistor TR11 2N on analog top board. Tim "One of the advantages of being disorderly is that one is constantly making exciting discoveries. Use a magnifying glass and check them all. Tim, did Sencore ever publish the theory of operation of that beast?

It's hard to figure out what they are doing, when you have to chase the circuit from one sheet to the other and back again. I'd be interested in any more troubleshooting tips, especially concerning the inductance function. Mine works pretty well, but I'd like to get the inductance ranges calibrated closer. Before I tweaked on it, some ranges wouldn't work at all. I got this info from calling their service department.

They were very helpful. I tested all the items that Tim had suggested. The Hz signal is perfect, the transistors are good and all the other items in that list checked out fine. Still, nothing has changed. The display powers up with three seemingly random numbers. The zero controls do nothing. I recently decided to check out the BCD counter IC7 which sends the signals to the display board to tell it which segments to light, thinking that this chip might cause an unchanging display.

There are four BCD outputs - two have strong pulses at all times and two have no pulses ever. This doesn't seem right. In checking this chip, the clock is good, the Memory Reset is low as it should be , the Disable pin is low again this is correct but the Latch Enable pin only has a small pulse of about 2Hz at about 3V while VCC is 7V. Tracking this latch enable back is difficult since it's connected to lots of things. Sooner or later, each number appears.

My next area to consider is the Zero adjustment itself.