Actuatoare, pozitionere, motoare H-H

[nicuvu]

am un acuator de 7 ani pot sa spun ca ma scot din sarite cu multa munca si multumesc in special lui mastru zildan fara el nu reuseam a schimbat reed relul ala ..!!! am " RESUTIT SA IL aduc la viata e munca laborioasa nu este de joaca cu antenna mare mai ales cum am eu abacus aia de 1.8 cu motor de 1.8 daca nu esti atent 1- firele de contact atentie mare dar sunt foarte ms ca la-m facut eu prind 100est=45 west cu acutor de 24 aveam inainte cu astea de 18 greu de dus pina acolo ...!!!

[dingo31]

Asa cum am zis la #03, acel releu reed se arde destul de des, dar poate fi foarte usor de inlocuit, maxim 5-6 lei. Sunt unele modele de 2 cm, altele de 3 cm. Ambele sunt eficiente. Este un fel de dioda magnetica care inregistreaza rotatia rotorului magnetic din actuator, ca un fel de tahometru de bicicleta. Asa arata aceste releuri magnetice reed, nu trebuie neaparat sa fie ca acele originale din pozitioner, care sunt tot aceleasi tip de releuri reed, doar ca sunt imbracate intro carcasa dreptungiulare de plastic.

[zildan]

Nu am testat dar cred ca daca intercalezi o rezistenta de valoare mica (zeci de ohmi) scapa releul reed daca gresesti firele.


Manual Strong V50

[zildan]

How to repair the Superjack / VBox II Positioner


Post by tek2000 » Thu Jan 05, 2023 6:10 pm
All,


Here are some helpful suggestions for repairing your Superjack / VBox II positioners. You will need a voltmeter to troubleshoot and find the faulty component(s). Refer to the diagrams below.










COMMON PROBLEMS


1. Bad Transformer

Most models use a Single Primary (120V ac) Dual Secondary (40V ac / 18V ac) power transformer. The secondary current rating should be at least 1.5A (3A is even better for moving large antennas).

The symptoms of a faulty transformer include:

-unit turns on but cannot move antenna in either direction (faulty 40V ac secondary)
-unit turns on but struggles to move antenna in one or both directions (faulty 40V ac secondary)
-unit does not turn on (faulty 18V ac secondary or transformer is completely dead)


To determine if you have a faulty transformer, unplug the white transformer power connector and measure the AC voltages with a meter. Between the two black wires you should measure around 40V ac. Between the two red wires you should measure around 18V ac. The 40V ac is used to drive the actuator while the 18V ac is used to power the electronics.

If there is no voltage on one of the secondaries under no load, then you definitely have a faulty transformer and you need to purchase a new transformer. Sourcing an exact transformer replacement is not easy, but Hammond Mfg has some close matches:

https://www.hammfg.com/electronics/transformers/power

Now plug the white connector into the board and take the same measurements under load. If you can measure the ac voltages already mentioned, then your transformer is definitely working and does not need to be replaced. The problem is with one of the components on the board.


2. Bad Voltage Regulators

If the transformer is good but the unit does not turn on, the problem is likely one of the voltage regulators. This is a very common problem. Use your volt meter to measure the DC voltages across the legs of the voltage regulators as shown in the diagrams. Keep in mind that the 12V regulator feeds the 5V regulator, so if the 12V regulator has failed, the 5V regulator will appear dead also, but may actually be fine. So if the voltages are wrong, you need to remove the regulators from the board and test them separately using a power supply.

You can purchase new regulators here:

12V dc regulator


5V dc Regulator

3. Bad Electrolytic (Bi-polar) Capacitors

Some of the power capacitors can be blown. They are shown in the diagram. Remove them and measure the capacitance and check for shorts. The purpose of the capacitors is to smooth out the voltages coming from the rectifiers. Replacements can be purchased at Mouser or DigiKey. Make sure they are rated for 40V dc or 18V dc depending on the applied voltages.

4. Bad Rectifiers

The two rectifiers are shown in the diagram. Use your meter to check the four diodes in each rectifier. Also, check the fuse which is right beside them. If the small rectifier is working, it will put out 18V dc on those blue transistors (see diagram). If the larg rectifier is working, it will be feeding 18V dc to the 12V regulator (see diagram).

5. Bad Semiconductors

If all the tests above check out and you are still scratching your head, the problem may be with one of the semiconductors. Remove the large atmel chip in the center and check for 5V dc power on pin 20. If this chip is bad, it will short that power pin when you put it back. To test the other semiconductors, you need to cut the track going to the Vdd of the chip. Check the datasheet for the chip. Measure the Vdd voltage before cutting the track. If it measures within specifications, then it is okay. If it looks like it is shorted, you need to cut the track and see if power is being fed. Replace any damaged chips.

6. Bad Resistors

A visual inspection will suffice. Check for any burned out or 'smoked' resistors. Replace if necessary with one rated for a higher power loads.

7. Bad LEDs or Display

Use your meter to check the LED diodes at the front of the unit. Lift the Vdd leg of the segment display and check for power.

8. Sticky Relay

There are two relays in the positioner. They are mechanical switches. Either one or the other opens when driving the antenna east or west. Sometimes the mechanical switch inside the relay will become "sticky" and won't open to power the actuator and drive the antenna. Instead of the usual loud "click", you will hear a very soft sound of the mechanical switch trying to unstick and get the dreaded "ERR" error. You need to remove the relay, open it if possible, clean it and re-solder to the board. Replacement relays are available for purchase. Make sure you purchase one that is rated for 40V dc and at least several amps.

9. Printed Circuit Board

Inspect the underside of the printed circuit board for damage or cold solder connections. If any components appear loose, re-solder as required.


If all the troubleshooting discussed fails to fix the problem it is probably time to just buy a new dish positioner if you can find one!


Sursa

[dingo31]

Unde as putea gasi sau cine ar putea confectiona un trepied solid, capabil sa suporte o antena de 1.2m-1.5m pe care sa pun si un motor H-H? Transport+ manopera+taxe+bonus in cont beneficiar