Power supply 12V-5A.

In my case, this PSU is in used condition. Most PSUs make a straight bevel and in some cases this creates problems for the output wires inside the case. Today we will look at the junior PSU 12V / 5A, model LSE9901B1260. Just in case, we call the diode assembly, in my case, everything is in order with it. Even in the store I looked that the PSU was on screws, but I forgot it at home, my head was already busy with the New Year. DATASHIT specifically for this assembly, immediately, did not find it. Our PSU is on two screws under the rubber bands, a couple of latches from the entrance side. Made for extra security. On the radiator we already have two STPS20H100CT diode assemblies (for 20A / 100V each, metal case) – DATASHIT. This review may contain technical and grammatical errors. Optocoupler 817C. They are quite simply converted to 12V. Let’s move on to the hero of the review. At first it seemed that the output wires were installed on the connector. Especially, for sporting interest, I took all VeriFone 9V-4A models.
We unstick from the transformer and unscrew the third, additional, radiator. On the first PSU, there is no such ring on the wires.

On the same evening, I opened the case of the PSU. On Thursday, I decided to take a walk to the store and, if possible, take a couple more power supplies. The store also has a 12V-5A power supply unit with cables. Immediately after the New Year there was no health and mood for the soldering iron. They have a relatively high price and if there are branded used VeriFone 9V-4A power supplies in the store, at a price of 199 rubles (less than $ 3), it did not make much sense to take a 12V power supply. A thermal pad is glued to the transformer. Immediately solder the radiator with the diode assembly. After opening the case, it became clear that a soldering iron was needed for further disassembly. Over time, the revision of the board changed. This is in the subject when they sometimes say that it is not necessary to disassemble and the analysis has already been in such and such a review for a long time. On the front side there is an insulating gasket with a wide copper tape. There are 16AWG cables from these VeriFone 9V-4A PSUs at home. A ferrite ring was installed on the wires, right inside the case. The copper tail is riveted to the third radiator and the tail itself is glued to the transformer, to the white sealant. The pins are isolated for safety. A little background – on the evening of December 30, I went to our city RADIO STORE. And to me, on the contrary, transistors from Toshiba very often come across in these used PSUs (in the same VeriFone 9V-4A PSUs). They agreed on the price as for a used PSU VeriFone 9V-4A (199 rubles).
Since this is the case and one new PSU was faulty, then I began further analysis from it. But below the label there is a marking of another revision. Unsolder all pins and wires.
It is sad that their output cables are bitten off and it is very likely that when replacing equipment, they were simply bitten off and even too lazy to pull them out of the connectors. I ordered some small things and chose two PSUs from the package – one for 12V / 6.67A and the other for 12V / 5A. Number 6 – X-capacitor. Otherwise, there will be problems at home, there is nowhere to put them. I was not very surprised, I saw this in the VeriFone 9V-4A PSU.
The numbers 1 and 2 are common mode chokes. Diode assembly F30JC10, my favorite (by me) ferrite beads are installed on the extreme terminals. There are very big people here in terms of BP, but I will tell from my own, small and amateur bell tower. Then we solder the remains of the output wires and check if the short circuit is gone or not. The result – a large number of accumulated at home, I had to quickly distribute to friends and in the yard. Looked at available details. The inner world is changing, while for Chinese products it can change dramatically and at any moment. In short, I went to the store, said that the PSU was in order and it was not garbage at all. There is a Y-capacitor, it is also in heat shrink. A small, very amateur review of a good 12V-5A PSU. YXG Series – DATASHIT. Although there were doubts, but not about the BP. We decided that since the New Year and I often go to the store, the BP is a gift. With the old capacitor, this ring did not fit. It was only in the fall that I raked a little at home with a used VeriFone 9V-4A PSU. Remove the textolite overlay from the bottom of the board and peel off the shielding gasket. But these output cables are indifferent to me, I have at home both home-made cables and factory cables up to 16AWG (2×1.31mm2), with ferrite filters on them. We see a large, standard "computer" connector, a common mode choke and an X-capacitor. Let’s run through the elements on the front side of the board (at the input). Number 3 – SCK033 thermistor. I chose two more of these PSUs 12V-5A in the package. Number 5 – a place for a varistor (10471). Power 1 W. The wires are inserted into a separating plastic case, but the wires themselves were soldered to the board. https://jiji.com.et/388-camera-accessories/digital We look at the power supply board, after parsing the case. Temporarily postponed BP. Near the current resistor in the primary circuit, the resistance is 0.36 ohms. You can safely take this home. Marking from below, well sealed on both sides, I decided not to touch it. In the evening, I dismantled the case from a non-working PSU. I put two boards for a visual comparison. PSU size (body) – 110x64x33mm. at BP,
at the output, rounding is done and this is very correct. And there were a lot of them in boxes in the store.
Let’s try to understand the meaning of the changes on the board. On the labels you can see what was the connector on the native cable and its pinout. The new PSU already has one diode assembly. A red disc capacitor 222/1kV is installed in parallel. I have no questions, normal solution. At the same time, the model on the label remained the same. But there was a hitch with the BP, there was no price for them. Now it is clear why they changed the diameter of one capacitor at the output (from 12.5mm to 10mm).
View from the end, at the entrance. The second large PSU has also already looked at home and in the second photo it is already soldered with the remnants of the wires and after the revision. Kirich in a recent review said that Toshiba transistors have not been seen for a long time. The only question is how effective the yellow transformer tape is as a thermal interface. I had to quickly change the capacitor, but they just didn’t find the right Rubicon and installed an LTEC 16V / 1000uF capacitor, a good LZG series – DATASHIT. I slowed down with this PSU, opened the case using the “big knife hammer” method. Old revision on the left, new revision on the right. In this case, the base of the additional third radiator interferes. There I saw a package with a used 12V PSU. And this PSU is already a little different from the previous one. Small capacitor for PWM power 50V/10uF. On the top cover there is a hole for the LED. In appearance and visually accessible details, for myself, I made certain conclusions about the BP. The photo is enlarged.
The shielding gasket has changed. Number 4 – round fuse 3.15A. Next is a good filtering inductor in heat shrink and a small capacitor (25V/100uF). One diode assembly is installed, but already at 100V / 30A. On the reverse side of the board there is a textolite overlay to which the upper shielding gasket is glued and two contacts are soldered. When checking, in the store, the LED on one PSU did not light up, the PSU turned out to be a gift. A couple of VeriFone models have thick long cables at the output. The entrance part has changed a little. There are two Rubycon 25V/1000uF (12.5/20mm) capacitors at the output. Number 7 (under white sealant) — diode bridge 2KBP06M (2A/600V). I read several times in the comments when people said that Schottky diodes are installed with almost no current margin.

Power supply 12V-5A.


They just asked, on the next visit to the store, to say it’s trash or normal PSUs. And I have not seen these PSUs in the store yet. The multimeter showed 108-109uF, size 18/31mm. One contact is from the minus at the output, the other from the ground contact of the 230V input connector. This is the topic of Schottky diodes in the PSU. We preliminarily inspect the board – we have two main radiators and a third radiator with a tail has been added between them. Changed capacitors (diameters) – now one per
12.5/20mm and another at 10/20mm. After soldering the wires, the short circuit at the output disappeared. There was already health for the soldering iron. I have the opposite observation – in factory power supplies, these Schottky diodes are installed with a large current margin. Key transistor K2843 (600V / 10A, Rds (on) – 0.75 Ohm) – DATASHIT. Nippon Chemi-Con high voltage capacitor.