GS 8300 is the first receiver in the line of receivers for Tricolor TV that supports the MPEG-4 compression format and the DVB-S2 broadcast standard. This is the first receiver that receives more than 150 channels. We can say that it began a new era of receivers for receiving Tricolor TV. It's funny, but it started, like many receivers for Tricolor TV, with problems of a different nature. Either the receiver took a long time to activate, or it didn’t see the card...

But. As a result, the stability of the receiver was improved with new firmware. This material is not about the problems of the GS 8300 receiver, but about what it consists of. Let's consider.

We can say that with this receiver the manufacturer got his feet wet in the production of MPEG-4 DVB-S2 operator receivers. And judging by the number of GS 8300 receivers in the hands of users, this experiment was a success. The GS 8300 receiver is equipped with a removable access card, but the GS 8300M receiver does not have an access card - the chip is hardwired into the receiver itself.

The receiver is built on a processor STi5119, FLASH memory volume 4 MB, random access memory only 16 MB - a ridiculous amount compared to the GS 9303 or GS U510. But the class of the receiver is different, because the 8XXX series does not support channels in HD format.

So. Below is a photo of the GS 8300 receiver motherboard. Both a general plan and close-ups of individual components. Maybe someone will find these photos useful.

GS 8300 - general view of the board

And now different nodes close-up

And in the photo below is the power supply capacitor. The power supply in the photo is no longer original, but after replacement. And the capacitor used in it is of a higher quality than in the original power supply. Although the ratings of the capacitor itself are the same.

And here's another element. You can unsubscribe in the comments about its purpose. I haven’t delved into this issue myself.

This is how I got a quick photo review of the receiver for Tricolor TV - GS 8300 today. That's all for now.

The power supply of Ferex R&D FP09T001 Rev.2 receivers is assembled according to the circuit of a pulse flyback voltage converter shown in Fig. 12. Input AC mains voltage 190…240 V with a frequency of 50 or 60 Hz through fuse link F1, noise suppression filter C1LF1, which prevents interference from the source from entering the network, current-limiting resistor RT1 and diode bridge D1-D4 goes to smoothing capacitor C5.

GS-8300 satellite receiver power supply circuit

Series resistor RT1 limits the inrush current through the diode bridge D1-D4 while charging capacitor C5. Varistor RV1 protects the source from overvoltage. When the supply voltage exceeds the permissible value, the resistance of the varistor decreases, the current flowing through it increases and the fuse-link F1 burns out.

The rectified DC voltage passes through the control unit to the primary winding of transformer T1. It is switched by a powerful field-effect transistor Q1, controlled by a PHI controller U5. The energy accumulated in the transformer is transferred to the secondary windings and rectified by diodes D5. D7-D9.

To start the power supply, when connected to the network, a rectified voltage is used, coming through current-limiting resistors R4, R5 to pin 5 of the U5 microcircuit. After startup, voltage appears on the secondary windings of transformer T1, and microcircuit U5 is supplied with voltage rectified by diode D5 through current-limiting resistor R19.

Stabilization of the output voltages of the power supply is ensured by elements U2 (optocoupler, galvanically decoupling the primary and secondary circuits of the source) and U3 (voltage stabilizer). The rated values ​​of the output voltages are set by the divider R25R26. When they increase during operation, the transistor in the optocoupler U2 opens, and the PHI controller U5 reduces the duration of the pulses that open transistor Q1.

As a result, the energy transferred to the secondary circuits is reduced and, consequently, the output voltages are reduced. On powerful field effect transistor Q2 and microcircuit U4 assemble a linear voltage regulator +5 V. Its rated output voltage is set by the divider R35R38. Appearance power supply is shown in Fig. 13.

Repair of tricolor GS8300 receiver. Reworking the power supply. Typical fault The problem with the Tricolor GS8300 receiver is very common and involves a failure of the power supply. Repairing this power supply is sometimes quite complicated due to the fact that there is no original PWM controller chip. But it can be converted to another available 5L0380 chip with changes in the installation of the power supply. Release partner TAGGSM.RU http://goo.gl/rUoVNb TexRemont - a simple solution to computer problems Many users, if their computer, laptop or LCD TV breaks down, immediately turn to specialists who can repair it all. On the one hand, this is correct, but on the other hand, the cost of even the simplest repair, such as replacing a BIOS battery, will not be minimal. Therefore, for users who are not afraid to pick up a soldering iron and a screwdriver, a special channel was created https://www.youtube.com/user/texremont1. If a laptop or tablet malfunctions, not everyone knows the intricacies of not only repairs and the procedure for disassembling devices. On the TexRemont channel you can watch hundreds of videos devoted to this issue. They contain video instructions in which professionals show in detail the features of working with a wide variety of laptop models, video cards and motherboards various manufacturers. At the same time, the main problems and ways to solve them that may arise during operation are described. Detailed description disassemblies of laptops and tablets of various brands from various manufacturers can also be viewed without any problems. Not every person can boast of that. That he knows how to work with such a person enough simple device, like a soldering iron, especially Soldering Station. Features of using modern infrared stations are described on the TexRemont channel, and you can always watch detailed video tutorials of work related to such an important feature as chip reballing, which is the basis of modern precision electronics. Repairing computers and their components is a rather complex and labor-intensive process that requires skills and experience. The TexRemont channel describes in detail the basic actions in situations when a computer malfunctions at the hardware level. The channel describes in detail the features of upgrading computers, connecting various devices and gadgets. Hundreds of videos will help a novice electronics engineer choose the right equipment for repairing computer and digital equipment and teach how to work with it. Detailed description modern technologies soldering and installation of equipment will be taught to anyone who wants to independently repair laptops and computers. Our affiliate program Youpartnerwsp

October 2012. Within a week they brought 15 GS-8300s with dead power supplies, including blown tracks, cracked PCB and burnt SMD resistors.

hover your mouse over the image to enlarge it

How everything happened is clear - the electrolytic or oxide capacitor standing at the input (C5) dries out and gives pulsations, but so far everything is working. The transistor of the primary winding of the transformer (Q1) overheats, the SMD parts around it burn out, the board tracks crack and the power supply becomes faulty.

The original power supplies ran out a long time ago, but the GS-8300 receivers kept coming and going. Of course, repairs were possible by fusing tracks, installing jumpers, soldering parts - in short, it was possible to restore the power supply from the ashes and at the same time it would work properly, although the work did not look entirely aesthetically pleasing and it was better for the client not to see the result of the master’s actions. And, of course, it took a lot of time to repair each block.

Therefore, I went the other way - I took it and adapted it for the GS-8300 receiver, but I’ll just make a reservation that there are several models of power supplies for the DRE-5000, the one on the left is suitable in the photo below - it is also the most common (the right one in the image does not fit in height )

Pinout of DRE-500 and GS-8300 connectors

No. DRE-5000 GS-8300

So, what needs to be changed in the block - remove the 8th and 10th wires from the block and cut them off from the power supply itself (we don’t throw away one of them, it will be useful to us later), cut off the place of the block for the 10th wire with a knife, total our connector has become 9-pin, we move the 7th wire into socket 8, we plug the cut wire into socket 7 and connect it by soldering to wire 6. In total, we get a GS-8300 connector, although instead of 24V we will have 22V, but this insignificant and tested over the years - does not affect the result.

Next is the mechanical adjustment of the power supply - we use pliers to break out the space for the com-port socket, and with the same tool we reduce the length of the block by 3-5 mm. And finally we move capacitor C1, making room for the power switch

Connect the network cable. We insert the block, placing an insulator - plastic from a bottle, perhaps, fasten it with one screw, the second attachment point is a groove on the body. ready, just close the lid

About 300 receivers were repaired in this way, in two years one return was knocked out C17