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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING PS one: operation and repair. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Телевидение The video game console "PS one" by the Japanese company Sony is the result of the development of a series of consoles "PlayStation" [1]. The small weight and the sizes leave an imprint on features of its operation. Compared to previously released models, "PS one" is more likely to suffer from accidental falls from a height, you can literally sit on it without noticing on a chair or on a sofa. As a result, it is necessary to seal cracks in the fragile body of the attachment more often. To protect "PS one" and its accessories (joysticks, memory cards) from premature failure, make it a rule not to dock or undock the connectors when the green indicator on the front panel of the set-top box is lit. And if you really had to do this without turning off the power, apply force strictly perpendicular to the plane of the set-top box. This ensures that the longer than the rest pins of the power circuits and the common wire in the connector will be connected first or disconnected last. Strongly heated elements in the "PS one" is not and it can be left on for a long time. The network adapter, which continues to work even after the set-top box itself is turned off, is designed for long-term idle operation. Nevertheless, it is better not to leave it unattended and unplug it from the wall outlet at night or when leaving home. The case of the video adapter's network adapter is plastic and ... non-separable to resist the age-old childish desire to look, "what's inside?". By the way, in various household equipment, a similar design is increasingly being used. To gain access to the adapter board, carefully cut its case with a thin hacksaw from the side around the perimeter. After completing the repair, glue the body halves or simply wrap them with several layers of adhesive tape, preferably transparent. In the network adapter, the 1 A fusible link F2 most often burns out ([2], Fig. 5). Often this is a consequence of a breakdown of a powerful field-effect transistor Q1, which is easy to replace with one of the similar switching power supplies for TVs (FS5TM, 2SK1117, 2SK2666, 2SC2128, 2SC2125, 2SC2718). The transistor must be rated for a voltage of more than 600 V and a forward current of at least 5 A. The transistors used as Q2, Q3, Q51 are produced by many Western and Asian firms. If necessary, they are replaced by any low-power ones of the appropriate structure (pnp or npn) and sizes, for example, the KT3129, KT3130, KT315, KT361 series. The closest in parameters to the one installed in the adapter (IC1 chip) is the NCP1200D60R2 SHI controller from ON Semiconductor. Optocoupler IC2 - any with an isolation voltage of more than 500 V (NEC2561, TLP621, TLP521, PC817A, "3171", "3131"). Diodes D3, D4 - 1 N4148 or series KD521, KD522, KD503. In case of complex malfunctions, it is advisable to refuse to repair the adapter and replace it with any, even a home-made and not necessarily a switching power supply with an output voltage of 7,4 ... 8 V at a load current of 1,5 ... 2 A. Less voltage is not enough for stable operation of the set-top box, with more, some of its elements will heat up too much: the integral stabilizer IC601, the Q602 transistor ([2], Fig. 4), the IC722 microcircuit (Fig. 3 ibid.). The appearance of the processor board is shown in fig. one.
All the important elements are marked here. If there are no obviously damaged parts, for example, blackened resistors, on the board, regardless of the nature of the manifestation of the defect, all fuse-links in the design for surface mounting are subject to priority checks (Table 1). In good condition, the resistance of any of them does not exceed several tens of milliohms, a larger value indicates partial or complete operation (burnout).
If the failure was the result of a surge in the supply voltage or an accidental short circuit in the joystick, replacing the burnt insert with a similar one or simply with a piece of wire with a diameter of 0,1 mm usually completely restores the operability of the IVP. Nevertheless, after repair, it is recommended to observe for some time whether the malfunction recurs and whether there are unusually hot parts on the board. Quite often, protective zener diodes installed in the input and output circuits of the set-top box at the CN502 connectors fail (their failure leads to a lack of image and sound) or CN101, CN102 (joysticks and memory cards do not work). For example, if the stabilization voltage of the zener diode D104 drops to 1,8 V n as a result of a malfunction, Some joysticks continued to work, while others did not. Zener diodes can be replaced with conventional KS147...KS168 with any letter indices, although it is better to use special limiting diodes [3]. Less often, breaks in the windings of inductors and noise suppression filters occur, which should also be checked with an ohmmeter. Mechanical damage to the processor board and its elements is not typical for "PS one", although there have been cases of short-term power failure due to poor contact in the J001 connector. Sometimes the prefix cannot be turned on because the contacts of the S001 switch are oxidized or burnt. Greater reliability of the switch can be achieved by connecting a free group of its contacts in parallel with the operating one. A break in the hinged conductor going to the IC801 chip once led to the fact that when any game disc was installed in the console, a music menu appeared on the screen. Table 2 will help you choose a replacement for failed transistors (including those installed in the network adapter). XNUMX. It contains not only the main parameters of each transistor, but also the marking applied to its case, without knowing which, it is quite difficult to "recognize" the device.
Video set-top box resistors are marked, as a rule, in a standard way. Of the three or four digits of the code, the one on the far right is the exponent of the number 10, by which the number indicated by the previous two or three digits should be multiplied. Examples: 271 - 27 101 = 270 ohms; 104- 10 104 \u100d XNUMX kOhm; 3922 - 392 102 = 39,2 kOhm. However, Bourns resistors are also installed with a tolerance of ± 1% from the nominal value and alphanumeric marking. To decipher the digital part of the code applied to a similar resistor, refer to Table. 3. The number found in it is multiplied by the coefficient indicated by the letter: S - 0,01, R - 0,1, A - 1, B - 10, C - 100, D - 1000, E - 10000, F - 100000. The result obtained is the resistance of the resistor in ohms. For example, 12C - 13 kOhm, 18V - 1,5 kOhm.
The weak point of all "PlayStation" models, including "PS one", is the mechanics of the CD-ROM drive. Long-term daily operation of the attachment leads, as a rule, to the backlash of the rotor of the engine that rotates the disk. Outwardly, the defect manifests itself in the fact that in the normal (horizontal) position of the IVP case, game programs begin to work only after repeated "fidgeting" of the laser head over the disk. By tilting the case by 10...45°, the reliability of data entry can be restored. Sometimes the angle required for this stabilizes over time, but more often it gradually increases. Having found such a defect, first of all make sure that it is in the motor that rotates the disk, and not, for example, in the drive of the optical head carriage. The worm gear of the drive is worn out, sometimes its action is hampered by accumulated dirt. Wash all transmission parts with pure ethyl alcohol and lubricate with vaseline or a special non-thickening lubricant for plastic parts (MOLITUBE, LUBRIPLATE, etc.). To eliminate the "jerks" of the carriage, sometimes it is enough to slightly shift the motor that rotates the worm, or to put a drop of lubricating oil on its rotor. With a working drive, the movement of the carriage should not be accompanied by crackling and other sounds. Unreliable data reading may be due to contamination of the optical head lens. This is often caused by the deposition of tar from tobacco smoke on it. The lens surface is blown with dust-free compressed air from a special, similar to an aerosol can, or gently wiped with a clean, dry cotton cloth. It is permissible to replace the lens with a similar diameter of 5 mm from a computer CD-ROM drive. Sometimes it is useful to increase the power emitted by the laser diode by reducing the resistance of the trimming resistor located on the flexible cable of the optical head by 10 ... 20%. Before adjusting, measure the set resistance value (approximately 1,2 kΩ) so that in case of failure, return everything back. If no improvement has come as a result of the measures taken, the most reliable and fastest way to repair is to replace the entire CD-ROM drive assembly with a known good one. In addition to the regular one, you can use the KSM-440ACM drive from the set-top boxes of the SCPH-series100X. Drives KSM-440ADM, KSM-440AEM differ from other models of "PlayStation" in the length of the flexible cable and design, although they are electrically compatible with "PS one". Please note that the cost of this operation will be 35...50% of the total cost of "PS one". A cheaper option is to replace only the CD-ROM drive motor. Suitable RF-300PA-11400 D / V 5.9 or RF-300F-11420 D / V 5.9 from Mabuchi. In a hopeless situation, you can go for an independent engine repair. It, together with a plastic nozzle 2, is schematically shown in Fig. 2. The latter must be removed, having previously measured and recorded the width of the gap S between it and the engine housing 1. This will allow you to return the part exactly to its original place. Please note that the assembly is not designed for disassembly and reassembly, the operation is far from always successful and requires certain skills.
The nozzle is very fragile and is tightly seated on shaft 3. When removing it, it must not be skewed, which can lead to irreversible consequences: bending of the shaft, cracks in the nozzle or a "broken" mounting hole, which does not allow further fixing it on the shaft. It is best to make a special puller - a lever with two blades that are inserted into the gap. With its help, the nozzle is gently shifted, applying efforts evenly from all sides. This operation can be performed in another way, for example, with the help of several steel plates inserted into the gap from different sides. The main thing is to act carefully and without haste. Rinse the entire surface of the shaft freed from the nozzle with ethyl alcohol. Then, wearing protective gloves, with a drop of cyacrine (this strong, quick-drying glue is sold under the trademarks "Instant Super Glue", "Second"), fix the shaft in the plain bearing 4, eliminating play. After a few minutes required for the glue to dry, the nozzle 2 can be installed on the shaft 3, always making sure that the width of the gap S is exactly equal to that measured before the start of the repair. If the nozzle slips on the shaft, try to fix it with the same glue. After a day, you can begin to "train" the engine with a voltage increased to 8 ... 9 V. At the first start-up, the shaft will accelerate slowly, as if with difficulty. After a few "training" normal rotation will be restored. Cyacrine is able to firmly glue biological tissues, so it should be used with caution, avoiding contact with the skin. Literature
Author: S.Ryumik, Chernihiv, Ukraine
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Comments on the article: Vladimir The worm gear gears broke, I ordered a new laser unit for aliexpress. I installed it and when the set-top box is turned on, it makes a sound like when the motor is running (there is a feeling that the motor is spinning), and it does not stop until you turn off the power, but the landing slot for the disk does not spin. As if the spindle with the rotor lost contact. Please tell me how to solve the problem.
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