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TYPICAL TROUBLESHOOTING OF VIDEO LAMPS "AIWA"
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1). AIWA HV-E101DK. The color disappeared in PAL, SECAM is. The chrominance processor is implemented on the LA7331 chip, one of the reasons may be a bad quartz at 4.43 Mhz. Changed and everything fell into place. |
2). AIWA. In the LPM of many video recorders of different models (Funai, Aiva, Daewoo, etc.), a loading engine is used, which is structurally installed from above and through the passive and the worm transfers rotation to the other LPM nodes. The engine is usually mounted on a flange and fixed with two screws. When the wear of the belt is observed, unstable operation of loading and unloading the cassette, stretching the tape, etc. Often, to replace the pass, it is required to disassemble the entire LPM. Moreover, often there is no possibility to pick up the right pass and the quality of new passports leaves much to be desired. Very often you can proceed as follows. Remove the filling engine and fasten it to one screw, attach the belt to the pulley and rotate the engine to pull the passiper to the required value, then tighten the bolt. Further, as the wearer wears off, this technique can be repeated. The motor becomes higher, but the VCR cover normally closes freely. |
3). AIWA CX8. From time to time, the image disappears during playback. Sometimes disappears altogether. At the accelerated viewing all is normal. Reason: contamination of the shaft and pinch roller. |
4). AIWA. Video tape recorders. ~ 20 hours / day 3 years even with a new head there is a periodic disappearance of a group of rows on a known normal copy - the cause is the rubbing of the ribbon along which it slides (it becomes not rectangular, but smoothed and it travels there for a few dozen). It is treated with a complete replacement of the base of BVH. -SD mechanism. Play and play. Normally, fast rewind is turned on neither to the left nor to the right, it slowly pulls the tape, approximately as if it were accelerated viewing. Reason: because of cheap tapes with increased flexibility, the surface of the BVG wears out and rubs very hard against the tape (there is no air gap), With the corresponding reaction of the driving engine. It is treated by replacing HBV. -to SD and SD mechanism. Periodic appearance of chaotic dots 1-2 mm with trays from them to the left 5-10 mm. The reason for the clogging of the current collector with the BVG. It is treated either by removing it, or by completely removing the old lubricant and replacing it with a new one or without any lubrication (if there is no special lubricant), in mechanics with an engine of BVG from above, the current collector is located under the BHG in the central hole. It is treated by grounding the bolt that secures the motor to the UV screen. These are the "secrets", if they are interested in anyone .. |
5). The video-studio AIWA 14` (Otake, Akai, Orion). When trying to turn on the tape, the tape was first fed, and then without good reason, it was thrown away .. After a long torture of checking the work of the whole mechanics and the electrical part, there was a defect in the contacts of the system gear. It just happened in a separate part, Touched one more current-carrying track that corresponded to the reproduction. + Rewind .. As the clinical processor, he did not know what operation to perform .. |
6). Monoblock AIWA VX-T1400. Vidak in play mode of minutes after 3-5 turns on the monoblock starts to pull the jerks, the screen has solid horizontal stripes. If you touch the C5 on the CAPSTAN MOTORA F2QTB02 card on the M56730ASP IMS all works clearly, remove the hand, pulls again. By a detailed analysis of all incoming voltages on the CAPSTAN, I noticed the presence of a variable component of only 0.05 V at 1 pin (VCC 5V) of the CP2003 CAPSTAN connector. This was enough for the engine to go astray. During the search, the 100μF conder was placed between contacts 1 (VCC 5V) and 2 (GND) of the CP2003 connector of the motor, the defect was almost gone, but the sound and the image were still slightly shaking. The reason for the defect was the capacitor C523 of the power supply unit, which is located on the board close to the radiator of the stabilizer IC502 (VCC 5V coming later on CAPSTAN, as well as to the servo processor), and this explains the appearance of the defect 3-5 min after turning on the TV, the radiator heats the capacitor case and Its characteristics deteriorate. Replacing the C523 completely eliminated the defect, I placed it on long legs farther from the radiator. |
7). VIDEO RECORDER. VIDEO RECORDER I do not specifically indicate the brand of the device because this defect can occur in any kind. The defect is as follows: When you turn on the cassette for playback several times, you can observe the following picture. The image on the TV can be normal, it can be seen only half the image, and maybe nothing at all is unseen, one snow. The defect is in the capstan motor, which moves the film. There is one single electrolytic capacity here and it gives this defect. It is necessary to change it. |
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