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When the machine is turned on and the [Test Key] is pressed, there is no reaction on the screen. Check the component side of the mahjong wiring from pin 7 to 1010P521 optocoupler pin 2. If P521 is damaged when pressing the [Test Key], replace it, and the fault will be resolved. Afterward, when the user presses the [Test Key], a switch test diagram will appear on the screen, allowing the user to perform function settings by toggling the switches.
After turning on the machine and pressing the [Account Check Key], there is no reaction on the screen. Check the solder side of the mahjong wiring from pin 7 to 1013P521 optocoupler pin 2. When pressing the [Account Check Key], if there is no change in voltage at pin 4 of P5215, it indicates that P521 is faulty. Replace it, and the fault will be resolved. Afterward, when the user presses the [Account Check Key], an account check menu will appear on the screen. The user can query the necessary records according to the menu and adjust the main and continuation game rates.
After turning on the machine, everything appears normal, but after the 'Dragon Tiger Rivalry' text finishes playing automatically, the light board appears. At this point, the demonstration music remains normal. Removing the IGS025 square package from the rear department and restarting the machine still results in the same fault, indicating that the IGS025 square package operates normally upon startup.
After turning on the machine, everything appears normal, but after inserting coins to start, within a few minutes, irregular mahjong pieces fly chaotically across the screen. Replacing the IGS025 square package resolves the fault.
Upon startup, irregular mahjong pieces fly chaotically across the screen. Removing the IGS025 and restarting the machine still results in irregular mahjong pieces appearing, indicating that this fault is unrelated to the IGS025. Testing reveals abnormal data signals for U9U106264. Replacing U9U10 resolves the fault.
After turning on the machine, the image's moving scenes and background are completely distorted. Testing reveals abnormal data signals for U3362256. Replacing it with a microcomputer-tested 62256 that has no issues, but when the power voltage exceeds +5V, irregular small mahjong dots interfere with the library image on the screen. When the voltage is less than +5V, the screen image is good. Later, replacing another 62256 shows that the image is good when the power voltage is between +4.8V and +5.6V. This demonstrates that although the 62256 passes the microcomputer test, its actual performance must also be evaluated. (Oriental Pearl Pinball Machine)
After turning on the machine, the image board is distorted, but the mahjong pieces are clearly visible; only the background is chaotic. Testing reveals abnormal data signals for U3362256. Replacing it resolves the fault.
After turning on the machine, testing reveals abnormal data signals for U3362256. Testing with a microcomputer shows it is damaged. Replacing U336 resolves the fault.
After turning on the machine, the background is OK, but the moving mahjong pieces are unclear, resembling a layer of sandpaper covering them in a fabric-like pattern. When touching pin 157-209 of the large IGS031 square package U24 with a finger, the mahjong pieces become clear. Using a magnifying glass to carefully inspect, it is found that pin 163 of the large IGS031 square package U24 is poorly soldered. After resoldering it, turning on the machine shows everything is normal.
Guangzhou Qile Electronics Game Machine Sales.