9/15/2023 0 Comments Zaccaria pinball first power upPossible to run the game entirely on the bench. Playing this loop until it is reset or power cycled.īy interconnecting the boards with their ribbon cables, it is Will cause the board to being a sound test loop. SW1 is connected to the processor interrupt line (INT) and turning it on If the processor and ROM are good, you should also be able to use theīuilt in self test loop to have the board play sounds continuously. Prior to it reaching the amplifier stage. Use a 'scope to probe R24 (1B1146) or R52 (1B1146/2) for the sound signal If no sound is played, the volume pot or the TDA1010 amplifier could be bad. Then load 0xFF on the Data lines andĬhange Select from High to Low again to clear the latch and prepare for the next Last,Ĭhange the Select line from High to Low. To command the board to play a sound, load 0x06 on the Address lines (A0 High,Ī1 Low, A2 Low), then load a data value like 0x05 or 0x06 on the Data lines. Power up the board and check the two pins of the crystal with a 'scope or a logic On the board, and need to be pulled Low by the test jig. The Address, Select, and Data lines are all pulled High by pullup resistors While CN2 supplies the address, select, and data signals from the CPU: CN1 supplies power to the board and has the speaker connection, Start by constructing a simple test jig to connect to the CN1 and CN2Ĭonnectors. The game CPU to run the sound board independantly for bench testing and Makes it possible to simulate the commands that would normally be sent by That runs independantly from the main game CPU, but under its control. Play a backround sound used on Locomotion. The only difference is that the 1B1146/2 has the ability to These two boards are functionally very similar, and the same methods Likely similar to the 1B1146 below, but has not been tested yet. Or a test jig, can be used to toggle the input connector pins to test the workings.įor the 1B1125 board, Leon has a test jig and procedure on Indicates a problem, likely a shorted transistor or SCR. Probe can be used on the lamp and solenoid outputs. Voltages on the correct pins.After powering up the board, a logic As with the CPU, use to verify your power supply's Use one of the floppy drive connections to supply Gnd (black wire) to CN12 The logic probe can alsoīe applied to the switch matrix on CN8 and CN9 to see if the switch The logic probe to see if it is running correctly. Running, the test points can be probed with Keeping the reset section from working, which could be a failure of IC41 (a 3081 that is also part of If the board boots, then there is a problem that is TP6, try touching a +5V jumper briefly to TP6. If not, or if no signal change is seen at RESET line goes LOW-HIGH-LOW and should be running now. Pulse HIGH when power is applied, after which it goes back to LOW. This signal is normally LOW, and there will be a brief There is a short delay (less than one second), then the board should boot up.įor testing, put a logic probe on TP6 (RESET). Power the CPU board so I can connect a display and see what is going on. For this reason, I normally get the Power Supply board working first, then use that to Game ROMs, and no display, the various test points are the only indication that the board is doingĪnything. Primarily useful when working with Leon's test ROM and his associated test indication LED. There is no on-board indication that the CPU is running when the power is turned on. Test points, if you are using aligator or spring clips to supply power and Gnd connections, it is oftenĮasier to connect them to the test points than to the connector pins. Since these games have an unusual connector, and decent sized loops on the See as a connector reference to verify your power supply's voltages against. In case it is not using the "standard" wire colours. Check your power supply for these voltages, just +12V (usually a yellow wire) to CN7 pin 4 (or TP2),Īnd +5V (usually a red wire) to pin 5 (or TP3). 5V (usually a white wire, sometimes yellow) to CN7 pin 6 (or TP5), Use one of the motherboard connections to supply Gnd (usually a black wire) to CN7 pin 2 (or TP4), These does make it a bit more difficult to do this than on some other games. has several documents on it on doing this. The displays need high voltage (approximately 170VDC), but the rest of the boards only need +5V, -5V, +12V, and Ground. To make it easier to work on these boards on the workbench, instead of having to put them in a game to test them, it is possible to use a standard PC power supply and a few test jigs to test and diagnose them. Diagnostics and Repairs for 1st Generation Boards
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