Good day how do I fix a problem on the IBM 6500 printer not powering up. The power supply has been to be OK. The main board has been replaced. The fans are not running etc. IBM Infoprint 6500 Matrix Printer

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If you replace the main PCB you need to move the Key over or it won't post (grey squares on the panel with no fans on). It is a small 3-pin plug near the flash memory slot.

In addition to that if you have the V5 controller you would need to move the Flash memory chip and the DRAM.

After you do that you will need to load the microcode on the PCB. I can get you instructions to do this.

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