Table 36. Power on defect or blank display (continued) EN Chapter 7 Troubleshooting 189 Problem Action The fan does not turn on when the printer is first powered up. Note An operational fan indicates the following: 1. AC power is present in the printer. 2. DC power supply is functional (both 24 VDC and 3.5 VDC are being generated). 3. The engine controller board’s microprocessor is functional. If the fan is not working: 1. Turn the printer off and remove the formatter. Disconnect the optional accessories. 2. Turn the printer on and check the fan again. If the fan is still not working, perform the following steps: 1. Verify that the fan is connected to the engine controller board. 2.
Replace the fan. 3. Replace the engine controller board. Note The fan only operates during initial power on and while printing, unless the temperature inside the printer is too high. If the temperature is too high, the fan turns on to cool the inside of the printer. The fan works, but the control panel display is blank. 1. Print an engine test. See “Engine test” on page 190. 2. If the engine test is successful, perform the following steps: a. Reseat the control panel and formatter connector. b. Replace the control panel assembly. c. Replace the firmware DIMM. d. Replace the cable from the control panel. 3. If the engine test is not successful, replace the engine controller board.