OKI C930

a) Nothing is displayed on the LCD

• CU PCB Malfunction
  Has the power short-circuited on the CU PCB? (C7099: +5v)/ Does the LED lightup normally? (PWR_GOOD Green: Light ON, IAG_LED3-0 Red: Light OFF, FPGA_LED Green: Light ON) → If NO GOOD, check to see if the RAM DIMM is normally inserted.
• Others
  Power, Operation Panel, Fuse, etc.

b) "Communication Error" is displayed

• CU PCB Malfunction
  Does the LED lightup normally? (PWR_GOOD Green: Light ON, DIAG_LED3-0 Red: Light OFF, FPGA_LED Green: Light ON) → If NO GOOD, remove in the sequential order of RAM_DIMM and HDD. Does the Light On state vary?
  If the LED Light On state is Normal, replace the applicable part.
  If light ON is not normal, then replace PCB.

c) "Initializing" remains displayed.

• CU PCB Malfunction
  Does the LED lightup normally? (PWR_GOOD Green: Light ON, DIAG_LED 3-0Red: Light OFF, FPGA_LED Green: Light ON) → If NO GOOD, remove in the sequential order of RAM_DIMM and HDD. Does the Light On state vary?
  If the LED Light On state is Normal, replace the applicable part.
  If light ON is not normal, then replace PCB.

d) Error Message Display

Following the processing procedures of the Error Message in the table attachment.

When “Communications Error” appears on the display panel, this message is displayed with the PU. This indicates a problem has occurred in the AS3 board during its initialization. In such a case, open the sheet metal of the CU board and check the lit LED on the AS3 board to locate the problem.

The LED mounted on the AS3 PCB come in the following types. The description of the cases when they do not light up normally are described below.

PWR_GOOD (Green):	This indicates the power status of the AS3 PCB. It lights up when the various power output sources (CPU core voltage, 2.5V, 3.3V, 5V0 of the AS3 PCB are normal. If it does not light up, disassemble the RAM_DIMM and HDD. Check to see if it will lightup in this state.
DIAG_LED[3: 0] (Red):	This indicates the initialization processing state of the AS3 PCB. It will all lightup immediately after the power is turned ON. It will all dim down when the initialization process is successfully completed. If all lights do not dim, then there is a CU PCB malfunction. If all lights do not dim, then disassemble the RAM_DIMM and HDD. Check to see if it will lightup again in this state. * When the HDD is not correctly recognized or when the download switch is in the down position, DIAG_LEDs 2 and 0 are on and DIAG_LED 1 is out.
HDD_LED (Red):	This lights up when accessing the HDD. If it does not start flashing even after the power is turned ON, replace the HDD and check to see if the problem is corrected. Check to see that the download switch is facing upward.
FPGA_LED (Green):	This lights up when communication is enabled between the engine and panel interface. If it does not lightup, then disassemble the RAM_DIMM and HDD. Check to see if it will lightup again in this state.