OKI C532dn

2.1 Checking connections

Check item	Checking method	Action in case of NG
Connection between the printer and AC power supplied	Check the connection between the printer and AC power supplied.	Connect the AC cable properly.
Cable assembly connecting low-voltage power supply unit to CU/PU board	Make sure the low-voltage power supply unit is connected to the POWER connector on the CU/ PU board properly. Check whether the cable connector is half-connected or tilted.	Connect the cable properly.
	Check whether there is any fault in the cable assembly, e.g., missing wires.	Replace the cable with a good cable.
Connection between CU/PU board and TP1 board	Make sure the 20-pin FFC is connected to the OPE_TP1 connector on the CU/PU board properly. Check whether the cable connector is half-connected or tilted.	Connect the FFC cable properly.
	Check for broken wires using a tester. Check visually whether the sheath peels.	Replace the FFC cable with a good cable.

2.2 Confirmation of the power switch LED

Check item	Checking method	Action in case of NG
Power Switch LED	Confirm whether the LED is off. If the LED blinks rapidly, the number of blinking times in a cycle shows an error. The timing of blinking rapidly is shown in the below figure	Replace either of the low-voltage power supply unit, the CU/PU board, Power SW-board, the cables connected to the low-voltage power supply unit and CU/PU board or the cables connected to the CU/PU board and Power SW-board. In case of 2, 4, 8 or 10 times of LED blinking rapidly: Replace either of the low-voltage power supply unit, the CU/ PU board, the cables connected to the lowvoltage power supply unit and the CU/PU board. In case of 3, 6 or 9 times of LED blinking rapidly: Replace the CU/PU board.

2.3 Checking power supplies

Check item	Checking method	Action in case of NG
AC power supplied to printer	Check the supplied voltage of the AC power supplied.	To supplies the AC power.
AC power supplied to CU/PU board	Check the supplied voltage of the connector on the CU/PU board. POWER connector 7pin: 5V 12,13,14pin: 24V 8,9,10,11pin: 0V	Replace the low-voltage power supply. Replace the POWER cable.