Error Code Possible Cause Check Point RemarksClassified Code ST1 ST2 ST3 ST4F52(Skew (R) Sensoradjustment error)42 00 00 00 1. Paper dust exists on or around aSkew (R) Sensor.1. Blow off the dirt on surface of the sensorwith the accessory blower. (See 7.2.)2. Execute Key / Sensor and SensorSensitive Level tests in Sec.9.3.6 tocheck the sensor condition.2. The Skew (R) Sensor does notwork, properly.1. Execute Key / Sensor and SensorSensitive Level tests in Sec.9.3.6 tocheck the sensor condition.2. Check whether the sensor alignment isproper (whether the sensor direction facesto its reflector).3. Check the following connection andsoldering condition on each connector.a. CN5030 (SKEW (R) Board) toCN5029 (WAITING SENSOR Board)b. CN5027 (WAITING SENSOR Board)to CN5025 (RELAY (UPPER) Board)c. CN5022 (RELAY (UPPER) Board) toCN1014 (CONTROL Board)4. Check the following signals.a. SKEW_R signal (CN5030-2 nd pin,CN5029-2 nd pin, CN5027-2 nd pin,CN5025-2 nd pin, CN5022-4 th pin,CN1014-4 th pin)→ 0 V (when none exists on theSkew (R) Sensor)b. Check the reference signals for theSKEW_R signal on the CONTROLBoard.→ IC1015-2 nd pin: 1.5 V or less(After initializing)→ IC1017-5 th pin: Approx. 1.5 Vc. Check comparator output signal.→ IC1017-2 nd pin: 3.3 V(When no paper exists)5. Replace faulty parts or boards.118KV-S3065CLSERIES / KV-S3065CWSERIES