Barcode not reading

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Unit need to send back for repair. Below is the selftest resutl SELF TEST START, REINITIALIZING........ OK INTERNAL RAM TEST...................... OK 35-338200-13 .............CHECKSUM = 375B 35-338201-20 .............CHECKSUM = ABE3 EXTERNAL RAM TEST TESTING A0 TO A7 ...................... OK TESTING A8 TO A17...................... OK BYTE PATTERN TEST...................... OK WORD PATTERN TEST...................... OK NOVRAM TEST............................ OK CPU VIDEO INPUT TEST .................. OK VIDEO INPUT Default to White TEST ..... FAILED TESTING LASER ON MOTOR OFF CARRIAGE RETURN TO SKIP DELAY LASER CURRENT IS = 04.................. OK STARTING SCANNER INIT MOTOR SPEED TEST MOTOR SPEED IS = 420 Sps............... OK TESTING LASER OFF LASER CURRENT IS = 03.................. OK TURNING LASER ON LASER CURRENT IS = 37.................. OK .....Place a label @ the Inside EDGE... CARRIAGE RETURN TO SKIP DELAY......... OK Barcode A/D Rectifyer Reset. Value = 00 OK GAIN at MAXIMUM A/D READ VALUE = 00 GAIN at MINIMUM A/D READ VALUE = 00 Min Gain needed to start Digitizer = 131 Verifying GAIN Changed................. FAILED GETTING MINIMUM D/A VOLTAGE.....Value = 127 Place a Label at the MAX read Distance. CARRIAGE RETURN TO SKIP DELAY............ OK GETTING MAXIMUM D/A VOLTAGE.....Value = 199 SELFTEST FAILED Press Carriage Rerurn to Exit SELFTEST Without Saving AGC SETTINGS Press the "S" key to Exit SELFTEST and Save AGC SETTINGS OK SELFTEST COMPLETE