HP LaserJet 3052 Service Manual - Page 290

Translating the fax trace report (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only) Print a fax log report. The fax log report contains information about the product's interpretation of the problem. Read the time sequences, looking for abnormal activity on the fax trace report. See Table 6-8 Fax phase sequence (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only) on page 270, and Table 6-9 Appropriate responses (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only) on page 271, to separate normal from abnormal activity. Fax abbreviations appear in Table 6-10 Fax abbreviations (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only) on page 273. Identify the phase in which the error occurred. NOTE ??? represents an unidentified command. Examples of a successfully sent fax and a successfully received fax appear after the tables. Table 6-8 Fax phase sequence (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only) Sequence Calling station Called station Phase A-Call setup sequence 1 Ring signal 2 CNG tone beep, 500 Hz for 1 second 3 Transmit CED, 2100 Hz for 3 seconds 4 Transmit NSF 5 Transmit CSI 6 Transmit DIS 7 DIS detected Phase B-Pre-message procedure (negotiate compatible format/protocol) (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only) 8 Transmit TSI 9 Transmit DCS, select mode 10 DCS detected 11 Transmit TCF/training 12 Transmit FSK 13 Training (synchronize signals), check for errors 14 Transmit CFR 15 Detect CFR Phase C-Message transmission (page/scan transmission) (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-inone only) 16 Transmit message (FSK, followed by date) 270 Chapter 6 Troubleshooting ENWW