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Problem Resolution5Ć42
Setting Function Parameters to Solve Communication Problems on the HP FAX-900 and
FAX-950
Communication problems are announced by information codes in the 400 to 500 range. For basic problems with the
telephone line (unable to dial a station or not answering, for example), consult the User’s Guide for the HP FAX-900
and FAX-950.
Table 5-5 shows the function parameters to adjust for specific communication problems in the HP FAX-900 and
FAX-950. Adjust both the transmitting and receiving fax machines for best results. If the adjustments do not improve
the line quality, set the function parameters of both machines back to the default settings.
Table 5-8. Compensating for Communication Problems in the HP FAX-900 and FAX-950
Transmitting Fax Machine Receiving Fax Machine
Function
Parameter
Function Parameter
Setting (From ⇒ To)
Function
Parameter
Function Parameter
Setting (From ⇒ To)
For International Com-
munication
021
025
Invalid ⇒ Valid
1st ⇒ 2nd
018
024
030
9600 bps ⇒ 7200, 4800,
2400 bps
2100 Hz ⇒ 1080 Hz
75 ms ⇒ 1 sec
To Equalize Loss (Am-
plitude Distortion Be-
tween Machine and Ex-
change of Phone Com-
pany
013 4 dB ⇒ 8 or 12 dB
To Cope with Poor S/N
Ratio
010
017
–9 dBm ⇒ 0 to –8 dBm
9600 bps ⇒ 7200 to 2400
bps
011
018
023
–43 dBm ⇒ –33 or –38 dBm
9600 bps ⇒ 7200 to 2400
bps
Normal ⇒ Long
To Cope with Impulse
Noise
100 128 ⇒ 256 to 2048
To Cope with Shifted
Signal Sequence
Caused by Echo
025 1st ⇒ 2nd 024
030
032
2100 Hz ⇒ 1080 Hz
75 ms ⇒ 1 sec
Valid ⇒ Invalid
Corrective Actions for the HP FAX-900 and FAX-950
Use the procedures described in this section to perform routine corrective actions such as clearing a paper jam, solving
document misfeed problems, or resolving a poor print quality problem. The HP FAX-950 is shown in the illustrations,
but the procedures are applicable to the FAX-900 also.
Clearing a Paper Jam
To clear a paper jam, perform the following steps:
1. Open the top cover located just above the automatic document feed cover. Grasp each end of the top cover and
lift it open.
2. Remove the jammed paper.
3. Close the top cover.