Xerox FaxCentre F12, Service Manual

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Maintenance & Troubleshooting
7-4 3/03 WorkCentre Pro 412, FaxCentre F12 &
WorkCentre M15/M15i
7-2-2 Tech Mode
The tech mode is used to test certain functions of the machine. The available tests are:
•User mode: Clean drum, Notify toner low
•tech mode: switch test, modem test, SRAM test, DRAM test, ROM test, Pattern test, Clear count, Answer
On CNG, Adjust shading, Flash upgrade.
To enter the Tech Mode:
1. Enter the Tech mode by pressing Menu, #, 1, 9, 3, 4. The letter “T” will appear in the top right of the
display.
2. In Tech mode, press Menu, ‘Maintenance [System]’ is displayed on the LCD.
3. Press the Select key
4. Scroll to the options by pressing Up and Down navigation key repeatedly until the correct selection is
found.
5. Press the Select key to initiate the tech mode.
6. Perform step 1 to return to user mode.
7-2-2-1 Maintenance Menu Functions
Dialing Mode
Select the dialing mode according to the user's line status.
• TONE: Electrical type of dial
• PULSE: Mechanical type of dial
Silence Time
In ANS/FAX mode, after a call is picked up by the answering machine, the machine monitors the line. If a
period of silence is detected on the line at any time, the call will be treated as a fax message and the
machine begins receiving.
Silence detection time is selectable between limited (about 12 seconds) and unlimited time.
When '12 sec' is selected, the machine switches to receiving mode as soon as it detects a period of
silence. When 'unlimited' is selected, the machine waits until the answering operation is concluded even
though a period of silence is detected. After the answering operation is concluded, the machine switches
to receiving mode.
Set Fax Level
You can set the level of the transmission signal. Typically, the Tx level should be under -12 dBm.
CAUTION
The Send Fax Level is set at the best condition in the shipment from factory. Never change settings arbi-
trarily.
Error Rate
When the error rate is about to be over the setting value, the Baud rate automatically lowers up to 2400
bps to make the error rate remain below the setting value. You can select the rate between 5% and 10%.
Modem Speed
You can set the maximum modem speed.
Communication is done with modem speed automatically set at lower speed when communicating with the
modem with lower speed since communication is done on the standard of the side where modem speed is
low for transmission/reception. It is better set 33.6Kbps as default setting.