Service manual

Troubleshooting
5-3
5-3 Tech Mode
5-3-1 How to Enter Service Mode
In service mode (tech) mode, the technician can check the machine and perform various test to isolate the
cause of a malfunction.
To enter the Tech mode, press MENU, #, 1, 9, 3, 4 in sequence, and the LCD briefly displays ‘T’, the
machine has entered service (tech) mode.
While in Tech mode, the machine still performs all normal operations.
To return to normal user mode, press MENU, #, 1, 9, 3, 4 in sequence again, or turn the power off, then on
by unplugging and plugging the power cord.
Options changed while in service mode do not remain changed unless you clear the machine’s memory.
5-3-2 SYSTEM DATA
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.
SEND 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 arbitrarily.
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.