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113

This section explains general troubleshooting procedures for the 400 series of Information Codes. These 
errors are primarily caused by poor telephone line quality (loss, noise, echo, etc.). This unit is furnished with 
Service Mode 1 to assist in troubleshooting line quality problems.
It is suggested that both the transmitting unit and receiving unit be adjusted. This section gives relevant 
parameters in Service Mode 1 for the transmitting and receiving sides. If no improvement is realized after 
the parameters are adjusted, it is recommended that the parameters be returned to the default settings.

START

No

Yes

Is this an international

#021 : Off

On

#025 : 1st

2nd

#018 : 14400 bps

12000 to 2400 bps

#024 : 2100 Hz

1080 Hz

#030 : 75 ms
#033 : 33600 bps 

 31200 to 2400 bps/
TC9600/TC7200

1 sec

communication?

#010 : -9 dBm

0 to -15 dBm

To improve a poor S/N (signal-to-noise ratio).

#017 : 14400 bps

12000 to 2400 bps

#011 : -43 dBm

-33 dBm or -38 dBm

#018 : 14400 bps
#019 : On      Off 

12000 to 2400 bps

To equalize loss (Amplitude Distortion) between the fax unit,
and the phone company exchange.

#025 : 1st

2nd

1080 Hz

#030 : 75 ms 1 sec

To cope with shifted signal sequences caused by an echo.

#070 : 128

256 to 2048

To cope with impulse noise.

Perform a communication test after changing settings.

#014 : 0 dBm

4, 8, 12 dBm

#013 : 0 dBm

4, 8, 12 dBm

#033 : 33600 bps

31200 to 2400 bps

#023 : Normal

Long

#033 : 33600 bps

31200 to 2400 bps

#024 : 2100 Hz

114

START

Yes

Make a copy.

No

No

Yes

Is the printed copy normal?

Perform a transmission test
to a reference fax unit.

Is the LED Array lit?

Does CN1, pin 1 on the 
SC PCB measure
+24 VDC? 

Yes

No

Yes

No

Are CN7 (SC PCB) 
and CN30 (CCD PCB)
connected  properly?

Connect them correctly.

Replace the LVPS.

Does nLEDON go Low 
when the scan starts?

Check CN1 on the SC
PCB, and the LED

harness. 

Does the problem still
occur?

Replace the LED Array.

The receiving unit may be
defective.

1. Replace the Scanner
    Block.
2. Replace the SC PCB.

Replace the SC PCB.

Is the transmitted copy
normal?

No

Yes

No

No

    and CN28, and 29 (MJR PCB).
2. Check the telephone line cable.
    Replace if necessary.

Does poor transmitted copy
appear when transmitting to
a specific receiver?

Telephone line quality is
poor.

END

Yes

Yes

Yes

1. Check CN18 (SC PCB),

115

START

END

No

Yes

Does the unit proceed to
Phase B?

1. Set documents on the ADF correctly.

4. Refer to Sect. 4.6.

3. The called party is busy.

2. Check the telephone line connection.

Are you using One-Touch 
or ABBR dialing?

Are you using direct dialing?

No

Yes

Check the registered telephone number.

Is the Monitor Volume 
too loud, or too low?

No

Yes

Check the dialed telephone number.

No

Yes

Adjust the monitor volume by pressing the 
"/\" , or  "\/" curser keys.

116

START

END

Yes

No

Does the ID display?

1. No ID function at the remote unit.
2. The ID is not set for the remote unit.

Does the Verification Stamp 
operate? 

Is the copy quality OK?

Yes

No

No

1. Set "STAMP=ON"
2. Check CN3 (SC PCB).
3. Replace the Stamp Solenoid.
4. Replace the SC PCB.

Any other problems?

Yes

No

Make a copy, and refer to Sect. 4.4.

Yes

See Sect. 4.3. (Troubleshooting with the 
Information Codes).