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125

     

DX-600/800

APR 2002

Edition 1.0

START

END

No

Is the Control Panel Unit locked?

Close the Control Panel Unit firmly.

Yes

No

Is the ADF Roller clean?

Clean the surface of the roller
with isopropyl alcohol (Sect. 2.2.4)

Yes

No

Is the ADF Roller worn out?

Replace the ADF Roller
(Sect. 2.2.8).

Yes

No

Does the ADF Roller drive 
properly?

Does the ADF Roller's gear
system function properly?

Yes

No

Separation Rubber  normal?

Is the adjustment of the

Is the Separation Rubber worn
out?

Replace the Separation Rubber.

No

Clean or adjust the Separation
Rubber Pressure (Sect. 2.2.2).

No

Yes

Adjust the gear system or replace
defective parts.

Yes

Yes

126

     

DX-600/800

APR 2002

Edition 1.0

END

START

Close the Control Panel Unit 
firmly.

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

Is the Control Panel Unit
closed?

Clean or replace PNL1 PCB.

Do all sensors on the PNL1
PCB operate normally?

Clean the surface of roller 
with isopropyl alcohol
(Sect.2.2.4).

Does the Feed Roller have 
drive and sufficient friction?

Remove the foreign particles 
or papers from the document 
path.

Is the document path clear
of foreign particles or paper?

Adjust or replace any 
defective parts.

Is the Transmitting 
mechanism operating 
properly?

127

     

DX-600/800

APR 2002

Edition 1.0

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

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

#032 : 33600 bps

31200 to 2400 bps

#023 : Normal

Long

#032 : 33600 bps

31200 to 2400 bps

#024 : 2100 Hz

128

     

DX-600/800

APR 2002

Edition 1.0

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

1. Check CN18 (SC PCB)
    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