Sharp FO-77 Service Manual Download

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FO-77U

UX-66U

3. Diagnostic items description

3. 1. Soft switch mode

The soft switches are provided so that each operation mode can be set
by using the operation panel.

In this mode, these switches can be checked and set.

The contents of these switches are backed up.

The available soft switches are SW-A1 to SW-K1.

The content of soft switches is shown in page 2-5 to 2-17.

The contents are set to factory default settings.

3. 2. ROM & RAM check

ROM executes the sum check, and RAM executes the matching test.
The result will be notified with the number of short sounds of the buzzer
as well as by printing the ROM & RAM check list.
Number of short sounds of buzzer 0

→

No error

→

ROM error

→

RAM error (32Kbyte)

3. 3. Aging mode

If any document is first present, copying will be executed sheet by sheet.
If no document is present, the check pattern will be printed sheet by
sheet. This operation will be executed at a rate of one sheet per 5min-
utes, and will be ended at a total of 10 sheets.

3. 4. Panel check mode

This mode is used to check whether each key operates properly or not.
Press the key on the operation panel, and the key will be displayed on
the display. Therefore, press all keys. At this time,finally press the STOP
key.

When the STOP key is pressed, the keys which are not judged as
"pressed" will be printed on the result list.

• LED part of the contact image sensor (CIS) is kept on during the term

from when "START" of the panel test mode to end with the STOP key.

3. 5. Check pattern

This mode is used to check the status of print head. Two sheets of check
pattern are printed. The following information of check pattern is printed.

Vertical stripes (alternate white and black lines) Approx. 35 mm

Full black

Approx. 70 mm

Full white

Approx. 35 mm

3. 6. Signal send mode

This mode is used to send various signals to the circuit during FAX com-
munication. Every push of START key sends a signal in the following
sequence. Moreover, the signal sound is also output to the speaker when
the line monitor of the soft switch is on.

[1] No signal (CML signal turned on)

[2] 9600bps

[3] 7200bps

[4] 4800bps

[5] 2400bps

[6] 300bps (FLAG)

[7] 2100Hz (CED)

[8] 1100Hz (CNG)

[9] Pseudo Ring (models with auto TEL/FAX changeover function)

[10] END

3. 7. Memory clear

This mode is used to clear the backup memory and to reset to the fac-
tory default settings.
The content of each setting will be cleared.

Note: Be sure to execute the memory clear mode whenever you change

the country select setting. The default settings of the soft switches
vary according to the destinations. Therefore, if you do not execute
the memory clear after changing the country select setting, some
functions may not work.

3. 8. Shading mode

The mode is used for the shooting compensation. For reading, set up
the special original paper.

The shooting compensation memorizes the reference data of white and
black for reading.

Moreover, the memorized data is not erased even if memory clear mode
is executed.

3. 9. All black print

This mode is used to check the state of the printing head and inten-
tionally overheat it. Whole dots are printed over the interval of 2 m. If it is
overheated or the printing sheet is jammed, press STOP key for the end.

3. 10. Auto feeder mode

In this mode, a document is inserted and discharged to check the auto
feed function.

After this mode is started, set a document, and the document feed will
be automatically tested.

3. 11. Entry data send

This mode is used to send the registered data to the other machine and
to make the other machine copy the registered content. Before sending
in this mode, it is necessary to set the other machine at the entry data
receive mode.

The contents to be sent are as follows (the machine prints each list after
the transmission has completed):

1. Telephone list data

2. Sender (cover sheet) register data

3. Optional setting content

4. Soft switch content

5. Junk fax number list

6. Country setting content

2 – 3

RANK 0 or 1

Note:
There is a selection RANK 0 or 1 depending on resistance value of the
thermal head. RANK 0 or RANK 1 is printed at the tail of check pattern
to identify.