Sharp DM-1500 Service Manual Download

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Main code

Sub code

Content

Shading check
(Outline)
Used to display the detection level of the white plate for shading. (Vref of AD conversion IC is fixed.)
(Operation/Procedure)
When the START key is pressed, the mirror base unit moves to the white plate for shading and Vref+ voltage of
AD conversion IC is set to 4.5V and Vref- voltage to 0.5V, and the copy lamp is lighted.
This state is kept for 10 sec, and the level of one pixel at the center is detected every second to display on the
value display section.

Self print only with the engine (1 by 2 mode)
(Outline)
Used to print in the 1 by 2 mode by ignoring the state of the optical system.
(Operation/Procedure)

When this simulation is executed, warming up is made and the ready lamp is lighted.

Select with the cassette select key and press the start key. Paper is fed from the selected cassette and
printing is performed.

In the 1 by 2 mode, one line is printed and two lines are not printed.

PCL PWB program download
Used to download the PCL PWB control program.
(Operation/Procedure)

Download procedures

1) When the simulation code is entered, the Ready lamp lights up and the Online lamp goes off.

2) When the PRINT switch is pressed, the Read lamp goes off and the Flash ROM data deleting operation is

started.

3) After completion of deletion, the Online lamp lights up.

4) Enter the DOS mode PC, and execute “COPY/Bxxxx.BIN LPT:”, and downloading is started. The Online

lamp blinks.

5) After completion of downloading, perform the SUM check.

If there is no problem, the Online lamp goes off and the Ready lamp lights up. If there is any problem,
“F9-10: PCL PWB trouble” is displayed.

6) Turn OFF/ON the power.

When downloading is failed, turn OFF/ON the power and perform the download procedures of 1 again.

Necessary items for Flash downloading

1) PC

2) Parallel cable

3) Program data file

3. TROUBLE CODES

A. Trouble codes list

Main
code

Sub

code

Trouble content

Detail of trouble

Duplex model memory setup error,
memory not-detected error

The memory is not set properly or the memory capacity is not set to the duplex setup
(6M).
Cancel method: Set SIM 26-39 code number to 2.

HSYNC not detected.

LSU (laser diode, reception element, APC circuit) trouble
LSU drive circuit (ASIC) trouble

CCD white level trouble

CCD drive circuit (CCD PWB, ASIC harness) trouble
Copy lamp lighting trouble (Copy lamp, invertor PWB)

CCD black level trouble

CCD drive circuit (CCD PWB, ASIC, harness) trouble

Shading trouble (White correction)

Dirt on white plate for scanning white level

ASIC connection trouble

Improper connection between CPU and ASIC (pattern cut, improper connection of lead
pin)

Copy lamp disconnection trouble

Copy lamp or copy lamp drive circuit (invertor PWB) trouble Copy lamp disconnection

Feeding is not completed within
the specified time after starting
feeding.

When the mirror base is returned for the specified time (6 sec) in mirror initializing
after turning on the power, the mirror home position sensor (MHPS) does not turn
OFF. Or when the mirror base is fed for the specified time (about 6 sec) after start of
copy return, the mirror home position sensor (MHPS) does not turn OFF.

Return is not completed within the
specified time.

When the mirror base is returned for the specified time (6 sec) in mirror initializing
after turning on the power, the mirror home position sensor (MHPS) does not turn
ON.Or when the mirror base is returned for the specified time (about 6 sec) after start
of copy return, the mirror home position sensor (MHPS) does not turn ON.

DM-1505

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