SHARP CX164 Technical Report

Date: Oct. 21, 1994

COLOR IMAGE SCANNER: JX-325

No. : CX-164

[Service information]

SERVICE MANUAL CORRECTIONS

1.Model name: JX-325

2.General: There were false descriptions in the service manual. We have corrected them.

3.Description: (1)There were missed descriptions in the page 3 “• Maintenance mode setting”

Therefore we have added Panel display test and Heater test.
These descriptions have been in the item 5. Diagnostics.

Maintenance mode setting

Switch

SW1

(*) The maintenance mode has the following options.

.

No

1 00000000Standard

2 11110000

3 01010101

4 10100001

5 00000011

6 00001011

7 00101011

8 01001 011

9

10 00011111

(*1) When you carry out this test, the DIP SW2 has to be set as
following diagram.

Switch No.

8
0
1 Maintenance mode (*)

Mode

Transit,
packing

Panel
display
test (*1)

Heater
test

Aging test

White
balance
test

Correction
circuit test

Line buffer
test

MTF test

Transparent
unit test

DIP SW2
12345678
10101010

DIP SW1

12345678

00011011

Content

Normal mode

Function

Normal operation
Shifts the scanner

head to the fixed
position for transit.

Checks the operation
of DIP SW1, SW2,
and display LED.

Checks the power
supply to the heater.

Lights the three
lamps in
sequence, and
performs all area
scanning.

Repeats white
balance lighting
after white
balance.

Checks shading
and the
dark-component
correction circuit
function.

Checks the MTF
peripheral line
memory operation.

Checks MTF edge
emphasis.

Checks the
transparent unit
operation.

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SHARP CORPORATION Printer and Scanner Division

Orange

C

(2)In the “5-2. Diagnostic execution and cancellation” it was described that the white

balance test, the correction circuit test and the line buffer test were executed by turning
off the DIP SW1 No. 8. However this was false. There is no need to turn the switch off.
We have made a new flow chart this time.

5-2. Diagnostic execution and cancellation5-2. Diagnostic execution and cancellation

Power is turned OFF

Set DIP SW1 and SW2
to the desired mode
(Refer to 5-1)

Power is turned ON

Execution of tests

Power is turned OFF

All of DIP SW1 are set to OFF

Execution of
diagnostic

Refer to 5-3-1
turn 5-3-6

Cancel lation of
diagnostic

Caution: About the MTF test and the transparent unit test, testing methods are shown in

the item 5-3, the test diagnostic contents.

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