Machine Test; Switch Test; Modem Test; Dram Test - Samsung SCX-4720F Service Manual

6.4.4 Machine Test

SWITCH TEST

Use this feature to test all keys on the operation control panel. The result is displayed on the LCD window each
time you press a key.

MODEM TEST

Use this feature to hear various transmission signals to the telephone line from the modem and to
check the modem, amplifier and speaker. If no transmission signal sound is heard, it means the
modem part of the main board, amplifier, speaker or speaker harness is faulty.

DRAM TEST

Use this feature to test the machine's DRAM. The result appears in the LCD display.
If all memory is working normally, the LCD shows << O K >>

ROM TEST

Use this feature to test the machine's ROM. The result and the software version appear in the LCD
display.
• FLASH VER : 1.00 V
• ENGINE VER :1.00V

PATTERN TEST

Using this pattern printout you can check that the printer mechanism is functioning properly.
This function is for factory manufacturing use only.

SHADING TEST

The function is used to set the optimum scan quality determined by the specific characteristics of
the CCD (Charge Coupled Device). If copy image quality is poor perform this function to check the
condition of the CCD unit.
< Method >
1. Select the [Shading Test] in TECH MODE
(Menu, #, 1934).
2. Push the ENTER button and an image will
be scanned.
3. After scanning the CCD SHADING PRO-
FILE will be print out.
4. If the printed image is different to the sample
image shown the CCD is defective.
NOTICE : When you test the CCD, make
sure that the cover is closed.
Samsung Electronics
Alignment & Adjustments
Service Manual
6-15