Samsung SF 5100, Service Manual, Page: 15 / 192

Samsung Electronics 3-5
Tech Mode
The Engine test mode is used to check the operation
of the components related to the printer engine.
The following test are available.
• MHV ON/OFF
• DEV ON/OFF
• THEVEA(THV-) ON/OFF: tests THV- voltage
on/off.
• THV+ REF ON/OFF: tests THV+ voltage on/off.
• THV TRIGGER: tests THV+ trigger.
• MAIN MOTOR ON/OFF
• SOLENOID ON/OFF
• LSU MOTOR CHECK: tests the operation of LSU
motor
• HSYNC CHECK: tests the operation of laser diode
module of LSU.
• SENSOR CHECK: tests various sensors and
switches. ([FD]: Feed sensor, [ET]: Exit sensor,
[PE]: Paper empty, [CO]: Cover switch)
• PWM CODE: tests variability of THV- voltage.
([000]: outputs about 5 KVdc, [255]: outputs about
0 Vdc)
• FUSER TEST: tests the temperature of the fuser.
When printing, the fuser operates in the
temperature set for printing. When the power is
turned off and back on, the fuser restores the
temperature to default. ([161]: about 150 °C, [143]:
about 170 °C)
• TOP MARGIN SET
• BIAS TEST VALUE: tests variability of bias
voltage. When printing, the machine operates in
the bias voltage set for printing. When the power
is turned off and back on, the machine restores the
bias voltage to default. ([172]: outputs about 350
Vdc, [196]: outputs about 450 Vdc)
• THV TEST VALUE: When printing, the machine
operates in THV+ voltage set for printing. When
the power is turned off and back on, the machine
restores THV+ voltage to default. ([000]: outputs
about 5 KVdc, [255]: outputs about 0 Vdc)
To access the Engine test mode:
1. Press
Setup, #, 1, 9, 3, 1
in sequence.
2. When ‘ENGINE TEST?’ appears, press
Start/Enter .
3. Scroll the options by pressing or repeatedly
find the one you want.
4. Press Start/Enter to start the test.
5. Press
Stop
to exit the Engine test mode.
3-5 Engine Test Mode