Daedong DSC48, Workshop Manual

Page: 264 / 290

7
-24 Apr. 2007
DSC48
4.5 TROUBLESHOOTING
Symptom Cause Action
The automatic feeding depth
control function does not
operate and the automatic
feeding depth control lamp
does not come on. • The check lamp does not operate correctly when
turning the ignition switch.
- The MICOM unit is not supplied with power.
- Or faulty ground of the MICOM unit
• Faulty input signal from the automatic feeding depth
control switch
• Power to MICOM unit
• Ground of MICOM unit
• Input signal wire
The automatic feeding depth
control lamp does not come
on (though the function
operates). • Power is not supplied to the automatic feeding
depth control lamp.
• Blown lamp bulb
• Power
• Replacement
The automatic feeding depth
control lamp comes on but
the automatic feeding depth
control function does not
operate. • There is no relay sound from the threshing controller
when either the deep and shallow control is engaged.
- Faulty input signal from the threshing switch (open
circuit)
- Faulty input signal from the straw sensor (open
circuit)
- Faulty input signal from the reverse switch
(ground)
- Faulty input signal from the neutral switch (open
circuit)
- Faulty input signal from the vehicle speed sensor
(open circuit)
- Faulty input signal from the grain sensors S1·S2
- Defective limit switch (manual operation
unavailable as well)
• There is relay sound from the threshing controller
when either the deep and shallow control is
engaged.
- Faulty feeding depth control motor to power (open
circuit)
- Faulty feeding depth control motor to ground
(open circuit)
- Defective feeding depth control motor
• Input signal wire
• Input signal wire
• Input signal wire
• Input signal wire
• Input signal wire
• Input signal wire
• Replace
• Connector to main wiring
of threshing controller
• Power to feeding depth
control motor
• Ground of feeding depth
control motor
• Replace
The Deep (or "Shallow")
function does not operate. • Only manual operation is available.
- Defective wiring or connector between the deep
relay coil (or shallow relay coil) and MICOM unit
(open circuit)
- Faulty input signal from the grain sensors S1 or S2
• Connector to main wiring
of threshing controller
• Power
• Input signal wire
• Even manual operation is unavailable.
- No power is supplied to the feeding depth control
relay (shallow relay).
• Open circuit in the deep (shallow) relay coil
• Defective deep (shallow) limit switch
(no continuity)
• Power
• Connector to main wiring
of threshing controller
• Connector of threshing
controller
• Replace limit switch
The feeding depth does not
change to either "Standard"
or "Deep" after the feeding
depth selection switch is
set in the "Standard" or
"Shallow" position. • Faulty input signal from the feeding depth selection
switch
• Input signal wiring