© Ernst Nagel GmbH 2S Trimmer Service Manual en.doc Rev.1.0. 20.07.2011
54
Contents
5. Troubleshooting
(continued)
5.3 Fault Code Solutions
(continued)
STR 011
Motor4 Short Circuit
Procedure
Disconnect the Motor plug M3. Run the diagnostics.
Fault code STR 012(Open Circuit) is displayed?
Y N
Disconnect connector J7. Check wires for Short Circuit across leads. (Red2 & Black9)
Is there a short Circuit?
Y N
Disconnect plug 5P3 from PCB5 Check wires for Short Circuit across leads. (Red6 & Black7)
Is there a Short Circuit?
Y N
Replace
PCB5
Replace
wire
harness
Replace
wire
harness
Replace motor STR-M4
STR 012
Motor4 Open Circuit
Procedure
Disconnect the motor plug M4. Enter service mode and cycle the Motor M4. Measure between the Red and Black wire.
The voltage
is approximately 22VDC?
Y N
Disconnect connector J7 and cycle Motor M3. Measure between the Red and Black wire. (Red2&Black9).
The voltage is
approximately 22VDC?
Y N
Disconnect plug 5P3 from PCB1 and cycle Motor M3. Measure between points 6 and 7.
The voltage is approximately 22VDC?
Y N
Replace
PCB5
Replace
wire
harness
Replace
wire
harness
Replace Motor M4