© Ernst Nagel GmbH 2S Trimmer Service Manual en.doc Rev.1.0. 20.07.2011
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Contents
5. Troubleshooting
(continued)
5.3 Fault Code Solutions
(continued)
STR 027
Motor8 Short Circuit
Procedure
Disconnect the Motor plug M8. Run the diagnostics.
Fault code STR 028(Open Circuit) is displayed?
Y N
Disconnect connector J7. Check wires for Short Circuit across leads. (Orange3 & Violet10)
Is there a short Circuit?
Y N
Disconnect plug 5P2 from PCB5 Check wires for Short Circuit across leads. (Orange2 & Violet9)
Is there a Short
Circuit?
Y N
Replace
PCB5
Replace
wire
harness
Replace
wire
harness
Replace motor STR-M8
STR 028
Motor8 Open Circuit
Procedure
Disconnect the motor plug M8. Enter service mode and cycle the Motor M7. Measure between the Orange and Violet wire.
The
voltage is approximately 22VDC?
Y N
Disconnect connector J6 and cycle Motor M7. Measure between the Orange and Violet wire. (Orange3&Violet10).
The
voltage is approximately 22VDC?
Y N
Disconnect plug 1P2 from PCB1 and cycle Motor M7. Measure between points 2 and 9.
The voltage is approximately 22VDC?
Y N
Replace
PCB1
Replace
wire
harness
Replace
wire
harness
Replace Motor M7