Method Of Using Troubleshooting Chart - Komatsu ecot3 PC300LC-8 Shop Manual

40 Troubleshooting

Method of using troubleshooting chart

The troubleshooting chart consists of the "ques-
tions", "check items", "causes", and "troubleshoot-
ing" blocks.
The questions and check items are used to pinpoint
high probability causes by simple inspection or
from phenomena without using troubleshooting
tools.
Next, troubleshooting tools or direct inspection are
applied to check the narrowed causes in order from
the most probable one to make final confirmation
according to the troubleshooting procedure.
[Questions]:
Items to be drawn from the user or operator.
They correspond to A and B in the chart on the
right.
The items in A are basic ones.
The items in B can be drawn from the user or
operator, depending on their level.
[Check items]:
Items to be simply checked by the serviceman
to narrow down causes.
They corresponds to C in the chart on the right.
[Causes]:
Items to be narrowed from the questions and
check items.
The serviceman narrows down the probable
causes from A, B, and C.
[Troubleshooting]:
Items to finally verify whether the narrowed
down causes are undoubtedly the real causes
using the troubleshooting tools and direct
inspections.
Items listed in the [Questions] and [Check items] and related to the [Causes] are marked with
E
: Causes to be referred to for questions and check items
Q
: Causes related to questions and check items
w
: Causes highly probable among ones marked with
a When narrowing the "causes", apply the items marked with
When narrowing the causes, do not apply the items marked with
the causes cannot be narrowed, however, you may apply them.)
PC300, 350-8
Q
w
before those marked with
E
. (If no items have other marks and
SEN02634-02
1
E Q w
, , or .
Q
.
3