Yamaha F20A, Service Manual

Page: 374 / 444

8-9
– +
ELEC
E
ELECTRICAL ANALYSIS
ELECTRICAL ANALYSIS
INSPECTION
Digital circuit tester
NOTE:
Throughout this chapter the digital circuit
tester’s part number has been omitted.
Refer to the following part number.
NOTE:
“ ” indicates a continuity of electric-
ity (i.e., a closed circuit at the respective
switch position).
Digital circuit tester:
J-39299/90890-06752
Peak voltage measurement
NOTE:
●
When checking the condition of the igni-
tion system it is vital to know the peak
voltage.
●
Cranking speed is dependant on many
factors (e.g., fouled or weak spark plugs, a
weak battery). If one of these is defected,
the peak voltage will be lower than speci-
fication.
●
If the peak voltage measurement is not
within specification the engine will not
operate properly.
●
A low peak voltage will also cause compo-
nents to prematurely wear.
Peak voltage adaptor
NOTE:
●
Throughout this chapter the peak voltage
adaptor’s part number has been omitted.
Refer to the following part number.
●
The peak voltage adaptor should be used
along with the digital circuit tester.
Peak voltage adaptor:
YU-39991/90890-03169