EY35, EY40 - Small Engine Discount
EY35, EY40 - Small Engine Discount
EY35, EY40 - Small Engine Discount
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8. ROBIN SOLID STATE IGNITION ENGINE (OPTION)<br />
8-1 FEATURES<br />
The S.S.I. system is free of the weak points of the conventional point type ignition system, that is, ignition failure due to a<br />
dirty or burnt contact point, oxidation during long storage,and mechanical wear,and featuresmaintenance-free performance,<br />
proper sparking, and freedom from the ill effects of water, oil dust, and moisture.<br />
8-2 BASIC CIRCUIT and OPERATING THEORY of<br />
S.S. I. SYSTEM<br />
1) As the flywheel and magneto rotate, a voltage is in-<br />
duced in the exciter coil, and flows through the pri-<br />
mary wire to the transistor base. A<br />
2) At the same time, the transistor is energized to form a<br />
circuit between the exciter coil and the transistor. B<br />
3) At the ignition time, electric power flows from the<br />
pulser coil to the SCR gate to energize the SCR. C<br />
Thus the current flowing to the transistor is cut off,<br />
and the exciter current suddenly rushes to the prima-<br />
ry side of the ignition coil. D Thus, a high voltage is<br />
generated on the secondary side of the ignition coil to<br />
produce a spark in the spark plug. E<br />
L<br />
IGNITION UNIT<br />
Fig. 50<br />
"-1<br />
IGNITION COIL<br />
8-3 CHECKING IGNITION UNIT with TESTER<br />
The ignition unit can be checked with an ordinary circuit<br />
tester.<br />
Checkit as shown in the table at right, and if the test results<br />
are as specified, the ignition unit is in normal condition. If<br />
any of the test results is not satisfactory, replace the whole<br />
ignition unit.<br />
NOTE: Use a circuit tester, not a megger or other<br />
tester that requires high ovltage. ON in the<br />
table indicates the forward characteristic of<br />
the diode, and if the tester pointer moves to<br />
a certain extent, it is good.<br />
OFF in the table indicates ma.<br />
8-4 MEASURING RESISTANCES of EXCITER COIL and PULSER COIL<br />
Connect (+) terminal of tester.<br />
I<br />
Exciter Coil<br />
Pulser Coil<br />
A - t B<br />
A + B<br />
STD<br />
150W<br />
0.97Q * 20%<br />
4.5R * 20%<br />
66Q * 20%<br />
t<br />
Fig. 51<br />
* Values in the table above apply where ambient temperature 20°C. is<br />
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