Yamaha SR250G Service Manual page 69

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CHAPTER 6. ELECTRICAL SYSTEM
IGNITION SYSTEM
Block Diagram
Pek-up 201
Wone/Aed
wrwe/roen
Teta:
uy cone, goats an
Angler
Description
This model is equipped with 2 battery oper-
ated, fully transistorized breskerless ignition
system. By using magnetic pick-up coll the
need for contact breaker paints is eliminated
This adds to the dependability of thy systein
by eliminating frequent cleaning and acjust-
ment of paints and ignition timing. This TC!
unit incorporates an automatic
advance cir-
cuit controlled by signals generated by
the
pick-up coil, This adds to the dependability
of che system by gliminating the mechanical
advancer. This ICI (Iransister Control. Igni-
tion) system consists of two main units: 0
pick-up unit and an \grtcor uni
Operation
The TC) {Transistor Contro!
tions on the same prin
Ignition) func
DEC igniticn system with the exception of
using magnetic pick up coit and a T.C.1. unit
in place of contact breaker pots,
64
&
a. Pick-up unit
Tris unit consists of a pick-up coil and a
maynet mounted on the generater base.
When the rotor projection pesses this
pick up coil, the two signals are yen-
eratwd at the pick-up coil and wansmit-
ted to the ignitor unit as A signal. The
full ignition advance is determined by
the lenath of the rotor projection.

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