Honda CB400T Shop Manual page 205

HONDA
TECHNICAL FEATURES
C B 4 0 O T
1. PULSER WAVE FORMS AND SCR TRIGGER VOLT-
2.
PULSER WAVE FORMS WHEN ADVANCE STARTS
AGEBEFOREADVANCE
The voltage on the advance pulser rises to SCR trigger
Before advance starts, only the signal from the fixed pulser
voltage faster than that of the fixed pulser. If there is an
is applied t o SCR gate through the diode
2.
increase in engine speed, there will be
a
corresponding
advance in timing.
SIGNAL FROM FIXED PULSER (THROUGH D 2 )
SIGNAL FROM FIXED PULSER
. . .
SCR TRIGGER VOLTAGE
T.D.C.
-
SIGNAL FROM
ADVANCE PULSER
SIGNAL FROM FlXED PULSER (THROUGH D q )
3. PULSER WAVE FORMS DURING TIMING ADVANCE 4. PULSER WAVE FORMS A T END OF ADVANCE
With further increases in engine speed,
a
transition occurs in
The negative pulse from the fixed pulser balances the posi.
the wave form, such
as
from A to 6. That is. SCR
is
trig-
tive pulse from the advance pulser, causing the system t o
gered faster to advance the ignition timing.
stop advancing timing.
COMBINED SIGNAL OF
ADVANCE AND FlXED PULSERS
SIGNAL FROM
ADVANCE PULSER
-
-
-SCR TRIGGER
ADVANCE PULSER
SIGNAL FROM*
FIXED PULSER
-
TIME
Date of Issue: September. 1977
@ HONDA MOTOR CO., LTD.