VETISMAN
RC
and
SERVICE
MANUAL
1
conh-ols the chopper wheel
and fan motors.
LATED
DO
Component layout
Schematic diagram
NG
AND
AD
nshuctions are given in
G
None
Connector Xl
is
connected to the power supply
and connector X2 to pcb
MUSCU2A.
Circuit
N3
(Timer
TLC
555)
is controlled by a pulse
from thela-reader (on its falling edge). From
circuit
N3
pulses are lead to the back coupling
of the chopper wheel rotative velocity. The
chopper wheel rotative velocity
is
regulated
by circuit
Nl
(Regulator
LM723).
Rating
voltage ofrotative velocity is ea.
3V,
which is
determined
bv
resistors
RI
and
R2.
Output of
circuit Nl
is
lead, viaPTC-resistorRl4 which
prevents motor overload, to connector
X3.
Motor~otativevclocity is adjusted by trimmer
R3.
Regulating circuit N2 (Regulator
L1M1723)
holds the fanrotativevelocity steady,although
the power supply voltage +24V would vary.
Document
3511352-100-X
Release
2.0
Section
3
Page
4
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