Brother International MD-817 Service Manual - Page 81
Motor, Control, System, Block, Diagram
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MOTOR CONTROL SYSTEM BLOCK DIAGRAM 4P Fuse Source AC.3o Fuse Earth -.• T H CN4 if' BD SCR PTR C E 6P 4 5 C Base OCV TH 2 3 TH 6 D printed-circuit board 2 3 4 56 OBV if if Vf Vf if' Transformer Power supply CN Power supply +15V 050 15V +15V 0100V 15V if CP6 1AP CP3 •-•00 M +15V Photo Z V1 CN3 05 0 V Pho Pedal Speed toX igh speed CP4 Auto Speed) CP5 OBV Tack Speed O___E=F4) Low Speed OBV -15V OBV Electric Brake Photo Z • +15V +15V OBV Photo Y, JUULJU CP9 +15v if AM Base driver OBV Photo V2 COMP OCV Motor Lock Protective -15V CN5 Base Emitter - 77 -
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MOTOR
CONTROL
SYSTEM
BLOCK
DIAGRAM
Source
AC.3o
4P
Fuse
PTR
C
E
Fuse
Earth
—.•
T
H
if'
V1
CN3
Pedal
Speed
CP5
BD
SCR
6P
C
Base
OCV
D
printed
-circuit
board
CN4
2
3
4
5
6
4
5
2
3
6
OBV
if
if
Vf Vf
if'
+15V
050
Power
supply
15V
Trans-
former
CN
+15V
0
1
00V
Power
supply
15V
if
Pho
toX
if
V
igh
speed
CP4
Auto
Speed)
OBV
Tack
Speed
O
___
E=F4)
Low
Speed
OBV
—15V
Electric
Brake
CP6
OBV
Photo
Z
•
+15V
+15V
TH
M
TH
1AP
OBV
Photo
Y,
JUULJU
Base
driver
CP3
•—•00
CP9
+15v
+15V
Photo
Z
OBV
CN5
Photo
V2
Base
AM
COMP
OCV
—15V
Emitter
Motor
Lock
Protective
—
77
—