Roland RE-501 Service Notes page 9

JULY
11,1980
RE-501
/SRE-555
D105, 106
:
lSR-35-200
R.
HEAD
£.liEAD
2SA733- P or Q
2SG1815-OR
Q103, 106, 100
:
2SD880-Y
Q104-105, 107, 110,111
114
=
2SD571-L
MOTOR SPEED CONTROL
:
J1PC4558D
D104
:
05Z-5.6L or
680—
5.6L/EB-2
RD5.6EB2
'*206=220-5.
6eLj
HALL
IC
MOTOR operates
from separate two DC
sources
.
Switching transistors
(Q107, 110, 111, 114),
when excited by hall ICs,fire alternately
through each L the
main winding.
Back e.m.f. of L
is
rectifiered through D
(D107-110), smoothed and is fed to pin
6 of.
IClOOh.
IClOOb compares back e.m.f. with
reference voltage (from REPEAT RATE CONTROL)
and the consequent output of IClOOb varies
Q106 base bias to control the
current flowing
into the
main winding.
PS-66
109
.0
ORN
no
.
0
-
BLK
<>
111
ORN
112
YEL
113|
YEL
117V
F4
SGA 1A (008-0
26)
GRN
r -
- 1
blk
o
BLK
WHT
Power
5W
E5B-70271T
a;
Ch
kb
WHT
WHT
T2
022-089C
Terminal
Strip
PS-66
109
.6
ORN
110
BLK
c>
111
6
ORN
112
YEL
6
YEL
F4
220V
CEE
T
400mA
(0
08-
062)
RED
WHT
r
Power
5W
E5B-70293I
47
WHT
WHT
BLU
113
T2
022-089D
Terminal Strip
I
F4
240V
CEE
T
400mA
(
008 -062
RED
6-or\jc >-<y
BLK
0
WHT
0-
BLI^
Wh
Terminal Strip
T2
022-089D
9