Radio Shack TRS-80 Service Manual page 130
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Also See for TRS-80:
- Reference manual (274 pages) ,
- User manual (236 pages) ,
- Service manual (199 pages)
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P20
Jl
+12V
1 10
GND
2
9
R2
1M
-
I
Rl
111
-TACH
4
2
20K
+TACH
5
1
P21
P20
J 1
+12V
GND
2
9
R2
1M
R1
20K
-TACH
4
2
+TACH
5
1
P21 ·
122
R3
1K
-
Ll
3.3µh
C1
R7
+
C2
1.0
470
LO
RB
470
C4
+
LO
R4 1K POT.
R5
1K
10
'
9_
8_
-
- -
I
I
I
I
R12
2 2K
NON-LINEAR SERVO BOARD
L1
3 3 µh
I
I
I
I
I
I
._J
8
LINEAR SERVO BOARD
Jl
P21
3
J
+ MOTOR PWR
4
2 MOTOR RTN
01
TIP 110
R13
2.2K
7
4
N MOTOR ON
R10
1K
P20
Rl 1
1, 1/2W
NOTES:
1. ALL RESISTORS ARE 1/4WATT,5%
UNLESS OTHERWISE SPECIFIED.
2. ALL CAPACITORS ARE IN MICRO FARADS
UNLESS OTHERWISE SPECIFIED.
P21
C l . - - - - - - - - - - - - - - - 1
3
3
+MOTOR POWER
01
TIP110
R12
2 2K
R11
1, 1/2W
RlO
1K
R13
2.2K
' - - - - 1 \ A A ~ - - - - ,
7
4
N MOTOR ON
J1
P20
NOTES:
1 All RESISTORS ARE 1/4 WATT, 5%
UNLESS OTHERWISE SPECIFIED.
2. All CAPACITORS ARE IN MICROFARADS
UNLESS OTHERWISE SPECIFIED.
FIGURE 19. SERVO BOARD SCHEMATIC
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