Radio Shack TRS-80 III User Manual

NOTES:
1. ALL RESISTORS ARE 1/4WATT,5%
UNLESS OTHERWISE SPECIFIED.
P20
J1
L1
J1
P21
303IJh
+12V
1 10
3
3 + MOTOR PWR
Cl
R7
+
C2
CRl
LO
470
LO
lN4002
R8
GND
470
4 2
MOTOR RTN
2
9
C4
+
01
LO
TIP 110
R3
R4 lK POT, R5
R2
1M
lK
lK
10
8_
7 4
N MOTOR ON
-
I
I
I
R1
11
1
I
-TACH
4
2
I
I
20K
1
P20
+ TACH
5
1
I
R12
R11
I
22K
1,1/2W
P21
-
I
2. ALL CAPACITORS ARE IN MICROFARADS
UNLESS OTHERWISE SPECIF lED.
NON-LINEAR SERVO BOARD
P20
Jl
R13
2,2K
RlO
lK
P21
Rll
1,1/2W
R12
22K
'----AJ\/\r-----l 7 4 N MOTOR ON
NOTES:
1
ALL RESISTORS ARE 1/4 WATT, 5%
UNLESS OTHERWISE SPECIFIED.
*-------------l 3 3 +MOTOR POWER
R9
470
1
1
I
I
I
I
,_.1
8
C6
0022
C3
01
L1
331lh
R7
470
R6 R14
150K 1M
Cl
47
I
I +
1 ~1...!:-M29~~
12 C5
0,01
,---
I ,..-.--_---1--+-1<11--0
111
C4
...-...,R".,,3------"1.""0-l 1-1 -+ ----..R,.:;5--<t
lK R41KPOT lK
J 1
~-_---~r-------O-------~-----4---------+-~---'----'\.IV\""""r---l 4 2 MOTOR RETURN
+12V
P20
GND
2
9
R2
1M
Rl
20K
-TACH
4
2
+TACH
5
1
P21·
2. ALL CAPACITORS ARE IN MICROFARADS
UNLESS OTHERWISE SPECIFIED.
LINEAR SERVO BOARD
FIGURE 19. SERVO BOARD SCHEMATIC
122

Radio Shack TRS-80 III Specifications

General

Brand	Radio Shack
Model	TRS-80 III
Category	Desktop
Language	English