Radio Shack TRS-80 III - Page 129

INDEX
PHOTO ASSY.
<.
+5V
lS14
TP7
38
1F
38
1F
J1
8 I N INDEX
28 1N WR ITE PROTECT
04
lED
N ERASE
03
02
01
HEAD
POSITION MOTOR
ACTIVITY
BlK
N TRACK ZERO
RED
WHT
J4 P9
R48
JOO
CR18
CR20
)l-. I I 25 I 3
OUT!' +
+5V
N
y ~ I~~~~~~~i
•
TP13
TP8
+5V
N WRT ,i • .,
J4 P12
"1"
-'0
4C
74
"1"
13
11
12
~D4Co15 ,II I I 2~- T CR19 1
2614
74
lS86
+5V~'112
07
I I I 31~4 10
R64
1K
I I I I ~ " f.1'0'" '"
+12V~ 31 14 IMOTORPWR
.J: . 30 3 MOTOR GND
29 2
+5V
cn
4.7
38
+5V
J1
P8 J4
J4
NDS1
110 1 < Ii
NDS2 1121 -II
NDS31
'4
! l
NDS4 32 5
N MOTOR ON 118 I - e "I '1
N WR ITE GATE I 241 e!
TRK 99
SW.
WRT PROTECT SWITCH
NOTES:
1.
ALL RESISTORS ARE 1/4 WATT, 5%
UNLESS OTHERWISE SPECIFIED.
....
N
....
2. ALL CAPACITORS ARE IN MICROFARADS
UNLESS OTHERWISE SPEC IF lED.
FIGURE 18. MINI-DISK DRIVE SCHEMATIC (SHEET 2)