Radio Shack TRS-80 III - Mini-Disk Drive Schematic (Sheet 1)

~
N
o
N READ DATA
TP5
NOTES:
1.
ALL RESISTORS ARE 1/4 WATT, 5%
UNLESS OTHERWISE SPECIF lED.
C18,C19,C35
01
+5V
11
!
5E
221
, , +12V
@
TP4
I I , I, , +5V
A16
lK
i
"1" N INT WRT
BUSY
R19
lK
rCd?
J2
+5vl 4
C26,C30
C38,C39
GND I 3
I + I I I I , , ! 6.8 35V GND
+12VI 1
R16
lK
+5V
R17
lK
R34
l.54K .." R6l
1% lK
R35
768
1%
+12V "1"
Q2
A33
390
R32
820
LS14
N WRT (
i I -I
CA17
C20
01
+12V
+12V
Y '1'
R9
TPI
£!!.!
..... NO
+17V
----
> lK
CA2
---".,.-
--
~
CR4
I I
I
I ~
"
---------.
r
RIO ~
lK
330pfd
LS14
2F
RPI
150
2 I 6
'5V
P6 J~
+5V
12
A58
~~
7 463
HEAD 0
WHIT!
1>/\1 A I 22 I I -12E.>o v I
2. ALL CAPACITORS ARE IN MICROFARADS
UNLESS OTHERWISE SPECIF lED.
FIGURE 18. MINI-DISK DRIVE SCHEMATIC (SHEET 1)