Radio Shack TRS-80 Service Manual page 131
Microcomputer
Hide thumbs
Also See for TRS-80:
- Reference manual (274 pages) ,
- User manual (236 pages) ,
- Service manual (199 pages)
Advertisement
N INDEX
'\jF't<..,
0'-.1
N WRITE
PROT
OUT
+5
56
R52
Q2
Q.
J3
'0
'3
Pl0
1
HEAD POSITION
MOTOA
?~
~~
.
2
>" ,
r
1.5K
A42
P'2
Q3
>~
__
/VVYVYVY'
10
A44
+'2
, 2 3 ) "
I
'7
14'
I
~
I
LS,4
b"
• 'I
) 321
.'
5
ff
un
•
I
~
__
::.J
'50
+ 5 ~
NOS'
NOS4
NOS3
27
~~
N INDEX
- -
;
~OTOR
RT LED ASSY
J:::
-
J2
-
--,
l°Fe 8;
12' •
. , .
NOS2)
,
'K
R34
+5
•
,A,4~
J3
P21
~~
MOTOR PWR
1M
R40
1.8K
MF R21
2%
I K
R54
33K~C27
2%1101011
MF
.022"'
C28
l
+12
L4
~
LM2917
,2v
~
470
A36
9
R5'
RP1·2
R5'
RPt·l
RP1·3
+5
-
!
·
'E~~=========
pe
J4
====-==-~~~~~
I
) '
I
~2:~
NC
lK
,:t~
I
+5
I
+5
R4'
4
18
'OK
"C~7
I
~
'2
'K
~
R20
2
/15
'5
I---#v"--,
Jl·18
OIR
'5r-vvv--,
J2
20
A5'
STEP
'>---
P21
J3
R37
1M
2
25 20K
TACH
-=<
f-
I 24
+TACH
-<
SWITCH
N MOTOR
WR ITE PROT
+ 5 ~
J2,24
R51
N WRITE GATE
'>---
....
~
FIGURE 21. MINI-DISK DRIVE SCHEMATIC OF NEW BOARD (SHEET 2)
Advertisement
