Radio Shack TRS-80 Manuale utente
•
erv1ce
TRS·BD®
DT-1
Catalog Number 26-6050
CUSTOM MANUFACTURED IN U.S.A. BY RADIO SHACK, A DIVISION OF TANDY CORPORATION
TRS-80® DT-1
Manual
© 1982 Tandy Corporation
All
Rights Reserved
Reproduction or use, without express written permission
from Tandy Corporation,
of
any portion
of
this manual is
prohibited. While reasonable efforts have been taken in
the
preparation
of
this manual
to
assure its accuracy, Tandy
Corporation assumes no liability resulting from any errors or
omissions in this manual, or from the use
of
the information
obtained herein.
-----------TRS-BO
®
-----------
TRS-8S
DT-1
Service
Manual
26-6SSS
----------llad1elhaek
----------
----------TRS-BO
®
---------
---------llad1elhaell---------
___
.....,D-.T_-
...
1
________
TRS-BO
®
__
.....:i;;S~e.;:;.r.:.v.:.i~c~e~M~a;,;,,:;no=u
..
a_1
____
_
Table
of
Contents
l/Specifications
••••••••••••••••••••••••••••••••••••
5
2/Dissassembly
Instructions
•••••••••••••••••••••••••
?
3/Troubleshooting
Chart
•••••••••••••••••••••••••••••
11
4/Pr
inted
Circuit
Board
Layout
••••••••••••••••••••••
15
5/Parts
List
.
.............................
.
........
.
17
6/Schematic
Diagram
.................................
21
7/Theory
of
Operation
•••••••••••••••••••••••••••••••
25
-----------
llad1elhaell----------
- 3 -
DT-1
---~.....;;.
_______
TRS-BO
®
___
s...,e.;;.r.;..v,;;.ic;;;.;e:;;...:,M;:,:;a:,;n~u;;:a;;;,l
__
_
---------
lladme
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- 4 -
___
......
D
...
T._-
..
1.....
_______
TRS-BO
®
__
......
s
...
e.r
...
v
...
i
...
c
...
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....
a
...
n_u_a_1
____
_
1/
Specifications
AC
Power
Supply
Power
Requirements
Power
Consumption
Temperature
Range
Humidity
Range
non-condensing
Size
Weight
1~5-13~
VAC,
6~
Hz
2~
watts
55
to
11~
F
(13
to
43
C)
1~%
to
8~%
relative
18.5"
x
12"
x
21"
Cl7cm
x
31
cm x
53cm)
23.4
lbs
(l~.5kg)
RS-232-C
Input/Output
============================================================
Signal
Function
Pin
#
=============================================================
PG
Protective
Ground
1
TD
Transmit
Data
2
RD
Receive
Data
3
RTS
Request
to
Send
4
CTS
Clear
to
Send
5
DSR
Data
Set
Ready
6
SG
Signal
Ground
7
CD
Carrier
Detect
8
DTR
Data
Terminal
Ready
2~
============================================================
Table
1.
-----------lladte
lhaell-----------
- 5 -
---
0
-T---
1
-------TRS-BO
®
Service
Manual
RS-232-C
Serial
Printer
============================================================
Signal
Function
Pin
#
====:========================================================
PG
Protective
Ground
1
TD
Transmit
Data
.,
.J
CTS
Clear
to
Send
5
DSR
Data
Set
Ready
6
SG
Signal
Ground
7
CD
Carrier
Detect
8
DTR
Data
Terminal
Ready
2~
============================================================
Table
2.
Parallel
Printer
Interface
==========================================
=
===============
Signal
Function
Pin
#
==
=
=======================================================
Strobe
Clock
the
data
from
the
1
processor
to
the
printer
Data
~
Bit
~
LSB
of
output
data
byte
3
Data
1
Bit
1
of
output
data
byte
5
Data
2
Bit
2
of
output
data
byte
7
Data
3
Bit
3
of
output
data
byte
9
Data
4
Bit
4
of
output
data
byte
11
Data
5
Bit
5
of
output
data
byte
13
Data
6
Bit
6
of
output
data
byte
15
Data
7
Bit
7
of
output
data
byte
(MSB)
17
BUSY
Input
to
Termnal
from
Printer
21
High
indicaGes
busy
===========================================================
Table
3.
----------ltad1elhaell----------
- 6 -
________
D_T_-_1
_________________
"TFISi-E3CJ
®
____
__.s.e_r_v_i_c_e,__M_a_n_u_a_1
______
__
2/Dissassembly
Instructions
i.
Turn
the
DT-1
upside
down
on
your
work
area.
2.
Remove
the
6
screws
from
the
bottom.
3.
Rotate
the
DT-1
rightside
up.
You
must
hold
the
top
and
bottom
section
together
during
this
operation.
Leave
room
to
the
left
for
the
top
to
rest.
4.
Lift
off
the
top
section
and
lay
it
on
its
side
to
the
left
of
the
bottom
section.
The
unit
may
be
operated
in
this
position
for
test
purposes.
Further
Dissassembly
If
desired
the
top
section
may
be
separated
from
the
bottom
section.
To
do
this
unplug
the
cable
from
the
edge
connector
and
the
grounding
lead
from
the
spade
lug
ground
connector
on
the
Video
Board.
The
top
and
bottom
sections
are
now
separate.
Circuit
Board
Removal
Follow
these
steps
to
remove
the
circuit
board
from
the
bottom
section
of
the
DT-1:
1.
Unplug
the
cables
going
to
the
video
board,
the
power
supply
and
the
keyboard.
2.
Remove
the
6
nuts
and
washers
holding
the
circuit
board
to
the
bottom
section.
3.
Unplug
the
power
indicator
cable
going
to
the
keyboard
from
the
main
circuit
board.
--------------------------------nat11elhaell-------------------------------
- 7 -
_______
D_T_-_1----------------"T~!S-EICJ®
_____
s_e_r_v_1_·c.e.....,M_a_n_u_a_1
______
__
CRT
Removal.
Be
very
careful
removing
the
CRT.
It
is
fragile,
and
could
be
dangerous
if
broken.
Never
hold
it
by
the
neck.
Follow
the
steps
below.
1.
Remove
the
plug
from
the
end
of
the
neck.
Gently
pull
straight
back.
Be
careful
not
to
bend
the
pins.
Check
to
be
sure
you
haven't
shorted
terminals
or
components
mounted
on
the
plug.
2.
Remove
the
yoke
from
the
neck
by
loosening
the
clamping
screw,
then
pulling
the
yoke
straight
back.
Be
careful
to
avoid
the
pins
at
the
end
of
the
neck
of
the
CRT.
3.
To
remove
the
anode
lead,
loosen
the
plastic
insulating
cover
from
the
CRT,
then
remove
the
lead
by
pressing
to
one
side
on
the
connector
while
gently
lifting
up
on
the
other.
4.
Remove
the
2
screws
holding
the
video
board
to
the
top
section
and
set
the
board
to
one
side
to
allow
access
to
the
CRT
mounting
studs.
4.
Remove
the
4
nuts
and
washers
from
the
mounting
studs
at
each
corner
of
the
mask.
5.
Supporting
the
CRT
from
the
body
(not
the
neck)
lift
it
up
and
back
off
the
studs.
Lay
it
on
a
soft
cloth
face
down.
6.
Finally
unhook
the
spring
and
the
two
loops
of
braid
from
the
corners
of
the
CRT.
Keyboard Removal
To
remove
the
keyboard,
1.
Take
out
the
6
screws
that
hold
the
mask
to
the
bottom
section.
2.
Lift
off
the
mask
and
the
keyboard.
3.
Unplug
the
ribbon
cable
going
to
the
main
circuit
board
and
the
grounding
spade
lug
from
the
left
end
of
the
keyboard.
See
Figure
1.
-------------------------------nad1elhaell------------------------------
- 8 -
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