Turn On the Computer. The words
pear on the
word "READY" and a
Monitor
POWER
1.
Turn On the Expansion Interface.
2.
Turn On the Disk Drives (Terminal Drive 26·1164A, first)
and then any
3.
Put a
into
will
of
screen along
prompt
NOTE: If an Expansion Interface
Disk Drive, hold
puter. A
screen. Press Enter key and the
pear
now in Basic mode.
RESET
Press
the Computer)toreset
Drives are attached, insert a
mation
This
DISK OPERATING SYSTEM (DOS)
Type DIR and press the Enter key
programs
and the
contains
list
programs on
To load a program from a diskette, type the nameofthe pro-
gram and press the Enter key. Use a
of the Disk Drive
no
If
NOTE: Basic program
Computer
To get back to the DOS from Disk Basic mode, type
Monitor
screen. The
UP
SEQUENCE (WHEN USING DISK DRIVE)
diskette
Disk DriveO.Turn On the Computer. The
automatically
the Disk Operating System will appear on the
character.
followed
the
Break key and the Reset
into
will
reboot the
that
numberofthe
the
number is given, the system
is in the Disk Basic mode.
screen. Press the Enter key once. The
prompt
Computerisnow
other
(containing DOS, Disk Operating System)
boot
with
down
double
"MEM
by a
Disk Drive 0 and press
Computer
are on the
Disk Drive
information
diskette
which
will
character
peripherals.
up from Disk DriveO.The version
the words "DOS READY" and a
Break key when
SIZE?"
prompt
character. The
the
ComputertoBasic mode. If Disk
diskette
from Disk Drive
to
diskette
contains
in Disk DriveO.Type
holding
desired. Example: Type DIR:2to
in Disk Drive
the programtobe loaded.
will
not load
from
SIZE?"
will
in Basic mode.
unit
is used
turning
will
appear on
word"
READY" will ap-
button
(on
containing
only
the Reset button.
display a
the
2.
colon
and the number
assume Disk Drive
diskette
will
ap·
appear on the
Computer
Monitor
without
On Com·
Monitor
Computer
right
rear
DOS infor-
O.
directory
diskette
DIR
which
unless the
CMD"S"
willbelost
DISK BASIC
To load Disk Basic
sert a
DOS diskette)
key and
DOS, type
in memory
To load a program from a diskette, type LOAD and the program name enclosed in
load from a Disk Drive
the Disk Drive number at the end
ample: LOAD "SAMS:1"
To save a program
SAVE and the program name in
key. To save a program
a
than Disk Drive 0, add a colon and the Disk Drive number at
the end
Disk Drive
is
FORMATIING
NOTE: This procedure does
System
diskette
of
containing
to
A blank
saving data. To format a diskette,
diskette
DOS diskette)
the Enter key.
of
blank
:
tions
CASSETIE OPERATION
To load a program from tape, type CLOAD (with or
the program name enclosed in quotes),
play mode and press the Enter key. Prompt
when program has been loaded.
and press the Enter key. Any program in memory
when leaving Basic mode by using
into
diskette
formatadiskette
diskette
on the
containing
into
follow
prompts. To go
CMD"S"
will
be lost.
of
the program name. Example: SAVE "SAMS:1"
1_
A DISKETIE
sections
thus
formatted
2 or more Disk Drives.
diskette
with
the format program onit(usually partofthe
into
After
into
Monitor
the Computer,
Disk Drive0,type BASIC, press the Enter
required
must
Disk Basic (usually a partofthe
and press the Enter key. Any program
quotes
other
than Drive 0, add a
for
Disk Drive
ontoadiskette
ontoadiskette
for
must
containing
be formatted beforeitcan be used
the Disk Drive, type FORMAT and press
the program has been loaded, insert a
the Disk Drive and
screen.
boot
up on DOS. In·
from
Disk Basic mode
and press
of
quotes
not
normal
be used
DOS
the
the program name.
1.
in a Disk Drive, type
and press the
in a Disk Drive
copy
Disk Operating
disk
only
Use"
Back-up"
information.
boot
up on DOS, insert a
follow
put
the Recorder in
O.
onto
To save a program
the program name enclosed in quotes), put the Recorder in
record mode and press the Enter key. A
dicate
CPU
of
nector
connections at Connector J1A and check for open
power cord. If the correct voltages are present, reconnect
the Power Supplytothe
puter. Check for 5.0V at pin 3ofRegulatorIC(Z1),
pin 3ofRegulatorIC(Z2)
Diode CR2. If all the voltages are missing, check the Power
Switch
If 5.0V is missing, check the voltages and components
associated
If the 11.9V is missing, check the voltages and components
associated
thru7,10,11and 13 of IC
the
If the - 5.0V is missing, check Resistor
CR2
MICROPROCESSOR (CPU) OPERATION
Check the 1.774MHz
processorIC(Z40).
quency, refer to the "CPU Clock and Divider" sectionofthis
Troubleshooting guide.
If the waveform is normal, check the operationofthe reset
signal at pin26of
be Low for approximately.1second when the Computer is
turnedOnand then change toand remain High. If the
reading is incorrect, check Capacitor C42, Resistor
check ICs
If the logic reading at pin25ofICZ40
(pins 7 thru10and12thru15ofICZ40) and address lines
(pins 1 thru 5 and30thru40of
When disabled the
and the address lines are Open (No
readings at the
fers, Tri-State Buffer ICs
read Open (No
Z40 is Low, check Resistor
short to ground. The data and address lines fromICZ40 can
be checked by grounding pin25of IC Z40 and checking the
logic
lights
IfICZ40
turnedOnand suddenly stops, pulses appear on data lines
then suddenly stop, check
thru Z20) by
Board. Check
Connector J1A and 23.6V between pin 4 and pin 2ofCon-
J1A. If the voltages are missing, check the cable and
(S1).
with
"Miscellaneous
with
adjustmentofthe
and check for possible short to ground.
Z52
and Z53 by
lights
readings for High on the data lines and
On) on the address lines.
appears to start operating when the computer is
substitution.
for
18.5VAC between pin 1 and pin 3
CPU
Board and turnOnthe Com-
and - 5.0V at the anodeofZener
Regulator
Adjustments".
Regulator
12V
clock
If the waveform is missingoroff
IC Z40. The
logic
inputs
and
On). If the logic reading at pin25of
Output
If the 5.0V is incor-
Output
Transistor (06) and pins 2
Z2.
If the 11.9V is incorrect, check
Adjust
Control
(R19),
waveform at pin 6 of Micro-
logic
reading at pin26should
substitution.
is Low, the data lines
IC Z40)
readings for the data lines are High
outputsofthe address line buf-
(Z22,
R58
ROM
lights
Z38,
Z39 and
and check for a possible
AlBIC(Z1B)RAM ICs
(PT1)
Transistor
Control
(R10).
Zener Diode
will
be disabled.
On). The
Z55),
for
Open (No
from
AC
11.9V at
(04),
(R5),
fre-
logic
R47
and
logic
will also
(Z13
Verify that the
for
a frequencyof10.6445MHz at pin 6ofIC
clockisoff
Capacitor C43. If the clock is not operating, check Crystal
Y1,
Capacitor C43, Resistors
by
substitution.
The 10.6445MHz
(Z56)tosupply
to
pin 6ofMicroprocessorIC(Z40).
of
1.774MHz at pin 8ofIC
or
the signal is missing, check the logic reading at pin 6
IC Z56 fora Low.Ifthe
Resistor
reading at pin 6 is Low, checkICZ56bysubstitution.
for pulses at pin 6ofIC Z40. If pulses are missing, check
Resistor
tion.
VIDEO
No video on the
emitterofthe Video
is normal, check the Video Connector (J2) forgood connection
and check the video cable.
If the waveform is missing at the
check for a video signal at pin 5ofDriverIC(Z41).Ifthe
signal is present at pin 5 ofICZ41,
components associated with Transistor 01.Ifsignal is
missing at pin5ofIC Z41, check for a video signal at pin 6
IC Z41. If the signal is present, check IC
tion. If the signal is missing from pin 6ofIC
waveform at pin 3 of IC Z30.
If the waveform is present at pin 3ofIC
reading at pin 2ofIC
tion. If the
Shift
Reg
form is
15ofShift
pins4,5,10,11 and12ofICZ10. If the waveform and pulses
are present, checkICZ10 by
Video display does not operate in the 32 character mode.
Type and run the following Basic program and check for
pulses at pins 9 and14of
10 OUT 255,8: OUT 255,0: GOTO
IC
If pulses are missing at pin 9ofIC
pins 9 and 10ofIC Z25. If pulses are missing from pin 9
IC
Z25, check Tri-State
by
substitution.
check ICs Z36, Z52 and
present at pin 9 and10ofICZ25, check ICZ25 by
tion.
If pulses are present at pin 9ofIC
of
IC Z59, checkICZ59 by
sent at pin14of IC Z59, check Mux (Multiplexer)IC(Z43)
substitution.
CPU
Clock is operating properly by checking
frequency, check 10.6445MHz Crystal
R46
and
R52
clock
is divided by six by the Divide By 61C
the 1.774MHz clock, pin 8 ofICZ56, and fed
Z56.
R67
and checkICZ42bysubstitution.
R64
and check Tri-State
logic
(Register)IC(Z11)
missing
Reg
logic
Monitor
reading at pin 2of IC
at pin 3ofIC
(Register)IC(Z10)
screen. Check the waveform at the
Output
Transistor (01). If the waveform
Z30 is Low, check IC
Flip/FlopIC(Z59).
Buffer
If pulses are
Z54bysubstitution.
substitution.
Check for a frequency
If the frequency is
reading at pin 6 is High, check
BufferIC(Z72)
emitter
check the voltages and
Z30
by substitution. If the wave-
Z30,
check the waveform at pin
and check
substitution.
10
Z59,
check
IC (Z22) and ICs Z23 and Z52
missing
from pin10of
Z59 and missing at pin
and check IC Z42
of Transistor
Z30
is High, check the
If pulses are pre-
Z42. If the
(Y1)
and
incorrect
If the
logic
Check
by substitu-
01,
Z41
by substitu-
Z41, check the
and the
Z30bysubstitu·
logic
for
pulses at
for
pulses at
IC Z25,
If pulses are
substitu-
of
("')
en
("')
en
w
3::J>
0
cO
men
r-::I:
-:J>
of
r-(')
m",
<-t
~:II
_en
-0,
of
14
by
:II
2
o
7
TROUBLESHOOTING (Continued)
VIDEO RAM
following
The
ICs (Z45 thru Z48 and
bit
each
defective
puter,
changing the word PRINT in lines 130 and 150
LPRINT.
VIDEO RAM TEST PROGRAM
5 DATA
10
Y =6:X= 15360: POKE
20
IF (PEEK
30
POKE X,160
40
IF (PEEK
50
FOR X= 15360 TO 16383
60
FOR
70
READZ:POKE X,Z
80 IF (PEEK
90 POKE
100
IF (PEEK
110 NEXT Y
120 RESTORE: NEXT X
130 PRINT "MEMORY GOOD" : END
140
IF Y= 6THEN
150
PRINT
"CHECKS BAD"
160
IF Y= 6 THEN 50 ELSE 110
Basic program can be usedtocheck
Z61
thru Z63). The program checks
of RAM and displays on the
bit
found. If a Printer is connectedtothe Com-
the
bad
bit
message can be senttothe
1,2,4,8,16,32,128
(X)AN0
(X)
AND
Y=OTO6
(X)
ANDZ)= Z THEN 90 ELSE 140
X,O
(X)
AND
Y = 7
"BIT";Y;"OF
X,64
64)=64THEN30ELSE 150
64)
= 0 THEN50ELSE 150
Z)=O
THEN 110 ELSE 140
MEMORY LOCATION";
Monitor
the RAM
screen any
Printer by
to
the word
X;
KEYBOARD
not
Keyboard is
tween Keyboard and
bon cable checks good, check
If pulses are
If a
groupofkeys are
Z1A and Z2A and Tri-State Inverter ICs (Z3A and Z4A) con-
to
nected
cable
for
If
a single key does
withanohmmeter. If the key is erratic and
operation, clean the
If a wrong character shows up on the
an alpha or numeric key is pressed, check the video RAM,
to
refer
guide
IC
CASSETIE
Computer
On the cassette motor. Type and run the
program. The program will produce the waveform shown in
Figure 1 at pin 2
Off
(K1) on the Expansion Interface Board.
the
and check Flip/Flop IC
(Z29)bysubstitution.
Motor
functioning.
CPU
missing,
the keys
open
"Video
will
Control Relay (K1) on the
check IC Z36 by
not
not
circuits.
not
contacts
RAM"
not
save programs
of
Flip/Flop IC Z59 and
Check the ribbon cable be·
Board
for
open
circuits.
for
pulses at pin11of
substitution.
functioning,
functioning.
function,
sectionofthis
(Z28)
check the pins of ICs
Also
check the key
with
a spray
Monitor
and Character Generator
onto
tape or
will
CPU
If the rib-
IC Z36.
check the ribbon
contacts
intermittent
contact
Troubleshooting
Board and Relay
screen when
will
following
toggle
cleaner.
not
turn
Basic
On and
in
The
bit
number
schematic. IF the program finds a bad bit, check the
schematic
that RAM IC by
NOTE:NoRAM IC is used
comparing
indicates
gram
IC
Z30 by
Tri-State
RAM IC
the RAM IC checks good, check the Tri-State
with
ated
VIDEO SYNC
No vertical sync. Check the waveform at pin
(Z32).
IC
substitution.
waveform at pin 8 of IC Z57. If the waveform is
8,
check
pin
C26
and C27 and check IC Z57 by
form is present at pin
No horizontal sync.Check the waveform at pin11of
Counter IC
substitution.
by
form at pin 8
check the Horizontal Center Control
C21
and
present at pin 8 of IC
No vertical or horizontal sync. Check the waveforms at pin
of
IC Z5. If the waveforms are missing, check ICZ5by
8
substitution.
R28
and
that each RAM IC produces is noted on the
for
the RAM IC that produces that
substitution.
for
bits
5 and 7
bit
6 is bad and
substitution.
Buffer
ICs
(Z44
outputs
and check ICZ6by
to the data lines. If a bad
the defective
If
the
waveform is missing, check IC Z32 by
If
the
the
Vertical Center Control
8,
(Z50).
If the waveform is
If the waveform is present, check the wave·
of
IC Z6.Ifthe waveform is
Z6,
If the waveforms are present, check Resistors
R29
and Sync Amp
bit6.Bit 6 is produced by
with
a NOR Gate IC Z30. If
bits
5 and 7 are good, check
and Z60) are usedtoconnect
bitbysubstitution.
waveform is present, check the
check IC Z5 by
substitution.
missing,
(R20),
substitution.Ifthe waveform is
check ICZ5by
Transistor
bit
bit
Buffer
11ofCounter
(R21),
substitution.
missing
Capacitors C20
substitution.
(02).
and check
the
pro-
the
is found and
associ-
missing
Capacitors
If the wave-
check IC Z50
at pin
10
FORX=1TO100
20
OUT 255,3: OUT 255,0
30
NEXT X
40
OUT 255,4: POKE 14308,0
50
at
8,
FORX=1TO100
60
OUT 255,7: OUT 255,4
70
NEXT X
80
POKE 14308,1: GOTO
If
the
Cassette
ing sound from RelayK1on the
clicking,
check
Relay
Driver IC
ween Low and High. If the
foralogic
pin 3 of IC Z41. If the
Z41, check IC
correct
reading at pin 1
pin 9
check RelayK1contacts
the
connections
K1isnot
(Z41).
reading that toggles between Low and High at
at pin3,check RelayK1and Diode CR3. If the
of
Flip/Flop IC
Figure 1
10
Motor
is not
switching
CPU
at pins 1 and 3ofConnector
clicking,
The
Z41bysubstitution.
ofICZ41
check the
logic
reading should be
logic
logic
reading is incorrect at pin 3ofIC
is incorrect, check
(Z59).
If pulses are present at pin
3.5V
5ms
OV
DC
Reference
On, listen
Board. If the Relay is
withanohmmeter
logic
reading is correct, check
If the
foraclick·
and
toggling
reading is
for
pulses at
J3. If
bet-
reading at pin 1 of
logic
9,
8
TROUBLESHOOTING (Continued)
check IC Z59 by
checkICZ25 by
If the Cassette
relay
contacts
CR9 and CRW.
If the Computer will not save programs
the waveform shown in Figure 1 at pin 2ofIC
waveform is present, check Resistors
check pin 5ofConnector J3 for good connection.ifthe
waveform is missing at pin 2ofIC
pin 9ofIC Z59. If pulses are missing, checkICZ25 by
substitution.
IC
Z59 by
If the Computer
a2Vpop,
J3. Type and run the
10
X= INT(255)
20
PRINT"X= "; X
30
OUT 255,0: GOTO 10
The number X that appears on the
255
when the 1kHz signal is injected at pin 4ofConnector
J3 and
127
rect, check for pulses at pin10ofICZ4.
ing, check the voltages and components associated
pins 1 thru14ofICZ4.
substitution.
substitution.
Motor
and check
If pulses are present at pin 9ofIC Z59, check
substitution.
will
1kHz sinewave audio signaltopin 4ofConnector
with no signal injected. If the numbersare incor-
not load a program from tape, connect
If pulses are missing at pin
runs all the time, check for
for
possible shorted Zener Diodes
onto
tape, check for
R53,
R54
and
Z59, check for pulses at
following
Basic program.
Monitor
screen should be
If pulses are miss-
sticking
Z59.Ifthe
R55
and
with
SCHEMATIC NOTES
~
Circuitry
Circuitry used in some versions
8See parts
....
Ground
Item numbers in rectangles appear in the alignment/adjust-
Supply voltage maintained as shown at input.
Voltages measured
Voltages and Waveforms taken
Terminal
Resistors are
Value in ( ) used in some versions.
not
used in some versions
list
ment instructions.
with
mode (Main
noted.Waveforms taken
SweeplTime
set forDCcoupling on
SwitchtoAC
is measured when necessary. Each waveform is 9 cm
width
withDCreference voltage given at the
of
each waveform. Time in
reading at the endofeach waveform.
title
switch
input
identification
'hWorless, 10% unless noted.
9,
If pulses are present at pin 10ofICZ4and the cassette
modification
check
pin9,check Diodes CR200 and CR201, Resistor
check ICs Z1C and Z2C by
ent at pin 9 ofICZ24, check for pulses at pins 8 and13of
Z24
and pins 9 and10ofICZ25. If pulses are missing from
pin 9ofIC Z25, check Tri-State
processor IC
pulses are missing at pin10ofICZ25,
and
Z54bysubstitution.
If
pulses are present at pins 9 and10of
at pin13of
are present at pin13ofICZ24
check IC
If pulses are present at pin 8ofIC
pin 6ofIC Z25.Ifpulses are present at pin 6ofIC
check Tri-State
missing at pin 6ofIC
Z25. If pulses are present at pin 4ofIC
substitution.
ICs Z22, Z23,
If RelayK1on the Expansion Interface Board is
ating, refertothe
shooting
digital
meter.
with
screen displayed) unless otherwise
with
in Calibrate position, scope
"0"
to view waveforms
reference voltage waveforms.
JLsec.
may
not
be found on unit.
CounterIC(Z1C)
for
pulses at pin 9 of IC Z24. If pulses are missing at