OKIDATA OKIMATE 20 Technical Service Data
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Brand: OKIDATA
Category: Printer
Type: Technical service data
Model: OKIDATA EN3211 , OKIDATA OKIMATE 20
Pages: 39
TEST
EQUIPMENT
Test
Equipment
listed by
Manufacturer
illustrates
typical
or
equivalent
equipment
used by
SAMS'
Engineers to
obtain
measurements
and is
compatible
with
most
types
used by
field
service
technicians.
TEST
EQUIPMENT
(COMPUTERFACTS)
Ecjuipmerrt
B & K
Precision
Equipment
No.
Sencore )
Equipment
No.
Notes
OSCILLOSCOPE
1570A,1590A,1596
SC61
LOGIC
PROBE
DP51.DP21
LOGIC
PULSER
DP101.DP31
DIGITAL
VOM
2830,2806
DVM37,DVM56,SC61
ANALOG
VOM
277,111,116
ISOLATION
TRANSFORMER
TR1
10,1604,1653,1655
PR5
7
FREQUENCY
COUNTER
1803,1805
FC71.SC61
COLOR
BAR
GENERATOR
1211A.1251,
1260,1249
CG25.VA62
RGB
GENERATOR
1260,1249
FUNCTION
GENERATOR
3020,3011,3030
HI-VOLTAGE
PROBE
VOM/DMM
Accessory
probes
HV-44
PR-28(HV)
HP200
TEMPERATURE
PROBE
TP-28JP-30
CRT
ANALYZER
467,470
CR70
DIGITAL IC
TESTER
560,550,552
CAPACITANCE
ANALYZER
LC53,LC75,LC76
LC77
INDUCTANCE
ANALYZER
LC53,LC75,LC76
LC77
o
w
4*
s
o
o
m
POWER
SUPPLY
NOTE:
Use an
step
down contro
TROUBLESHOOTING
w
ii\3
isolation
transformer
with
when
servicing
power supply-
Disconnect
Connector CN9
from
avoid possible
damage to
Pr
voltage
that may
be
produced
Power
Supply.
Dr i ver
Board to
nter
from high
while
servicing
NOTE:
Power Supply
will not
operate properly
if
Connector CN9
is
disconnected
from
Driver
Board unless
the proper bias
and load Resis-
tors
are
connected to
Connector
CN9.
Connect a
390 ohms 1/2W
bias
Resistor
from
pin
3 to
pin
4 and
4700
ohms 1/2W
bias Resistor
from
pin 3
to pin
5 of
Connector CN9.
Also
connect a 30
ohms, 10W
load Resistor
from pin
1 to
pin 6
and a 10
ohms,
10W
load Resistor
from pin 5
to
pin 6 of
Connector CN9.
POWER
SUPPLY
DEAD
Check Fuse
F. If
fuse is open,
check
for
possible shorts
at
Bridge
Rectifier S 1
1
and
Oscillator
Transistor (01).
If
fuse is
good,
apply AC
power
and check
for 120V AC
at the AC
input pins of
SI1. If
120V AC is
missing,
check
Resistor R1 ,
Coil
LI
and Switch
SW. If
120V AC
is
present, check
for 167V
at
the cath-
ode of SIT-
If 167V
is
missing,
check
S 1
1
-
If 167V
is
present,
check
waveform
at base of
Oscillator
Transistor
(01). If
waveform
is
missing,
check voltages and
components
asso-
ciated with
01
and Regulator
Transistor
(Q2)
and check Transformer TR.
The 14.4V
Source is
missing
Diode SI2,
Capacitor C11
and
on
Transformer TR
from
pin
6
tinuity.
,
Check
Coi I L2,
check
the
winding
to pin
7
for con-
O
>
©
2
o
The 14.6V
source is
not correct
and
adjusting
voltage
Adjust
Control VR
has no
affect.
Check
voltage and
components
associated
with
Error
Amp Transistor
(03) and
Optoisolator
(PC).
Regulated 5.0V
source
is not
correct or
miss-
ing. Check 5V
Regulator
IC
(A),
Diode SI3,
Capacitors CI 4
and
CI
5
and check
winding
on
Transformer
TR
from pin 8 to pin 9
for
continu-
ity.
The -9.0V
source is
missing
at
pin
7
of
Connector
CN9
on
Driver
Board.
Check
Diode
Si4,
Capacitor
C16
and Resistor R15
on
Power
Supply Board and Zener
Diode D1
and
Capacitor
C6
on
Interface Board.
The 9.0V
source is
missing on
the
Interface
Board (cathode of
Zener Diode D2).
Check
Zener Diode D2
and
the
voltages and
components
associated with
Regulator
Transistor
(TR1)
and
Switch Transistor
(TR3).on
Interface
Board.