Tektronix TEK 222 User manual

T
E-
SERVICE
063-0066-00
7
MANUAL
Product
Group
40
222
Digital
Storage
Oscilloscope
Preliminary
Service
THE FOLLOWING SERVICING INSTRUCTIONS ARE
FOR USE BY QUALIFIED PERSONNEL ONLY. TO
AVOID
PERSONAL
INJURY,
DO
NOT
PERFORM
ANY
SERVICING
OTHER
THAN
THAT
CONTAINED
IN
OPERATING
INSTRUCTIONS
UNLESS
YOU
ARE
QUALIFIED
TO
DO
SO.
REFER
TO
OPERATORS
SAFETY
SUMMARY
AND
SERVICE
SAFETY
SUMMARY
PRIOR
TO
PERFORMING
ANY
SERVICE.
First Printing April 1989
Tektronix.
COMMITTED TO EXCELLENCE

Copyright
©
1989
Tektronix,
Inc.
All
rights
reserved.
Contents
of
this
publi-
cation
may
not
be
reproduced
in
any
form
without
the
written
permission
of
Tektronix,
Inc.
Products
of
Tektronix,
Inc.
and
its
subsidiaries
are
covered
by
U.S.
and
foreign
patents
issued
and
pending.
TEKTRONIX,
TEK,
SCOPE-MOBILE,
and
ane
are
registered
trademarks
of
Tektronix,
Inc.
Printed
in
U.S.A.
Specification
and
price
change
privileges
are
reserved.

LIST OF ILLUSTRATIONS
LIST OF TABLES
OPERATORS
SAFETY
SUMMARY
SERVICING
SAFETY
SUMMARY
222
DSO
Preliminary
Service
TABLE
OF
CONTENTS
SECTION
1
SPECIFICATIONS
INTRODUCTION
.............
RECOMMENDED
PERFORMANCE CHECK
SCHEDULE
.................
ELECTRICAL
SPECIFICATIONS
............
VERTICAL DEFLECTION
SYSTEM
..............0.0.
ENVIRONMENTAL
SPECIFICATIONS
............
MECHANICAL
SPECIFICATIONS
............
BATTERY-CHARGER
ADAPTER
5
vias
inn
nscensegen
EXTERNAL SUPPLY
VOLTAGE
...................
FIRST TIME BATTERY
OPERATION
.................
START-UP
.................,
VIEWING
A
SIGNAL
QUICKLY
..
Page
TIPS
ON
BATTERY
CARE
......
2-2
BATTERY
REPLACEMENT......
2-3
SECTION
3
BLOCK
DIAGRAM
OVERVIEW
INTRODUCTION
.............
3-1
ACQUISITION
SYSTEM
........
3-1
TIME
BASE
..................
3-4
PROCESSOR
SYSTEM
........
3-4
DISPLAY
SYSTEM
............
3-6
BATTERY CHARGER
RECTIFIER
.................,
3-9
POWER
SUPPLY
............
3-10
SECTION
4
PERFORMANCE
CHECK
PROCEDURE
INTRODUCTION
.............
4-1
TEST EQUIPMENT
REQUIRED
..................
4-1
PERFORMANCE
CONDITIONS
................
4-1
PERFORMANCE
CHECK
INTERVAL
.............0.000.
4-1
PREPARATION
...............
4-1
INDEX
TO
PERFORMANCE
CHECK
PROCEDURE
.........
4-5
DISPLAY
CHECKS
..............
4-6
INITIAL
CONTROL
SETTINGS
...
4-6
PROCEDURE
................
4-6
VERTICAL
...............0000
0,
4-7
INITIAL
CONTROL
SETTINGS
...
4-7
PROCEDURE
................
4-7
HORIZONTAL
..................
4-11
INITIAL
CONTROL
SETTINGS
..
4-11
PROCEDURE
...............
4-11
TRIGGER
................000,
4-12
INITIAL CONTROL
SETTINGS
................,
4-12
PROCEDURE
...............
4-12

222 DSO Preliminary Service
Page
SECTION 5 ADJUSTMENT PROCEDURE
INTRODUCTION ............. 5-1
TEST EQUIPMENT
REQUIRED ...........000005. 5-1
LIMITS AND TOLERANCES ..... 5-1
ADJUSTMENTS AFFECTED BY
CIRCUIT BOARD
REPLACEMENT ............-- 5-1
PREPARATION FOR
ADJUSTMENT ...........-05. 5-1
PROCEDURE STEPS ............. 5-2
PREPARATION .............-. 5-2
ADJUSTMENTS ............5. 5-2
SECTION 6 MAINTENANCE
STATIC-SENSITIVE
COMPONENTS .............055 6-1
PREVENTIVE MAINTENANCE ..... 6-3
INTRODUCTION ............. 6-3
INSPECTION AND CLEANING .. 6-3
LUBRICATION .............5. 6-5
PERIODIC READJUSTMENT .... 6-5
TROUBLESHOOTING ........... 6-6
INTRODUCTION ............. 6-7
TROUBLESHOOTING AIDS .... 6-7
TROUBLESHOOTING
TECHNIQUES ............... 6-7
CORRECTIVE MAINTENANCE .... 6-8
INTRODUCTION ............. 6-8
MAINTENANCE
PRECAUTIONS .............. 6-8
REPACKAGING FOR
SHIPMENT ...........0.0000. 6-8
REMOVE AND REPLACE
PROCEDURES ................. 6-9
TOP CASE REMOVAL ......... 6-9
Page
PROBE REMOVAL AND
REPLACEMENT ............-- 6-9
FRONT PANEL SWITCH BOARD
REMOVAL ..........00000005 6-11
TOP PANEL SWITCH BOARD
REMOVAL.........000000005 6-11
POT BOARD REMOVAL ...... 6-11
CRT REMOVAL ............. 6-11
POWER SUPPLY BOARD
REMOVAL............0-000: 6-12
CPU/DISPLAY BOARD
REMOVAL.........000000005 6-12
ACQUISITION BOARD AND
MAIN BOARD REMOVAL ..... 6-12
ACQUISITION BOARD
REPLACEMENT ............. 6-12
ACQUISITION BOARD AND
MAIN BOARD
REINSTALLATION ........... 6-12
CPU/DISPLAY BOARD
REINSTALLATION ........... 6-12
POWER SUPPLY BOARD
REINSTALLATION ........... 6-12
CRT REINSTALLATION ....... 6-12
POT BOARD
REINSTALLATION ........... 6-12
CASE REASSEMBLY ......... 6-12
SECTION 7 OPTIONS AND ACCESSORIES
INTRODUCTION ............. 7-1
STANDARD ACCESSORIES .... 7-1
OPTIONAL ACCESSORIES ..... 7
OPTIONS .............00 00s. 74
FIELD ACCESSORY KIT
PARTS LIST .............0005 7-1
SECTION 8— REPLACEABLE PARTS

222 DSO Preliminary Service
LIST OF ILLUSTRATIONS
Figure
Page
1-1
Maximum
ac
common-mode
voltage
versus
frequency
derating
curve..............
1-5
2-1
External
Power
Input
....
0.2...
ccc
cece
cence
e
eee
eeeeeneennenes
2-1
3-1
Simplified
block
diagram
of
the
222
DSO
..........
0.
cc
ccc
ccc
eee
eee
eeees
3-2
3-2
Floating
Acquisition
System
1.2.0.0...
ccc
cece
cc
cece
eee
ee
neeeeeeunees
3-3
3-3
Processor
System
simplified
block
diagram
...........
0...
cece
eee
ccc
e
eee
eees
3-5
3-4
Display
System...
...
0.
ccc
cece
eee
cece
cece
eeennaannnnns
3-7
3-5
Battery
Charger
block
diagram
.............
cece
ccc
cece
cece
eee
eeeeeauneeeus
3-9
3-6
Power
Supply
block
diagraM
.............
cc
cece cece
eee
eee
eeneeeeeunnees
3-10
4-1
RS-232
interconnection
cable
wiring
...........
0.00
ccc
cece
eee
n
ence
eeuenes
4-4
4-2
Trigger
Jitter
CHECK...
1...
ccc
cece
cence
eee
e
eens
enetennenns
4-14
5-1
Rear
Panel
adjustments
........
0...
cece
ccc
ce
cee
cee
eeeneenenneens
5-3
5-2
Top
accessible
adjustments
.......
0...
0.
ccc
cee
cc
cece
eee
ence
eneeeneeenns
5-4
5-3
CH1
and
CH2
Input
Compensation
..............
0.
ccc
cece
cee
e
eee
e
cence
5-5
5-4
Clock
Delay
adjustment
............
cece
cece
eee
cece
eee
eceaceneeeedaes
5-6
6-1
Circuit
board
locations
........
0...
cece
cee
cece
cece
eeennnneunees
6-10
Table
Page
4-1
Test
Equipment
Required
.........
0...
cece
ce
cece
ene
e
ee
nnneeeeeennns
4-2
4-2
VOLTS/DIV
Accuracy
Settings
............
0...
ccc
ccc
ec
c
ence
unnns
4-9
6-1
Relative
Susceptibility
to
Static-Discharge
Damage
................
ccc
cece
eee
eee
6-1
6-2
External
Inspection
Checklist
.............
ccc
cece
eee
cece
cece
eeeeeeeenns
6-3
6-3
Internal
Inspection
Checklist
...........
00.
e
cece
eee
eeeeeeeuneues
6-4

222 DSO Preliminary Service
OPERATORS SAFETY SUMMARY
The
safety
information
in
this
summary
is
for
operating
personnel.
Warnings
and
cautions
will
also
be
found
through-
out the manual where they apply.
Terms in this Manual
CAUTION statements identify conditions or practices
that could result in damage to the equipment or other
property.
WARNING statements identify conditions or practices
that could result in personal injury or loss of life.
Terms as Marked on Equipment
CAUTION indicates a personal injury hazard not
immediately accessible as one reads the markings, ora
hazard to property, including the equipment itself.
DANGER indicates a personal injury hazard im-
mediately accessible as one reads the marking.
Symbols in this Manual
A Indicates where applicable cautionary or
other information is to be found. For
maximum input voltage ratings, see
the Specifications.
SERVICING SAFETY SUMMARY
FOR QUALIFIED SERVICE PERSONNEL ONLY
Refer
also
to
the
preceding
Operators
Safety
Summary
Do Not Service Alone
Do not perform internal service or adjustment of this
product unless another person capable of rendering first
aid and resuscitation is present.
Use Care When Servicing With Power On
Dangerous voltages exist at several points in this
product. To avoid personal injury, do not touch exposed
connections or components while power is on.
Iv
Disconnect power and remove the battery before
removing
protective
panels,
soldering,
or
replacing
components.

Section 1—222 DSO Preliminary Service
SPECIFICATIONS
INTRODUCTION
Performance characteristics given in the Electrical
Specifications apply when the instrument has been self
calibrated within + 5°C of the ambient temperature, has
warmed up at least 20 minutes, and is operating in an
ambient temperature between -10°C and +55°C
(unless otherwise noted).
Items listed in the Detailed Specifications are verifiable
limits that define the measurement capabilities of the
instrument.
Environmental Specifications are given and Mechanical
Specifications are given following the Electrical
Specifications.
RECOMMENDED PERFORMANCE
CHECK SCHEDULE
To ensure accurate measurements, check the per-
formance of this instrument every 2000 hours of
operation (once each year if used infrequently). If repairs
are made, affected circuits may need to be readjusted.
ELECTRICAL SPECIFICATIONS
VERTICAL DEFLECTION SYSTEM
Deflection Factor
5 mV per division to 50 V per division in a 1-2-5
sequence.!
Vertical Resolution
8-bits, 25 levels per division. 10.24 divisions of
dynamic range.'
DC Accuracy
-10°C to +55°C +3% (when the self
calibration has been
done within + 5°C of the
ambient temperature).
1Performance Requirement not checked in manual.
VOLTS/DIV Variable Control
Increases the deflection factor by 2.5 to 1.
Aberrations
+6%, -6%. 6% p-p or less.1
Measured with a 5-division reference signal, from a
50-2 source driving a 50-0 load at the probe tip.
Vertically center the top of the reference signal.
Useful Rise Time
SEC/DIVx 1.6 1
50
Rise time is limited to 35 ns by the vertical amplifier
response.
Useful Bandwidth
—S 71
SAMPLE
Timebase
put
Useful-storage bandwidth is limited to the
frequency where there are 10 samples per sine-
wave signal period at the maximum sampling rate.
This yields a maximum amplitude error of 5%. Maxi-
mum sampling rate is 10 MHz at 5 ys per division.
Accuracy at the useful-storage-bandwiath limit is
measured with respect to a 6-division, 50-kHz sine
wave.
REPETITIVE
0.5 ys/div to 50 ys/div 10 MHz.
1 ys/div 5 MHz.!
2 us/div 2.5 MHz.!
Bandwidth is limited to 10 MHz by the analog
system.
PEAK DETECT (ENV and CONT ENV acauisition
modes at 20 ps per division and slower)
Sine-wave Amplitude Capture
(5% p-p maximum amplitude
uncertainty) 1 MHz.
1-1

Specifications — 222 DSO Preliminary Service
Pulse Width Amplitude Capture
(50% p-p maximum amplitude
uncertainty). 100 ns.
A/D Converter Linearity
Monotonic with no missing codes.'
Position Control Range
+ 12 divisions.
Input Linear Range
+20 divisions.
DC Balance
0.2 division or less trace shift when switching
between VOLTS/DIV switch settings when the
ambient temperature is within +5°C of the tem-
perature at which the last self calibration was done.
INVERT Balance
0.4 division or less trace shift when switching
between INVERT and non-INVERT displays when
the ambient temperature is within + 5°C of the tem-
perature at which the last self calibration was done.
Input Current
2.5 nA or less (0.5 division or less trace shift when
switching between DC and GND input coupling with
the
VOLTS/DIV
switch
at
5
mV
per
division)".
Input R and C
Input
Resistance
1MQ
+10%.!1
Input
Capacitance
27
pF
+3
pF.!
These
R
and
C
characteristics
include
the
probe.
A Maximum Rated Input Voltage
400
V
(dc
+
peak
ac)
or
800
Vac
p-p
at
1
kHz
or
less.1
'Performance
Requirement
not
checked
in
manual.
1-2
See Figure 1-1 for voltage versus frequency
derating curve.
A Maximum Common-Mode Potential
400 V (dc + peak ac).!
A Maximum Common-Mode Ac Potential
DC-to-1 kHz 800 V peak-to-peak.!
1 kHz-to-100 kHz See Figure 1-1 for
voltage versus
frequency derating
curve.
A Maximum Potential Between Channels
800 V (dc + peak ac).!
Common-to-Ground Capacitance
Less than 150 pF.’
Common-Mode Rejection Ratio
DC-to-1 kHz 80 dB or more.1
1 kHz-to-100 kHz 60 dB or more.!
Isolation:
Channel
Signal
to
Channel
Signal
DC-to-10 MHz 80 GB or more.!
Isolation:
Channel
Common
to
Channel
Common
DC-to-1 kHz 80 dB or more.!
1
kHz-to-100
kHz
60
dB
or
more.!
TRIGGER SYSTEM
Internal
Sensitivity
0.5
division
to
20
MHz.
Level
+20
divisions.

External
Sensitivity
200
mV
to
10
MHz.
Level t2.3V.
Input
Resistance
1MQ
+10%.!1
Input
Capacitance
18
pF
+5
pF.!
Trigger Jitter
2 1 S/div to 50 ns/div (5 ns/div in X10 MAG)
x1 1/50th division +2 ns.1
X10 MAG 1/Sth division +2 ns.
HORIZONTAL SYSTEM
Range
50 ns per division to 20 s per division.'
The X10 MAG control extends the maximum sweep
speed to 5 ns per division.
Displayed Accuracy
x1 t2%.
X10 MAG +5%.1
Accuracy is over 10 divisions.
Sample Rate
NORMAL SEC/DIV ~~
PEAKDET (ENV and
CONT ENV) 10 MHz.!
REPETITIVE
50 ns/div to 1 ws/div 10 MHz.1
2 ps/div 5 MHz.1
ACCURACY 0.01%.
Sample
accuracy
is
based
on
the
accuracy
of
the
20-MHz
oscillator.
'1Performance
Requirement
not
checked
in
manual.
Specifications
—
222
DSO
Preliminary
Service
Record Length
512
data
points;
calibrated
to
50
points
per
division’.
POSITION Control Range
Start
of
the
first
division
and
end
of
the
tenth
division
can
be
positioned
past
the
center
vertical
graticule.
Displayed Trace Length
10.24 divisions.1
X-Y OPERATION
Accuracy
Same as the Vertical system.1
Useful Bandwidth
5
SEC/DIV
Hz.1
Skew Between CH 1 and CH 2
5 ns.1
RS-232 INTERFACE
Maximum
Applied Voltage
(any
pin)
25 V (dc + peak ac).1
Baud Rates
300,
1200,
2400,
9600;
0.1%
accuracy
based
on
the
microprocessor
clock.1
Signals
RD,
TD,
and
SGND.
SGND
is
connected
internally
to
EXTERNAL
TRIG
COM.
DSR
and
CTS
are
always
high,
and
DTR
and
RTS
are
ignored.1
Levels
Compatible with RS-232C.
1-3

Specifications — 222 DSO Preliminary Service
EXTERNAL POWER REQUIREMENTS
Voltage Range
Pin-to-pin
AC 16.0 to 20 Vac
at 47 to 400 Hz.!1
DC 12 to 28 Vdc.!
Either Power Pin-to-EXT
TRIG COMM or RS-232
COMM -0.5 V to 42 Vac
peak.!
Current
1 ampere maximum when charging batteries.1
Maximum Power Consumption
15 watts or 16 volt-amperes (when charging
batteries).1
INTERNAL BATTERIES
Battery
Sealed, lead-acid battery."
Charge Time
Three hours for full charge with oscilloscope not
operating."
Battery Excessive Discharge Protection
Instrument operation is automatically interrupted
when battery charge drops to 7.32 V.1
Typical Operating Time
Two hours at maximum sample rate, no trigger, and
auto shutdown defeated.
'Performance Requirement not checked in manual.
1-4
Battery Capacity versus Temperature
-15°C 20°C to 30°C 55°C
* 80% 100% 110%
ENVIRONMENTAL SPECIFICATIONS
Environmental Requirements
Instrument will meet the requirements of
Tektronix Standard 062-2853-00, Class 3.
The instruments meets all the following
MIL-T-28000D requirements for Type Ill, Class
3 equipment, except where noted otherwise.
Temperature
Operating -10°C to +55°C
(+ 14°F to +131°F).1
Nonoperating -51°C to +71°C
(-60°F to + 160°F).1
Tested
to
MIL-T-28800D,
para
4.5.5.1.3
and
4.5.5.1.4
except
that
in
para
4.5.5.1.3,
steps
4
and5
are
performed
before
step
2
(-51°C
nonoperating
test).
Equipment
shall
remain
off
upon
return
to
room-ambient
temperature
during
step
6.
Exces-
sive
condensation
shall
be
removed
before
operat-
ing
during
step
7.1
Altitude
4,570 meters (15,000
feet). Maximum
operating temperature
decreases 1°C per
1,000 feet above
5,000 feet.1
Operating
Nonoperating To 15,240 meters
(50,000 feet).1