Tektronix 314 User manual

Toktronix, inc.
P.O. [lox 500
Beaverton, Oregon 97077

314 Service
TABLE OF CONTENTS
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SECTION 1 SPECIFICATION
Electrical Characteristics
Vertical
Horizontal System
Triggering System
Calibrator
External Horizontal lnput
External Blanking
CRT Display System
Storage System
Power Sources
Environmental Characteristics
Physical Characteristics
SECTION 2 OPERATING INFORMATION
Preliminary Information
Safety lnformation
Operating Voltage
Controls and Connectors
Front Panel
Side Panel
Rear Panel
SECTION 3 THEORY OF OPERATION
Block Diagram
Description
Vertical Amplifier
Triggering
Sweep Generator
CRT and Power Supply
Calibrator
Circuit Operation
CH 1 Preamp and Calibrator
General
lnput Coupling
lnput Attenuator
5 Division Calibrator
lnput Stage
Preamp Stage
CH
2 Preamp
General
Preamp Stage
Channel Switch
General
Diode Gates
Switching Multivibrator
Current Limiter
Delay-Line Driver
Vertical Output Amplifier
General
Delay Line
Output Amplifier
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Page
1-1
1-1
1-2
1-3
1-3
1-4
1-4
1-4
1-4
1-5
1-5
1-6

314 Service
TABLE OF CONTENTS (cont)
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SECTION 3 THEORY OF OPERATION (cont) Page
Trigger Source 3-9
Internal 3-9
Source and Coupling 3-9
Trigger Preamp and Sweep Generator 3-10
Trigger Preamplifier 3-10
Sweep Generator 3-10
Normal Triggered Mode 3-13
Auto-Triggered Mode 3-13
Single Sweep Mode 3-13
Sweep Magnification and Positioning 3-14
Ext Horiz 3-14
General 3-14
Input Stage 3-14
Output Stage 3-14
Horizontal Amplifier 3-14
General 3-14
Emitter-Follower Amplifier 3-14
Common-Base Amplifier 3-14
Output Amplifier and Output Inverter Amplifier 3-14
Storage 3-15
General 3-15
Storage Tube 3-15
Flood Guns and Collimation Electrodes 3-17
Target-Control Amplifier 3-17
Erase Generator 3-17
Enhance Generator 3-18
Auto Erase 3-18
Auto-Erase Generator 3-18
Sweep Reset Delay Multivibrator 3-18
Integrate 3-19
Power Supply 3-19
General 3-19
AC Power Input 3-19
Power Source Selector 3-20
Series Regulator 3-20
DC-to-DC Converter 3-20
Regulator Protection 3-20
Auto Turn Off 3-20
Low-Line Indicator 3-20
+6 V and -6 V Regulator 3-20
H V and Unblanking 3-20
General 3-20
High Voltage and CRT 3-20
Blanking and Unblanking 3-22
SECTION 4 MAINTENANCE
Preventive Maintenance 4-1
Cleaning 4-1
Visual Inspection 4-1
Semiconductor Checks 4-1
Recalibration 4-1
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314 Service
TABLE OF CONTENTS (cont)
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SECTION 4 MAINTENANCE (cont) Page
Troubleshooting 4-1
Troubleshooting Chart 4-
1
Troubleshooting Techniques 4-4
Corrective Maintenance 4-5
Obtaining Replacement Parts 4-5
Component Removal and Replacement 4-6
Instrument Cabinet 4-6
Storage-Time/Div Module 4-6
CRT (with power supply section of instrument in
place) 4-6
Power Supply-High Voltage Section 4-7
Interface Circuit Board (Assembly A8) 4-8
Power Supply Circuit Board (Assembly A7) 4-8
H V and Unblank Circuit Board (Assembly A6) 4-9
Storage Circuit Board (Assembly A5) 4-9
Horizontal Circuit Board (Assembly A4) 4-10
Attenuator Circuit Board (Assembly Al) 4-10
Vertical Circuit Board (Assembly A2) 4-11
Trigger Switch Circuit Board (Assembly A3) 4-1
2
Circuit Board Pins 4-1 2
Circuit Board Pin Sockets 4-1 2
Lead-End Pin Connectors 4-13
Recalibration After Repairs 4-13
Instrument Repackaging 4-13
SECTION 5 PERFORMANCE CHECK/CALIBRATION
Performance Check
Introduction
Using the Procedure
lndex
Partial Procedure
Control Settings
Test Equipment Required
Special Calibration Fixtures
Calibration Equipment Alternatives
lndex to Performance Check
Power Supply and Display
Vertical System
Horizontal System
Triggering System
Storage System
Miscellaneous
Calibration Procedure
Calibration Interval
Tektronix Field Services
Using the Procedure
lndex
Calibration Procedure
Partial Procedure
lndex to Adjustment Procedure
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314 Service
TABLE OF CONTENTS (cont)
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SECTION 5 PERFORMANCE CHECK/CALIBRATION (cont) Page
Power Supply and Calibrator 5-18
Display 5-20
Storage 5-22
Vertical System 5-24
Horizontal System 5-28
SECTION 6 ELECTRICAL PARTS LIST
SECTION
7 DIAGRAMS
SECTION
8
MECHANICALPARTSLISTAND ILLUSTRATIONS
CHANGEINFORMATION
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LlST OF ILLUSTRATIONS
Figure No. Page
Sony-Tektronix 314 Storage Oscilloscope
Dimensions
Locations of controls and connectors Front Panel
Locations of controls and connectors Side Panel
Locations of controls and connectors Rear Panel
Basic Block Diagram
CH
1 Preamp Circuit Block Diagram
CH
2 Preamp Circuit Block Diagram
Channel Switching Block Diagram
Signal Path, CH
1
Signal Path, CH 2
Vertical Output Amplifier Block Diagram
Trigger Source Block Diagram
Sweep Generator and External Horizontal Block Diagram
Horizontal Amplifier Block Diagram
Storage Block Diagram
Power Supply Block Diagram
CRT
& H V Block Diagram
Troubleshooting Chart
Location of Power Supply Test Points
Location of Connectors
Location of Screws HoldingPowerSupply Section to Main Chassis
Location of 8-Pin Connector in Power Supply
Location of Hexagonal Spacers on Interface Board
Location of Screws Holding Heat-Sink Bracket
Location of Screws Near Focus and Intensity Controls
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REV. A, AUG. 1975

31 4 Service
LIST OF ILLUSTRATIONS (cont)
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Location of Screws on Power Supply Section 4-9
Location of Screws Holding Storage Circuit Board to Module 4-9
Location of Screws Holding Horizontal Circuit Board to Module
Assembly 4-10
Locationof Interconnectingand GroundLeadsBetweenAttenuator
and Vertical Circuit Boards 4-11
Location of Screws Holding Attenuator Circuit Board to Chassis 4-11
Location of Delay Line Leads 4-11
Location of Screws and Spacers Holding Trigger Circuit Board 4-12
Idealized Display of Risetime 5-8
Calibration Shield in place on 314 5-26
Typical display of correct adjustment of C1 or C11 5-26
Display of correct high-frequency compensation (idealized) 5-27
Typical display of external XI0attenuatorcompensation (idealized) 5-29
Semiconductor Lead Configurations
Circuit Board Locations
Adjustment Locations
Adjustment Locations
Adjustment Locations
Adjustment Locations
Al-Attenuator Board
A2-Vertical Amplifier Circuit Board
A3-Trigger Switch Circuit Board
A4-Horizontal Circuit Board
A5-Storage Circuit Board
A7-Power Supply Circuit Board
A8-Interface Circuit Board
A6-H V and Unblanking Circuit Board
AS-Intensity Limit Circuit Board
LIST OF TABLES
Table No.
1-1 Characteristics
2-1 Power Cord color codes
3-1 Sweep Generator IC Input-Output
4-1 Voltage and Ripple Tolerances
5-1 Test Equipment
5-2 Volts/Div Accuracy
5-3 Time/Div Accuracy (unmagnified)
5-4 Time/Div Accuracy (magnified)
5-5 Trigger Levels
5-6 Volts/Div Compensation
Page
1-1
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REV. B, FEB. 1976

Fig. 1-1. $my-Toktronix 314 Storb$$@ Oscilloscope.
314 Service

Section 1-314 Service
SPECIFICATION
The Sony-Tektronix 314 is a dual-channel, 10
megahertz, portablestorageoscilloscope.Theinstrument
isconstructed to withstand awide rangeof environmental
conditions.
Dc to 10 megahertz vertical bandwidth provides
calibrated deflection factors from 1 millivolt to 10
volts/division.
The horizontal system provides calibratedsweep rates
from 5 seconds to 1 microsecond/division and a XI0
sweep magnifier to increase the fastest sweep rate to 0.1
microsecond/division. Three sweep modes are available:
AUTO, NORM, and SINGLE SWP. The trigger circuit
provides a stable display over the full bandwidth.
External horizontal inputprovidesdeflection factors of
20 millivolts to 2 volts/division for external sweep signal.
The crt is a direct-view, bistablestorage device having
an 8xlodivisioninternalgraticule.Eachgraticuledivision
equals 0.25-inch. An enhance mode increases single-
sweep writing rate.
The internal 1 kilohertz calibrator is connected inter-
nallytothevertical inputsand to afront-panel connector.
The 314 operates from a line voltage of 100, 115, 120,
200, 230, or 240 volts ac, or from a +12- or +24-volt dc
source. The following tables contain a detailed listing of
the 314 characteristics.
TABLE 1-1
Electrical Characteristics
Deflection Factor
Characteristic
Calibrated Range
Accuracy
Uncalibrated Range
(VOLTS/DIV VARIABLE)
VERTICAL
Performance Requirement
Frequency Response
Supplemental Information
Bandwidth
Direct Coupled,
4-div reference
Capacitively Coupled,
4-div reference
Step Response
Risetime, 4-division
Step Input
1 mV to 10 V/Div
Within 3% over the calibrated range
Continuously variable between calibrated
deflection factor settings. Extends
highest deflection factor to at
least 25 V/Div.
13 steps in a 1-2-5 sequence
REV. A. AUG. 1977
1 mV to 10 V/Div with
VARIABLE at CAL
1 mV to 10 V/Div with
VARIABLE at CAL
Without Probe
At least
10 MHz
10 Hz or less
to at least
10 MHz
36 ns or less
With P6149 Probe
At least
10 MHz
1 Hz or less to
at least
10 MHz
1 mV to 10 V/Div

Specification-31 4 Service
TABLE 1-1 (cont)
Capacitively Coupled (AC)
Supplemental Information
- - -
Characteristic
Maximum Input Voltage
Direct Coupled (DC)
lnput R and C
Resistance
-- -- - - - -
Performance Requirement
Without Probe I With P6149 Probe
1 Mn,within 2% 10 Mn,within 2%
300 V, dc plus
peak ac
Capacitance
1 47 pF. within 4 pF 13.5 pF or less 1
500 V, dc plus
peak ac
Signal Delay Permits viewing leading edge of
waveform that initiates trigger
HORIZONTAL SYSTEM
Chopped Repetition Rate
Sweep Time/Div
Calibrated Range
Accuracy
Unmagnified
5 s to 0.5 s/Div
0.2 s to 1ps/Div
Magnified
0.5 s to 50 ms/Div
20 ms to 0.5 ps/Div
0.2 ps and
0.1 pslDiv
TIME/DIV Variable
1-2
Approximately 100 kHz
5 s to 1ps/Div. XI0 magnifier
extends sweep time/div to 0.1 ps
Within 4% over center
8 graticule
divisions. Within 5% over any
2
division interval within center
8 divisions.
Within 3% over center
8 graticule
divisions. Within 4% over any 2
division interval within center
8 divisions.
Within 5% over center
8 graticule
divisions. Within 6% over any 2
division interval within center
8 divisions.
Within 4% over center
8 graticule
divisions. Within 5% over any
2
division interval within center
8 divisions.
Within 5% over center
8 graticule
divisions. Within 6% over any 2
division interval within center
8 divisions, excluding first and
last 2 divisions of magnified sweep.
At least 2.51
21 steps in a 1-2-5 sequence
REV. A, AUG. 1977

Specification-31 4 Service
TABLE 1-1 (cont)
I
CALIBRATOR
I
Output Voltage
From +20°C ($68"
F)
to + 30" C (+86" F)
Repetition Rate
0.5 V, peak-to-peak within
1%
1 kHz, within 250 Hz

Specification-314 Service
TABLE 1-1 (cont)
Deflection Factor
I
Characteristic
Horiz Gain X10, Atten 1X
1 -20 mV/Div
I
Horiz Gain XI,Atten 1X I =200 mV/Div I
EXTERNAL HORIZONTAL INPUT
Performance Requirement Supplemental Information
Horiz Gain X10, Atten 10X
Horiz Gain XI,Atten 10X
-200 mV/Div
=2 V/Div
Input Resistance -1 Mn
Input Capacitance
Sensitivity
1 +5 V to C20 V (direct coupled)
-62 pF
Bandwidth
Variable Range
DC to at least 200 kHz
At least 10:l
CRT DISPLAY SYSTEM
EXTERNAL BLANKING
Usable Freqency Range
Maximum Input Voltage
CRT
Graticule Area 8 x 10 divisions (1/4-inch/div)
100 kHz or greater
50 V dc plus peak ac
Graticule Type Internal, non-illuminated
Phosphor
Erase Time
P44
STORAGE SYSTEM
Stored Writing Speed at
0.2 mA Cathode Current
Storage Time
Normal
=4 hours, maximum recommended
At least 80 divlms (50 cmlms)
Enhanced
I
Auto Erase
Viewing Time <1 sec to 25sec

Specification-31 4 Service
TABLE 1-1 (cont)
POWER SOURCES
Characteristic
-ine Voltage
Regulating Ranges
115 V
Low (LO)
Medium (M)
--
High (HI)
Performance Requirement
230 V
Low (LO)
Medium (M)
High (HI)
Supplemental Information
-ine Frequency
Vlaximum Power Consumption
!xternal DC Voltage
Range
+12 V
+24 V
vlaximum Input Current
+12
v
29 W at 115 V, 60 Hz (M position)
Full Intensity in stored mode
Environmental Characteristics
Characteristic
1 Performance Requirement Supplemental lnformation
lltitude
Operating
remperature
Operating
Non-operating
To 20,000 feet. Maximum allowable
ambient temperature decreased by
1"C/1,000 feet from 5,000 feet
to 20,000 feet
Non-o~eratina
I I To 50.000 feet
-1 5"C to
+ 55" C (+5" F to + 131" F)
-40" C to +75" C (-40" F to +167" F)

Specification-31 4 Service
TABLE 1-1 (cont)
5 cycles (120 hours) of MIL-I-6181D.
Omit freezing and vibration. Post
test after drying period at +25"C,
t5"C at 20% to 80% relative
humidity
Performance Requirement
15 minutes along each of the 3
major axes at a total displace-
ment of 0.025-inches, peak-to-
peak (4 g's at 55 cycles/sec) with
frequency varied from 10 to 55 to
10 cycles/sec in 1-minute cycles.
Hold for 3 minutes at 55 cycles/
sec. All major resonances must
be above 55 cycles/sec
Supplemental Information
30 g's, 1/2 sine, 11 ms duration, 2
guillotine-type shocks per axis for
a total of 12 shocks
150 kHz to 1000 MHz
1 hour slightly in excess of 1 g
30 inches on any corner, edge or
flat surface
Physical Characteristics
-
Net, wlthout accessories
10 pounds (4 7 k~lograms)
Shlpplng, Domest~c 19 4 pounds (88 k~lograms)
Characteristic
Warmup Time
I See Fig 1-2.
Performance Requirement Supplemental Information
At least 5 minutes

Specification-314 Service
FRONT
VlEW
SIDE
VlEW
1824-13
Fig. 1-2. 314 dimensions.

This Document was scanned from the original
Tektronix Service Manual
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Section 2-314 Service
OPERATING INFORMATION
NOTICE
The 314 automatically reduces the display Intensity level when sweep speeds of 10 ms and
slower are selected. This reduces the posslblity of accidentally burning the sensitive storage crf
phosphor at slower sweep speeds.
Whenchanging from sweep speed settlngs faster than
10 ms to 10 ms and slower, readjust the
INTENSITY control setting as necessary for a visible display.
PRELIMINARY
INFORMATION
To effectively operate this instrument, the user should
become familiar with its operation and capabilities. This
section describes briefly the front, side, and rear-panel
controls and connectors.
Safety Information
This manualcontainswarning informationthattheuser
must follow to ensure safe operation of the instrument.
Warning information is provided to protect the user.
Caution information is providedto protect the instrument
and connected test equipment.
This instrument is intended to be operated from a
single-phase, earth-reference powersource having
one current-carrying conductor (the neutral con-
ductor) near earth potential. Operation from power
sources where both current-carrying conductors
are live with respect to earth (such as phase-to-
phase ona three-wire system) is notrecommended,
sinceonly the liveconductorhasover-current(fuse)
protection within the instrument.
This instrument has a three-wire power cord with a
three-terminal polarized plugfor connectiontothe power
source and safety earth. The safety-earth terminal of the
plug is directly connected to the instrument frame. For
electric-shock protection, insert this plug only into a
matingoutlet withasafety-earth contact. Ifan outletwitha
safety-earth contact is not available, connect the instru-
'ment frame to a safety earth system. The color coding of
the cord conductors is in accordance with recognized
standards given in Table 2-1.
TABLE 2-1
Grounded (Neutral) / Blue 1 White
Power Cord Conductor Identification
Grounding (Earthing) 1 Green-Yellow I Green-Yellow
Operating Voltage
The 314 has a voltage selector switch (on rear panel)
that permits selection of either a 115- or 230-volt nominal
linevoltage source.To changethe voltageselector switch
position, disconnect the power cord and use a small
screwdriver to set the selector to the desired range.
Alternate ColorConductor
CONTROLS AND
CONNECTORS
Figures2-1, 2-2 and 2-3 show front,side,and rear panel
controls and connectors. A brief description of each
control and connector is given. For detailed operating
information, refer to the 314 Operators Manual.
Color
Front Panel (Fig. 2-1)
Display
1. FOCUS, INTENSITY-These are adjusted for a
sharp, bright display. Pull INTENSITY to turn instrument
power on.
2. .5
V CAL OUT-A source of 0.5-volt square-wave
calibration signal.
Unarounded (Line)
3. LOW LINE-This indicator flashes when the power
supply goes out of regulation due to low power-line
voltage or low dc supply voltage. The Indicator is on
steady for normal supply voltages (pilot light).
Trigger Source
Brown
4. AC-With this button pushed in, dc signal com-
ponents are rejected and trigger signals below about 30
hertz are attenuated.
Black
5. AC LF REJ-With this button pushed in, dc signal
components are rejected and trigger signals belowabout
50 kilohertz are attenuated.
NOTE
When both the AC and AC
LF REJ buttons are
pushedin(EXT DC), alltriggersignals fromdc to
10
megahertz are accepted if their amplitude is within
the ranges specified in Table
1-1.
REV. B, AUG. 1976

Oporntit~g Irifortn~tion 314 Sorvico
Fie. 2-1. Locations of controls and connectors frotit panel.
G
IN'I' With this biittonp~tshed ~fi, thetrlggersignal IS
obtaittcd from the vettical deflection system (CM 1 orCI i
2, or tsothf Whoii the biitton is out, the trig~orsigi-taf is
oilta~nedfrom the
I X T 'I'iliG Of3 t iOf!I/: INl~JTconnector
tf the A1.l'EN-LlNf. ts 111 the Al'i'TN XI-XfO position
i'. i.t:Vf". 'Ithis control selects the signal amplitt~cfe
on which tho sweep
IS triggered
8 SL OW l"i?~scontrol selects tho slopeof the stgnal
on
W/IIC~ ftie triggerif?g occtirs positive~g~tng
f ' ) or
negative c~oirtcj
( )
Vertical Modes
9. Cf lOP inChop Mock,sigtwlsfrom bothct?annols
are tj~splayoclsi~t~uftaneot~sly,cfiiai trace. '1"Iio dtsplay is
swrtched botwcer-1channels at
a 100 kiloherftr rate.
10 Al T In Alfort-iato Mode,sigtialsfrorrl bothvertical
cfiar~itelsaredispiayecf alternately, cfualtrace 'f'tto display
isswitct~ecfafter each sweep
11, Ct 1 I This btrtton selects ctmnel 1 vertical ~iif~ut
for disj-tlay.Chatinoi
1 IS the triggering signal.
I? CI I ? '!%is button selects ct~tanr?cl 2 vottical inpitt
for display Ch8nitcl 2 is tho triggering signal
13 Ci I 2 INVW l' f'l~slliflg thts button itt invcrts
cfiartnel
? Input signal (invetts cftspfayf
14 Ct i I VOi. I^Si'I)l\f
I tris control solocts calibuatod
deflection factors ftot?t
1 rttVif3fV to 10 VIOIV ina 1 .?-5
sequence.

Operating Information-314 Service
15. CH 2VOLTS/DIV-This control selects calibrated
deflection factors from 1 mV/DIV to 10 V/DIV in a 1-2-5
sequence.
16. CH 1POSITION-This control vertically positions
the channel 1 display.
17. VARIABLE-When this control is out of the CAL
position, it provides uncalibrated deflection factors
between calibrated steps. It extends the uncalibrated
range to 25 V/DIV.
18. lnput Coupling lndicator and switch, channel 1.
AC-out position. Blocks dc component of input
signal.
GND-middle position. The channel vertical amplifier
input is grounded.
23. ENHANCE LEVEL-This control adjusts the
single-sweep stored writing speed.
24. STORE-With this button pushed in, the instru-
ment is in storage mode. When the button is out, the
instrument is in non-storage mode.
25. ENHANCE-Pushing this button in increases the
single-sweep writing speed.
26. AUTO ERASE-With this button pushed in, an
erase occurs after each sweep, when both AUTO and
NORM buttons are pushed in.
27. ERASE-Pressing this momentary contact switch
erases the stored display.
28. INTEGRATE-This is a momentary contact but-
ton.Onrepetitivesignal,partsof whicharetoofast tostore
normally,hold the button into permitachargeto build up
on the target before the signal is stored.
DC-in position.All components of the inputsignal are
presented to the vertical amplifier input.
Horizontal
19. CH 2 POSITION-This controlvertically positions
the channel 2 display.
20. VARIABLE-When this control is out of the CAL
position, it provides uncalibrated deflection factors
between calibrated steps. It extends the uncalibrated
range to 25 V/DIV.
21. lnput Coupling Indicator and switch, channel 2.
AC-out position. Blocks dc component of input
signal.
GND-middle position. The channel vertical amplifier
input is grounded.
DC-in position.All components of the input signal are
presented to the vertical amplifier input.
Storage
22. VIEWING TIME-This control adjusts the viewing
time fromabout 1secondaftertheendof sweep toabout5
seconds after the end of sweep.
29. TIME/DIV-This switch selects calibrated sweep
ratesfrom 5seconds to 1microsecond/division, in a1-2-5
sequence.
30. Variable-When this controlisout of CAL position,
it varies theTime/Div between calibratedsteps.The range
isat least2.5X.TheUncalibratedsweep rate isextended to
at least 12.5 seconds/div.
31. AUTO-With this buttonpushed in,the sweep free
runs in the absence of a trigger signal.
32. NORM-With this button pushed in, the sweep
generator requires a trigger signal to generate
a sweep.
NOTE
With AUTO and NORM buttons both in, the sweep
runs one time on the first triggering event after
pressing RESET button.
33. POSITION-This control positions the display
horizontally.
34. SWEEP MAG-When set to X1 the sweep is
unmagnified. In the XI0 position, the horizontal gain