Tektronix DAS9100 Operating and maintenance manual

I
I
TEK
CUSTOMER PRODUCT
SERVICING INFORfylATION
iublished by Tektronix Service
ldministrative Support
Syrac"Use
" I
Albuquerque
COMMITTED TO EXCELLENCE

Service Admin1strat1ve Support
October, 1883 laaue 31
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TABLE OF CONTENTS
DAS9100 CIRCUIT BOARD PACKAGING •.....••.•
DC5090/DC510 MICROPROCESSOR RESET CYCLER ••..
IDD TOUCH-UP PAINT PART NUMBERS: OLD/NEW COLORS •.
Jl6 OPERATING HINTS ••••...••
. . . 1
. . . . . 1
. . . . . . 1
OF150 LINE FUSE FAILURE MOD •.••.•
. .. . . . . . . . . 2 . . . 4
PORTABLE CARRYING STRAP NOW AVAILABLE ••
P6131 MANUAL CORRECTION P/N 070-4210-00 •.
S3200 RACK, EQUIPMENT SLIDE ASSEMBLY EXTENDER.
S3200 SAFETY, FRONT PANEL LINE VOLTAGE, M46259.
S3200 SERIES SITE LOG BOOK, 062-7232-00 •...•
S3200 2943/2944 CORRECTION FOR SIGNAL EDGE JITTER .
TDC1/TDC2 MANUAL CHANGE •
TDCl/2 SPURIOUS OUTPUT ..••.•
TV LINEARITY GRATICULES ..•...
TV MANUAL REVISIONS (JUNE, JULY)
TV MANUAL REVISIONS (AUGUST) ••••
7L14 A48A5 U1755 REPLACEMENT ..•
50M40 WRONG RESPONSE TO
11
CONFIGURE?
11
COMMAND.
401X OPTION 22/23 INSTALLATION/REPLACEMENT CHANGES •••
463X HARD COPY MOTOR IMPROVEMENTS •••••.••
468 NEW FAN FILTER REDUCES OPERATING TEMPERATURE.
. . . . . 4
5
• • 6
. . . 6
• • 7
• • 8
. . . . 5
. . .10
. • .10
.12
. . . . .12
. .13
. .13
. . .13
. . . . .14
. . . .14
.14 613 HIGH VOLTAGE MODIFICATION #50474 •.•••••
670/A, 671A, 672 COLOR TEMPERATURE MOD. . • • • .15
690SR/6942 HV POWER SUPPLY FAILURE ••
834 POWER SUPPLY AUDIBLE NOISE ••••••
1450 RF LEVEL INDICATION •••.•..••
1502/1503 DEFECTIVE CHART RECORDER PAPER.
1800 SERIES TEST STATION, SIGNAL SENSE CARD, MANUAL CORRECTION.
1910 +5V POWER SUPPLY FAILURES.
1980 PRINTER PATCH •••.•
~2465 INOPERATIVE SWEEP ••••.
4010-1 NOISY HARD COPY FIX ••••
4016-1 POWER CORD HOLDER HINT •
. . . . .15
. . . .15
• • .15
. . . . .16
. . . . .16
. .17
. . . . . .17
. . . . . . .18
. . . . . .18
. . . . . .19

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4027/27A RELIABILITY MODS TO DEFLECTION BOARD ••••••.••••••••• 19
4052/4052A/4054/4054A FIRMWARE INFORMATION ••••••..••.•••••.• 20
4054/4114/4016-l/GMA101A/GMA102A/GMA125/618 POWER SUPPLY INTERCONECT CABLE
MODI FI CATION. • • • • • • • • . • . • • • . • • • • • • • . • . . • . • . • . 20
4110/4112A/4113A/4114A FLEXIBLE DISK DRIVES TWO WIRE STRAPS •••.•.••• 22
4110/4112/4113/4114/4112 4113A/4114A/4116A PROCESSOR BATTERY MOD 511340 •• 24
4113A OPTION 9 045-0054-00 UPGRADE KIT ••••••••• ~ •••••.••.. 24
4114/4114A/4114A30/4116A/4116A30 DISPLAY CONTROLLER SHORT VECTOR MOD. • .25
4691 INSTALLATION AND SPIRAL HOSE DISPOSITION •••
• . • . 25
4691 LOW INK LEVEL DETECTION ADJUSTMENT • . • • • • • . • • • . . • • . .2b

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DAS9100 CIRCUIT BOARD PACKAGING
Affected instruments: All DAS Circuit
Boards.
A shipping package is now available in
which DAS circuit boards can be
reliably transported. It's part
number is 004-2181-00. It's
dimensions allow packaging of a
circuit board that is 17" x 7.5" which
is the size of DAS plug in modules.
This package could also accommodate
many MDP and IDD circuit boards.
w2 Issue 13-21
DC5090/DC510 MICROPROCESSOR RESET
CYCLER
serial Numbers Affected: All
The following procedure can be
very useful for cycling
microprocessor based instruments
with intermittent kernal problems.
GPIB instruments that support the
•TEST• command may not always
perform a complete power-on self
test.
From time to time it may be
useful to cycle a uP-based
instrument at a rate much
faster than the fifteen
minutes of a typical cycler.
This set-up is a convenient
way of doing it and requires
only a TGS0l (or other clock)
and a DDS0l.
Connect the trigger output of
the TGS0l through a cable,
terminator, and dual input
coupler to the inputs of the
OD501. Connect the output of
the DO501 without a terminator
through a cable and BNC-to-Ez
Hook adapter to the reset pin
of the uP in the instrument
under test.
-1-
October, 1983 laaue 31
Set the TGS0l to 1 ms and
trigger the DDS0l. The events
delay count switches will now
control the time between
resets from zero to 99 .999
seconds, in 1 ms increments.
w2 Issue 13-16
IDD TOUCH-UP PAINT PART NUMBERS:
OLD/NEW COLORS
Approximately 3 years ago, IDD changed
the colors of their products. This has
caused some confusion in determining
which products have the old colors and
which products have the new colors.
The following are three lists, one
listing the IDD products having the Tek
blue color, the second listing the !DD
products having the old gray/tan colors
and the third listing the products
having the new gray/tan colors.
Included with each list of products are
the correct color names and Tek part
numbers of the 13 oz. cans of spray
touch-up paint for each color.
Tek Blue Colored IDD Products
Tek Blue spray paint p.n. 252-0092-02
Tek 21
Tek 31
603
604A
606
607A
608
620
624
634
Tek Old Gray/Tan IDD Products
TV Gray spray paint p.n. 252-0217- 03
Tek Tan spray paint p.n. 252-0203- 04
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IDD TOUCH-UP PAINT PART NUMBERS:
OLD/NEW COLORS (CONT.)
4006
401X
402X
405X
4081
4601
461X
4623
463X
464X
466X
4905
4907
4923
4924
4952
4953
4954
4956
Tek New Gray/Tan IDD Products
Slate Gray spray paint p.n. 252-0728-00
Smoke Tan spray paint p.n. 252-0727-00
ADSOl 4925
41XX 4926
4691 4932
4695 4970
w2 Issue 13-20
Jl6 OPERATING HINTS
REF: Jl6 Manual 070-1879-00
The following article provides some
helpful hints for use of the Jl6.
This infomation can help the
technician achieve more accurate and
repeatable results when adjusting the
color temperature on color picture
monitors.
J16 Photolleter Operating
Reca.endations
Many engineering and manufacturing
areas are using Tek Jl6 photometers
for measuring CRT luminance and
setting color balance of white fields.
I have observed several problems which
seem to reoccur. The following are
some reconnendations regarding the
correct or at least improved
techniques for making these
measurements:
-2-
October, 1883 laeue 31
1) Zerofng--This fs undoubtedly the
greatest single cause of errors with
the Jl6 and can occur with any of the
probes. Due to variations in silicon
input bias current, the zero should
always be rechecked when changing
probes and when the photo-diode
temperature changes. This fs most
noticeable on r.t. powered Jl61s where
the photo-diode is positioned directly
over the r.t, power supply when plugged
into the top of the Jl6. Also when
using the r.t, power supply, continuous
operation or at least 1/2 to 1 hour
wamup is best to minimize zero drift
on the most sensitive ranges.
The Jl6 uses a mono-polar DVM circuit
which will still read 000 even when
the zero is offset in a negative
direction. This has the appearance of
non-linearity especially at low light
levels. Also the same reading will
not be obtained when changing to the
next range. To let the operator know
that it fs incorrectly zeroed, the
minus sign fs wired to indicate that
the zero fs offset in a negative
direction. To correctly zero the Jl6,
cover the sensor and adjust the zero
adjustment on the O.lX range until the
minus sign just flickers on and off.
An alternate aethod fs to adjust the
zero until a reading of typically 5 fn
the last place dfgft fs obtained.
This reading fs checked often when
using the most sensitive ranges. If
the Jl6 zeros correctly on the XO.l
range but fs incorrect on the XlOOO
range, ft fs an fndfcatfon that the
internal DVM zero needs readjustment
according to the procedure fn the
manual.
The zero procedure fs more complex
when using the J6523 1 luminance
probe--enough so that I reconnend use
of the Minolta 1 spot meter, ff
possible, rather than the Jl6/J6523.
The Minolta has auto ranging. no
zeroing required, compact size and a
display that fs visible through the
eyepiece used for sighting. The
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Jl6 OPERATING HINTS (CONT.)
trade-off fs a poorer spectral match
to the CIE photopfc response curve.
To correctly zero the J6523/Jl6
combfnatfon, cover the J6523 objective
lens and adjust the J6523 zero on the
XlOOO range. Then change to the XO.l
range and adjust the Jl6 zero. It fs
usually necessary to repeat the
procedure once or twfce as the
adjustments interact. There fs an
incompatabilfty between the J6523 and
very early Jl6's that prevents zeroing
on the XlOOO range. A simple mod kit
fs available to cure ft. The kft P/N
fs 040-0746-00, and applies to the
Jl6's below S/N 8052000.
2) Calf bration--The photopfcally
corrected J16 probes are all initially
calibrated fn the plant usfng 3000 K
tungsten-halogen white light source.
For maximum accuracy with CRT's they
should be calibrated for the
individual phosphors to be measured.
Correction factors up to approximately
101 (higher for the Mfnoltas) may be
necessary to obtain correct data due
to devfatfons from the photopic
response curve. Thfs fs most severe
in the red and blue regions where a
small absolute deviation can be a
large percentage of the actual value
due to it befng on the lower skirts of
the photopfc response curve.
Electrical Standards can provide thfs
calibration service.
· The long tenn calibration of the
probes fs very stable due to the
sflfcon photodfode and glass photopic
correction filters. Sfnce the Jl6
itself fs calibrated usfng only a
simple current source and DVM, ft fs
seldom a source of error unless
incorrectly zeroed.
I rec01111end that the J16's be
recalibrated about once a year. The
probes probably should be recalibrated
every sfx months or so--110stly because
calibration techniques are being
improved with time rather than the
likelihood of the probes themselves
-3-
October, 1883 laaue 31
changing calibration. Routine Jl6 and
probe calibration is handled through
Factory Service while special probe
calibrations are done by Electrical
Standards.
3) J6503 Modifications--As
assem"bled, the J6503 has a plastic
window and shiny blue plastic
front which can cause minor
reflections when placed directly
in contact with a CRT faceplate.
For best accuracy the plastic
window should be discarded, the
probe front painted flat black and
the probe recalibrated.
Some early J6503's had glossy black
paint on the internal baffles and no
inner black shield to reduce internal
reflections. This resulted in side
lobes and a significant difference fn
readings with and without the light
occluder often used for CRT
measurements. These can be modfffed
and recalibrated without too much
df ffi cul ty.
4) 2 1/2 Dflft Jl6's--Early Jl6's
having only 1/2 digits are dffffcult
to read accurately, when the reading
are at •20
11
or so as the +l dfgft
ambfgufty amounts to 51. -Also they
have a 12Hz count rate rather than 6
Hz as fn the 3 1/2 dfgft version.
Thfs causes the display to change
faster than the user can detect a
reading for varying lfght fntensftfes.
Both of these shortcomings were
addressed with major modfffcations at
S/N 8052000.
5) N:. Versus Battery Operatfon--
The Jl6 fs available with an Ar. power
supply installed as Option 3 or ft may
be ordered separately to replace the
battery pack as 119-0404-00. Thf s
overcomes three problems--
I) Battery lffe fs short and
recharging tfme is long,
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Jl6 OPERATING HINTS (CONT.)
2) the charging current is 1/3
of the operating current;
thus, use of the charger
during operation will not
siginificantly increase
operating time, and
3) the Jl6 zero will be most
stable on the higher
sensitivity ranges when
operated continuously.
Also, the early Jl6's used a three
pin battery charger plug that had
no strain relief and often had the
wires short or break unbeknownst
to the user.
In conclusion, recent Jl6's are
quite stable and should have good
correlation between individual
units if zeroed and calibrated
correctly. Older Jl6's can be
brought up to date relatively
easily.
w2 Issue 13-18
OF150 LINE FUSE FAILURE MOD
REF: M51508
As a result of the excessive number of
line fuse failures caused by high
transient voltages from the AC line, a
Metal Oxide Varistor (307-0415-00) has
been added to the power supply in
parallel with the spark gap
A30A2E2010.
To install the Varistor, incapsulate
it in shrink tubing (162-9031-00), lay
it on top of A30A2C2010, and solder
the Varistor's leads to the spark gap
leads.
w2 Issue 13-18
-4-
October, 1983 la-,• 31
PORTABLE CARRYING STRAP NOW AVAILABLE
A new style carrying strap is now
available, P/N 346-0199-00. It was
designed for use with the 2213/2215's,
but can be used with any portable
instrument having a standard
adjustable carrying handle, such as
the 400/300 series and 2300 series.
The illustration below shows typical
mounting and use.
.TYPICAL MOUt,mw; Of
CAM.'tlWG SlMP TO HANDLE
I - --- MCNE HANO LE OVEP.
OWE POS\T ION FOR EASE
WliEN CARI\'( \WC.
w2 Issue 13-17
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October, 1983 laaue 31
P6131 MANUAL CORRECTION P/N
070-4210-00
TDC1/TDC2 MANUAL CHANGE
RE: TDC1/TDC2 Manual 070-2754-00
On Page 6-4 of the P6131 Manual,
Figure 1, Index fl, the comp box
for the 3 Meter Probe is
incorrectly listed. It should be
P/N 206-0282-00, not 206-0283-00.
Below i~ a manual correction for the
TDC1/TDC2 Instruction Manual that deals
with specification changes for the re-
quired test equipment.
w2 Issue 13-16
TEITRONII MANUALS CHANGE INFORMATION
Date;
Product;
Manual Part Ho,;
Change Bererenae;
7/]3/83
TDC1/TDC2
070-2754-00
CS/783
DESCRIPTION
w2 Issue 13-16
•======================================================================
TEXT CHANGES
SECTION 4 CALIBRATION,
TABLE 4-1, TEST EQUIPMENT REQUIRED, me. .4.:Z
CHANGE TO READ:
ITest Modulator
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0.1 dB Flatness within channel
limits and phase noise less
than 0.2 degrees rms.
Signal Generator to drive Test
Modulator 100 MHz to 1000 MHz
with typical sideband phase
a
noise or at least -70 dBc at
100 Hz rrom the oarrier as
measured in a 1 Hz bandwidth.
Performance
Check and
Adjustment
Tektronix
Part No.
067-
0886-00
---------------------------------------------------------------------------
a
dBc = dB rererenoed to carrier
PERFORMANCE CHECI, STEP,_ part a, Page J&-16
CBAJIGE TO READ:
•• Rerer to Fig. JJ-9. Drive the teat 1t0dulator with a linearity
stairoaae signal trom a video test signal generator such aa a TEICTRONII
1,10/TSG3/SPG combination. Conneot the low phase noise signal generator to
the teat IIOdulator ext lo input. Connect the teat modulator rt
output to the 1,so-1 (SYSTEM) rt input, and make the appropriate
tront-panel oonnectiona on the 1,so-1 to oomplete the SYSTEM.
-5-

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S3200 RACK, EQUIPMENT SLIDE ASSEMBLY
EXTENDER
REF: 2943/2944 Clock Generator
070-3335-00
2941 Clock Generator 070-3126-00
Rll40 Programnable Power Supply
070-3108-00
Rl340 Data Coupler 070-3107-00
The part number for the equipment
slide assembly extender is
407-1577-00. The 407-1577-00 is for a
pair of extenders, left and right
side. These extenders are 3.56 inches
wide and 6 inches long. The extenders
are included as a sub part for the
slide assembly 351-0085-00. Normally
there should be no need to order the
extender separately. The exception to
this is when the extender is damaged
or a rack mounted equipment is bought
outside Tektronix, i.e. DEC RK05 disk
drive. The extender may be needed
because the slide assembly supplied
with other vendor equipment is usually
too short for the racks used in the
S3200 series system.
Slide Assembly 351-0085-00
Extender P/N 407-1577-00
w2 Issue 13-20
-6-
October, 1883 laaue 31
S3200 SAFETY, FRONT PANEL LINE
VOLTAGE, M46259
Reference: 2942, 2943, 2944, Rl340
Series, 1140 Series, and Rl330
Series instruments.
Line voltages are accessible.
These changes protect the service
technician from exposure to
dangerous line voltages.
Install mounting plate, switch
cover, and appropriate hardware
over toggle switches contained on
the inside of the front panels on
the above referenced instruments.
For the 2942 only, remove a
section from the right subpanel
(386-3241-00) to prevent pinching
wires when incorporating the
switch cover change.
2942 Pattern Generator Only:
Remove: 1 ea. 386-3241-00
Subpanel, front right
Add: 1 ea. 386-3241-01
subpanel, front right
All Others:
2 ea. 211-0097-00
Screw, mach. 4-40 x
0.312
1 ea. 337-3064-00
Shield, SW poly carb
1 ea. 386-4942-00
Plate, mounting
2 ea. 129-0304-00
Spacer post, l.265L,
w/4-40 TBD
Add: 2 ea. 211-0097-00
Screw, mach. 4-40 x
0.312
2 ea. 129-0304-00
Spacer Post, 1.265L,
w/4-40 TBD
(ARTICLE CONTINUED ON THE NEXT PAGE)
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S3200 SAFETY, FRONT PANEL LINE
VOLTAGE, M46259 (CONT.)
1 ea. 386-4942-00
Plate, mounting
1 ea. 337-3064-00
Shield, SW poly carb.
No update modification kit is
available for the change. Discrete
parts must be ordered. This
modification will also protect
against electrical shorting of AC
voltages to extended circuit
boards.
w2 Issue 13-16
S3200 SERIES SITE LOG BOOK,
062-7232-00
The Site Log Book provides maintenance
personnel with one common place to
record S3200 Series Semiconductor Test
System's information. All S3200
Series system models may use the Site
Log Book.
A new Site Log Book is recommended
annually for each system.
SECTION DESCRIPTIONS
The Site Log Book is divided into
eight major sections. Each section
will contain documentation concerning
one specific area of system
information.
Section I - Information
The information Section identifies
personnel for maintenance, repairs, or
other system responsibilities.
Section II - Logs
The Logs Section is for recording
system maintenance or repair calls.
This section also contains Service
Logs, which should be completed for
-7-
October, 1983 laaue 31
each service call. Documentation
related to system performance is also
included under Uptime Calculation.
Section III -Schedules
The Schedules Section contains several
types of forms to assist in
documenting and scheduling
maintenance. The Schedules Section
should be reviewed soon after the
system is installed. Prior to
finalization of a maintenance plan,
all sections should be compared. This
comparison should be done to check for
conflicts in scheduling. Different
maintenance services should not be
scheduled simultaneously.
Section IV -Configuration
The Configuration Section provides
worksheets for system inventory. The
System Inventory is broken into basic
categories. Tektronix products and
options are separate from computers
and peripherals. The OEM portion
lists many products not manufactured
by Tektronix that may be placed in an
S3200 Series System.
Section V- Software
The Software Section is a very
important part of the Site Log Book.
Because of its importance, the four
portions of this section should be
kept current at all times. Software
modifications, updates, and changes
should be documented in this section.
A system CONFIG.EDT listing, a copy of
the System Formatter, and a copy of
the System Disk directory are located
in the Software Section.
Section VI -Site Spares
System spares provide additional
support at the system site. The Site
Spares Section provides Log Out Sheets
and inventory forms. Users may desire
to use their own forms or methods to
meet their needs.
(ARTICLE CONTINUED ON THE NEXT PAGE)

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S3200 SERIES SITE LOG BOOK,
062-7232-00 (CONT.)
Section VII - General
Additional system information may be
I
filed in this section.
,1,,1
1
11
j Section VIII -Service Records
The last section of the Site Log Book
may be used to file Service Records.
w2 Issue 13-20
S-3200 2943/2944 CORRECTION FOR SIGNAL
EDGE JITTER
Ref: 2943/2944 Manual, P/N 070-3335-00
Mod #50198
Wizard's Workshop, Issue 13-8,
April 15, 1983, Pg. 9, S-3200
2943/2944 Clock Standardization
Mod #M45157.
In some 2943/2944 clock generators the
clock signal edges may vary (jitter)
between 400 ps to 1 ns. The jitter is
caused by high signal impedance,
signal sources and cross talk to
adjacent signals.
The solution is to decrease source
impedance to increase the drive
current. This will stabilize the
signal and reduce cross talk effects •.
On the Cycle Length Board 670-5383-05
change Rll3, R114, Rll5, Rll6, R132,
Rl33 from 1.BK P/N 315-0182-00 to a
270 ohm P/N 315-0271-00. Change board
P/N to 670-5383-06. On the Clock Phase
Board 670-5425-01 change R300 and R301
from a 1.5K ohm P/N 315-0152-00 to a
270 ohm P/N 315-0271-00, change board
P/N to 670-5425-02. On the Programned
Cycle Board 670-5417-01 change R211
and R212 from 1.8K ohm P/N 315-0182-00
to 270 ohm P/N 315-0271-00, change
board P/N to 670-5417-02.
The following are locations of the
changes on partial drawing of
schematic and parts layout:
-8-
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October, 1983 laaue 31
C:V~LE
CYC.L&.
PR£-'T~
PRE·T~
T~
~
T¢ 0
c.1i • ..,se.
~-
;a?o.11.
C.P.£.
CT.i:".
~ 01'1/
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CLOt.K
J []
670-5383-06
P4 Cycle Length
s,s I
I ""0 C. YC.~i;
Bu~
B17
.. .e I
.. 2~
\,-o .;2q
.. ,s I
A13
I TO .JC."7
89
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TO J"!.18
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81~
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'TO .J'31
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BU~
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(ARTICLE CONTINUED ON THE NEXT PAGE)
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S-3200 2943/2944 CORRECTION FOR SIGNAL
EDGE JITTER (CONT.)
••"• ca.aao
l,t, ...
WID'TH
u1.a,~NI,
....
111a• PIN6
~-
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Ur:. .. I
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Ul9A
ltl TlfRU i?
tt• Tlfll:U .'7
Ut&D ~IN l'I
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-------+---·-· • !..lV
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"' ! AND
~flAt~
670-5425-02
PS through Pll
Clock Phase
l
it,;n
•10
-9-
14
AZ.IC
!UO
October, 1883 laaue 31
~.itV
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oitO
ll812
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g,
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IS
it
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A.114
1&0
TIUGoG.ER
.... I
670-5417-02
Pl2 Progra11111ed Cycle
(ARTICLE CONTINUED ON THE NEXT PAGE)

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S-3200 2943 2944 CORRECTION FOR SIGNAL
EDE JI TER C NT.
These changes should only be used on
systems that have had the 2943/2944
Clock Generator standardization mod
installed. There are 040 kits
available to install the
standardization mod.
The kit P/Ns are 040-1110-00 for 7
Phase systems and the 040-1111-00 for
14 Phase systems.
With the 2943/2944 standardized any
standardized clock is a direct
replacement without having a major
reskew or calibration of system.
Without standardization replacing any
part or all of the clock my require a
major reskew or calibration of
systems.
w2 Issue 13-19
TDCl/2 SPURIOUS OUTPUT
REF: TDCl/2 Instruction Manual
070-2754-00
SAR #05211
Arecent inquiry from the Field
questioned the presence of a spurious
signal at about 31 MHz when the TDC2
was tuned to Channel 69 or 70. This
spur was about -30 down from the
fundamental which gave a total of
about -80dBm. In either case, it was
judged to be worse than other units
(TDC2's) under similar conditions, but
was not out of specs.
One of the problems encountered in
making this measurement centered
around the 067-0886-01 Test Modulator.
The signal coming out of RF OUT is
spec'd at -25dBm. However, due to the
lack of any filtering on this output,
harmonics generated by the RF Mixer
stage will be present. In the case of
Channel 69, the second Harmonic would
be at 2 XVisual Carrier+ I.F., or 2
X (801.25 + 37) or 1676.5 MHz.
October, 1883 la8&1e 31
If one assumes no harmonic attenuation
out of RF OUT, this frequency (1676.5
MHz) would be at -25dbm when it was
applied to the TDC2, and would mix
with the first L.O. in the TDC2. Due
to the input Bandpass Filter's image
rejection of 40dB, the first Mixer
would produce a signal of about -65dBm
at about 434.5 MHz. Mixing this
frequency with the second L.O. (403.75
MHz) will produce a signal at
30.75MHz, giving us the presence of a
spur.
The amplitude of this spur is
dependent upon the first IF Image
Rejection Ratio, which is spec'd at
40dB or greater for the TDC2, and the
level of harmonics coming out of the
Test Modulator, which are not spec'd.
-10-
Some places to look for cures to this
"problem" are:
---Pay close attention to balancing
the RF mixer in the Test
Modulator.
---Check cable dress in the TDC2.
---Use care when adjusting the Pin
Attenuator in the TDC, along
with the Mixer, Bandpass Filter,
IF Amp other associated areas.
---Don't use the Test Modulator to
look at Image Rejection. Follow
the procedures in the TDCl/2
manual.
w2 Issue 13-21
TV LINEARITY GRATICULES
REF: 650HR Manual 070-2646-01
670A Manual 070-2201-01
690SR Manual 070-3821-00
When adjusting the convergence of a
color monitor to meet specifications,
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Service Administrative Support
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TV LINEARITY GRATICULES (CONT.)
one is faced with a variety of
linearity graticules, color display
monitor types, and signal generators
to make a choice from. Besides having
three sizes of CRT's, there are four
major television standards,
non-television display applications,
and more than 18 signal generators
from Tektronix alone. This list is
further expanded when one considers
custom modified products or
specification/standards changes. This
article will mainly touch upon
standard applications, however, some
custom units will be discussed where
appropriate.
The following list describes the
linearity graticules currently
available for Tektronix Color
Monitors. In general, these are
plastic overlays that are designed to
be placed in front of the CRT. A
small high-intensity lamp 1s then
placed at a prescribed distance from
the face of the CRT, thereby
projecting the shadows of the various
graticule markings on to the CRT face.
Graticule P/N Instrument TV Stand.
331-0305-00
650 Series NTSC,
SECAM,
PAL-M*
331-0359-00
650 Series
PAL
331-0305-01
670 Series NTSC,
·PAL-M*
331-0359-01
670 Series
PAL
067-1054-00
690SR NTSC*
067-1055-00
690SR PAL
067-1034-00
690SR
Opt 40/48 Hi Res***
067-1034-00
6942
Hi Res***
/
3~1-0305-02-trtr 650,670,
NTSC,
1 690SR
PAL-M
331-0359-02** 650,670,
690SR PAL
October, 1883 lae&1e 31
* Some TSG12 and TSPll
generators were compatible
with NTSC Graticules due to
the number of horizontal and
vertical lines used.
** 331-0305-02 and 331-0359-02
are 35rml slides that are meant
to be projected upon the CRT
face with a slide projector
having a lens of the proper
focal length. By carefully
positioning the projector,
these slides can be used with
any display that has the
proper aspect ratio (3 to 4).
*** The 067-1034-00 graticule for
the 690SR and 6942 is for
non-TV displays using a 31 KHz
scan rate and a special
generator.
-11-
In general, those graticules that
are used for television
applications have patterns
designed for crosshatch
convergence patterns of two types.
NTSC, SECAM and PAL-Muse a 14 x
17 line configuration, while PAL
uses a 15 x 20 line configuration.
High resolution graticules such as
the 067-1034-00 use an 11 x 15
line configuration. The following
table lists convergence generators
produced by Tektronix and provides
a handy ref~rence describing the
convergence line pattern that the
various instruments produce.
14 X 17 15 X 20
11 X 15
140 141A Mod 431L 067-1039-00
142 141A Mod 7032
143 141A Mod 431S
144 141A Mod 432D
145-M 145
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Service Administrative Support
TV LINEARITY GRATICULES (CONT,)
146 TSG12(*1)(*3)
TSG2(*3) TSP11(*2)(*3)
TSP(*3)
TSG12 ( *l )( *3)
TSPll ( *2 )( *3)
TSP21(*3)
*l TSG12's produced prior to S/N
8011550 produced 14xl7 line
patterns. After S/N 8011550,
the TSG12 produced a 15x20
pattern, with a 14xl7 line
pattern available through the
remote connector. Consult the
product manual (P/N
070-2329-00) for further
details.
*2 TSPll's produced prior to S/N
8011550 produced 14xl7 line
patterns. After S/N 8011550,
the TSPll produced a 15x20
line pattern with an 8xl0
pattern available through the
remote connector. consult the
product manual (P/N
070-2664-00) for further
details.
*3 TSPl, 11, 21 and TSG2 and 12
generators have the capability
of producing large or small
square convergence patterns.
Refer to the product manuals
for further details.
TSPl
TSPll
TSG21
TSG2
TSG12
070-2621-00
070-2664-00
070-4569-00
070-2599-00
070-2329-00
From the two tables given (above),
one can readily determine which
linearity graticule is needed for
. the particular monitor and
October, 1883 laeue 31
generator that is available.
Convergence can be accomplished in
a straight forward manner using
the procedures outlined in the
display device manuals. Close
attention to detail is
reco11111ended, with particular
attention paid to the correct
physical placement of the light
source and proper adjustment of
other circuits and parameters that
directly or indirectly affect
convergence. Some of these are
horizontal and vertical scan size
and linearity, purity, and low and
high voltages.
-12-
w2 Issue 13-18
TV MANUAL REVISIONS (JUNE, JULY)
The following TV product manuals were
updated/revised as of June and July
1983.
June Revisions
TDCl and TDC2
650HR Seri es
July Revisions
SPG1/SPG2
TSG5
69M41
070-2754-00
070-2646-01
070-2104-00
070-2336-00
070-2878-00
w2 Issue 13-18
TV MANUAL REVISIONS (AUGUST)
The following television product
manuals have been revised/updated as
of August 1983:
1450, 1450-1 Instruction Manual
P/N 070-2200-01
TSG Instruction Manual
P/N 070-3782-00
w2 Issue 13-21

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7Ll4 A48A5 01755 REPLACEMENT
RE: M50713
On the Sununing Amplifier and 2nd
LO Error Amplifier Board A48A5, if
the -15V supply comes up before
the +15V supply, the current limit
in A48A5 01755 is disabled and the
microcircuit (P/N 156-0067-12)
becomes inoperative.
To prevent the destruction of
A48A5 01755, A48A5 Cl755 was
replaced with a luf capacitor and
a lOOohm resistor was added in
series with the -15V line to A48A5
01755.
If field replacement of A48A5Ul755
becomes necessary, parts
replacement kit 050-1781-00 will
provide the new microcircuit along
with parts and instructions for
installing the mod.
w2 Issue 13-16
50M40 WRONG RESPONSE TO •CONFIGURE?•
COMMAND
Serial Number: 8010100 to 8010310
Reference: UllOl
To correct for a possible erroneous
response to the CONFIGURE? query over
the GPl8 buss UllOl was reprogramed.
The new part number for UllOl is
160-1479-01.
w2 Issue 13-19
401X OPTION 22/23 INSTALLATION/REPLACE-
MENT CHANGES
REF: 021-0201-00/01 2741 Correspon-
dence Code Interface Service
Manual, p.n. 070-2280-0X
Reports have come in from the field of
the Option 22/23 interface being DOA on
installation. This would normally show
-13-
October, 1883 laaue 31
as continual erasing of the screen
after initial powering up and pressing
the page key. Turning power off and
then back on will not clear the problem
in most instances.
Investigation into this phenomenon has
found a firmware abnormality caused by
changes to the CMOS RAM mask. This
firmware abnormality will not be fixed.
The reason for this failure mode has
been found to be incorrect initial-
ization and set up parameters written
into the CMOS RAMs by virtue of the
particular way the CMOS RAM initially
powers up.
To work around this, the installation
and replacement procedures must be
changed. Any time the Processor board
is installed or replaced, the battery
backup must be disconnected before
powering up the interface. This is
easily done after installing the
interface by disconnecting JllO on the
processor board, powering up the
terminal, typing page, and then
reconnecting JllO (without powering
down) onto the Processor board. This
procedure will ensure that the menu
comes up and set up parameters can be
set correctly without hanging the
terminal in an erase mode.
If a unit requires service because it
constantly pages when the terminal is
turned on and paged, first, turn off
the terminal and disconnect JllO from
the Processor board. Wait at least
one minute for a 11 vo 1tage potential
to drain off, then power up. If the
menu does not come up, type Break 1.
If the menu still does not appear,
then there is probably a problem with
the Processor board. If the menu
comes up, then check the battery. It
may be the cause fa the problem.
Normal battery voltage .should be
be approximately 2.9 volts.
w2 Issue 13-16

Service Administrative Support
463X HARD COPY MOTOR IMPROVEMENTS
Ref: November 20, 1981 Wizard Workshop
article
11
463X: Hard Copy Unit -
Maintenance of D.C. Motors"
The 1~7-0039-01 motors used in the
463X dry silver t:opi ers have recently
been improved.
• An o-ring seal is now being used
around the output shaft of the
gearhousing to reduce leakage of
lubricant.
• A thicker gearhousing cover is also
being used to reduce leakage. Some
motors have been seen with two of
the thinner covers , one mounted on
top of the other.
• The cut on the wonn gear has been
changed to reduce heat and friction.
These changes to the motor do not
affect specifications, inventory,
documentation, etc. Therefore, the
part number of the motor does not
change.
The effective lot code for all the
above improvements is LW (December,
1983). For an explanation of the
coding of these motors, please refer to
the above referenced arti cl_ e.
w2 Issue 13-21
468 NEW FAN FILTER REDUCES
OPERATING TEMPERATURE
Serial Numbers: All
Ref: 468 Service Manual, Vol. II1
Figure 2-122
A new Air Filter for the 468 is
now being used that reduces the
internal ambient temperature by 4
degrees Centigrade. As a result
of the decrease in temperature,
the instrument will have increased
reliability. The part number for
the new filter is 378-2042-02.
-14-
October, 1883 laaue 31
PLAN OF ACTIOH:
All old filters (378-2042-00) are
to be purged. Every 468 that
comes in for service either under
warranty or billable that has the
old filter is to have the new
filter installed at no cost to the
customer.
ROTE:
When the new filter is installed,
it is possible to see a faint
image of the fan and the fan
mounting screws. When the denser
old filter is installed, nothing
can be seen behind it.
w2 Issue 13-17
613 HIGH VOLTAGE MODIFICATION #50474
Customer Serv~ce has implemented a
modification to 613 high voltage boards
to improve reliability and performance.
As a result of this mod, the 613 high
voltage board part number rolls from
670-2308-06 to 670-2308-09.
The restorer diodes CR51 and CR62 have
failed readily especially when being
soldered with a high wattage iron (see
reference above for details). To
correct this, their part number is
being changed from 152-0242-00 to
152-0107-03.
The high voltage capacitors Cl32, Cl41,
Cl42, C151, C152, C161 and Cl62 have
al so shown poor reliability. On
occasion, their failure has destroyed a
CRT by producing a phosphor burn. This
situation is improved by changing the
part numbers of these capacitors from
283-0101-00 to 283-0477-00. The -0477-
is a distinctive blue capacitor similar
to those recently modified into the
611. )J
w2 Issue 13-17

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Service Administrative Support •
670/A, 671A, 672 COLOR TEMPERATURE MOD
REF: SAR #16778
670, 671, 672 Instruction Manual
P/N 070-1445-00
670A, 671A Instruction Manual
P/N 070-2201-01
670-1 Series Instruction Manual
P/N 070-1946-00
670A-l Series Instruction Manual
P/N 070-2202-00
Mod 5224-4
Recent inputs from the Field have
indicated problems concerning setting·
up color temperatures in the 670
Series Color Monitors.
The problem centered around the proper
high and low light values, and the
inability to set all three colors up
for a proper white. With Red and Blue
set for the proper 10 IRE and 100 IRE
levels, Green had insufficient
adjustment range. This becomes
particularly apparent when the CRT is
changed due to slight changes in the
phosphors from batch to batch.
Mod 52244 has made R4201 and R4231
test selectable with a nominal value
of 5.iK ohms (P/N 315-0512-00). The
selection range is approximately -lK
ohms+ 3K ohms.
This mod will alter the Red and Blue
biases enough to allow the three guns
to track.
w2 Issue 13-21
690SR/6942 HY POWER SUPPLY FAILURE
REF: 690SR Instruction Manual
070-3821-00
690SR Opt. 40 & 48 Instruction
Manual, 070-2870-00
-15-
October, 1883 la81.1e 31
Several field failures have shown the
following symptoms:
o Burst mode (HY overload)
o Erratic or non-existant phase-lock
of the high volt output circuit
o No control through U445
If the High volt oscillator circuitry
cannot be shut down by grounding pin 9
of U445, one of the first places to
look for a problem may be a shorted
transistor at Q304. If this device is
shorted, +200 volts will be applied to
QlOO, it will start to turn on, and
will be shut off intermittently (burst
mode) by the High Volt Overload
protect circuitry due to the lack of
coincidence of the H-Deflection signal
with the High Volt oscillator.
w2 Issue 13-21
834 POWER SUPPLY AUDIBLE NOISE
REF: 48621
An audible whining noise can occur in
the power supply of the 834 due to the
low value of capacitor A4C441.
To eliminate this condition A4C441 was
changed from 270uF, 40V (290-0946-00)
to 470uF, 35V (290-0919-00).
w2 Issue 13-20
1450 RF LEVEL INDICATION
RE: 1450/1450-1 Manual
07 0-2200-01
As the result of a customer's
inquiry concerning the reason why
the RF Level changes about 3dB
between modulated and unmodulated
signals when in the SYNC TIP/AGC
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Service Administrative Support
1450 RF LEVEL INDICATION (CONT.)
mode, the following information
was provided as part of an IOC to
the field office involved.
The AGC circuit in the 1450
samples the output video and
corrects the gain of the IF
section in order to offer a 1 volt
video signal at the output
connectors. The sample points are
controlled by the SYNC TIP and
BACK p0RCH controls.
When used in the BACK P0RCH mode,
the signal (sync tip to peak
white) is corrected for the
desired output. BACK P0RCH is a
nominal voltage of O volts, and
the Sample-and-Hold circuitry uses
this point for reference.
In the SYNC TIP mode, the signal
is sampled at sync tip. The
voltage difference between sync
tip and back porch must then be
compensated for prior to the
conversion function
(Sample-and-Hold) to achieve the
desired O volt point. If this
compensation was not done, the
circuit would see a signal that
might represent sync tip to peak
white plus sync tip to back porch,
and decrease the IF gain
accordingly in order to put a one
volt video signal out.
Since sync is a normal component
of video modulation, it therefore,
follows that absence of modulation
means absence of sync, and since
the correction for sync is still
being applied to the AGC circuit,
a corresponding offset will be
reflected in the RF Level
indications. Calculations for the
14.50-1 indicate the difference to
be approximately 2.SdB between
modulated and unmodulated signals,
as observed on the front panel RF
Level indicator.
October, 1883 laau• 31
If the customer desires to measure
RF Levels with and without
modulation, BACK P0RCH is the
suggested 100de. This also assumes
that any modulating signals
applied to the RF carrier have
been properly DC restored for the
application involved. Improper DC
restoration in Amplitude Modulated
systems will increase carrier
levels, and in Frequency
Modulation systems, will increase
bandwidth consumption. Both of
these will present the broadcaster
with technical problems in his
transmitter's capability and legal
problems with his regulating
agencies.
w2 Issue 13-16
1502/1503 DEFECTIVE CHART RECORDER
PAPER
The possibility exists that some
defective rolls of chart recorder
paper (006-1658-01) may be in stock in
the Service Centers. The defect
involves the cardboard center of the
roll being slightly longer than the
width of the paper. This causes
binding of the roll in the recorder
and inability of the motor to properly
advance the paper.
Stock should be checked and purged if
necessary.
w2 Issue 13-18
1800 SERIES TEST STATION, SIGNAL SENSE
CARD, MANUAL CORRECTION
Reference:
Signal Sense Card Manual 070-3213-00
1804 Test Station Manual 070-3331-02
Schematic Diamond 57A
1805 Test Station Manual 070-3338-00
Schematic Diamond 57
(ARTICLE CONTINUED ON THE NEXT PAGE)
-16-
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1800 SERIES TEST STATION, SIGNAL SENSE
~ MANUAL CORRECTION (CONT.)
1807 Test Station Manual 070-4134-00
Schematic Diamond 48
The pin numbers on the optical iso-
lator P/N 156-0109-00 are not shown on
the schematic. On the 670-3782-00 the
!C's are U21, U22, U23, U24, U44, and
U34. On the 670-3782-01 the !Cs are
U21, U23, U24, U25, U44, and U34.
Below is a drawing of the IC pin
configuration.
~-['2-:;
I I
3...J,... 4
L __ J
156-0109-00
w2 Issue 13-21
1910 +5V POWER SUPPLY FAILURES
REF: 1910 Service Manual
070-4523-00
Two 1910's recently received in a
Service Center had the emitter lead of
Q20 shorted to ground (Schematic 14).
This was caused by the screws holding
the rackmount latches. These screws
had penetrated too far into the
chassis, shorting an adjacent cable.
Further investigation revealed the
absence of the lock washers that were
intended to be used with these screws
(see items 71 & 72 on Figure 1 in the
manua 1).
Please inspect any rackmount 1910's
for these washers and install where
necessary. Use P/N 210-0008-00. The
washer should provide adequate
clearance behind the screw, thus
preventing this type of failure.
w2 Issue 13-21
·-17-
October, 1983 laaue 31
1980 PRINTER PATCH
REF: 1980 Terminal Driver manual
070-2922-00
When a printer is attached to one of
the RS-232C ports on the 1980 with the
intention of using it as the report
generator for scheduled or
out-of-limits data, many parameters
can be defined by the operator for the
interface. The Application Programs
also predefine these parameters to a
set of default values, some with
user-definable alterations available
during initialization.
Careful attention to the default
parameters, and how they may or may
not apply to the line printer you are
using is important.
For example:
The Option 1 application firmware
puts 0.02 (20msec) into the value
for NLDLY, which is the delay that
comes after transmitting an EOL (End
of Line).
Printers such as the Tektronix 4641
require somewhat longer delays to
insure that the carriage has
sufficient time to return. In the
4641's case, a delay of about 200msec
is desirable.
In order to institute this delay as a
matter of routine power-up
initiatization, a small "patch
program" for the "START.BAS" program
can be written as shown in diagram on
the following page.
Line 1060 sets up several parameters
should a printer get selected as the
output device. The variable "I"
defines the desired delay as a
function of baud rate (BR). By
setting I equal to 600/BR, a delay of
250msec (assuming BR=2400) will be set
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