Tektronix DAS9100 User Manual

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Service Administrative Support •
4016-1 POWER CORD HOLDER HINT
Ref: 4016 Service Manual, 070-2661-00
On the 4016, the power cords that
connect to the back of the display have
a tendency to work loose and develop an
intermittent connection. This con-
dition is caused by the weight of the
power cord hanging on a quick dis-
connect type of power connector. This
condition can be alleviated by using a
Tektronix part numbered, self adhesive
cable clamp. The cable clamp, p.n.
343-0853-00, has a 1/2
11
diameter loop
and is made of nylon. It is a reuse-
able clamp, in that, it has a loop that
can be opened and closed several times
easily.
Two clamps are used per 4016 terminal.
One c 1 amp is p 1 aced above each of the
power connectors, three inches between
the clamp and connector, with the
clamp's snap opening positioned upward.
The surface on which the clamp will be
adhered shou 1 d be c 1 eaned with a
alcohol pad if the surface is dirty or
oily. After the c 1 amps are p 1 aced,
each power cord is looped upward
through its respective cable clamp and
the clamp is then closed. The cord is
then allowed to hang down. The hanging
cords now have their weight resting
mainly on the loops of the cable clamps
and not the power connectors.
w2 Issue 13-16
4027/27A RELIABILITY MODS TO DEFLECTION
BOARD
Ref: 4027/27A Service Manuals,
070-2656-00, 070-2832-00,
070-4169-00, 070-4176-00
Corporate Modification No. 45318
Corporate Modi fi cation N1.1nber 45318
fixes four reliability problems on the
-19-
October, 1883 IHue 31
4027 /27A Deflection board and corrects
a secondary failure on the LVPS. The
new Deflection board is part number
672-0748-03.
The following problems/fixes are
implemented with the -03 board.
1. Problem:
Loss of horizontal sync.
Fix:
The flyback sense resistors R291 and
R992 are changed from carbon film to
metal film. Their new part numbers
are: R291 = 323-0385-00 and R992 =
323-0165-00. The older r-esi stors
could not dissipate enough heat and
would open.
2. Problem:
At power down, high voltage spikes
on Q1102 would cause Ql102, C491 and
CR391 to break down causing loss of
horizontal deflection.
Fix:
A new diode, CR322, part number
152-0242-00, was added in series
with R324. This is done as follows:
Lift the end of R324 which connects
to the junction of C324, C322 and
R226, insert the anode end of the
new diode into this hole and connect
the cathode to the 1 if ted end of
R324.
R227 was also changed to a 41.2K otwn
resistor, part n1.1nber 321-0348-00.
3. Problem:
Characters on the screen may be
irregularly spaced.
Fix:
C215 and C313 were replaced with
closer tolerance parts (+8C>i to -2oi
changed to lC>i parts). Their new
part n1.1nber is 283-0167-00.
4. Problem:
Horizontal jitter on display screen.
Fix:
The cause of this problem was an
oscillation in the feedback loop of
the horizontal flyback. To correct
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Tektronix DAS9100 Specifications

General

Brand	Tektronix
Model	DAS9100
Category	Measuring Instruments
Language	English