Test Fixture Interface - Tektronix CURVE-TRACER 576 Instruction Manual

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Maintenance-Type 576
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To replace a ceramic terminal strips, use the following
. • . .. procedure.
3. If the studs on the new ceramic strip are longer than
those on the old one, cut off the excess length before the
new strip is put in place.
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Removal.
4. Replace all components and connections. Observe the
soldering precautions given under Soldering Techniques in
this section.
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1.
Unsolder all components and connections on the
strip. To aid in replacing the strip, it may be advisable to
mark each lead or draw a sketch showing the location of
the components and connections.
2. Pry or pull the damaged strip from the chassis.
3.
If the spacers come out with the strip, remove them
from the stud pins for use on the new strip (spacers should
be replaced if they are damaged).
Replacement.
1. Place the spacers in the chassis holes.
2. Carefully press the studs of the strip into the spacers
until they are completely seated. If necessary, use a soft
mallet and tap lightly. directly over the stud, to seat the
strip completely.
Transformer Replacement. Be sure to replace only with
ad irect replacement Tektronix transformer.
Recalibration After Repair
After any electrical component has been replaced, the
calibration of the associated circuit should be checked, as
well as the calibration of other closely related circuits.
Since the Power Supply affects all circuits, calibration of
the entire instrument should be checked if work has been
done in the Power Supply or if the power transformer has
been replaced. The Performance Check and Calibration Pro-
cedure in Section 5 provides a means of checking instru-
ment operation and making necessary adjustments.
TEST FIXTURE INTERFACE
The following two tables show pertinent information about the Test Fixture Interface located on the Type
576
front
panel. This interface consists of four connectors: .J360, J361, J362, J363 (see the Test Fixture Connectors schematic in the
Diagrams section). The terminals on these connectors may be in one of two states: true or false. True and false are defined in
terms of positive logic; the true state is the more positive of two voltage levels. Table 4-10 defines the true and false states of
each usable terminal on these connectors in terms of voltage and current ranges. References to current are in terms of
conventional current flow; that is, current flowing from a positive potential to a negative potential.
'E' Blu on wht
'A' Vel on wht
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1liiiiOiilllo - · ' ' 0308
670·1023«1 A$SY
'F' Orn on wht
,,,;0305
. . . -~~ ····0307 ... , , '
'D' Vio on wht
TABLE 4-9
Explanation of the terms Sink and Source
INPUTS
Current Sinking
When terminal accepts
current from external
circuit.
Current Sourcing
OUTPUTS
Current Sinking
When terminal accepts
current from external
load.
Current Sourcing
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4-6. Component locations and wiring color codes on 2 kV
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Bndge circuit board.
When terminal supplies
current into external
circuit.
When terminal supplies
current into external
load .
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REV. JULY 1974
4-15