Options—465B
Service
Option 07
Start-
Stop
Switch
The capacitors
in the Turn-Off and Start circuits are
discharged by section A
of Si 601 when the switch is set
to
the
off (stop) position. This
ensures the correct time
constants when
S1601 is changed
to the on (start)
position.
I n the start position, the
dc i nput is applied to the
inverter
circuitry by
S1601.
section
A. At the same time
S1601 section B is closed, completing
the feedback loop
for
the inverter transistors.
S1601 section B stops
the
inverter in the
off position by opening
the feedback loop
between T14500
and T1631.
Power-Mode
Switch (SI
665)
Sections A and F
of S1665 connect filter
C1671 and
R1671
to
T14500
during 12-volt or 24-volt
operation
to
reduce converter
transients
(see
Figure 6-10).
Sections
C
and D of S1665 select
either transformer terminals
10A
and
12A
or 10
and
12,
to provide the
same secondary
output when operating on
12 or 24 volts. Sections B and
E
connect transformer
terminals 10 and 12
to
SI
665 sec-
tions
C
and
D and to the inverter
feedback circuit during
both 12-volt
and 24-volt operation.
MAINTENANCE
Obtaining
Replacement
Parts
STANDARD PARTS.
Most electrical and
mechanical
parts
con be obtained through
your local Tektronix field
office or representative
However, you should
be able to
obtain many
of
the
standard electronic components
from
a local commercial source in your area. Before
you
purchase or order a
part
from a source other than
Tektronix Inc
,
please check the Electrical Parts list forthe
proper value, rating, tolerance and description.
SPECIAL PARTS. I n addition
to
the standard electronic
components, some special components are used in
Option 07. These components are manufactured or
selected by Tektronix, Inc. to meet specific performance
requirements, or are
manufactured
for
Tektronix in
accor-
dance with our specifications. Most of the mechanical
parts used in
this
instrument have been manufactured by
Tektronix, Inc. Order
all special
parts directly from your
local Tektronix Field Office or representative.
ORDERING PARTS. When ordering replacement parts
from
Tektronix, Inc., include
the
following information:
1 . Instrument type.
2. Instrument
serial
number.
3. A description of the part (if electrical, include the
circuit number).
4.
Tektronix part number.
Table
6-2
OPTION 07 TEST EQUIPMENT
REQUIRED
Description
Minimum
Specification Usage Examples
DC Voltmeter
22 V to 28 V,
1% accuracy.
Set input
voltage
a.
Triplett Model
630-NA
b
Simpson Model
262
Test Oscilloscope"
Bandwidth, dc
to
500 kHz;
minimum deflection,
10 mV/division.
Verify inverter balance
a.
TEKTRONIX 212
oscilloscope.
b.
TEKTRONIX
465B
oscilloscope*.
DC
Power
Source
22 V to 28 V and
11.5 Vto 14
V.
Handle
starting
surge
of
4 to 10
A without
dropping below 22 V.
12-volt starting surge is
approximately 15 A.
Supply
operating
power
for Option 07.
Any variable DC
power supply that
meets minimum
specification.
“It the
instrument
under test and Option 07
are
operational
and the power source used has a
negative ground,
the
instrument
under test may
be used as the test oscilloscope.
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