Tektronix 3B2 TIME-BASE Instruction Manual page 16

Maintenance — Type 3B2
Another way to remove a strip from from the chassis is to
use diagonal cutters to cut off one side of each yoke hold-
ing the strip. This frees the strip, and the remainder of
the yokes can then be pulled free of the chassis with a pair
of pliers. Ceramic strips are supplied with yokes attached
Fig. 5-1, Ceramic strip assembly.
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Test Points
The test points shown on the schematics simplify reference
to particular locations in the circuitry. Each test point is
indicated by a number at its location in the circuit. Physical
location of the test points are shown in Fig. 5-2.
TROUBLESHOOTING
If trouble develops in the Type 3B2, first check for proper
control settings. A control set to the wrong position may
produce an apparent trouble symptom, Improper calibration
can also cause faulty operation. By attempting to calibrate
the instrument, trouble may be isolated to a given circuit;
if the trouble is due to improper calibration, the trouble
will be corrected.
Unusual troubles can be caused by a failure in one of
the oscilloscope power supplies. This should be considered
any time the instrument fails to operate properly. The
oscilloscope manual contains information for checking power
supply voltages,
If you suspect that a tube or transistor in the instrument is
defective, replace it with good tube or transistor of the
same type. Then check to see if the trouble symptom is
eliminated. If not, the original tube or transistor is prob-
ably good, and should be returned to its original socket.
(14) (159116) (17) (18) (19)
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Pin 2 261
Fig. 5-2. Type 3B2 test point locations.