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TM 11-6660-204-25
and in the frequency time recorder.
3-22. System Sectionalization of Trouble
d. The pen lifter circuit consists of V407, K401,
System sectionalization consists of determining
and L501.
whether the trouble is in the power supply, the first
e. The operational test procedures should be used
or second half of the signal data converter, the servo
to assure that the set will operate in conformance to
system, or the pen lifter circuit.
s t a n d a r d s . The troubleshooting flowchart (fig.
a. The first half of the signal data converter con-
3-13.1) may be used to sectionalize a trouble.
sists of stages V301 through V304.
f. After determining the section containing a mal-
b. The second half of the signal data converter
functioning component, use conventional trouble.
consists of stages V305 through V307.
shooting procedures to isolate the trouble within
c. The servo system consists of stages V301, the
that section. To assist in isolation, simplified sche-
measuring circuit, tube stages V308 through V310,
matic diagrams of each section are provided in figure
and tube stages V405 and V406. Some of the servo
FO-31 through FO-35 at the end of the manual.
system components are located in the signal data
converter, on the control panel, the power supply,
3-23. Operational Test Procedures
Change 3


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