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Sect. IV Page 7
any other tests.
If
trouble persists, voltage and
resistance measurements should be made. Typical
d-c voltages and resistances to ground from tube
socket pins are given in Figure 4-8. Variations
from these values do not necessarily indicate trouble,
as the values will vary somewhat between instru-
ments, with variations in line voltages, and with
component tolerances. Generally a variation of
±
10% is to be expected and even higher variations
may be within the normal range. As a guide to the
order of variation that may be considered normal,
consult the Table of Replaceable Parts at the back
of the instruction book; the Table includes tolerances
for most resistors and capacitors.
DC VOLTAGE OUTPUT
TERMINALS
REGULATOR - - - - - -,
I
r - -
--MAIN
I
L
..J
I
SCREEN VOLTAGE
I
SUPPLY
r+-
I
I
I
Tl/150V, SRI
REGULATOR
CI, RI
I
I
I
I
I
VI. V2. V4B.
I
HIGH
VOLTAGE
RII-13. R31-33
I
SUPPLY
-+-
I
I
F50V
SR2, SR3
I
Tl 205V
C2, C3, KI
I
265V
•
L______
-
- -
- -
--~
r - -
SECONDARY REGULATOR -
---...,
I
I
REGULATOR
I
I
SECONDARY VOLTAGE
&
I
I
SUPPLY
REFERENCE
I
I
TI/ 285V,
SR4
-+-
VOLTAGE SUPPLY
I
RI7, C 6
V3, V4A, V5
I
I
R 24, R25
I
115/230V
50-1000 'V
INPUT
)
Figure 4-1.
Model 71lA Sectionalization Diagram
)
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