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 V102 weak . . . . . . . . . . . .
Screen voltage is low (measured at
Replace V102.
test socket).
Open secondary No. 3 or 4 of
Check T101; replace if necessary.
T101.
Screen voltage is high (measured
R129 open at (+) end or R130
Replace defective resistor.
at test socket).
open.
Open secondary No. 6 of T101 . .
Check T101; replace if necessary.
Bias voltage is zero (measured at
R104, R129, R130, or R133 (TV-
Replace defective resistor.
test socket).
7A/U, serial numbers 1-1200)
open.
V102 defective . . . . . . . . .
Replace V102.
Open secondary No. 5 of T101 . . . .
Check T101; replace if necessary.
Defective selector switch contact.
Rotate each selector switch knob
and reset to test position.
Check continuity through the
appropriate section of each
switch (fig. 42-44 )..
Adjust defective contact; replace
switch if necessary.
Bias voltage is low (measured at
V102 weak . . . . . . . . . . . . .
Replace V102.
test socket).
Check T101; replace if necessary.
Open secondary No. 3 or 4 of
T101.
d. Adjustment Chart.
Line adjust circuit
CR101, R124,
CR101 or R124
CR101 or R124
CR101, R124,
CR101 or R124
or R134
or R134
Plate (para 23) and
R129 or R130
R129 or R130
R129 or R130
R129 or R130
R129, R130,
screen grid (pare 24)
or R133
voltage
Simulated tube test
R113 or R115
R113 or R115
R113 or R115
R113 or R115
R113 or R115
Shunt control
R127
R127
R127
R127
R127
RANGES C of FUNC-
R114
R114
R114
R114
R114
TION SWITCH
Bias voltage (para 22)
R139
25
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