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|  Normal indications
measurement
Isolating procedure
Point of
125V B+ short-circuit test (fig. 23)
22K ohms . . . . . .
If resistance is less than 22K ohms, proceed
Terminal P of P1 (fig. 48). . . . . . . . . .
with 125V B+ short-circuit tests.
22K ohms . . . . . .
If resistance is now 22K ohms, remove rf
Terminal P of P1 with P101 disconnected
and power amplifier subunit (para 107) and
check plate circuit components of V101,
V102, and V103 (68 through 75).
22K ohms . . . . . .
If resistance is now 22K ohms, remove uhf
Terminal P of P1 with P101, and P201
injection subunit (para 108) and check plate
disconnected (fig. 83, left side view).
circuit components of V201 through V205
25K ohms . . . . . .
If resistance is now 25K ohms, remove
Terminal P of P1 with P101, P201, and
500-kc if. amplifier (subunit (para 111))
P501 disconnected (fig. 83, bottom view).
and check plate and screen circuits of
V501 through V504 (fig. 59, 60, and 61).
25K ohms. . . . . .
If resistance is now 25K ohms, the fault
Terminal P of P1 with P101, P201, P501,
is in the plate or screen circuit of V303
and P304 disconnected (fig. 83, right
in the first if. amplifier subunit (fig.
side view).
30K ohms . . . . . .
If resistance is now 30K ohms, remove
Terminal P of P1 with P101, P201, P501,
3.0- to 3.9 if. subunit (para 110) and
P304, and P401 disconnected (fig. 83,
check plate circuit components of V401
right side view).
Terminal P of P1 with P101, P201, P501,
50K ohms . . . . . .
If resistance is now 50K ohms, remove
P304, P401, and P801 disconnected (fig.
audio amplifier and modulator subunit
components of V803, V805, V806, V807,
and V808 (fig. 76, 77, and 78).
500K ohms. . . . .
Terminal P of P1 with P101, P201, P501,
If resistance is now 500K ohms, remove
P304, P401, P801, and P301 disconnected
first if. amplifier subunit (para 109) and
check plate and screen circuit components
of V301, V302, V304, and plate circuit
components of V305.
If removal of first if. amplifier subunit does
not cause an increase to 500K ohms,
remove relay subunit (para 113) and check
associated circuit component.
If resistance still does not increase to 500K
ohms, remove front panel (para 117),
check F702 fuseholder (fig. 49), and main
frame wiring (fig. 127).
Bias short-circuit test (fig. 23)
Terminal Z of P1 . . . . . . . . . . . . . . .
239 ohms. . . . . . . .
If resistance is lower than 239 ohms,
proceed with bias short-circuit tests.
Terminal Z of P1 with P101 disconnected . .
239 ohms. . . . . .
If resistance is now 239 ohms, remove rf
and power amplifier subunit (para 107)
and check R109, R108, C146, and L114
Terminal Z of P1 with P101, and P801
239 ohms . . . . . .
If resistance is now 239 ohms, remove
disconnected,
audio amplifier and modulator subunit
circuit wiring of V805 through V808 (fig.
Terminal Z of P1 with P101, and P801
22K ohms . . . . . .
If resistance is now 22K ohms, check
disconnected and relay subunit removed
C610, C611, C612, and associated bias
circuit components in relay subunit
Terminal Z of P1 with P101, P801, and
22K ohms . . . . . .
If resistance is now 22K ohms, remove
P501 disconnected and relay subunit
500-kc amplifier and check R531 and
removed.
associated circuit component (fig. 59,
60, and 61).
77
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