Firestone Tire & Rubber Co. S7427-8 Schematic

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Product Information:
Model:S7427-8
Manufacturer:Firestone Tire & Rubber Co. (Air Chief)

Schematics Content:

Please note: this content is a computer-generated interpretation of the above schematic and is provided only to help assist you in locating this schematic. For the actual text, please consult the schematic above. Thank you.

Page 1:

PAGE 11-'1 FIRESTONE

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l. F. ALIGNMENT. With the gang condenser set at minimum, acl-
;'ust the test oscillator to 456 KC and connect the output to the grid
of the first detector tube (IZASGT) through a .05 or .l mid. con-
denser. The ground on the test oscillator should be connected to
the chassis ground. Align all three LP. trimmers to peak or maxi-
mum reading on the output meter. .

BROADCAST IAND ALIGNMENT. Removelchassis lrom cabl-
net and set it up on the bench. Care should be taken to have no
iron or other metal near the loop. Do not make this set-up on a
metal bench.

Connect the test voscillator to the antenna oi the set through a
200 mmfd. (.0002) condenser. With the gang condenser let at
minimum capacity, set the test oscillator at 1720 KC, and adjust
the oscillator (or 1720 KC trimmer) on gang condenser. Next-set
the test oscillator at 1400 KC, and tune in the signal on the gang
condenser. Adjust the antenna trimmer (or 1400 KC trimmer) for
maximum signal? Next set the test oscillator at 500 KC, and tune
in signal on condenser to check alignment oi coils`

ALIGNMENT PROCEDURE

MODEL S- 7 405i-4

l. F. ALIGNMENT. With the gang condenser set at minimum, ad-
just the fest oscillator to 456 KC and connect the output to the grid
of the first detector tube (IZABGT) through a .05 or .1 mid. con-
denser. The ground on the test oscillator should be connected to
the chassis ground. Align all three LF. trimmers to peak or maximum
reading on tho outnut meter.

BROADCAST BAND ALIGNMEN'I. Remove chassis, shield, and loop
antenna Irom cabinet and set them up on the bench so that they
occupy exactly the same respective positions on the bench as they
did in the cabinet. Care should be taken to have no iron or other
metal near the loop. Do not make this set up on a metal bench.

Connect the test oscillator to the antenna oi the set through a
200 mmtd. (.0002) condenser. With the gang condenser net at

minimum capacity, set the test claillator at 1720 KC, and adlult
the oscillator (or 1720 KC trimmer) on gcmq condenser. Next-set

the telt oscillator at 1400 KC, and tune in the signal on the gang
condenser. Adjust the antenna trimmer (oxl 1400 KC trimmer) tor
maximum signal. Next ee! the test oscillator at 600 KC, and tune

in signal on condenser to check alignment ot coils.

(C)John F. Rider, Publisher

Page 2:

FIRESTONE PAGE 11-1

.IRE & RUBBER CO (Serials Prefide with C)

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