Fada Radio & Electric Co., Inc. FM 16 Schematic

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Product Information:
Model:FM 16
Manufacturer:Fada Radio & Electric Co., Inc. (FADA)

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:

(C)John F. Rider

Page 2:

` RECORD mans: GTModel'lol, A. R. c. as R. 257
Milwaukee Model 10700, RCD. CH. 15-1

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MODEL F 6 FADA RADIO AND ELFA

Ava Rinsrllr

BAND-SWITCH SHOWN

F' M BAND

(C)John F. Rider

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FKDA RADIO AND EL

ANY "991mm

I / _ bow

oJohn F. Rider

Page 6:

BAND-SWITCH SHOWN
AT 2"*D POSITION CLOCKWISE

SHORT WAVE BAND

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FADA RADIO AND ELECTRIC CO., INC. IIOErJL FMlG

AT 3no POSITION CLOCKWISE
BROADCAST BAND

\\ ,I POSITION `

(C)Jchn F. Rider

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MODEL FMlS

FADA RA IO AND E-LECTRIC CO.` INC.

BAND-swchH SHOWN 'iw "Om "Ad
AT 4*" PosmoN CLOCKWISE 20132
BROADCAST BAND(AuToMAT|c)
ONE BUTTON DEPRESSED q B+ ?

Rider

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' FADFA Riino AND ELEC'i'RTTTJ-_TT

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m me aFEA RADIO-AND ELECTRIC co., INC.

ALIGMNT PROCEDURE FOR Ain.

No attempt should be made m realign the various circuits until all
other causes have .been checked, unless the condition is so obvious

as to indicate that realignment is necessary. Then proceed as follows:
Volume Control full on.

Low range A.C. meter connected across voice coil to indicate output.
Keep signal generator attenuated so as to maintain ? scale reading on
output meter.

Make certain that dial pointer covers entire dial scale and is balanced
on both ends of the dial.

RECEIVER DIAL SIGNAL DUL'MY CONECT SIGNAL REFER T0 CHASSIS
AT GENERATOR ANTENNA GENERATOR TO: LAYOUT FOR LOCATION
iAJA. Exactly .1 mfd Control grid of Adjust for maximum
LF. 456 KC GSA7 tube output all AJA. IF.

r Trimmers (see tube
' layout sheet)

vFull Exactly .l mfd Control grid of' Adjust for maximum
Open l620 KC 6SA'7 tube output BROADCAST
Oso. Trimmer
Approx. Approx. - Lay Generator Adjust for maximum
1500 Kc 1500 Kc lead near Loop output (RJ. Trim-
Antenna mars)
Approx. Approx. - Lay Generator Adjust padder con-
" 600 KC 600 KC lead near Loop 'denser for maximum
Antenna output while rocking
Variable Condenser
Exactly Exactly 400 ohms Terminal strip Adjust Oscillator
16 MC 16 MC on rear of' Trimmer
l chassis #5
screw with short-
ing bar in place
Approx. Approx. 400 ohms Terminal strip Adjust R.F. and
15 MC 15 MC cn rear of Antenna trimmers

chassis #5 screw for maximum output

with shorting while rocking Var-

bar in place iable Condenser.
Check Image frequency
(Image should be below
the nmdanental fre- '

For trimmer locations see page 17-9

*V @0707th F. Rider

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FADA RADIO AND ELECTRIC CO., INC' ` MODEL FWS

ALIGNMWT PROCEDURE (F.1v1. SECTION)
(Using Standard AM Signal Generator and Vacuum
Tube Volt Meter method)

(Dummy Antenna- 4,00 ohms and .1 mfd paper condenser)

Aligm AM section first..

Set band switch to F.M. position and set Receiver dial to highest fre-
quency (Variable condenser Mly open).

F.M. Discriminatcr and LF. ali nt:

Feed into last LF. grid (lest G7 Tube) exactly 4.2 IB (unmodulated).
Align last LF. for mxinmm signal. (Use V.T. meter as a visual output
meter, by connecting V.T. meter across 1st 68.1'7 grid load resistor).

Aligning Discriminath coil:
With signal generator on last 6307 grid, detune secondary section of
Discriminator coil completely. Align primary section oi' Discriminator
coil for maximum output. (Use V.T. meter as a visual indicator - meter
set to lowest range and connected across 6146 tube diode load resistors
and ground). <

Increase signal generator output until Magic Eye tube shows maximum
opening. Do not change output of generator during entire Discriminator

With V.T. meter in some position as above align secondary section of
Discriminator coil for zero output. This point can be located easily,
as a slight rotation of the trimmer will change the polarity of the
voltage being measured at the diode load resistors.

After secondary section is aligned to zero output gereaseand then gg"
cregge the signal generator frequency in steps of 25 KC and note vol-
tage reading and polarity. The voltage output at 4.225 MJ and 4.175 MJ
should be exactly the same only different in polarity. Repeat the above
procedure with the signal set to 50 KG above and then 50 KC below 4.2 MC.
Repeat again with sigzal generator set to '75 KG, 100 KC, and 125 KC above
and ben., the LF. frequency (1..2 mc).

Rstouch Primary if necessary in order to balance voltages on either side
of resonance (1..2 MC). Reset secondary for zero if necessary and repeat
procedures #6 and #7 until output is balanced. (A graph of voltage

vs frequency will show a straight line characteristic .from fr 125 KC to

Set signal generator to exactly 4.2 m. Feed signal into converter tube
to control grid (6AB7 - 1853). Connect V.T. meter across grid load rs-
sistor of first limiter tube (1st 63.1'7) using V.T. meter as an output
indicator, feed in enough signal so that V.T. meter will show less than
hal! scale deflection on lowest range and align all LF. trimmers for

Set Receiver to exactly 49 MC.

Connect signal generator to #3 terminal of Antenna strip with snorting
bar in place. Adjust oscillator trimmer on F.M. section of Variable
condenser for maximum output (uing V.T. meter as a visual indicator).

Set R.F. and antenna trimmers (also located on Variable condenser) for I
maximum output. I

Connect antenna to antenna mounting strip. (on rear of chassis).
Check calibration of Receiver against a known station. If stationfre-

guency does not correspond with dial setting then the Receiver oscillator T
section is not correctly calibrated and procedure #10 should be re-

p ? For transformer locations see page _I

(C).Tohn F. Rider

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