Motorola 107F31B Schematic

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Product Information:
Model:107F31B
Manufacturer:Motorola (Galvin)
Description:HS-87

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 19-108 MOTOROLA
MODELS 107F3i, ` MoToRoLA`Tirc.
lO7F31B, CHASSIS
MODEL 1O'7F31
TUNING RANCE - BC
V* III
ANTENNA
f snows
I LEADS ~>>
WHEN AN EXTERNAL
THE F-I
rn: curs mmxzo s'i?:ZJ?
mr. LEAVE me LEADS nom I
IN PLACE IF N0 EXTERNAL F-M
H f * IMPORTANT
ANTENNA I5 nzoumsn.
FIGURE 1. FM LooP ANTENNA
POWER SUPPLY - 117 Volts, 60 cycles, 150 watts (with record changer)
Opp- *-:I 'CI-'OW' '-'CLICK' 6 PUSH BUTTONS , _
I '~CP~? _ mono Puono on 5 'Z I 1-uN.NG
X2b'I"??5?$,1'TT?'L?L EBQIIISIN '>>3f'I3I'>>I'= WAVEBAND I
TONE CONTROL
URN RADIO (li BY
TURNING TO THE RIGHT
INCREASE VOLUME BY
TURNING KNOB TO THE
TO TURN RADIO OFF
TURN KNOB T0 THE
LEFT TILL CLICK IS
(C)John F. Rider
WITH PHONO
RADIO SWITCH
TURN TONE CONTROL
KNOB T0 LEFT
TILL CLICK IS HEARD
TO PLAY RADIO
TURN TONE CONTROL
KNOB TO THE RIGHT
I5 HEARD T0 PLAY
RECORDS
TONE CONTROL MAY BE
VARIED BETWEEN THE
CLICKS T0 SUIT
INDIVIDUAL TASTE
RADIO OR RECORD
I POSITION - SHORTINAVE IFOR MANUAL TUNING
49,3I O Z5 METERS OF STANDARD
(5500 T012,2OO KC.) BROADCAST, EM. AND
BROADCAST
ICLOCKVISEI TILL CLICK
PLAYING POSITION

Page 2:

MOTOROLA PAGE 19-109
MOTOROLA INC. TEODELS lO7F3l,
1O'YF3lB , CHASSIS
" msmucrnous ron serrmo Auromrnc TUNER PUSH aunons
l. Turn the radlo ON and allow lt to warm up for a
period of at least flfteen minutes.
2. While waltlng for the radio to warm up, loosen
the tuner locking screw (A) all the way. The lock-
ing screw ls accessible from the rear of the cabl-
net. (See Figure 12.)
8. Make a llst of the frequencies of the local sta-
tions you wish to tune in automatically. It ls re-
comended that you select the most powerful stations
\4. Turn the band switch to FM or BC position, de-
pending on the statlon be 1ng sct up, and Carefully
tune in the flrst station.
NOTE: The buttons may be used on elther BC, FM `
or any comblnatlon of AM and FM. BE SURE TO SET THE
BAND SWITCH ON THE PROPER BAND!
5. Adjust a slgnal generator to zero beat wlth the
NOTE: Whlle lt ls advisable to use a slgnal
generator for accuracy, lt ls not an absolute ne-
cessity. The station signal may be used.
6. TUBE to the dEURS1I'9d ST.8T.1OIl OF D0 E116 5121181
gEIlEURI'8.LOI`, with CUE fllillllg KXIOTJ.
7. Holding the tuning knob, push the selected but-
ton and HOLD IN UNTIL THE MOTOR STOPS.
8. Repeat Steps 6 and 7 for each of the buttons.
9. Carefully tighten the tuner locklng screw (A).
10. Check the setting of the button by tuning ln
the station manually, then push the button set for
that station; no effect on volume or tone should be
noticed. If not correctly set, readjust--following
Steps 4 through 9.
FM SERV ICE NOTES
ln some cases, people are not tuning FM sets
properly. FM is more difficult to tune than AM,
although Motorola receivers are easier than most.
There are three peaks present; the center peak,
whlch is the correct one, is hard to locate. The
peaks on elther side of the center are slightly
distorted. If you get a distorted peak on only
one side of the center, the dlscrlmlnator ls pro-
bably out of alignment.
Some people expect too much of-FM. You cannot
expect great distance. The horizon, as vlewed from
the transmitting antenna, ls the normal service
area. Many PM stations are now operating on low
power, waiting for new equipment. Reception will
improve greatly when power is lncreased. Most of
the bad reports have come from the fringe areas. In
many cases, reception can be improved by using a
dlpole antenna, mounted as hlgh above the roof as
possible, and aimed directly at the station.
Locatlon of the radio is lmportant when lt ls
operated on lts built-ln loop antenna. Moving the
set even a few feet away from its present location
may increase or reduce signal strength by more than
50% because a stronger signal may exist at one lo-
cation than another. Therefore, ln homes where re-
ception ls poor, you may be able to improve lt by
plac ing the set aglnst another wall. The Motorola
figure B loop antenna is omnldlrectlonal.
Motorola FM sets use a relatively new clrcult
known as the Ratio Detector, instead of the usual
?1lm1ters. The following paragraph of explanation
is quoted from the R.C.A. License laboratory Bul-
'Since a clrcult of this type ls relatively immune
to amplitude modulation, lt ls unnecessary to pre-
cede it by a limiter stage. Also, since lts lm-
munlty is not a direct function of the signal
strength, there ls no threshold action of the type
encountered where llmlters are employed."
It has been thought, erroneously. that the use
of llmlters ln an FM receiver ls l@rat1ve for pro-
per reception. This ls not the case. ln this con-
nectlon, 1t is Important to understand that a llml-
ter requlres several volts at lts grid to become
effective. If the received signal strength is too
weak to prlvlde the required voltage at the limiter
gm, the LQLQQQ gg gg gpitlgg. 'rms means than
below a certaln threshold of signal level, the llmi-
ters do not work and, as a result, do not contribute
to amplitude' (noise) rejection. Furthermore, noise
voltages are not purely amplitude modulated, but
contain frequency modulated components agxlnst which
no amplitude rejection device will discriminate.
From the above comparison, you can see that
there ls little, lf any, difference between the two
clrcults, insofar as noise reception ls concerned.
In elther case, low signal levels from the PM sta-
tlons will result ln nolse reception, If there is
any noise ln the nelghborhood.
The lfH1n advantages of !'3C1O (IQLSCITDH. RS used
in Motorola FM are, first, very little ln-between,
station noise, and second, easier tuning because the
side peaks are slightly subdued (as compared to the
limiter type of receiver). :raking it easier to find
the center peak.
o John F. Rider

Page 3:

PAGE 19-110 MOTOROLA_ _ __
mms' lol F 1 MOTOROLA INC.
Maximum pertormnce can only be obtained if ex-
treme care ls exercised during alignment.
Use an insulated screwdriver wlnn adjusting the
FM tuner trimmers.
A speclal wrench for adjusting the slotted nuts
on the tuner cores will be required. You can eas 11y
fabricate one from a Motorola auto set Volume Con-
trol Shaft and Coubllng Assembly (Part Number
1B'7OB47, $.50 list) by simply spreading out the
forked ends and filing to fit. Solder the assembly
together to mke lt rigid.
An AH (30% amplitude modulated) sigzal genera-
tor covering the frequencies shown in Alignment
Chart I, is used to align the broadcast and short
A low range output meter, con-
wave and PM bands.
nected across the speaker voice coll, is used as an
The broadcast and short wave band alignment is
conventional; instructions are given in the follow-
The FM band alignment can be satisfactorily
performed by following the instructions ln the chart
when properly aligned, the dlscrlmlnator does not
respond to amplitude modulation and since an AH
type signal generator ls used for aligning the FM
circuits, it is necessary to detune the discrimi-
nator secondary and leave lt that way until all of
the PH circuits have been aligned. After completing
the alignment of the PM circuits, proceed to align
the dlscrlmlnator secondary by applying a 4.5 Mc
AM signal to the control grid of the 2nd PM conver-
ter tube and adjusting the discrimlnator secondary
core for minimum audio output. No adjustment of
the F11 circuits should be attempted with AM after
the dlscrlminator secondary has been properly
output indicator. 311311641-
? se nf no can
5 MANY
some vm (R) i _F rm
SEC SEC. SEC SEC. SEC 'E 7
8 RECEPTACLE
svsgr .2391 _ t _ I nccsfmctz ? 1 WEAR vm,
BC LOOP
POWER W1 ? CORE
mom vusw
FIGURE 7. ,TUBE &
TRIMMER LOCATIONS
Rider

Page 4:

MOTOROLA INC.
MOTOROLA PAGE 19 111
10 F3lB, CHASSIS
3? EUR ?? 3 2
: Sag 555 ig 5 ~"? iii 5:
(C)John F. Rider

Page 5:

PAGE 19-112 MOTOROLA
HODELS 107F3l , lO7F3lB , MOTOROLA INC.
CHASSIS HS-57
CHART II. ALIGFMENT PROCEDURE WHEN USING FM SIGNAL GENERATOR AND OSCILLOSCOPE
R?fB!' to F1g'l1I'EUR 7 fOl" IOCBLIOII of all BGJUSUIIEDY. f.I`lI||I7EI`S arid COTESQ
SEP OPERATION
gg Q g Channel Allgggent
1. Same as Step 1 ln Chart I (Use AM signal generator)
2. Same as Steps 2, 3 Z. BA 111 Chart I (Use AH signal generator)
3. Same as Steps 4 & 5 in Cmrt I (Use AM signal gnerator)
&,_? Mc Q Qhangl Alignment Using Eg Signal Generator & Oscilloscope
1. Connect the input terminals of the osclllcscope vertical amplifier to the high side of the re-
CGIVSI' VOIUIDE control and the Ch8SS1S~
Z. Connect the FH generator synchronizing voltage output terminals to a phase shifting network,
consisting of a variable 1/2 megohm resistor In series with a .002 mf capacitor. The input to
the oscilloscope horizontal amplifier ls connected across the .002 mf Capacitor. See Figure 8.
(This phase shifting network my not work with every oscilloscope.
may be requ fred.
Different values of~R & C
3. Apply an F11 4.5 Mc signal (125 Kc deylatlon) through a .Oi mf capacitor to the control grid
(pin #4) of the W7 tube ln the second IF amplifier stage.
4. Screw d1SCI`1mlI18.Y-OI' SECO1'ld6.I'y COTE (Q) out 35 f6`[' BS lt Will BO.
5. Adjust dlscrlmlnator primary (10) untll the pattern obtained on the scope is synmetrlcal about
the vertical axis. The phase shifting network resistor Is adjusted to give only one trace. _
The pattern obtained ls the resonance curve of the primary, whose xraxlmum respome should be at
exactly 4.5 Mc. (See Figure 9).
6. Adjust dlscrimlnator secondary (9) until a symmetrical pattern is obtained, with peels occurring
at about 100 Kc above and below 4.3 Mc and ls substantially linear between peaks. The trace
should pass through the intersection of the vertical and horizontal axis. The pmse shifting
network should be adjusted to give only a single pattern at all times. (See Figure 10).
(B) 4.5 Mc IF Amplifiers -
1. Apply an FM 4.3 Signal (100 Kc deviation)
lst IF amplifier Stage, through a .001 mf
(11 & 12) to get a symmetrical pattern as
2. Apply an in 4.5 s1i;na1 (100 Kc deviation)
just both primary and secondary cores (13
between peaks, is obtained.
E! Bins &1BBm?LlL
5. CIISCK the DOSIEIOII of Y/IIE FH DSCll16f,OI' EUIIIIIZ COI`EUR
to the control grid (pln 44) of the 6SG'7 tube ln the
capac ltor and adjust both primary and secondary cores
before, with peaks occurring at a slightly lower de-
to the control grid (pin ;1) of the 'IFB tube, and ad-
& 14) untll a symmetrical pattern substantially linear
(13). Set the spacing between the core and the bake-
11f.EUR D1EURCEUR to Whlflh lf. ls IYIOUHESG, to 1/32" by f.UI`I11l'l8 Elmlng COPE slotted BHC.
o John F. Rider

Page 6:

MOTOROLA PAGE 19-113
MODELS 107F3l,
5. Remove the FH loop and connect generator output d1rectly to the receiver R1 loop receptacle.
7. Set receiver d1al to 90 Mc and also PM signal generator to 90 Mc (22-1/2 Kc dev1at1on). Adjust PM
osc11lator, antenna and variable IF trimmers (15, 16 A. 17) for mxlmum 1nd1cat1on on output unter.
(Output meter should be connected across speaker vo1ce co1l.)
8. Set receiver d1al to 1% Mc and also PM s1gnal generator to 105 Mc (22-1/2 Kc dev1at1on). Adjust FH
oscillator, antenna and Variable IF cores (18, 19 3. 20) for naximum indication on output meter.
9. Repeat Steps 7 and 8 several t1mes until further adjustment does not increase the output. Malte the
final tr1g|m__gg ad_')ustment at 105 Mc. (1.e., trinmers 15, 16 4. 17 at Q5 Mc).
10. Connect FH loop antenna to receiver receptacle. Radiate an FH 105 Mc (22-1/2 Kc deviation) slgnal
1ntc> PM loop. Set receiver dial to 106 Mc and adjust trimmer (17) for maximum.
FM SIGNAL
GENERATOR
SYNC. VOLTAGE R~F
OUTPUT OUTPUT
2 PATTERN WITH DISCRIMINATOR
_ ORREGTLY ADJUSTED
T OSCILLOSGOPE :I PRIMARY (10) G
PHASE MEG ? FIGURE 9
T0 H H SID
SHIFTING OF IISCVR. E
CHASSIS
FIGURE 8. SIGNAL GENERATOR & (BCILLOSCOPE HOOK-UP
?Y NIIYER T0 END 0F /` ,
LIVE ON DIAL SKMLE.
: memo :
PATTERN wnrn o|soRm|NATon "'*'"""'
SECONDARY (9) CORREGTLY ADJUSTED. S 'll-llllth
FIGURE 10
l`lG\ll I). NIMH All IIN! UE IITAIL
(C)John F. Rider

Page 7:

PAGE 19-114 MOTOROLA
1O?F31B, CHASSIS
MOTOROLA INC. _
FIGURE 12. PARTS LOCATION - CABINET - MODELS 1071731 & 10'IF31B
(C)John F. Rider

Page 8:

MOTOROLA PAGE 19-115
MOTGROLA mc. Momma 1o7F31,
1o7F31B, CHASSIS
(C) John F. Rider

Page 9:

PAGE 19-116 MOTOROLA
MODELS lOYl*'3l,
lO7F3lB, CHASSIS
FIGURE 14. PARTS LOCATION - CHASSIS HS-87,
ELECTRICAL PAR
BOTTOM VIEW
(C) John F. Rider

Page 10:

MOTOROLA
NICAL PARTS
BOTTOM VIEW
PAH
FIG
(C) John F. Rider

Page 11:

PAGE 19-118 MOTOROLA
M CONVERTER
= THE POINT.
MEASUREMENTS MAY VARY DUE TO
VOLTAGE
(C)John F. Rider

Page 12:

MOTOROLA PAGE 19-119
MOTOROLA INC. MODELS 1071931 ,
ec-2 z1411m41 Sliver mee: 250 nr . ...... "'" ?"??1? 55? """ ~~
_c_,, zormuo .m_"_ Cerum .Ha mf 0-11 101114091 vnum Control: 1 neg: apnea at 000.000
C4 mme ,Wm _us I: 400 ., 0-10 000040 1 neg 105 .......... . .............
0-11 some nw: .os 01' 4oov P20 WVWS 1" 1% 1"
C_u seam hw., _ol I, wo., 0-as 016410 50.000 100 .... ..... _ ........... .
C45 some mm.: _os ,, may 0-as GR-6301 1000 ....... .............
Cds $9315 hp", _C5 -f may ___ ll-B4 IBAZUJGE Tone Control: 1 ug: lnnludes Phono-
C40 MM," mc.: sm -, sow 0-21 000220 000.000 . ......
C'~21 21M&B men: 1000 mr sow "'" ?'"??" "'>??? 'W 5" "-L ?~
8_2 ww* mm _om _r ww n-za enema 22.000 .......... ..
c-es mom Paper: .01 nr s00v .... ................ 0-05 000054 10.000
C'?7 mom super: .01 nr som ....... ..... . ........ 0 -04 sum 41.000
c-00 $0010 Paper: .m nr 5001 .... .. 0-51 ensam :soo Ill 111
| c-5 204152.54 11-1ner. uw 10-00 -r; nun ug Drucker. lnrclls
C47 00411141 hlnsr, nm: 10-00 -r . .............. 0-2 1x15020 msnnungan eumn: 0 nunonz nun mtl!!
C-53 zmvlzzg Trlgr, llcs: 2-12 nr; include |1ng` "||,,m.u>>'3 swlnch (cvlvlaw) ..... -. .... .........-
nnqnz; pre or mop snrenm . ....... 'r-1 04015401 1:1 xr. 4.0 rm: wnmeu nun lron cares
c-40 $0000 Piper: .1 01 zwv ....... 1'-2 240-1541.5 ana xr. 4.0 ne: complete nun mm mms
C-41 $9339 Pntrz .01 lf 400V .... ... am padding cmnnnlrura, nur leg; gmem
c~4-0 SUQG Flnsr: .112 nr 400V ...... cores 0:10 p0aa1ng'cnpqc1cars, nur xess
C-M S9824 Plnen .02 ll' AOUV ............... ..... shield ........................ .... ....
C-46 $0001 Paper: .01 nr 1001 ......... ...... . ..... 1* -4 24875487 Ir. 456 nn: cumnlete nun lron enree 0:0
BC-46 BOMBM frlir, lien: 10-H) lf: llth In Unch: pnadlng csnnclnors. bu: less shield ...
C47 234711 ceruxe: .se ur ...... ........... . ..... 1* -5 24011112 mme. 455 ne: complete nm lron cares
.c-40 moms P00011 .05 lf 4o0v .... .. ....... ,M ,m?`,;? samlm,-S_ but lm Smell,
0-50 25l'7'756 Elnectrolytlcz 10 nt 1007 1-1 25010400 Pour ........... . ........... ..... `
(3-61 214112241 Silver nm: 50 lr - ~~'-- 1*-0 24877710 nr armacssn: ennmeze nun xrnn cores nun
loss snxela . .... ........... ......,... _
PHO! LMI!! IISCEIJANEOUS CHASIS PARTS
1-1. 2 1 1X'7l?l smcrev.. enneen ng: Includes rubber
|8 ?|1l?| Bulk 8.31 .lil LDDIIIAI' BYOIIQE DISCS 8172!-S lf!! QYGIELS .......~.......~.
1.-1 84A7|US mn. rumen: ...... 4 80521859 Cora. 110| em mum 2 conductor. run-
1.-s PAAWABD smrweve oeexluwr . .... .. 5 15014025 Cover. tuner .... .... .... .......... _ .
1.-5 117526 rn loop munm: urn lam nly: me 11101 =es1e. runner ?n.me1
1.-0 24l47&)\4 00 mnp mmenm ....... strips em voxnzer ...... ..... .
1104 ----------~------------~-- ----~~~ 9 57A|1&5 urumn. runner (suner vover 01:1
10 3'/K151-25 aramec. mununs: runner (amen
lou: All nllnors Ars 1/ZH 20| imuuud clrnon type unless 0u1u~ smemmu 7| long _ ___________ __
|186 IDWXUIG- 12 1X7&5B usa Assembly: single conductor;
4-1 002100 10 ng ...... .. shielded e' lnng ............... . .... ..
A-2 M6015 16,000 1H )l.l. .. 15 H70369 use Assembly: single conductor; shltldedl
'G-G QQ; 1.5 _I .. ?....--.. 14 11470488 leld I Plu? Asselhly (nhnno pickup con-
I 0-0 man 2.000 15 xv 0. 1, 15 117750 ueae 1 man rmar necepuue mer
l-'I 06716 B0.&D .4 .... ..... 10 HT7732 lands L Sneaker Rzcencacle Assennly ....
0-0 50500 $0.000 lf# 10 17 3&24B15 wax. line corn: r1:>re .............
e Psrt nr 0-04-1* Tuner
(C)J0h1'l F. Rider

Page 13:

PAGE 19-120 MOTOROLA
MODELS 1071331 , MOTOROLA INC.
lO'YF31B, CHASSIS
19 as-rom nur.: 3/9452 x 1/z mx; 114-1111 puma 120 121-/sees C1 1p. pp\mr1r\g qpnono connector nm ..
20 287061 Nw S/9-2 1 9/1? PHIHW ?mlN' DU' 122 3511171712 cxotn. ga-111e: norm (1o'n=31B) .......
21 0112706 P1W=~ ?1??f\'?1?=1? ?lD??"?f` "IG 124 111175551 mmreon. o1ne1 rorrn pun wmm
ea zamms 1>1\:a)11->>\111r.?1= 1 pm (pn Phono mmp 125 1311-/o4a1 sscuncmon. push ourronz Drmm p111r1?;
B4 1x-/asus Pulley usuuxyz wp 1-s/w puma; on 501.1 stripes (107518)
rms uuanmg 127 13878158 or111e, rahlnvtl nrusnea brass rxnxsn ..
as l9A59d) runny. core: 1/4 groove 12a 55K4'715% Hlnge, door 1un1vers11>= onrmry bronze
Ze 49121741 Pnllay, cord: 3/B yoovn ............... ilnlih (comnnrtment door - 1L7IF31) ....
27 49121552 Pulley, cord: 1/2 groove ............... $29 55K47\692 Hinge, :nor (Universal): brass (compart-
25 9150550 Mesvncle: 5 wrong (phono motor recent) nent Jvor - 10'7F31B) ..................
2. ann, ,,?,m,,,,_ , ,mu (M mo, "L_ Nnprp 130 ssurveus nmgo. radio aroryrxgm nom; stprmry
so umm 1meor1=1?= s bronx (annular recnnrb bronze rinxsn 110'/mx)
31 5171241 mvrr. snoaxau-1 .1e-1 =r1<>u1a?r (com :sz 55K'7515O uxnoe. radio door: left mm; smmrv
pulley mtg) ......................... bronze r1nxsh(1D'IP.51)
sz sx-11510 Rlvnt. shoumcr: .512 shoulder (com 1:12 55111145 Hlnm. raam door: rmgnr nam; or-151
puny ma uovrum
as uc-mm seue. am: gms 13:1 sax-/11411 nmge, 1-mo upon mv. mm; or-151
sa ssvsoe scrum: is x 1/4 PIE 911111 ne: nun amen (107F31B]
mul screw; canllm Dllted (BC nec. 154 14175142 Insulator. F14 loop mounting ......
can nr; nm sw ou. 1111 -rg) 155 14A7S554 Insulator. um; more
|1111 111-ew: 11411111 onus (ssneru 137 .,36K70511 moo, comm: p11Sr1?; pm"
-m1nr.11-11; me ZMK70513 mon. rpnnron p1asr1?; urn rea op;
so ssnoo aurora: e-<12 x 5/xe suomm; ue-111| 1:o 4sv?av Lo?\v:1=n?r= 1a exterml: r?o|1um plated
sv S7461 som: as x :s/4 rxz ammo mx 1111.1 110 2572610 mr. ree: e-<12 rnrem (pmsszs my
so 1171069 sumo 1 Iron can suave unmly (rar 142 zsvozz mr: 1/4-zo 1 v/11 ner; ?1ar11\m pmeo
C1 111-rr/47 scent. 4111 11111: 144 ssnmvme ha, rem 11 1/2 r 1/5
48 i|A'71661 sonar. ww 1111111111 -1 prone 1-s/1e us 35K78174 na, Ullle rcompprmnr mor; .
lountlnl centers 145 Ssnvexn Pia. grille (speaker panel)
45 enema smut. won: wma, xpem 117 64C4'IU)78 ram, rem-a clnnger p.,1r<,..\ pm,
'~=44 e11'r1o15 smut. tubs: nur; 1o<:n1 11a zaxxsefu Plug 4 p1n (sc mop ?or1r1e?r?r>
I6 9110115 spun. rum wmua. pcm; 511151481 tyoe um" nr; screw ` H
lat bmp. '
49 $721114 Serin? omni;-11 hmner; 1- nm; (dizl X52 3513" sm" 'Z ' 5/5 """U?? ml MUG H006
50 8327078 Strip. slltt bearing MDN ............ 153 _ ':?-~~-~---~~~----~--4>>~
51 S1A15?55 srr1p. m-|111-1. 1 urn 11111111141 nm, sam' S333 _ ':!_;;/?;';Z;"?Lf;?; N20 'vw
Dine ntl) ..........
52 suusoee smp. m-|11-111: lmulakd lug gz -r; W wml _
s'z 91114909 Ham. 1n1n1nt1w rum (lnsuutu ws sms" Sc 1 >
?1>>rv,ro1yr1? p1p1?1ror rr-an -rg r1v1r.1> "?"'/5 1 5/4 =1?"?51 fl" head wood
60 5011506 uuxur. cuwrlsalonz sponp rubber ..... girel. sutuary oronn finish (11610 door
CABINET PARTS ~ IIDELS l0'I\'-'31 5 10'IF31B 157 532365 km? "U ;~;:-;;;;;a-;--su-----...
screw: mnxum mum <?m;>>111 up
1m 1911471151 mock. xanax nmmtln: nom loo zsvoso Sxaeodnut: for :s/11 ?111mr1r'r;?'2;1;""
101 v1-/rns hmm. 111- emu nm cmci rm ror.11n>>r1
15 'rrnmo sr-nent. loco manor: lex 41A'11'n? sprinz. enusu 111111 ?
106 'ru-ans armmr. phone rm: 112 MA72780 sprum. rpm rrrxwr) _
107 1111154 mont. pun: um 15 1114v1141 sprmz. ammo rm.: 1?ur1nz
mos &BM71759 mumng; :meer (phono 111111 annum.; |114 41m51s Snrxng, ropporr-upper (recom emrrgrrm
100 'IA471756 lfwht, svriu anchor ..... .... X66 GIKVEUXG Svrlnz. support-lonr (rocom cllnpr
110 7A'717& Bricht, tilt nunl spring ............ cushion) .......,,.,_,___________
111 451471745 super, runner me eau'/me stop, uvu-= umm; 5/p mu
112 u1'noo1 sumo 1 spruu u1m1y= nxnur push- :ev ssmsoe an-111, bllllftt 1p?1m-1 om up. mi"
button 111:11 uanrr sm-in: (1o'/nn ..._ tea snnvlss strxp, ron.: 0-3/u I \ I 1/G N
118 uvesa c1r,?n unnnu (mul umm we 4sveeo when 1/1 1 5/1, 1 M, mm ?','_,',??;
11a azneno cmv, cum (na moo mg. un 1 14111 wa can umrr 1 x 5/14 1 css :oxen w1n1\:'
(C)John F. Rider

Page 14:

pu Loop Nv Yin Us
,mf < sr unc ?r AMP zuomsuc ns wx
. A scum : :w I Nl T E .1 3 Y "
I/ use as wr ' | | ?~,
I1 1 1 3 Pcsmou swam
. Ill REOIPY, _ I
' ? "??' mn wean ? 1 . 1
LYZ 1 nun f___
" ' 1 5.3? I C-32 can
sw osc can 54 J-29 T
1 ' IMF
1 cm; can con; uc oss ? 7 'X'
|` FIGURE 20 . SCHEMATIC
(C)John F. Rider

Page 15:

JMOTOEOLA PAGE Q 121 122
" MOTOROLA INC,
MODELS lO'ZF31, 107B 3113,
CHASSIS HS-37
1-3 ' 025 Y new smu-una
:_ vow; moo uw * g 0* HF GVSGT
__ moo woo G pw, Ompuf
-: an CONT
_ _ -_=..~'_->>~->>>>-' ,, 150 ? 25V your gem
. - nun ~. sm114n>>o
, oonvsmsn , | . user
5,3 = _X, C45 Q I aww T0 ALL
E30 , , vs; Areas 0
SCHEMATIC DIAGRAM -CHASSIS HS-87

Page 16:

MOTOROLA PAGE 19-127
MODELS 107F31, MOTOROLA INC. MODEL E..3b__T
1O"[F3]_B , CHASSIS
I FIGURE 17. MODEL E-34-T AM~FM TUNER
THEORY OF THE FH TUNER
Referring to the functional schematic diagram
in Figure 18, the trlode T1 serves both as an osc-
illator and first converter, and tr1odeT2 serves
as the second converter. Oscillator voltage in-
Jection for the second converter is obtained through
.the coupling capacitor from the plate of Tl. T1
and T2 are sections of the 'IFB twin-triode tube.
The frequency relationships are glven in Fig-
ure 1B. The oscillator FO beats with the incoming
signal FS to produce the first Intermediate fre-
quency Fl, which is variable. F1 then beats with
the same oscillator frequency F0 in the second con-
verter to produce the second intermediate frequency
P which is 4.3 mc. with a 100 mc signal the osc-
1?lator frequency is 47.85 mc and the variable in-
medlate frequency is 52.15 mc.
This system of reception permits the oscilla-
tor to be resonated with a high capacitance, 250
mlcromicrofarads in this case. Consequently,
changes in the tube characteristics during warm-up
do not produce objectionable changes ln oscillator
frequency. This contributes materially to the sta-
b111I>>Y of the system.
The actual FM tuner schematic is shown in
Figure 20.
mr... ___ __ I EUR
3" mom szmne : swm"
FIGURE 18. FUNCTIONAL SCHEMATIC DIAGRAM OF FM TUNER
(C)John F. Rider

Page 17:

PAGE 19-128 MOTOROLA
Model E-314.-T MOTOROLA INC. -MODELS 107331,
(C)John F. Rider

Page 18:

MOTOROLA PAGE 19 I f
10'/F31B , CHASSIS
PART N0
PARTS L IST
WDEL E 3U-T AM-FM TUNER
DESCRIPTION
Spec 181 1 3 mmf
Silver mica 260 mmf
Variable ceramic '7-45 .....
Variable Ceramic 5 25 mm
Ceramic 18 mmf
Variable ceramic 7 45 llllfl
Mica 500 mmf 500V
Variable 5 gng
Silver mica 250 mf
l 5 mg 1/ZW Ins
RDS. C16 threaded >>>>>>
Lockwasher fe internal
Nut e-ez x 1/4 hex
Mamet Assembly 8 electromgnets
mount/ed gn channel. with terminal striv
Strip, terminal 8 insulated lugs ll
and 10 mrg
Rzver. 122 x 5/sa steel
mgnet Assembly single electrcmgnet
Bumper, arnature rubber ...
washer 7/161 l6'7x G5 thick
Nut: 10-52 X 5/8 DEX .. ....... .. .-N..
Grommet: for 7/16' hole ................
Lockscrew: S-52 x 1/4 SIOCCEG hex head .
Washer, 'C' spring .....................
Rod, stop: grooved . ....... ....
Motor, tuner . ......... ...... .......
Nut: hex; .594 long' 6-IN! thread (motor
Screws: S-32 x 7/B slotted hex head
mchlne screw ....... .... .... . ._ ..
Lockwesher: I8 internal ........... . ..
Lpckscr w: 6-32 I 1/4 slotted hex head .
Washer clutch) ...... .......... .....
vasner, spring (clutch) .. . ....... .. ..
Gear A Hub Assembly' 1-5/B P.D. ..... ._
Spring, cushion .......... . ........... .-
Screw: Br-52 x 1/4 slotted hex head
mchlne screw ........ . ....
Bushing, Clutch r'ete.1n1nEUR ......~.......
Bushlng, spacer
Washer
Yoke, retainer .........................
Yoke. cam
Eyelet 155 x .268 ........ ........
Screw, yoke lock
Pin drive Shaft .
Grommet. tuner mounting
Eyelet. mounting ..
Rack, drlve gear ale cast .
Plate, core mounting: bakellte ..-
Screw 6 52 X 1/2 slotted Hat head
mchlne s crew
Lockwasher #6 split
Nut 5 R X 1/4 Del ...~.??>> .nn ...N
NUT., Swivel
Clip, swivel nut
Plaia, fI'0nL m0Unt1ng: Bakelite . nu
Screw 8 52 X 5/8 Slotted l'0\|nd head
mchlne screw
Rod guide .......~. ...N ~.........
Split Gear L Bushing Assembly (large)
Bpllt Gear A B\l5h1l'15 Assembly (ennll)
Screw 6 R x 3/10 slotted binder head
machine screw
Lockwasher is external . ........
Spring. core tension
Core, Iron (ant. avar. IF) ..
Core, Iron (with paint dot) (csc)
Rear mounting Plate L Lug Assembly:
bakellte plate with soldering lug .....
Lug, soldering ................. ........
IHGUCLOF. VHF (Ant.): 2-l/2' long ......
Inductor, VHF (IF): 2-5/4' long ........
Inductor. VHF (Osc): 2-5/6* long .......
Bracket, trilmner mounting ..............
Lockwasher: #4 split ......... ........ . .
Screw: 4-40 x 5/16 slotted round head
machine screw .............. ......... . _
Bracket, trlmner mounting ............. .
Screw: 44 x 5/16 PKZ slotted round head
sheet metal screw ...................._
Washer, trimmer: fibre .................
Screw: 5-48 X 5/B slotted f1111$?EUR1' head
machine screw ........................ .
Screw: 5-4B x 5/le slotted tilllster head
macnlne screw .........................
Str1D. terminal: 1 insulated lug' [1
Receptacle, rerrule: 1 prong ...........
Cover, tuner (rear) ....................
Screw: Q4 x 3/16 PKZ slotted hex head
sheet metal screw .....................
Plnlon: gang drive .....................
MODELS 10'/F31, MOTOROLA INC. MODEL E..3L'_-
47 4174956 washer, spring
(C)John F. Rider

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