United American Bosch Corp. 139 Schematic

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Product Information:
Model:139
Manufacturer:United American Bosch Corp.

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Page 1:

PAGE 5-14 Boson ' `
Installation Data UNITED AMERICAN BOSCH CORP
RECEIVER '"3l'A"fEUR"?
4 1 uaxgnn SPEAKER
SPEAKER
ANTENNA
MOUNTING TEE RECEIVER
A mounting plate is provided for the receiver which fastens to the steering column llth
two large straps This plate should be placed on the upper side of the steering column
below the instrument panel with the large ends of the keyhole slots at the top
nuts on the small carriage bolts fastening the straps to the mounting plate should be
securely tightened so that the mounting plate will not slip on the steering column The
two screws in the bushings in the receiver housing should than be loosened and the re
ceiver placed on top of the mounting plate with the heads of the screws entering the
keyhole slots in the mounting plate The screws should be allowed to engage the narrow
portions of the keyhole slots and the screws should then be tightened securely so that
the receiver is held rigidly in place (See Figure #1).
For cases where mounting on the steering column is not feasible, a bulkhead mounting
plate has been provided which is fastened to the bulkhead with three carriage bolts
The adapter plate which is provided for use in conjunction with the mounting plate
should be attached with screws to the opposite side of the receiver housing from that
through which the volume control shaft projects It should be placed so that the small
ends of the keyhole slots are at the top The receiver should then be placed on the
mounting plate so that the screws in the bushings on the mounting plate enter the key
hole slots in the adapter plate. when the screws engage the small portions of the key
hole slots they should be tightened so that the receiver unit will be held securely
MOUNTIIYG THE MAGMOTOR
The magxnotor or the "B" power supply unit is provided with a mounting plate which is
fasten d to the operator's side of the bulkhead with three carriage bolts. The two
screws in the bushings in the mounting plate should be loosened and the power supply
xmit placed so that these screws enter the keyhole slots in the bracket fastened to the
back of the housing When the screws engage the small portions of the keyhole slots,
they should be tightened so that the unit will be held securely in place
IKOUNTING T'iE SPEAKER
Two studs are provided on the speaker unit which fasten it to the bulkhead in a position
wncre it will not interfere with the operation of the vehicle but where it will permit a
good signal to be heard
CONNECTIONS
The power supply unit, as provided, is arranged for operation in a motor car where the
negative side of the battery is grounded In cases where this unit is to be used in a
rotor car where the positive side of the battery is grounded, it will be necessary to
reverse the rea and black wires inside of the unit. With the ne ative side of the
storage battery grounded, the red wire should be connected to the "0-5 terminal and the
black wire should be connected to the " " terminal With the positive side of the
storage battery grounded, the red wire should be connected to the " " terminal and the
black wire should be connected to the "J terminal.
A duplex cable is provided between the receiver and the power supply unit The two
sections of this cable should be connected together. A battery cable containing a fuse
is provided The terminal marked "hot" should be connected to the ungraunded side of
the storage battery The other terminal should be connected to the grounded side of
the storage battery The other shielded cable which enters the receiver housing at the
same point as the battery cable and the power supply cable should be connected to the
loud speaker At the other end of the receiver housing a black cotton covered cable is
provided which should be connected to the antenna lead in. Refer to Figure #1 for
these cable connections. The antenna lead in should be shielded and the shield soldered
to the bayonet connection beyond the junction.
ki' ? Fuse Y "me _*_* C

Page 2:

AGE 5~15
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Page 3:

PAGE 5~16 BOSCH; I
Testi-HS Data UNITED AMERICAN BOSCH CORP.
L - RF choke #104619
on. CUP wi 5, ` @ -A ` 6
L-1 R~P. Choke #105124 C29 - .1 dd. #105195 C51 - .001 #106775
TESTING
(a) ANTENNA: Substitute a piece of insulated wire 6 to 8 feet long and lay on ground;
if reception is normal, the regular antenna is at fault and should be checked for
groundifl opens; etc. t (Somewhat better reception should be expected with wire an-
(b) TUBES: Remove and test, or substitute kmcvm good tubes, one at a time.
(c) SPEAKER: Disconnect speaker cable from chassis by means of bayonet connector.
}',?es?iacro;s4 gergglnalg oidsgeakzi iwigh volt-ohrnxneter for continuity of voice coll.
fd) SECONDARY OF OUTPUT TRANSFORJVU-ER: With speaker cable disconnected, test with ohm-
metertbetween terminal #1 and ground. Reading of 0.5 ohms should be obtained on
(e) CHASSIS: Aztiter Chfxlik?llg ghihgompoxixex?ts listed above, test the voltages as they ap-
pear on vo age c ar an res s ance measurements as found in "Chassis Resis-
tance Chart". If any particular reading obtained is very different from the chart
re;>h.d];.ng,t&J?1tro;;1bjle is located in the portion of the circuit associated with the
po n s a ch h s d screpancy occurs. Referring to the circuit dia ram and lo-
cation drawings, each part making up the circuit may be individually iested until
the faulty part is specifically located.
f) MAGMOTOR: See Section giving complete magmotor service information.

Page 4:

BOSCH PAGE 5-17
/,_ UNITED AMERICAN BOSCH CORP. A1i5"'?n*' D458
' ~= TB R.F. Amplifier tube 75 Det_ A_v_?_ ani
\ 14.11. Ampnfying Tube
(R) 6 QE I 41 Power output tube
6A'I DET-(BC. tube
'78 LF. Amplifier tube
AL IGNNLENT INSTRUCTIONS
All of the adjustable condensers, commonly called trimmer condensers, are very accurate-
ly adjusted at the factory and will not need any further adjustments unless an I.F.
transformer is changed, or the adjustments tempered with in the field. Therefore, D0
NOT attempt to change the setting of any of the trimmer condensers unless it is
definitely known that adjustment is necessary, and a test oecill ator is available, then
proceed as follows: See Fig. #2.
1. Connect output meter across terminals of speaker voice coil.
2. Set test oscillator at 456 kilocycles.
5. Connect test oscillator lead to grid of LF. amplifier tube, type 78. (Point #l4).
4. Adjust condenser on primary of second LF. transformer, (Point #51) to peak on output
5. Adjust condenser on secondary of second LF. transformer, (Point #I52) to peak on out-
put meter.
6. Connect test oscillator lead to grid of detector-oscillator tube, type GA7 (Point #6)
7. Adjust condenser on primary of first I. F. transformer (Point #29) to peak on output
meter
63. Adjust.condenser on secondary of first I. F. transformer, (Point #5O) to peak on out-
put meter.
The above procedure lines up the I. F. stages properly, so that all that remains is to
tune the oscillator and preselector circuits to the frequency of the station it is de-
sired to receive. This has been covered in the section headed - TUHING

Page 5:

PAGE 5-18 BQSCI-1 _
Tuning Data UNITED AMERICAN BOSCH CORP.
The radio receiver as delivered will be tuned to the station frequency requested. Due
to unavoidable differences between the frequency adjustment made at the factory and that
of the station, it will be necessary to realign the tuning condensers slightly. One of
the following methods of procedure should be followed depending upon whether or not a
tuning meter is available. The method of tuning using a tuning meter is preferable
since more accurate adjustment is possible.
A. With Tuning Meter.
With the receiver in the motor car, and connected to the car antenna and battery, turn
the receiver mlly on and allow it to get into operation which will be indicated by a
slight hum heard in the speaker. Plug the tuning meter into the jack in the receiver
housing. If the station desired is not heard, drive the machine (with the radio set in
operation), toward the broadcasting station. When the station is heard, stop the motor
car and proceed as follows:
(a) Loosen the brass condenser lock nuts (which can be seen through the two holes in
the top cover of the housing) using a '7/16" socket wrench. This operation must be
observed or damage will be done to the tuning condensers when alignment is attempt-
ed with a screw driver.
(b) With a screw driver inserted into the slot in the shaft of the left hand condenser
(when the receiver is in such a position that the volume control is toward the
operator), adjust this condenser until maximum deflection of the tuning meter in
the direction indicated by the arrow on the dial is obtained on the station being
(c) Repeat operation "b" with the right hand condenser.
(d) Lock the condensers with the '7/16" socket wrench.
B. Without Tuning Meter.
With the receiver in the motor car, and connected to the car antenna and battery, turn
the receiver fully on and allow it to get into operation which will be indicated by e.
slight hum heard in the speaker.
If the station desired is not heard, drive the machine (with radio set ln operation)
toward the broadcasting station. When the station is heard faintly, stop the motor
car and proceed as follows:
(a) Loosen the brass condenser look nuts (which can be seen through the two holes in
the top cover of the housing) using a 7/16" socket wrench. This operation must
be observed or damage will be done to the tuning condensers when alignment is at-
tempted with a screw driver.
(b) With a screw driver inserted into the slot in the shaft of the left hand condenser,
when the receiver is in a position such that the volume control lmob is toward the
operator, adjust this condenser until the station is heard loudest.
(c) Reduce the volume by rotating the volume control knob on the face of the receiver
housing counter-clockwise.
(d) Repeat operations (b) and (c) with the right hand condenser.
(e) Lock the condensers with the '7/16" socket wrench.
Alignment by the above operations will be only approximate. To attain the exact align-
rrent required for saccessful operation proceed as follows:
(a) Drive the motor car (with radio operating with volume control on full) to a "dead"
spot or to a place sufficiently remote from the transmitter to produce a weak sig-
nal. In such a location repeat operations "a", "b", "d" and "e". In this case
under no circumstances should the volume of the signal be reduced by adjusting the
volume control Knob. Keep the volume control in its maximum position. Do not
neglect to lock the condensers with the socket wrench after alignment and F355
replac ng cover plates.

Page 6:

H PAGE 5 19
UNITED AMERICAN BOSCH CORP. F~?5i9*>>?n?? T?5t
G6 to cn _ #105676 11-17 750 ohms #105205 me _ _5 "P
(R) Volume control #105471
R5 __ 100,000 ohms 18 - .005~mtd. #105659
55 _ 500 ...r _ '-RB. - 500 ohm #105260
#105260 15 - 5000 ohms #105249
R19 - 100,000 ohms 12 - 2 mee- #105250
R16 - 10,000 ohms #100825 ' - 100.000 ohms #105270
R2 _ 213,000 ohms #100815 1 - 500 on #105260 Fix 3
R4 - W,0OO ohms #105274 R7 - 2000 ohm #105245 '
CHASSIS RESISTANCE CHART
All measurements made with Weston Model 665 volt-ohmmeter.
(Refer to Figs. 2 and 5)
MEASURE
SEQ-HON OF CIRCUIT BETWEEN POINTS OHMMETER READING
Antenna 0011 - Primary #2 Bc #5 0-5 ohms
Antenna Coil - Secondary ....... ? Ohhzs
R.F. Choke Coil ................... 0 s
0s?111ator C011 - Primary (Grid) .. #9 H: GND ' 1 ohms
.Oscillator Coil - Seconda;y1(Plate) 2; og;
First LF. Transformer - r mary .. 0
First LF. Transformer - Secondary in og
Second LF. Transformer - Primary . . .. . ... . .. o
Second I.F. Transformer - Secondary . .. . . ... . . _ 5 532 og
Output Transformer-Primary................... 0
*R.F. Amplifier _ Type '78 - Cathode to Ground #20 ez GND :soo ohms
Det.-Oscillator - Type 6A'7 - Cathode to Ground .... #21 & GND 500 ohms
Det.-Oscillator - Type 6A'7 - Osc. Grid to Ground .. #22 Ba GND 100,000 ohms
I.F. Amplifier - Type 78 - Cathode to Ground ..... #25 & GND C500 ohms
I.F. Amplifier - Type 78 - Screen Grid to Ground ...... #24 dc GND 100,000 ohms
Second Det. & Amp. - Type f/5 - Cathode to Ground ...... #25 & GND 5,000 ohms
Second Det., & Amp.-Type '75-A.V.C. Collector to Ground. #26 & GND 2,000,000 ohms
Second Det., & Am .- e 75 - Collector to Ground .... 17 Bc GND 500,000 ohms
Power Amplifier - Type 41 - Cathode to Ground ........ 27 &: GND '750 ohms
Power Amplifier - Type 41 - Grid to Ground ........ #28 8a GND 500,000 ohms
B+ Terminal to Ground ................................. #16&:GND 110,000 ohms
-me This measurement should not be made with the tuning meter connected ln the c Lrcuit.

Page 7:

AGE -20 BOSCH
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all auh la pravxdaa ln tha tap aaga ar aaah ar tha ana plataa. sn arapa ar aaaah all 3 Li lin For thu "non it i, "D to ,,m5,,,?1,, ah. at after nay -ark hu 0 (9
Us-sos, ar a llghh mxharal all ahaala ha put ln aaah auh at tha arplratlah ar aaah loco bg? dom gm the po", "nn elpwiau, u th, ,,,.?,",-, hah haaa raraavaa. U
haura ar uaa. saa ma. 5 rar tha laaatlah ar tha all aupa. Tha tamb"11ght uma;-al " _
all applxaa ta tha aa-aallaa htuaahala alla aala h amall apauu aaha y tha larga ra- _
rlaara ar patralaua praauata. Tala light hlharal all a <1 hat ha aauzuaaa with tha nra halt rhaula ha an-paataly aaaamhlaa whaa tha ragaatl?lrg 1| gahahlgramg-i::nagg:?:;=
light hauaahala alla af ma "apt:-ra" varlaty aa wlaaly aavartlaad. Thaaa "spam" alla tha pr-apar :lam axaxtatlaa. ma aaa ta dana an a a aa aaa
muah hat ha uaaa an tha llaht hall taarlhga ar tha hagaatar - ta aa aa alll tha aagaaalaug ataaa.
bnringa md "Hinton ?p?"M?n' lt h t tha an t auru; tha aa aa aparatloha wma marking
sam. sxanlhss ahaula ha nada aa aagaaaut alaaa ar tha rraraa aaa ngaat aa that tha ha t aah ha ra-
Tha hall hau-laga ara ham la plaaa by mama ar aaa aah-an laaataa la tha tap ar aaah position. the polar-my ar cha output alll ha x-avaraaa ma tha raaalvar win ha C
and plaza. Thara ara hwa aat aarawa lu aaah aan plana, tha tap aaa laaung tha lawar f`?f??"i?"- 2
aaa xh plana. 'azxtrara aara must ha ahaarvaa whaa thaaa rat aarawa ara ugh ahaa alhaa
aarawlha than aawh taa tlghlly alll aaatart tha hall haarlhga aufrlalahtly ta lharaaaa mms Um CB was L-1
aahaaaaaa ta* tha raaalvar and whlla tha arraaura la ratatlag. ah atar ahaula ha ,
lhaar-had xh tha hattary airauxt aa that :ha uurraht aralh may ha auaarvaa. whah tha '1'h? v?I1*=1?" 1f1"h1'=h W' ??"d?"?"" 'Hd ?"'?\?? "il" U" P7-'??'1 hi' I \i1l'?'=(C) "fins 2:
tha arrlalaaa ar th- magma: arm sr at 1| aaaaaaary ta raplaaa -ay ar zhaaa par a,
aaa aarawa hava haah praparly tlghtaaaa with tha hagaatar aoahaataa ta tha raaalvar, Y .6 ,_ t U, ,mt th, b. uma la axaatly tha aan pauzxaua an chu
tha aurraht dralh ahaulrl ha appraxlhataly 5.0 araparaa. Bath ar tha aat aahawa mat ha iii: :;';w:?'"?? T:????:?u mst 'UZ bo 0? ,M um hum "A gl _ Q, Ins" .M
'?"?"?d me" 1" "ms "'? ""'"' mat ha aaa la tha aaaa paazuaa aa tha arm ramad. ?
The aagaasar haa raar hruahaa, wa ah :ha lhput ar matar aaa aral twa aa tha autput ar U-'1
gaaaratar ana. Tha hruahaa 1h tha lhput ar hatar and ara haaa at aappar gaphlta aaa Z
aah ha dlatlhgulahad by thalr aappar aalar nam tha hx-uahaa la tha aueput ar gaharataa- , "N hu bm, ,.,,,,,,,? fa, 1n,,,,a;m, and th. aamutatara ara ruuaa ta ha ,..4
ana ahlah ara "aaa af aura aarhah. unaar ha alraumatahaaa muat thaaa hruahaa ha ln- due! tm, my b, ?1,,m,,, b, ,mine , cl," auth aa ,aaa with gaaallaa ar lr aaa- G
tarahahaaa. wha hruahaa ahaulu ha raplaaau araar :ooo haura af aparatlah. ra uaa nur; h "ms ,,,,, un, ,,,,,_\,,,,,,_ 1, ,M 9? naar. .ra haul, van .aa pltaaa,
tha hruahaa mara thaa :sooo haura will raault lg thalr waarlha aawa aa that thay mana it ,ui bf ,,,,,,,,,,, to ,hm ,,,,,n 1, , hah., ha,-.aa aa;-a la ha ahaarvaa aa
rahavxng tha aarawa whlah raatah tha halaara ta tha magmatar frame. Than hal tha
aalaar ah tha hruah halaah tarauual alia aa that tha :laxxhla an-a uaahaatlah ta tha Haag;
hruah la laaaaaaa aaa ahlla tha ralaar la haltah pull tha hruah aut af tha halaar. In W
la vary lmpartahh that tha prapar Ea-aaa af hruahaa ara uaaa aaa ha tauahaa ahauld ba O
uaaa axaapt thaaa ruralahad ny tha Uhltatl arharxaah saaah car-paratlaa. ar aa nga. 4 and 5) m
nth van ar n.: v uaaam-aa hatwaah palhe #as aaa gr , tha "rx" valeaga,
lh Umar ta lhapaac aarvlaa ma arhatura ia la aaaaaa ta raraava tha araatura aaaaaraa hataaaa raxat a and ga-a nth cha raaaxvax- aanuaataa, ahaulu ha appraaa- m
from tha aagaacar rrama. ma aa thla tha fallawlhg araaaaura ahaula ha ahaarvaaa uataly 115 valta.
ta) nlaaahaaat tha rad ahh hlaak auraa aahhaatad ta tha polarxty teminnl hlata aaa lr ana r-gaawr a tura :alla m mtata than tha aan- aa atlaha hava haaa mana Q
alaa tha wa graah wlraa aahhaataa ta tha hruahaa ah tha aidaa af tha magahatar. ,papal-ly .ha tha aultah ln th; ahaaagmhaa bath h "gang, zazchgzufiszlg af th;.:u;;\ O
lt thra cha uacar art ah a mph an a a a
(va) Haaava tha rlltar aaaarmly aauhtaa ah tha hraaa plata raatahaa ta tha tap ar tha xaaraamaugfnh tha rauaw ruhnneo chu-tl x
_ lr tha magaatar anaatura ratataa hut aa "za" valcaga 1| ahtasnaa hatwaah yea aaa gr , U-U
(a) xamava tha athar altar aaaauhly raatahaa ta cha tap ar tha rugaatar hy raaavxag th, nonainulq at tha an-ault thraugh tha gaaarator pm-non of rhw mn wr und tl" -
the W0 "lf-"pains aaraaa #ao aaa #41 ahawh la nz. #s. aaaaa?ataa rgxra, ahaum ha ahaavaa :nh ah a tar Lu aaaaraaaaa with tha rallawlna
Pla" t"t?"1"g "?'f?"" all raaaauramama mea with waaaah Maaal ans val:-ahaaaatar. (narar ta nga. A aa 5)
(a) Rama uha twa uppar hall haarlha hat aaa-au am laaaau tha tra lawar aat aarawa mm,"
(r) Ranma tha aaa plata ta what tha flltar aaaahly 1| attaahaa. complet, Mow, cum" *as _M mm 1 ,M
_ run
(51) mt "' H" ""'""'"'?? gxmialtguiflgh?rgtvghglfgauit :rig gag eco amused.
A 1 parta ar tha par/ar uhlt ara han avallahla rar zaapaatlah. "Ba ?,_,.c.,1? Mp, amy, ?54 aaa #se 220 ohm
. _ run 1
that a uraa a hha law valaaga alaa ara aahaaata aa thay -'ara arlgihally aaa uaa 1 "M 1, d in t M 1, 1. aan.
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