United American Bosch Corp. 305, Ed. 2 Schematic

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Product Information:
Model:305, Ed. 2
Manufacturer:United American Bosch Corp.

Schematics Content:

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Page 1:

BOSCH
PAGE 7 8
UNITED AMERICAN BOSCH CORP. Schema.ti.c,Vo1'bage
_ Parts
MODELS assed.:-405 _
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(C).Tohn F. Rider, Publisher

Page 2:

PAGE 7~4- BOSCH
MODELS 505,Ed?2,405 -
Alignment
AMERICAN-BOSCH RADIO MODELS 305Bd.7>>-405 gj?g?j
, SERVICE NOTES H; ;? ge
GENERAL DESCRIPTION LF- AD-TUSTIRWI' 456 K-C~ is Z Z I .
The Models sus Bd. 2 and 405 are rivs-tune 1. cemmest eutput veltmster to speaker. J' I Z Z;
superneterodyue receivers whose circuits 2. Sat volums control nt maximum position. ?2 Z 2 I _
comprise a combined first detsctcmoscil- 5. Set signal generator at 455 K.C., and Q ~ : ; ;
`1at0r, enimtsrmsiete frsquancy smpnfier, eeumeet genes-stef output lsad to gsm rn 3 t . . .
ume control _ rn-st audio empunes-, an 4. Adjust eemaeueers A at B on coil nearest O _ . . . . 1
output stsgs sus s 1-eetirier. back of eet fer mextmum output as xmas- [II 3 2 I 5 I _
eetea on output velteetes-. seeeitivitv <1 =t 3 ; ; ; ;
The receiver is dssigned to operate over at this point should be 500 microvolta. Q ... . . . . .
ths bz-osdcest bend covering the trsquem- 5. Connect eigusl genes-stem output lead -te E _I C C I Z
siee from 550 te* 1'72o K.c. gs-se ef ns-st aeteetes. sejuet ees.- 5 ; ;_; ; ;
The ledel 505 Ea. 2 Ls e personal model ` eutpmt ee Lmdieeted on output veltmetex-. H Z Z Z I I
with the speaker meumtea on the ttessie. m _ ; ; ; ; ;
The lodel 405 is s emsele model with s , Q 2 ; 1 5 I 2
separate speexer. 1. swxttn generator to R.F. ma set at O 3 3 ; ; ; 3
INE, STM]?N1S 2. Connect generator lead no antenna. I I I I I I
L UP CAPACITOR ADJU 5. Set scale no 100 with gang closed 3 ; ; 3 ; ;
'ro align the Model 505 Rd. 2 or 405 f18h?1Y~ 3 ; 3 5 gg
chassis, it is assefntial to use s high 4- Adlnvt wndnnner sans t? B Beale reed- g . . . . _
great mcdulsted oscillatur end sensitive ing or 21 and peak Oscillator trim 0011- 13 I Z I 2
Uutput met", The R_p_ Signal 1-,Q into denser. (This mmdenser is the back -.4 _ . ; _
the rscaivor must be very week or it 11111 nlisnmant Screw nn sane nondennur-) .2 Z I . Z
cause the A.v.c to rumetxem, ments; ees- 5- T? chunk LF- nl-imnent, connect I-I-'~ _gig ; ; ; ;
meet alignment impessnus. The sensitivity Bishnl zenerntnr to mhnnn: snnnnd ge ~ >> ; -
of the output meter must be sufueient to bnm?n1? Shwld be nb 912 K~C~, third 2 2 Z .,
give sstisfsetery reeeuug with e 1" nt 1569 K-0- gg: ;*=g
,L@,1_ 6. Adjust preselectcr trimuwr condenser e .Re
s (em ft-est ssction of gets condenser) te g?g gv g
sefes-e attempting to .nge e 1-eeeiver, tho nnrimnn ?"tl7'1t~ D *gag 5,
sez-vue mem should femnies-ue mmeen 1"0'l'F= If if in n==?==n='r f=? 1-=\P1'?'? =??- ?>>-1 no
with the general leyeut or the chassis, "I-ETVUY Bt 50? ?1'1??? K-?~>> l>-\f lt 170? LG- #hd gg 3435
TUNING CONTROL V0|-UME CONTROL
ZND DET POWER ANTENNA CONNEC N i
_- , a RECTIFIER
(C)John F. Rider, Publisher

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