Bendix Radio Div. 1217B Schematic

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Product Information:
Model:1217B
Manufacturer:Bendix Radio Div.

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:

Bendix 69 Series

This model appears on pages 19-1 through
19-8 0] Rider'a Manual Volume XIX. The
location of trimmer C3c on gang capacitor in
Figure 8, Trimmer Location Diagram,
should be on terminal 4, rather than ter-

Air King A400. Minstrel: Ch. 470

This model appears on page 16-1 0/
Riders Volume XVI. The following mate-
rial should be added to that which ap-
pears in the Manual. The Voltage and
resistance measurements follow.

'mal ml v'an 20,0o0 Loco axsra'r/lkcl
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'122 +122 over Sour

Atl. aasrsrillcas Ill olrlls mlmss o'rllKawIsa llo'ran.
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I-F Alignment

Connect an output meter across the
voice coil4 Connect the signal generator
to the primary of the antenna transformer
through a 10()qu capacitor.

Set the signal generator to 455 kc and
fully mesh the receiver tuning capacitor.

Keep the receiver volume control at
maximum and the output of the signal
,generator sufficient to give a readable
deflection on the output meter and adjust
i-f trimmers C15 and C14 for maximum.

Tor rlloNr vlrw "'

The lop ,front view of the Air King A400,
showing tubes and trimmer locations.

R~F Oscillator Adjustment

Keeping the same setup as used for
Lf alignment, set the signal generator for
1600 kc and adjust oscillator trimmer 013
for maximum output.

Set signal generator and receiver forl
1400 ko and adjust antenna trimmer 012
for maximum output.

' The parts layout and alignment points
are shown in the accompanying diagram.

The bolLam front m'ew a] the Air King
A400, showing parts layout.
Bendix 12l73. 12171)

Model 1217B appears on pages 19-9
lhl'ol/.gh 19-19 0/ Riders Manual Volume
XIX and Model 1217D appears on pages
1930 through 19-33 of Ruiefs Manual Volf
lame XIX. Hum can be corrected by
removing the shielded lead between the
tlro chassis from the plug assembly and
running it in through a separate connector.
All of the hum pickup is taking place at
the eight-prong plug on the radio chassis.
With the cable running in through the
chassis about two inches away from the
plug assembly, the hurn level is so low
as lo be almost immeasurable.

This model is thesame as Model 9-209
appeal-ins on paves 19-19 through 19.21 sf
Ihder's Volume XIX.

This model is thesame as Model 7151, ap-
pearing on pages 18-12 of Rider's Volume
XVIII, except for the following changes
Capacitor C55 (10 ani) connected from
pin 1 of the 7178 tube to ground has been
removed. The 0.003-uf capacitor C9 has been
changed to 1500 auf.

The position of the trimmers has been
changed. Looking at tho front of the set,
they are: C49 (broadcast trimmer), C51
and C52 (f-rn r-f trimmer).

A coil has been placed in the cathode
lead of the 7Q7 tube before this lead is
connected to C50. Capacitor C53 (15 auf)
has been changed to a variable capacitor
and is now connected between L5 and
ground, instead of across L5. The junction
of C50 and the cathode lead of the 7Q'I
tube is connected to the ground side of
this capacitor.

The 22,Mohm resistor, R51, connected
between R13 and ground has been elimin
ated. The side of ClB that is not connecteo
to R13 is grounded directly. The side of
the tone control, R14, previously connect
ed to C19 has been left open. R20 has been
changed from a 470,000-ohm resistor to a
l-megohm variable resistor. The movable
arm of R20 is now connected to pin 5 of
the 7F7 tube, and one side of R20 is con-
nected to the junction of C21, C22, and
023. C56, the 1500-plnf capacitor across the
filaments of the SBAG tube, has been re-

The first two models appear on pages
18-6 through 18-12 0]' Riders Volume
XVIII. The following changes have been
mode in production. Model K-ZSQ incor-
porates these changes. _

A 3-gang tuning capacitor is used, neoes
sitating changes in the r-f amplifier circuit.
'The 100,000-ohm resistor connected to the
grid (pin 1) of the BAGS r-f amplifier has
been changed in value to 1 megohm. The
load which was formerly connected from

CHANGES PAGE 20-1

the bottom of this resistor to the junctionl
of resistors 7 and 8 (1 megohrn and 4.7
megohms, respectively) is now connected
directly to resistor 4 (100,000 olurls) and
to D5 of switch section 2 roar. Resistors
7 and 8 have been eliminated.

The band-pass coil and the Htl-auf
capacitor which were connected between
the plate (pin 5) of the GAG-5 lube and
the third grid (pin B) of the 6SB7Y oscll-
lator convertor tube have been removed.
A connection has been made from the
plate of the 6AG5 tube through a lUO-plai
capacitor to DS of switch section 2 rear.
The third grid of the SSB7Y is stlll con-
nected to D2 of switch section 2 rear.>
The 100,000-olllrl resistor, which was for-`
merly connected between D1 of switch
section 2 rear and the junction of D4 ol
the same switch section and the 1000-ohm
resistor, has been removed. There is a
connection from D1 of switch section 2
rear and C1 of switch section 2 front,
indicutfd on the schematic by the black
dot on these connections.

The 0,005uf capacitor connected to C7
of switch section 2 front has been removed,
as has the wave trap and 100an capacitor
connected lo C1 of the same switch
section. The third section of the ganged
tuning capacitor is connected between Cl
and ground, and is shunted by the i-m
converter trimmer, and also by a bandY
pass coil <49) in series with a 0.05-ai
capacitor. A 100,000-ohm resistor is con-
nected from the junction of this capacitor
and coil to D4 of switch section 2 rear.
A 0,01-af capacitor in series with a coil
is connected from this common ground
point lo the junction of the 47000hln
resistor and the r-l choke in the plate
circuit of the 6AG5 r-f amplifier. A 47,000-
ohm resistor has been connected in the
line going between A3 of switch section
1 front and the junction of the 47,0000hm
resistor, the 470,0000hm resistor, and the
100-nnf capacitor in the filter circuit of
the a-ni detector.

The following step should be included in
the a-m alignment table on page 18-1
between steps 6 and 7.

Step Connect Set generator Set Gang

Generator Al At
Binding Post
Adjust To Oblain
BC R-F Trimmer Maximum ,
Output

The following additions should be made
to the parts list.

Ref. Part. Description

21 25456 ell-asf ceramic capacitor

34 25182 lil-af tubular Cnpacitol, 200 volts

so 26271 Tunlnz capacitor

46 13166 Loop smenna miouse, .083; Kose)

le mal Imp antenna (GK-oss. .057;

41 38932 F-m antenna wil

50 25181 0.05-uf tubular capacitor. 200 volts

sl :tacos rum maven" wil

sz 38934 nm cseillatur coll

'ls was Pilot lamp, zso mi (mom. .naar

'ls 42m Pilot lamp, Males ss (K-'sm
22m Pickup cable (GK-usa, oss, K-call
zzlcu Pickup cable lGK-css. oss. - s1~

slizl A-m dlsl glass (renal, -oasl
31122 Fun ulal glass lK-osl, -osai
class A.m dial glass (li-289)
:um dial glass 4K-sz)
allal Dial sssutcheon (Keel. -ossl
$2192 DIll drive 60rd (45 inches)
stool Band swivel. lever llc-om, -ossl

54310 Band switch lever (lt-259)
59451 Knobs (lt-054, ~oasl

92229 Dial background (Ii-084)
60565 Eseutchecn backing (lc-289)

H-zsll-l Cabinet and carton for K-osl (walnut)
H-zss~2 Cabinet and carton for K-om (blonde)
H-zas-l Cabinet and carton for K-oxa lwnlnntl
Hass-2 Cabinet and canon lm- K-ose lblcndel
11-315 Cabinet and nal-ton lor K-zss

? John F. Rider

Page 2:

l3ENDIX PAGE 19~9

MODEL 12173

BENDIX RADIO DIV.

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Rider

Page 3:

MOD L 121

BENDIX RADI

REFE RENCE MARK

Control Layout

(C)John F. Rider

(R) Mao

Component Diagram-Bottom View of Tuner Chassis

CHASSIS CODE CHANGES

CODE "A" AND UNCODED CHASSIS
First audio amplifier Was a 6J5.
FM antenna was connected to a tap on the
antenna coil (L1) instead of by link.

CODE "B" CHASSIS

Some chassis used a 6J5 and some a 6SN7 as
a first audio amplifier. Tone compensation
network, R54 and C77, removed from phono
input lead. RF choke, L9, added in plate cir-
cuit of 7F8. R38 in D.A.V.C. circuit of
ratio detector changed from 8200 ohms to
10,000. FM antenna input same as in code
"A" chassis. Cathode resistor, R12 and
capacitor C72 in first 7AH7 removed and R15
connected directly to ground.

CODE "C" CHASSIS

Included all previous changes.
FM antenna link coupled to antenna coil L1.

Page 4:

BENQX PAGE 19711

F?L-"e'EImDK' RATDI DIV." MODEL 1211751]
Era

Component Diagram
Bottom View of
Amplifier Chassis

(C)John F. Rider

Page 5:

9AGE 19-12 BENDIX

if() DEL 121 YB

It is not necessary to remove the two chassis
from the cabinet if the FM channel only is to
be aligned. An FM test socket is provided on
the chassis sideplate (facing outward in normal
mounting position) at which the various volt-
ages from the ratio detector are available for
either meter or oscilloscope measurementsA

If the BC and SW channels are to be aligned,
it is advisable to remove the radio chassis from
the cabinet in order to gain access to the BC
and SW AVC voltage used for output indicationA
It is rather difficult to align the BC and SW RF
and IF sections when the volume control is full
"ON" because of background noise accompany-
ing the high gain of the audio amplifier. A DC
vacuum tube voltmeter connected to the ~junc-
tion of R20 and C10 (lug 3 of Sl-EwSee Figs.
9 & 10) will provide an accurate and stable in-
dication of RF output, at the AM demodulator.
for alignment of the BC and SW bands.

Unless the various circuits of each channel
are very much out of alignment, adjustments
made in the SW circuits will not affect the BC
circuits and adjustments made in the FM cir-
cuits will not alter either the BC or SW circuit
adjustments. However, if any of these channels
are badly out of alignment necessitating con-
siderable adjustment, it is best, after these
adjustments have been made, t0 go back and
check the adjustment previously made on the
other channels.

An un-Inodulated (CW) signal of the proper
radio frequency may be used for alignment of
all three channels (BC, SW, and FM), but it
is convenient to use a 400 cycle AM signal dur-
ing alignment and occasionally advance the
volume control to be sure the correct signal is
tuned in.

Before making any adjustment, allow the
receiver and signal generator to warm up for
at least five minutesA IMPORTANT: All ad-
justments must be made in the order in which
they are given; i.e., the BC band must be
'aligned first, followed by the SW, and last, the

INSTRUCTIONS FOR REMOVING
THE CHASSIS

If, for any reason, it is necessary to remove
the radio chassis from the cabinet, proceed as
per following instructions:

Remove the power cord plug from the
wall receptacle, and remove~ all control
knobs and push-buttons by simply pulling
them straight up from the panel. The cabi-
net back cover and AM loop assembly may
be detached from the chassis by pulling the
loop leads out of their receptacle on the
chassis, after the small wood screws hold-
ing the assembly on the cabinet have been
removed. The FM antenna is disconnected
from the chassis by removing the three
prong plug at the rear of the chassis. All
power cables and leads may be disconnected
at convenient plugs and jacks in the
chassis. The speaker is connected to the
amplifier chassis by a 5-prong plug on the

(C)John F. Rider

BENDIX R'ADIO Div.

After all connecting leads and cables have
been disconnected from the chassis, remove the
four hexagon-head machine screws which hold
the chassis mounting rails in the cabinet. The
two upper machine screws are removed from
inside the record changer compartment. The
two lower bolts are located below the radio

chassis and removed from the chassis side 0f'

lthe cabinet. Note: When replacing the chassis
in the cabinet, be sure dial glass is up snug
against the control panel when the four mount-
ing screws are tightened and that they are
tightened securely,

PUSH-BUTTON ADJUSTMENT

The mechanical type of push-button tuning*

used with this receiver makes possible the
selection of any one of eight pre-selected
stations. Any push-button may be adjusted to
select any station in the three tuning bands.
However, more accurate tuning of the SW and
FM stations will be obtained if the lower four
buttons E, F, G and H, Figures 2 and 3, are
used for stations within these bandsA

1, Remove all push-buttons by pulling
straight up from the panel.

2. Manually tune in the desired station.

3. Release the screw adjacent to the push-
button shank and push the shank in firmly
as far as it will go while holding the tuning
control knob.

4. Release the shank and tighten the locking

5. Rotate the tuning control to a different
position and check the push-button setting
by_aga1n depressing the shank previously
adJusted. The tuning dial should auto-
matically return to the stations previously
tuned in. However, in some cases it may
not be exactly on the peak frequency of the
stations. In such cases, continue as follows:

6. Re-tune the station manually to its peak
frequency, and note whether it is necessary
to increase or decrease the frequency set-
ting for optimum tuningA

7. If it is necessary to increase the dial
frequency setting, then the dial should be
set_at an additional increase beyond the
optimum point (approximately the amount
of the increase) and procedures 3, 4, 5 and
6 repeated. The push-button should then
tune in the station exactly on its peak

8. If it is necessary to decrease the dial
frequency setting, then the dial should be
set at a lower frequency from its optimum
point (approximately the amount of the
decrease) and the procedure in 3, 4, 5 and

9. Repeat the above procedures for the re-
maining seven push-buttons.

After the push-buttons have been set up as
previously described, the proper tab with its
_transparent cover should be inserted together
in each push-button knob. The push-buttons
should now be placed on the proper shanks.

Page 6:

BENDix PAGE 19-13
MODEL 12173

BENDIX RADIO DIV.

ALIGNMENT PROCEDURE
MODEL 12178

EQUIPMENT REQUIRED

Signal Generator

Vacuum Tulie Voltmeter
DC up to approximately 20 volts. Ground,
or minus, must be isolated from the power

FM Test Circuit Plug
See Fig. 4 for details.

.01 mfd. and 50 mmf. (or less) capacitor
used for connecting signal generator to

Alignment Screwdriver
Must be 10021 fiber and preferably over

Alignment Socket Wrenches
One l/L" hexagon - 100'); fiber, 8" long.
One 3/8" hexagon - 1007? fiber, 6/' long.

If the 3/3" wrench has a hole through the

handle of sufficient diameter tu permit in-

Serting the alignment screwdriver, the

locking nuts on 1.1, L2 and L3 can be

loosened or tightened at the same time

these padders are adjusted with the screw>>

driver inside.

AM ALIGNMENT
Turn receiver on and allow to Warm up for

at least 5 minutes. (Input voltage, 117 volts
60 cycle AC). Set volume control to minimum,
bass and treble controls full counterclockwise,
range control to BC (third from most counter-
clockwise position), tuning gang fully closed.
Set dial pointer to Reference Mark at low Fre-
queney end of dial as shown on Fig. 3. If built-
in AM loop antenna is disconnected, the two
contacts of the AM antenna input jack located
on top the chassis must be shorted together.
C69 and C4 should be adjusted with loop con-
IF CHANNEL

1, Short #5 terminal on gang (CZ-F) to
chassis. See Fig. 2.

2. Set signal generator to 455 KC, CW or AM,
and connect to #3 gang terminal (CQ-E)
through a .01 mfd. capacitor. See Fig. 2.

3. Connect low range of V.T.V.M. to ljunc-
tion of R20 and C40 (lug 3 of switch Sl-E
is a convenient iiointhee Figs. 9 & 10),
and chassis ground, and adjust signal
generator attenuator to produce approxi-
mately 2 volts of AVC on the V.T.V.M.

4. Adjust C3613, CSGA, CfSlB and`C31A for
maximum meter reading, keeping signal
input to produce approximately 2 volts
AVC. Repeat these adjustments until no
further improvements can 'ne made in any
one of them. NOTE: All adjustments
must be made with a completely non-

BC OSCII.I.A'I`0R ALIGNMENT

1, Remove short from 3,:5 gang terminal._

2, Move signal input from #3 gang terminal
to external AM antenna terminal (JI)
and set input frequency to 1475 KC CW
or AM. (V.T.V.M. remains connected as
for IF alignment.)

3. Set tuning control to 1475 KC.

4. Adjust C24, (BC oscillator trimmer) for
maximum meter reading.

5. Set signal generator and receiver dial
pointer to 580 KC.

6. Adjust BC oscillator padder C26 for max-
imum meter output. Repeat steps 2 to 6
until oscillator tracks correctly. Any change
in C26 will necessitate a readjustrnent of
oscillator trimmer C24.

RF AND ANTENNA ALIGNMENT
FOR BC BAND

1. Change coupling capacitor connecting
signal generator to AM external antenna
terminal from .01 mfd. to 50 mmf. or less.
(Terminals of AM loop input jack must be
shorted together if loop is disconnected.)

2. Adjust signal generator and receiver tun-
ing control to 1475 KC.

3. Adjust BC oscillator trimmer, C24, BC RF
trimmer, C1'2 and BC antenna trimmer,
C69 for maximum output. (If AM loop is
disconnected, C69 should be adjusted after
chassis is installed in cabinet.)

4. Check overall tracking at '580 KC and
965 KC. Maximum output should occur
within thc a 10 KC of the indicated dial
pointer reading. If it falls outside these
limits, the plates of the gang rotor should
be bent to correct tracking. but this is
a difficult operation and should be at-
tempted only by experienced technicians.

5. Repeat steps 3 and 4 until no appreciable
improvement can be obtained by additional

S\V ALIGNMENT

1. V.T.V.M. and signal generator connected
as for preceding step 5 of BC RF and
antenna alignments; range switch in SW
(most clockwise position).

2. Set signal generator and tuning control to

3. Adjust SW oscillator trimmer (C23). SW
RF trimmer (C11). and SW antenna
trimmer (C4) for maximum output. NOTE:
If circuits are badly out of alignment, it
may be necessary to apply the signal first
to terminal #3 on gang (C23) until
oscillatoi' is brought close to correct align~
ment. The local oscillator frequency in the
recei\ er should be adjusted to the RF plus
the IF (not below the RIP). The correct
position can be determined by turning C23
all the way in (clocknise) and then out
(counter-clockwise) until the second peak

4, Tune receiver and signal generator to 6
MC and check calibration and output.
Maximum meterreadingshouldbeobtained
with the dial pointer v 100 KC ot the 6 MC
dial reference niark and an AVC output
voltage not less than one-halt` of the AVC
voltage obtained at 15 MC. providing the
same voltage is applied tu the antenna iii
both cases.

(C)John F. Rider

Page 7:

PAGE 19-14 BENDIX

MODEL 12178

BENDIX RADIO DIV.

FM ALIGNMENT

FM IF CHANNEL

Set range control to FM (second from
most counterclockwise position) and tun-
ing gang to maximum capacity (closed).
Insert special FM test circuit plug, detailed
below, in test circuit jack J 2 located on left
side of radio chassis. See Fig. 2.

VIEWED FROM
PIN END OF PLUG

>> Test Circuit Plug

Connect V.T.V.M. ground or "minus" lead
to point "B" and "plus" lead to IF pin on
test circuit plug.

Connect signal generator to #4 (CZ-B)
gang terminal through a .01 mfd. capacitor
and short #6 gang terminal (CZ-C) to
chassis, See Fig. 2,

Adjust output of signal generator to obtain
10.7 MC CW and approximately 4 volts on

Adjust C358, C35A, C288, CZSA, and C46A
for maximum meter reading, repeating all
adjustments several times. NOTE: It may
be necessary to apply the 10.7 MC signal
to pin 6 of the 1st IF tube (7AH7) and
adjust C358, C35A, and C46A before apply-
ing the signal to #4 gang terminal and
adjusting C288 and C28A.

Change V.T.V.M. "minus" to point "A"
(center tap of two 100 K resistors) of test
circuit jack and "plus" lead to audio

Turn signal generator OFF and set meter
to Zero when no signal is applied to IF.

Turn signal generator ON and adjust C468
for zero output on meter. It may be possible
to obtain two or more points of adjustment
at which a zero meter reading can he
obtained. The correct one is the one at
which the meter passes through zero most
sharply with the minimum rotation of

Alternately adjust C46A (3rd FM IF pri-
mary) for maximum DC voltage across
pins "B" and "IF" (meter connected as for
previous IF alignment), and C468 (3rd FM
IF secondary) for minimum DC Voltage
from point "A" to "audio" NOTE: In
making this adjustment, the signal input
level should be adjusted to provide approxi-
mately 6 volts DC across pins "8" and "IF"
of test jack.

Remove short from #6 gang terminal and
change signal generator input from gang to
FM antenna jack on rear of radio chassis,
applying signal through FM dummy an-
tenna circuit shown in Fig. 5.

or simon. cannon

FM Dummy Antenna

V.T.V.M. should be connected from point
"8" to "IF" of test circuit plug.

Adjust signal generator and tuning control
to 106 MC and output to produce approxi-
mately 8 volts on V.T.V.M.

Using a completely non-metalic 1A." hexa-
gon socket wrench, adjust FM oscillator
trimmer (C22), FM RF trimmer (C10)
and FM antenna trimmer (C1) for maxi-
mum output voltage read on V.T.V.M.,
rocking the tuning gang slightly as these
adjustments are made.

Set signal generator and tuning control to

Adjust FM oscillator padder (L3), FM RF
padder (L2) and FM antenna padder (L1)
for maximum output voltage. The %"
locknut on these padders must be loosened
before adjustments are made and tightened
after adjustments are completed.

Repeat steps 14, 15 and 16 until maximum
output voltage is obtained with the dial
pointer at 90 MC and 106 MC when the
signal generator is set at these respective
frequencies. Any adjustments made under
step 16 above must be followed by re-
peating the adjustments required under
step 14.

Dial S tm'nging Diagram

(C)John F. Rider

Page 8:

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(C)John F. Rider

Page 9:

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Page 10:

BENDIX PAGE 19~17

MODEL 121713

BENDIX RADIO DIV.

Rider

(C) John F.

Page 11:

PAGE 19-18 VBENDIX :mamma nav-uh
HODEL 1217B BENDIX RADIO DIV.

BAND~SWITCH SHOWN
AT 3" POSIT(ON CLOCKWISE .
BROADCAST BAND

AUDIO

aANo-swwcH SHOWN
AT 4'" POSITION cLoclesE.
SHORT WAVE BAND

o John F; Rider

Page 12:

BENDIX PAGE 19-19

BENDIX RADIO DIV.

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