Motorola 52C1A Schematic

Get a print!
Price: $7.20
In stock
Product Information:
Model:52C1A
Manufacturer:Motorola (Galvin)
Description:HS-309

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:

MRM Mm MODELS 52c1, 52C1AJ
TIME HAND D|AL. SCALE Ch.
Rnmo Worr-on SWEEP "a" votume
AUTOMAUC KNOB SECOND HAND SET ALARM
CONTROL TUNING
GENERAL INFORMATION
TYPE - AC fable \'!\0dEURl S\lpEURrhEURtel'Odyne with self-contained
electric clock for controlling automatically the op-
eration oi the radio.
POWER SUPPLY ' Operates from 117 volts, eo Cy/Cle, Bl-
COI-'OR ' Walnut ternating current only. Power consump-
TUNING RANGE - 535 to l620 Kc IF - 455 Kc
TUBE COMPLEMENT - Type Function
IZBE6 Converter
IZAT6 Det, AVC Hr AF Amp
50C5 Power Amplifier
35W4 Rectifier
CLOCK - Telechron self-starting electric clock with
Motorola face and hands.
OPERATING INSTRUCTIONS
The locations and functions of the clock and radio con-
trols are shown in the photo above.
NORMAL RADIO OPERATION
Knob "A" on the clock turns the radio on or off. Select
stations with the TUNING knob, and adjust volume with the
VOLUME control.
A built-in loop antenna eliminates the need for an out-
_siae antenna an most iaeaunns. when receiving 3 weak sts-
tion, rotate the receiver slightly for best signal strength-
If additional pick-up is necessary, connect an external an-
tenna to the radio by following the instructions printed on
the rear panel. CAUTION: Never connect the radio chas-
sis to a water pipe, radiator, or other ground.
CLOCK OPERATION `
The clock will start as soon as the receiver is plugged
into an electrical outlet. To set the hands to the correct
time, rotate the TIME SET knob (on the rear of the radio)
in a clockwise direction only.
ALARM OPERATION
To set the alarm, pull out knob "B" and rotate
counterclockwise direction to the desired time on the
dial scale. The alarm will ring for one hour, or unt
alarm
il knob
"B" is pushed in. The alarm function is completely inde-
pendent oi the other controls on the clock.
AUTOMATIC RADIO OPERATION
The dock controls may be pre-sez to turn the radio on
automatically at any time up to twelve hours in advance.
Pull out knob "B" rotate it Counterclockwise to
sired time on the alarm dial scale, and push the knob back
in. Rotate knob "A" first to the "OFF" position and
then to
the "AUTO" position. At the pre-set time, the radio will
come on and win continue to play until turned aff ma
The alarm will ring also if the knob "B" is left pull
The radio will come on first and. aiter an interval o
ten minutes, the alarm will ring.
I about
(C) John F. Rider

Page 2:

PA E 23-68 MOTOROLA
MODE LS 52C1, 52C1A,
NOTE: It is recommended that an isolation transformer be
placed between the power 1ine and the receiver to avoid hnrn
and electrical Shocks. If an isolation transformer is not
available, connect the low side of the signal generator io
chassis through a .1 mi capacltor.
1. Connect e low range output rnezer across the speaker
voice coil.
Z. Connect the low side oi the signal generator to chassis.
3. sez the signal generator for 400 eycle, 30% modulation.
4. Turn the receiver volume control to maximum.
5. Use e small fibre screwdriver fer aligning me ur end
diode translcrrners.
6. As stages are brought into alignment. reduce the signal
generator output to e level wrneh produces Lees than .40
volts (_ 05 wans) across the voice coil to avoid overloading
the reeeiver.
7. See Figure 1 for adjustment locations and the following
chart for procedure.
CHART
DUMMY GENERATOR
CONNECTION
GENERATOR
FREQUENCY
GANG
REMARKS
IF ALIGNMENT
Grid oi Conv.
RF ALIGNMENT
Grid of Conv. |620 Kc
sr EP ANTENNA
4. Radiation 1eep*
Fully
open
Fully
closed
open
Tune for
max
SETTING ADJUST
Aajner fer rnnxarnnnr.
sem pointer to hori-
Adjust fer rnerirnnm.
Adjust fer maximum.
*Connect generator output across 5" diamefex-,_ 5 turn loop and couple inductively to receiver loop. Keep loops at least
SEC (TOP) SEC (TOP)
ANT
I AMP Q/Q AMP RECT
FIGURE 1. TUBE AND TRIMHER LOCATION
(C)John If. Rider

Page 3:

MOTOROLA PAGE 2 -
SERVICE NOTES
The eiaeaare of this receiver is eorroeefe.-1 directly to me
power line. when Operating the chassis outside of its cabi~
net, oae an isolation transformer between me power line
and the receiver to reduce me possibility of an electrical
TO REMOVE RADIO CHASSIS FROM CABINET
1. Pull. off the two radio control knobs.
Z. Remove the three hex head screws which hold the loop
to the cabinet.
3. From the back of the cabinet, remove me two hex head
screws at the rear edge ofthe radio chassis.
4. Slide the radio chassis and loop from the cabinet.
5. Disconnect the power leads to the radio chassis.
TO REMOVE CLOCK FROM CABINET
I. Remove the radio chassis as above.
Z. Pull off the two clock control knobs.
3. From the back of the cabinet, remove the three hex head
screws which hold the clock and its fibre insulator.
4. Carefully remove the clock, to prevent damage to its
hands or face.
TO REPLACE CLOCK D1A1_. BACKGROUND
1. Remove me elook (rom the cabinet as above.
z. Carefully pon off ure nrree harida.
3. Remove the alarm aiai and dial background.
MODELS 52C1, 52C1A
//" ""\\\ DIAL BACKGROUND
/ ~/ PLATE
NOTE WITH GANG FULLY
GANG CLOSED SET POINTER TO
,_ HORIZONTAL
FULLY CLOSED POSHWON
DRIVE CORD
4 TURNS
TUNING *
FIGURE 2. STRING DRIVE DETAIL
4. Install new backgrounde
5. 'rum the radio control shaft to "AUTO" poamor..
6. Slowly rotate the time set shaft clockwise until the
switch contacts behind the radio control shaft close.
7. Reassemhle the alarm dial and three hands. Set all the
hands to indicate IZ o'cloCk. Set the figure "IZ" on the
alarm dial to index with the small pointer on the hour hand,
8. Check the automatic operation to be Sure the switch Con-
tacts close at the time indicated on the alarm dial.
FIGURE 3. PARTS LOCATION
(C)John F. Rider

Page 4:

AGE 23-70 MOTOROLA
MODELS 52C1, 52C1A,
PARTS LIST
NOTE: When ordering parts, specify model number of set in addition to part number and description of part.
flef. Par: Lin Resistors
No; Number Description Price "ii
Note: A11 resistors are insulated carbon .type
'CHASSIS PARTS - ELECTRICAL unless otherwise specified.
Capacitors R-1 6116028 22,000 20% 1/2W. . . . . .doz 1 .20
C-l 1913610820 Variable: 2-gang; with pulley 2.85 R-3 GR3927 2,2 meg 20% 1/ZW. . . . . . .doz 1.20
C-2 8119821 Paper; .05 mf 200V .'. . . . . . . .20 R-4 18A6000lB Volume c0ntl'01: 1 meg. . . . . . . .30
C-3 8R490232 Molded paper: 47,000 mmf 400V .30 R-5 6R2109 10 meg 20% 1/27| . . . . . >> . .doz 1.20
C-4 21B482S47 Ceramic , multiple : 2000-220- R-6 SR6032 470 , 000 20% 1/ZW _ . ..... doz 1 . 20
C-6 23B600855 Electrolytic 1 50-30 mf/150V. 1 . 10 R-9 6R5683 27 10% 1/2W . . . ~ . . . . .doz 1 .20
Clock
. Transformers
E-1 5917610825 Electric Clock Assembly: `
Telechron; with hands ; less T-l , 2 240485553 IF and diode transformer :
line cord .................. 10 .25 455 Kc; complete ........ . . .95
exch 7 .70 'r-3 253478121 Output transformer ...... . . . 1 .05
1 Coi ls Part Lint
V" Number Description Price
L-1 24K6l0788 Antenna Loop Rn Panel Assembly l . l0*
L-2 24A475129 Oscillator c0i1 .....-.. . uuu. .90 CHASSIS PARTS - MECHANICAL
speaker 7A478ll8 Bracket , 100p mtg . . . . . . . . .05
"i 7A77337 Bracket , tuning shaft ....... . . . . . . .05
-|__5_1 50K610553 or 4125485548 Clip, IF trans mtg.............doz .20
5gC600g17 or 518484268 Grommet, speaker mtg: rubber. . .doz .20
505500357 or 14A4781l9 Insulator , loop brkt mtg; fi-
503510052 or 2S7051 Nut , hex palnutz 3/B-32 x 9/16
50K610557 Speaker: 4" PM; 3.2 ohm VC.. 3.90* (volume C?nt"?1 mtg).-........doZ .15
ex?h 2 _g5 35A601669 Pad, cushion: sponge rubber (spkr
(C)John F. Rider

Page 5:

MOT RO A PAGE 23-71
MODELS 5_2C1, 52C1A]
Part Lf"
Number Dunripeian Prwe
CLOCK PARTS
6413610782 Plate, radio dial background:
silver ??1?r'"""""""""" '55 Note: The following llotorola parts are for
52A610809 Pointer, radio dial: light green.. .25 -*- use with Telechron clock movement
.1A610808 Shaft, tuning: with pu11ey........ -.15 Part Nm 59D6m825_
41A1399e Spring, tension (electrolytic mg) .os MK610826 Alam may silver color 40
41573619 SP""3>> *?"s'?" (g'"g """'? 4zA47os32 Clamp, line :10
cox-d)..;.'.....................doz .40 30K4.,B137 Cord' une: with plug; 6 ft long" .55
4570015 ""i*";'>> C ('""i"? sm" er/C so e4x>r..... .40
CABINET PARTS aexsolooz Knob, time .25
59K6l0568 Motor, clock (rotor assembly only) 3.40
lX61DB24 Cabinet, table model: walnut;
less overlays and clock and
radiosca1es.............. .... 4.75* PRICES SUBJECT T0 CHANGE w|1-Hou-|-
28A600064 Connector, wire (connects clock N 0 T I C E
8: radio power leads)........... .05
14B61l36B Insulator, clock: fibre (over *Plus Federal Excise Tax At Current Rate
back of c1o<:k)............... .15
36B6l0B17 Knob, clock control: black ...... .20
1368610815 Knob, radio control: black..-uf- .20
13A610802 Overlay, clock background: gold
l3A610804 Overlay, radio background: gold
34K61Q822 Scale, clock dial: plastic... . 1.45
34C610791 Scale, radio dial: p1l5tic..-- ?>> 1.50
ALARM SWEEP ALARM
DIAL SCALE SECON HAND TIME HAND
cnnnmu. INFORMATION W ...nf ~ ~ ,,, ,,
Model szcm is the same as Mmm szcx except for W ,
styling. A complete listing of 5ZC1A cabinet paris is given ;\ _ ,_, ...fe jj';'""""? . I >> -?
Referee Haw; servinemnnnnxfnrservineanmnnnnns, Z" ,//,"f~= ig >> _
chassis replacement pans, and nxonk replacement pam. Peggy; % ,ug ,Jghj V I - _ _g
.k . ,C, VOLUME
nnmo OFF-ON seoremz ser ALARM ??"TR?L
Aurouumc mos coN1'Ro|_ mos
PARTS LIST SUPPLEMENT
NOTE: When ordering parts, Specify model and chassis number of set in addition to part number and description of
para. The following pn.-ts are revisions of or naamnns to the nn-igannm items uma in the Hs~3o9 se.-vane Manual.
Part Lb*
Numb.. Dem-ip?i?n Price
CABINET PARTS 36K621520 Knob, clock control (black) .... .20
13A792195 lledalllon, on speaker grille .... .55
lV622095 Cabinet, table model: walnut; with 131321392 Qve,-hy, ?1??k bg_?kg;-oundg 'nh
medallivn; less vverlevs ~-~~-~--- 5~55' numbers.. ........................ .95
6lK621891 Crystal, plastic (clock face cover) .85 13?521527 overlay, radio background: with
,6lK621529 Crysflly Plastic (radio face cover) .85 numbers. ........................_ .95
64K6Z1523 Dial background ................... .45 43g500095 31|-,gy/5, pgpgr (on pointy-
59l(62l787 Electric Clock Assembly: Telachron; ghgf?) __,______________,____ per/? _50
With hands; 1955 line ??l'd ~-~-~~~ 1035 25490840 Bpeednut, medallion mtg ........ doz .15
PRICES SUBJECT T0 CHANGE WITHOUT NOTICE
'Plus Federal Excise Tax At Current Rate
(C)John F. Rider

Page 6:

PAGE 23-72 MOTOR0-LA----_
MODELS 52C1>> 52C1A>
| _.I mom ~>
W SIS wG;?;?*' ~
0
(C) John F- Rider

Please note: we carry a wide range of products which will fulfill the specifications above. Please use our search function or browse our products to find what you need!