Motorola 52C7 Schematic

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Product Information:
Model:52C7
Manufacturer:Motorola (Galvin)
Description:HS-310

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:

GENERAL INFORMATION
TYPE -Ac table model suoerheterodyne with appliance
outlet and self-contained electric clock for con-
trolling automatically the operation of the radio
and the outlet.
RECEIVER MODELS Model Color
szco Walnut
szcv Ivory
szcs Green
TUNING RANGE - 535 to I6Z0 Kc IF - 455 Kc
TUBE COMPLEMENT - Type Function
mms Converter
IZBD6 IF Amplifier
IZAT6 Det. AVC It AF Amp
socs Power Amplifier
2-swl Rectifier
POWER SUPPLY - Operates from Il7 volts, 60 cycle, al-
ternating current only. Power consump-
MODELS 5'2C5, 52C7,A
ALARM SVIEEP ALARM
TIME HAND SECOND NAND DIAL SCALE
??-1-tx _ saith
df* fllf ' *1 11- . ;; his ~ s
two; ." 3 2 t tag - '~'?" ssl
>>r er ru row
tome
' Sill
RADIO off-are can mls sal mann votuu: CONTROL ruulus
AUTOMATE KNOB CONTROL KNOB
CLOCK - Telechron sell-starting electric clock, with
Motorola lace and hands.
APPLIANCE OUTLET - For use with 117 volt AC appli-
ance; only, rated at 1100 watts
OPERATING INSTRUOTIOIIS
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-
side antenna in most locations. When receiving a weak sta-
tion, rotate the receiver slightly for best signal strength.
If additional oiok-up is necessary, connect an external an-
tenna to the radio by iollowing the instructions printrd on
the rear panel. CAUTION: Never connect the radio chas-
sis to a water pipe, radiator, or other ground.
CLOCK OPERATION
The eloelf. 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 n etoelrwise direction only.
ALARM OPERATION
To set the alarro, pull out knob '-c" and rotate it ina
counterclockwise direction to the desired tirne on the alarm
dial scale. The alarm will ring for one hour, or until knob
Hs" is pushed in. The alarm function is completely inde-
pendent ol the other controls on the clock.
APPLIANC E OUTLET
To control an electrical appliance autornstioally, plug it
into the receptacle on the bask of the radio. see Figure 1,
xt will then be turned on or off simultaneously with the radio,
CAUTION: Note that the rating of the outlet is II00 watts
If radio reception is not desired when oPeratin5 tins ap-
plianee, rotate the radio yolurne control to the minimum vol-
(C)John F. Rider

Page 2:

PA E 23-18 MOTOROLA
MODELS 52C6, 52C7,A,
@ - set wr
FIGURE 1. REAR VIEW
BEDTIME CONTROL
The lasnrlivils control will turn the radio and appliance
off after any pre-set interval of time up to one hour.
Turn knob "A" to the "OFF" position and rotate knob "B"
to any period cf time between 0 and 60 minutes. The radio
and appliance will be turned off automatically after the prop-
er time has elapsed, and they will remain off until turned
` on again manually.
AUTOMATIC RADIO OPERATION
The clock controls may be pre-set to turn the radio on
automatically at any time up to twelve hours in advanse.
If an appliance is plugged into the receptacle on the hack
of the receiver, it will be turned on automatically, along
with the radio.
Pull out knob "C", rotate it Counterclockwise to the de-
sired time on the alarm dial scale, and push the knob back
in. Rotate knob "A" first to the "OFF" and then to the
"AUTO" position. At the pre-set time, the radio will come
on and will continue to play until turned off manually. The
alarm will ring also if the knob "C" is left pulled out. The
radio will come on first and, after an interval of about ten
minutes, the alarm will ring.
BEDTIME AND AUTOMATIC OPERATIONS COMBINED
By combining the operations in the two sections above,
the radio may be turned off automatically and on again auto-
When setting the BEDTIME Control, rotate knob "A" to
the "AUTO" position instead of "OFF". IMPORTANT: It ii
necessary to turn knob "A" first to the "OFF" position be-
fore proceeding to "AUTO", otherwise the radio may not
shut off.
' NOTE: It is recommended that an isolation transformer be
placed between the power line and the receiver to avoid hum
and electrical shocks. If an isolation transformer is not
1 available, connect the low side of the signal generator to B-
, through a . l mf capacitor.
I. Connect a low range output meter across the speaker
voice coil.
z. Connect the low side of the signal generator to B-.
3. Set the signal generator for loo cycle, 30% modulation.
4. Turn the receiver volume control to maximum.
5. Use a small fibre screwdriver for aligning the IF and
diode transformers. '
6. As stages are brought into alignment, reduoe the signal
generator output to a level which produces less than .40
volts (_ 05 watt) aoross the voice Eoil to avoid overloading
the receiver. '
7. See Figure 2 for adjustment locations and the following
chart for prooedure.
2 ALIGNMENT CHART
t DUMMY GENERATOR GENERATOR' GANG
STEP ANTENNA CONNECTION SETTING ADJUST REMARKS
IF ALIGNMENT
RF ALIGNMENT
Grid of conv. 455 Kc
? 3. .1 mf Grid of conv. 1620 Kc
, 4. Radiation loop* 1400 Kc
E *Connect generator
Fully
open
Fully
Fully
open
Tune for
max
FREQUENCY
Adjust for maximum.
set pointer to hori-
Adjust for maximum
Adjust for maximum
output across 5" diameter, 5 turn loop and couple induetively to receiver loop. Keep loops at least
(C)John F. Rider

Page 3:

MOTOROLA PAGE 23-19
MODELS 52C6, 52C7,A,
ssc (TOP) sec (Toe)
FIGURE 2. TUBE AND TRIMMER LOCATION
SERVICE NOTES
TO REMOVE RADIO CHASSIS FROM CABINET
l. Pull of( 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 the two hex head
screws at the rear edge of the radio chassis.
4. Slide the radio chassis and loop from the cabinet.
5. Disconnect the power leads to the radio enaaara and to
the appliance reoeptaele.
T0 REMOVE CLOCK FROM CABINET
1. Remove the radio chassis as above.
A Z. Pull of( the three Clock control knobs.
2 3. From the back of the Cabinet, remove the three hex head
? screws wmon new the clock and are fibre ananiamr.
T 4. Carefully remove me clock, to pTevent damage to its
T hands or faoe.
1 TC REPLACE CLOCK DIAL BACKGROUND Y
1 1. Remove me clock from the Cabinet as above.
l z. Carefully pun off the three hands.
3. Remove the alarm diax and dial background.
DIAL *BACKGROUND
PLATE
/\/- POINTER
/NQTQ WITH GANG FULLY
GANF\ CLOSED SET POINTER TO
FULLY CLOSED HOWZONTAL POSIUON.
DRIVE CORD
TURNS
FIGURE 3. STRING DRIVE DETAIL
4. Install new background.
5. Tarn :ne radio Centrex Shan to "AUTO" position-
6. Slowly rotate the time set shaft clockwise until the
switch contacts behind the radio control shaft close.
7. Reassemble the alarm dial and three hands, Set all the
hands to indicate IZ o'c`lock. Set the figure "IZ" on the
alarm dial to index with the small pointer on the hour hand.
B. Check the automatic operation to be sure the switch con-
tacts close at the time indicated on the alarm dial..
(C)John F. Rider

Page 4:

PA E 23-20 MOTOROLA
MODELS '52C6, 52C7,A,
PWR AMP 'J
APPLIANCE 'ZBEG
OUTLET CONV
DET IF AMP
FIGURE 4. PARTS LOCATION
(C)John F.. Rider

Page 5:

MoToRoLA PAGE 23-21
> > L: out
Lung ' \ O
0
" "J ~?# ole o
(C) John F. Rider

Page 6:

PAGE 23-22 MOTOROLA
MODELS szce, szcv, A,
PARTS LIST
Nora When order-.ng parts epeerfy model and chassxs numbers of se? xn
Ref Part
Number neserxpnren
CHASSIS PARTS ELECTRICAL
List
Price
l9B6l082O Varlable 2 gang wlth
pulley
SRSSZI Paper 05 mf 200V
SR490232 Molded paper 47,000 mmf 400V
21B4B2847 Ceramxc, multiple 2000 220
SR9302 Paper 02 mf 400V
238600855 Electrolytic 50 30 mf/150V 1
59K5l0535 Electtlc Clock Assembly
Telechron wxth hands
less lxne eera
Choke capsertor
SA690487 Choke and 15 mf paper
lX610854 Antenna Loop, Panel, and 95*
Receptacle Assembly comp
248680364 Oscillator coll
Speaker
50K610557 Speaker 4' PM 3 2 ohm VC 90*
Note All reslstors are lnsulareu carbon type
unless otherwxse specxfmed
2 2 meg 20% 1/ZW
l0 neg 20% 1/2w
Transformers
doz
doz
doz
Volume control l meg
doz
doz
doz
doz
doz
1000 20% 1W each
IF and dlode transformer
455 Kc, complete with
capacxtors, cores
shield
, and
Part
25K680345 Output transformer
Number Descrlptlon
CHASSIS PARTS MECHANICAL
Bracket, 1oop mtg
Bracket , v.un1ng shaft
Clxp, IP trans mtg
doz
List
Part
Number
addxnon to part number and descrxptwn of part
Grommet, speaker mtg rubber doz
Insulator, loop brkt mtg fibre doz
Nur, hex ps1nur 2/s 32 x 9/16 vol
ume control mtg) doz
Psa, eushron sponge rubber (spkr
Plate, radxo d1al background
Silver color
Poxnter, radxo dzal lxght green
Receptacle, applxance (on loop
shaft, run1ng wlth pulley
Socket, tube mxnxature, 7 pron
w1th dummy lug and center shleld
wafer type
C" (tun1ng shaft mtg)per/c
shoulder fxbre (loop
bracket ncg) doz
Washer
CABINET PARTS
Cabxnet, table model walnut,
less overlays and clock and
radlo scales (5206) 75*
cuhruet, table model 1vory
less overlays and clock and radxo
Scales (52C7) 30x
cehruer, table model green, less
overlays and clock and radio
scales (5208) 30*
Connector, wxre (connects clock &
Insulator, clock fibre (Over back
Knob, clock control black
Knob, radlo control black
Overlay, clock background gold
color
Overlay, radxo background gold
color
Scale radxo d1u1 plesrxu
CLUCK PARTS
Note The iollowlng Motorola parts are for use
with Telechron clock movement Part
Alarm dlal sllver color
Clamp, l1ne cord
cord, 11ne w1?n plug, 6 fr long
D151 background sxlver color
Hand hour lumlnous
nano, seeona black
Knob, time set
Motor, clock (rotor assembly only)
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
*Plus Federal Exclse Tax At Current Rate
radio power 1eads).. ..... . ....... .05
?Jolm F. Rider

Page 7:

MOTOROLA PAG 23-
MODELS 52C6, 52C7, A,
SUPPLEMENT NO.
This manual contains a supplementary Replacement Parts SPEAKER
Last mv"-ang p.-?a\m?x?n revisions in the szce series or re-
ceivers. Four alternate speakers have been added. All speakers are
listed below.
OUTPUT TRANSFORMER DIAL BACKGROUND
An alternate output transformer. interchangeable vi/ith the ln later production Model 52C'l receivers, the dial back-
original, has been added. Both transformers are listed be- ground color was changed from gold to xilver. The color
low. remains gold for Models 52C6 and SZC8. `
PARTS LIST SUPPLEMENT
NOTE: When ordering park, npeeify modal number of ne in addition en part number and dum-ipiidn of perk.
Pnr! List Part Lint
Number Dencriplion Price Number Description Price
25K6B0345 or l3K62020l Overlay, clock background: silver
25B478l21 Output Transformer . . . . . . . . . . . . . ., . 1.05 color (5207) (replaces l3K6l0803
50K61055B or on lute model 5267) .............. .20
50K610557 or l3K620200 Overlay, radio background: silver
50C6000l7 or color (52C7) (replaces 13A6l0804
508610052 or on late model 52C7) . . . . . . . . . . . . . . .20
50C610506 Speaker: 4" PM; 3.2 Ohm VC. . . . . . . . 3.9ox
PRICES SUBJECT T0 CHANGE WITHOUT NOTICE
'Plus Federal Excise Tax At Current Rate
SUPPLEMENT NO.
PARTS LIST SUPPLEMENT
NOTE: when ordering pm-ts, specify model number of an in aaanion to part number and aeurxption of put.
The follow ing parts ure revisions ot or additions to the original item. Jing] in nm 145.310 Sgyvieg Menual.
GENERAL INPORMATIUN
Model 5ZC7A is the same as Model 52C7 except for
styling. A complete listing of 5z<:7A cabinet peru is given
Refer to HS-310 Service Manual for service instructions.
chnssis replacement pam, and clock replacement pam.
N,,,,,|,,,. Deeeription Price
CABINET PARTS
lV62l72l Cabinet , table model; ivory; with
medallion; less overlays and
clock I radio crystals. . . . . . . . . . . 6.30*
61C62l528 Crystal , plastic (clock face cover) l.45 0
6lK62l529 Crystal , plastic (radio face cover) .85
saxeziszo Knob, clock euntroi (black) . ...... .20
iaxezisss over-ny, einer nickname; silver SET ~-~ -~-~# C?NTR?\-
l8C62l668 Overlly, rldio background: silver
25490840 Speednut: for l/16" ltud

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