Motorola 52L3 Schematic

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Product Information:
Model:52L3
Manufacturer:Motorola (Galvin)
Description:HS-327

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 - Three~power (Ac/nc, Battery) portable radio re-
ceiver. Four miniature type tubes and a selenium
rectifier are used in a superheterodyne circuit.
RECEIVER MODELS Model Color
52Ll Green
5ZI_.Z Maroon
521.3 Gray
TUNING RANGE - 535 to 1620 Kc IF - 455 Kc
POWER SUPPLY - Operates from ll1v Ac/nc (15 watts)
or from the following batteries:
MODELS 52LI, 52L2,
RELEASE BUTTON
FOR BA K COVER
VOLUME p
aim ! , _W eff;
FIGURE 1. FRONT vlew or RECEIVER
TUBE COMPLEMENT - Type Function
mi converter
1114 IF Amplifier
ms Det, Avc nr lst AF Amp
354 Power Amplifier
Rectifier Selenium type -for Ac/Dc
operation
OPERATING INSTRUCTIONS
TO OPEN BACK COVER. Press the release button on the
top of the cabinet end,`with the fingers, poll the back cover
open. When closing the cover, be careful not to pinch the
power line cord or other leads between the cover and the
HOUSE CURRENT OPERATION. The power cord is located
inside the cabinet and can be reached by opening the back
cover. Pass the cord through the slot on the side of the re-
ceiver before closing the cover. Plug the cord into any 117
volt AC or DC power outlet. Reverse the plug in the outlet
if the receiver does not operate from DC power. When op-
erating from AC, reception may sometimes be improved by
reversing the power plug in the outlet, It is not necessary
that batteries be installed if the receiver is to be operated
only from house power lines.
BATTERY OPERATION. Open the back cover and install
the batteries by following the instructions on the label lo-
cated inside the cover, or reier to Figure z. Plug the power
line cord into the receptacle on the chassis, or the receiver
will not operate from batteries. lf the radio is to be oper-
ated for a long period of time from house power lines, or
is to be placed in storage, remove the batteries and keep
them in a cool place. IMPORTANT: Never leave low or
run-down batteries in the receiver, as they will swell or
leak and damage the set.
coNTRol.s. The volume control and power switch are com-
bined and are operated with the vohul/LE knob (see Fig-
ure l). Select stations with the TUNlNG knob. The mark-
ings on the dial scale can he read in kilooycles byadding two
zeros to the figures.
ANTENNA. A Ferrite Magnetic Iron Core Antenna is built
into this receiver. Because of the slightly directional char-
ecteristics of the built-in antenna, reception from some
stations may be improved by rotating the receiver. In ex-
tremely noisy locations, rotate the set until minimum noise
and maximum signal pickup are obtained.
BATTERY REPLACEMENT. Replace the batteries when
low volume or fuzzy tone is noticed, Complete battery re-
placement instructions will be found inside the back cover,
or refer to Figure 2. NOTE: The condition of the batteries
will not affect operation of the receiver from the house
power lines.
SERVICE NOTES
The chassis of this receiver is isolated from the AC
power line circuit by a capacitor to eliminate the shock
hazard when handling the receiver. However, as an addi-
tional precaution when aligning or servicing the receiver
from Ac, an isolation transformer should be inserted be-
tween the power line and the chassis.
The tubes are exposed when the rear cover is opened.
It is not necessary to remove the chassis to replace tubes.
TO REMOVE THE CHASSIS FROM THE CABINET
Refer to Figure Z (or the locations of the items 'men-
l. open the back cover and remove the batteries.
2. Remove the two wire clips which hold the plastic re-
tainer hlocks at each end of the "A" battery compartment.
3. Remove the screw holding the cover stop cord to the
4. Remove the chassis mounting Screws, at the four cor-
ners of the chassis,
5. Slide the chassis, with knobs and escutcheon, from the
6. Remove one of the handle clips. (Squeeze the sides of
the clip until it is released from the escutcheon.)
7. Remove the two screws located under the handle, and
lift on the escutcheon.
B. Pull oii the knobs.
REAR COVER HINGE INSTALLATION
The proper method lor installing a new hinge is shown
in Figure 3. Note that the under side of the cabinet should
rest on an iron block during the heating process to prevent
the tormation of a heat bubble on the bottom of the cabinet.
@John F. Rider

Page 2:

FIGURE 2. REAR VIEW OF RECEIVER
X X APPLY HEAT AT
' rms POINT st-:AUNG
' SPRING mro PLASTIC
FIGURE 3. REAR COVER HINGE INSTALLATION

Page 3:

MODELS 52L1, 52L2,
NOTE: The receiver may be operated eieiier from batteries
or (rom the commercial power lines during alignment. If
AC power is used, it is recommended that an isolation
transformer be placed between the power line and the re-
ceiver. U an isolation transformer is not available. con-
nect the low side oi the signal generator to B- through a . l
l. Connect a low range output meter across the speaker
voice coil.
Z. Connect the low side of the signal generator to B-.
5. Set me signal generator for 400 eyeie, 301. modulation.
4. Turn the receiver volume control to maximum.
5. use a small fibre screwdriver for aligning nie IF and
diode transformers.
6. Adjust the signal generator output to produce .40 volts
(.05 watts) across the voice coil. As stages are aligned.
reduce the generator output to maintain nie .40 volt level,
to avoid overloading the receiver.
7. See Figure 4 for adjusting locations and the following
clialtt for procedure.
/` ALIGNMENT CHART
Dummy GENERATOR GENERATOR GANG
STEP ANTENNA CONNECTION FREQUENCY SETTING ADJUST REMARKS
ur ALIGNMENT
1. .1 ml Ani section of 455 Kc Fully 1, 2 ai 3 Adjust for maximum.
gang (green loop open (IF cores)
RF ALIGNMENT
2. - Attach chassis bottom cover,
3. _ _ _ _ _ Install batteries in chassis.
4. . 1 mr Ant section of 1620 Kc Fully 4 Adjust for maximum.
gang (green loop open (ose trim)
5. Radiation loop* l400 Kc Tune (or 6 Adjust for maximum.
maximum (Ani trim)
5, u Radinicn mop# 600 Kc Tune for 5 Simultaneously tune gang and
maximum (ose eore) adjust eere for maximum
1. wi Radiation loop* 1620 Kc Fully 4 Readjusi lor maximum, if
open (Osc trim) necessary.
s. *ff Radiation loop* 1400 Kc 'rune for 6 Readj"5t '?' maximum. if
maximum (Ant ii-im) necessary.
*Connect generator output across 5" diameter, 5-turn loop and couple iriductively to receiver loop. Keep loops at least iz'-
**Steps 6, 7, ar s need not be performed unless receiver is on calibration or misii-seies badly at low frequencies.
, l I AMP AF
'?25o'2Z" @ 1 ukie sue me 1
nciumz 4. was ai nuinnrn Loca-nous
(C)John F. Rider

Page 4:

PAGE - MOT R LA
MODELS 52L1, 52L2,
T' 5~>>r`1 f . `? *f 1 _` 9 ff ff" V ?q\,J*f "" ` 'PWR AMP
cz C1 L2 R3 IF AMP 05 C12 S1 R14 010 R6 R9 R15 R8 G7 R10
IF AMP
, coumcf Luc - W' BATTERY
a BATTERY c1z L51
TERMINAL STRIP
FIGURE 5. PAR'lS LOCATIONS
(C)John F. Rider

Page 5:

_:_v_LQ1_QRoLA PAGE 23 9
moo
_ ? \ gun 1,
MODELS 52L1, 52L2J
~? may ,
ev; >_ . row
(C) John F. Rider

Page 6:

P E 23-6 MOTOROLA
MODELS 52L1, 52L2, PARTS "ST
Ref. Part ' Lis; _
Nn, Number nereriptien Price pm Lf"
CHASSIS PARTS _ snscrnxcnt \ /
E??EElE??? _ _ 42B485548 c11p, IF trans mtg.............doz 20
C-1 1$B611239 Var1ab1e. 2-gang. . . . . . . . . . . 2.65 42A620l55 CllP_ spring (holds "A" battery) _ _ 05
c-4 z1n4s2126 Ceramic, diss; 10,000 mmf 450v .30 zgkaozb lug solderlng (HA. battery c?n_
c-6 21n4s2126 Ceramic, diss; 10,000 mmf 450v .ao 2s,o5l Nut hex: Palnut, 3/s_32 X 9/ls
C'B 212691992 ?e'""1?- ""1'1P1e' 2???f 1??>> 1vs20112 Retainer, battery; fibre; complete
1??>>_5???_"Ff~------->>~-~-- '55 with brackets; less antenna loop. 1.60
C'9 215701029 ?e'""1?= "1S?' 15?? "mf 5??V '25 43K692013 netnxner, 11ne cord strnxn relief
C-11 811490234 Molded paper: 68,000 mmf 400V .30 ing) ____________________________ 05
250 nf/10V................. 2.70 tary contist lug mtgl__________ 25
_ battery contact spring mCg)..~- . .25
wave, 65 na........ .... - -40 2s11s4n3 Speednut: for 3/8" stud (1nsu1at1ng
C _1 bushing mtg)~....-............d?2 30
_2l_? 41x6a0029 Spring, 'm" battery contact....doz 20
L'1 242611234 A"'?"?" L??P' W'*" ??'?~'~~~ '??* 31A620153 Strip, 'n" battery tern1na1; wxtn
L>>2 248611273 ose111ater ee11....,..... .95 leads _______________________ 30
Speaker
or 50B620039 Speaker: 3}" PM; 3.2 ohm VC. 3.75* C 'NET RT
1V620730 cnnrnet Assenn1y; green; complete
EEELEESEE w1tn grille and back sever (52Ll), 5.s0>>
1 6 zgzzess ?Z fin' se Epecll/Z" d 20 lV52075l Cabinet Assembly: gray; complete
E* 6" 03 1' "eg 10% 2'??'?'?' ?' -2 with grx11e and baek cover (5213) 5 so*
R'2 25 1 ??'?? 02 1/ ?~""-??2 ' U 163611142 Cabinet, front section: green;
n-3 626391 22,000 10% 1/2w........ddz .20 less grllle (52Ll,_ _ l 75
R'4 sR21?9 1? "eg 2?% 1/2'-~~-----'?z '20 1sxs11144 cnh1net, front section; maroon;
n-5 652110 3.3 meg 20% 1/2l......,doz .20 1eee gr111e (52L2) ....... 1 15
11's 1811611379 v?1';':eh??""?1' 1 meg; with 20 1611611146 Cabinet, front section: gray; less
2'8 622122 l?7"?' 22 1/2;'-'-"~d?' -20 42AS11333 c11p, handle (nand1e ntg)......... - 15
R'9 626004 1' "egz 021/2 ??'??~?d?2 l-20 1V611583 cover Aseenhly, esnxnet back; green;
R' R "eg ?% '?"' ?"' ?2 ' complete with lnteh spring and
R-10 6R211B 3.3 neg 20% 1/2w........dez .20 Stop cord (52Ll)__ ____ _ 2 75
"'i; igiziillg 33?? 1?% 1/2'~~?"~?'?"?2 1?2? _ 1V611588 Cover Assembly, ednxnet bnek;
R' maroon; complete with latch spring
or 178620181 Wire wound: tapped; 2150 and stop cord (5212) _ 2 75
n-14 sa6o4o 680 10% 1/2w;..... ....de= 1,20 stop cord (szlal _ 2 75
n-is saggig Egg 10% 1{?;;~-- -~~>>g?Z 1-2? 1ac6115a5 sseuteneon, knob (dn top nr enh1net)1.15
"'16 625683 _ ?2 2' ~'~ ?'~~d?2 ? ? 132611261 6r111e, speaker: 11gnt green (5211) so
R'1Z ZRSSS4 ggo 22% 11/2;"' ""d?2 1?;g 13K620046 Gr111e, speaker: red (5 L2)....... so
R' R ~-- '-?- ?2 ' 13K620047 6r111e, speaker: dark green (52L3) 50
switch 558611236 H?;;_l?,__c;1;_?;ng green, less c ps 55 \_/
s-f"' 400611264 n t 1t n spur

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