Motorola 52M1U Schematic

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Product Information:
Model:52M1U
Manufacturer:Motorola (Galvin)
Description:HS-300

Schematics Content:

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Page 1:

GENERAL INFORMATION
TYPE - Three-power (Ac/DC. Battery) portable radio re-
ceiver. Four miniature type tubes and a selenium
rectifier are used in a superheterodyne circuit.
RECEIVER MODELS Model Color
52MlU Green
SZMZU Maroon
5ZM3U Gray
TUNING RANGE - 535 to 1620 Kc lF - 455 Kc
POWER SUPPLY -
Operates from 117V AC/Dc (15 watts)
or from the following batteries:
2-i-1/z you flashlight eeus
or Burgess Z
or any equivalent size "D" flash-
light een.
1-67-l/Z you "B" battery
or Burgess XX45
OPERATING
TO OPEN FRONT COVER. The front cover is opened by
pushing up on the cover release button, located in the cen-
ter of the front cover. The receiver is automatically turned
on whdn the fr-one enver is opened and raised to a vertical
TO OPEN BACK COVER. The back cover is opened by
grasping it at the top and gently pulling cover open. When
closing the cover, be careful not to pinch the power line
cord or other leads between the cover and the cabinet.
HOUSE CURRENT OPERATION. The power cord is located
inside the cabinet and can be reached by opening the back
cover. Pass the line cord through the slot on the side of the
receiver before closing the cover. Plug the power cord into
any ll7 volt AC or DC power outlet. Reverse the line cord
plug in power outlet if the receiver does not operate from
DC power. When operating from AC power, reception may
sometimes be improved by reversing the power plug in
power outlet. It is not necessary that batteries be installed
if the receiver is to be operated only from house power
BATTERY OPERATl0N. Open the back cover and install
batteries by following the instructions found on label located
on back cover or as shown in Figure Z. Plug the power line
pcord into the receptacle on the receiver chassis, as shown
bn label, or the receiver will not play from batteries. If
the receiver is td be operated for a long period of time
from AC or DC house power lines, or is to be placed in
storage, remove the batteries and store them in acool
MODELS 5`2M1U, 5'2M2U,
TUBE coMPu:Mz-:NT - Type Function
lR5 Converter
lU4 IF Amplifier
IU5 Det, AVC lx lst AF Amp
354 Power Amplifier
Selenium type -for
AC/DC operation
Rectifier
INSTRUCTIONS
IMPORTANT: Never leave low or run-down batteries in
your receiver because they will leak or swell and damage
your receiver.
TUNING CONTROL.. Stations are tuned in with the right-
hand knob. Tune carefully until you are exactly on a eta-
tion; tuning to either side of it will result in poor tone qual-
ity and exeeeerye noise. Do not regulate volume by detuning
the station; always tune exactly onthe station, then adjust
volume control to desired loudness.
VOLUME CONTROL.. The left-hand knob controls volume.
Rotation to the right will increase volume; rotation to the
left will decrease it.
T0 TURN OFF. Closing the front cover will automatically
turn off the receiver.
ANTENNA. A super-sensitive "Aerovane" loop antenna is
built into the front cover of this receiver. Because of the
slightly directional characteristics of the loop antenna. re-
ception from some stations may be improved by rotating the
receiver. ln extremely noisy locations, rotate the receiver
until minimum noise and maximum signal pick-up is ob-
BATTERY REPLACEMENT. If low volume or fuzzy tone
is noticed when operating from batteries. replace the flash-
light cells. Normally, the 67-I/2 volt "B" battery will last
for 3 or 4 changes of the flashlight cells.
NOTE: The condition of the batteries will not affect opera-
tion ot receiver from 117 volts AC or DC. Complete bat-
tery replacement instructions will be found inside the re-
ceiver back cover.
(C) John F. Rider

Page 2:

E 23-2 Moron _
MODELS 521s/nu, 52M2U,
SERVICE NOTES
The chassis of this receiver _is isolated from the AC
power line circuit by a capacitor-choke assembly to elimi-
nate the shock hazard when handling the receiver, How-
ever, as an additional precaution when aligning or servicing
the receiver from AC, an isolation transformer should be
inserted between the power line and the chassis.
The tubes are exposed when the rear cover is opened.
'xr is not necessary to remove the chassis to replace tubes.
TO REMOVE THE CHASSIS FROM THE CABINET:
1. Open the rear cover and remove the batteries.
Z. Remove the two hex head screws that mount the chassis
to the cabinet-
3. Slide the chassis from the cabinet.
4. Disconnect the two loop antenna leads from the hinges.
ALIGNMENT \/
NOTE: The receiver may be operated either from batteries
or from 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. If an isolation transformer is not available, connect
the low side' of the signal generator to B- through a .l mf
1. Connect a low range output meter across the speaker
4. Turn the receiver volume control to maximum.
5. Use a small fibre screwdriver for aligning the lF and
diode transformers.
6. Adjust the signal generator output to produce .40 volts
(.05 watts) across the voice coil. As stages are aligned,
to avoid overloading the receiver, reduce the generator
voice coil. '
Z. Connect the low side of the signal generator to B--
3. Set the signal generator for 400 cycle. 30% modulation.
output to maintain the . 40 volt level.
7. *See Figure 1 for adjusting locations and the following
chart for procedure.
ALIGNMENT CHART I
DUMMY GENERATOR GENERATOR GANG
STEP ANTENNA CONNECTION FREQUENCY SETTING ADJUST REMARKS
1. . l mi Grid of conv 455 Kc Fully 1, Z & 3 Adjust for rnaximum. I
(pin 6, lR5) open (IF cores)
RE ALIGNMENT
Z. . l mf Grid of Conv 1620 Kc Fully 4 (OSC) Adjust for maximum.
(pin 6, lR5) open |
3. - Install chassis in cabinet.
leaving output meter con~
4? mutation 1400 Kc Tune fm- 5 (Ant) Adjust for maximum. Trim-
loop* max mer is reached through hole
under plug button on side of
*Connect generator output across 5" diameter, 5 turn loop and couple inductively to receiver loop.
Keep loops at least IZ" sPart.
@ John F. Rider

Page 3:

MODELS 51ZM1U, 52M2UJ
-' =' EEE LOOP
'Em #MP | ??; I9 D 9 meow
FIGURE 1, TUBE AND TRIIDIER LOCATIONS
CHASSIS
MTG Y EW---
"A" BATTERIES
"a" BATTERY ->>
--CHASSIS MTG SCREW
\-SLOT Fon LINE ooRo
\FOR BATTERY OPERATION
PLUG UNE CORD INTO 1
REGEPTAOLE ON CHASSIS
______CO|L LINE CORD HERE
WHEN NOT VN USE I
FIGURE 2. REAR VIEW OF RECEIVER
(C) John F. Rider

Page 4:

PA E 23-4 MOTOR L
MODELS 52M1U, 52M2U,
I F MP DET AMP F
STRIP
PWR AMP
l-??P PWR AMP
LEAD
LN NEG
FIGURE 3. PARTS LOCATIONS
LOOP
LEAD
?J'ohn F. Rider

Page 5:

Ill
CAPACITOR
CERAMIC
TIC
(C) John F. Rider

Page 6:

PAGE 23-6 M_OTOROLA
asm . use 15 Q 50| 5 ~ ; f 30, ' My -uv 5 _
m was 1 4 e. I ,0",,fE5 v I ' : . W ," - |
l(- I I gig '
ww ,' mow en/
I -l0V MEG
NOTE _ ?oL2v?A%onsu
CAPBCITOVS IND CAYED IN MMF UNLESS DAGJAG S! Zn In 0
ALL REURSI5YOPS INDICAIED IN ONNS, F' "I RB '
VULIAGE NERSUREMENIS MADE WITH ' 3
4 unsungwinr man: wme GANG "V ,M sw $55 26 5./v E2 , im
ru\.\.v nr# N. a \ E ,_ |25 one ~ 5 au , \ vu
UPPER vounac Runniss onvA|N:o on ' \ D "" "?'?? 9" ' ' 'HQYI
g?ggmg gzsi?mou Arm Lowzn 5, ? , 5\ \ , , ? , " , "' "' |\ I ,;'
(C) John F. Rider
M OF CHASSIS USING MULTIPLE CERAMIC CAPACITOR-RESISTOR P
EMA
SCH

Page 7:

MOTOROLA PAGE 23 7
MODELS 52M1U, 52M2U
NOTE: When ordering parts, specify model and chassis numbers o(_set in addition to part number and description of part.
Ref . Part List Ref . Part 1.1812
No. Number Description Price No. Number ` Description Price
cmssxs mms _ ELECTRICAL SEBHKBF
Capacitors LS-1 50K600141
C-2 2110181377 Ceramic: 500 mmf 500V....... .20 ohm VC.................?>>.. 3.75*
150V/250 mf 10V ....... ..... 1 .75 Resistors
C-5 21K482725 Ceramic, disc type: 10,000
mmf 450V. ............ . . . . . .30 Note: All resistors are insulated, carbon type
C-6 2lK77373 Ceramic: 47 mmf 500V. . . ..... .20 unless otherwise specified.
C-8 Z1K482726 Ceramic, disc type: 10,000 li-1 6112122 4.7 neg 20$ 1/ZW. . . . . . .dbz 1.20
C-9 211377286 Ceramic: 100 mmf 100V. L . . . . . .20 11-3 l7K692009 Wire wound: 2150 5% 101;
C-11 2111115312 Ceramic , disc type: 5000 R-4 6116397 22,000 1.0? 1/27. . . . .... do: 1.20
C-12 BK71213 Paper: .05 mf 100V ..... . . . . .20 H-6 6112109 10 meg 20$ 1/ZW ..... . . .d0Z 1.20
C-13 21K4B2726 Ceramic , disc type: 10 ,000 B-7 6116269 B20 1.0% 1/2l. . . . . . . . . . .doz 1.20
C-14 2lK691992 Ceramic , multiple: 2000 mmf, R-9 6R211B 3.3 meg 20% 1/2l. . . . . . .dbl 1.20
11-11 6112109 10 meg 201. l/2I........doz 1.20
B-16 6112122 4.7 meg 20% 1/2l ...... .doz 1.20
Choke Capacitor R-17 6116004 1 meg 20% 1/2l. ...... . . .doz 1.20
s Choke s. .os mf zoov paper a-1s anzus 3.3 meg 201. 1/21| ..... . .nee 1.20
capacitor ........ . ...... ... .40
Switches
Rectlfier S-1 403471927 Hotlry Switch, 5 PDT (AC/DC-
E-l 485791092 Selenium Rectifier: half- Battery selector) . . . . . . . . . . 1.15
wave ................ . ...... 1.40 S-2 40K501702 Slide Switch (On-off) . . . . . . . .50
Coils Transformers
L-1 lX6l0665 Antenna Loop Ez Front Cover 1'-l 24K600824 IF Transformer , 455 Kc:
Assembly: complete; green ' complete with capacitors." 1.05
plastic (521|1U). ............ 5.25* T-2 24K80OB25 Diode Traneforner, 455 Kc:
lX6l0666 Antenna Loop, Panel & Hinge complete with capacltorn.. 1.05
ASSemb1y: less front cover; T-3 25K692006 Output Transformer. . . . . . . . . , .95
green plastic (52llU) .. .... 2.90*
24K601803 Antenna 1..00p ls Panel Assem-
bly: less hinges; green
plastic (52l1U) . ........... 1.40*
111610682 Antenna L00p 8| Front Cover Plff 141312
Assembly: complete; maroon Number DescriP?5?D Pf1?9
plastic (52l2U) .... . ....... 5.25*
' lX6106B3 Antenna Loop, Panel a Hinge CHASSIS PARTS - IBCHANICAL
Assembly: less front cover; _
maroon plastic (521120) ..... 2 ,90=u 43A6920ll Bushing, insulator: fibre (chas-
24.B60l802 Antenna Loop & Panel Assem- sis mtg screw insulators) .....doz .40
bly: less hinges; maroon 43A6920l2 Bushing, line cord strain relief
plastic (521120) ........ .... l.40* (USB with 43KG92013).... .... .>>... .05
1X6ll24l Antenna Loop 8: Front Cover 42K75826 Clip, electrolytic mtg. . . . . . . . .don .40
Assembly: complete; gray 42A4B5548 Clip, IF transformer mtg .... . . .don .20
plastic isznav) . . .. . . . ..... 5-.z5>> 3oKso1111 corn, une; with plug; 6 ft long. . .90
1X611253 Antenna Loop, Panel 8: Hinge 29123020 Lug, oldering: battery contact
Assembly: less front cover; (in "A" buffers' retainer) . . . . .doz .ao
gray plastic (szusu) . . . .... 2_9o=o< BA470980 neeeprnele , xeep (on loop leadsloz .25
24K6Z0032 Antenna Luop s. Panel Assembly: 158481896 nernxner , "A" better-y_= plnetxc .... .15
less hinges; gray plastic 43K6920l3 Retainer, strain relief bushing '
(52M3U).... .......... ...... 1.40* (nn 1xne nerd nnenxns)... .... .... .05
L-2 24K610513 0Sc111at0r C011 (yel101I code) .35 268692001 Shield, back (on rear of chlSB1S) . .15
?.Tohn F. Rider

Page 8:

P ' E 23- MOTOROLA
MODELS 52M1U, 52M2U,
part List Part List *J
Number Description Price Number Description Price
26A69zoo5 'Shield heat (around R-3).......doz .30 557770 Rivet; .088 x 5/32; stl; nkl pl
268691996 Shield, switch (over AC/DC-Battery (hinge insulator mtg).. .... .Per/c .50
9A690lZ9 Socket, tube: miniature; 7-prong.. .15 (front hinge mtg). .... . ..... per/C .50,
4lK680029 Spring, battery contact (in "A" 3S8l44 Screw, self-capping; 92 x 3/ls; `
battery retainer).............doz .20 Phillips flat head; ant enp
3110170380 Strip, "B" battery terminal: with (mounts loop to front cover)
3lK37504 Strip, terminal: l insulated lug, 35400356 Screw, sheet metal: #4 x 1/4
#1 mtg....... .... ....... ....... .. .05 hex head (chassis mtg)......per/c .50
3lK470746 strip, terminal; 3 insulated lugs, 382995 Screw, machine; 5-40 x 5/16 pl hex |
#2 mtg ...... ..... . ............. ._ .05 head (handle mtg)..........per/c .50
4K41os39 Washer, fibre (R-3 ntg).. .... per/c .50 41A470909 Spring, door latch (inside front ,
4lK692l67 Spring, handle (inside plastic
257981 Speednut: for l/8" stud (grille
Monet sznlu CABINET PARTS mtg) ..... ........ ...... .......dnz .15
41K601712 Spring, rear nnver 1atch....>>~.doz .35
46A601807 Stud, front hinge mtg Us loop con-
355511249 Bafflef 5Peaker: cardboard ..... ... .05 nectors.... ..... .-... .... ......J. .05
383601741 Button, cover release (on front 455601725 5t"d>> 1lf?b Fetliher (front cover
asxsezoso Button, plug; green finish (loop 46K59??79 Stud. tf1l?""t? blk nkl (on loop
trlnner aa; hole ?over).......... .10 Panel ~f?r Oneritinx On-011
lX6l0664 Cabinet: complete; less handle, switch) . . . . . . . . . ..... . . .... . . . . . _ .25
grille and antenna loop and tront
cover assembly; green.... .... .... 7.55*
55A69205B' Cover, handle mtg (over ends of
55A37ll3 Foot, cahxnet bottom: felt. .... do! .60 |gDgL 52|2U CABINET pAR15 _ gil, as "??e} 5g|1u except.
lX6l0667 Front Cover Assembly: complete;
less 1??v; green v1aSt1?--~..--.- 1-90 3SK600106 Button, plug: laroon finish (loop
lX510668 Grille Assembly: complete with trimmer adj hole cover)..,,,,,._, ,10
letsh retainer Stud. "pper u lxslossl cnhxnez; complete, less handle,
1?WEURr Sveakef Bfi11EURS~-~-~-->>---- 2-20 grille and antenna loop and front
l3A6l0656 Grille, speaker (upper) ....... .... .10 ??ve, -Sse-bxy; _nroon_ _____ _..._ 7_55,
139510557 Grille: 5P?3?ef (1?'e')>>-~-~~~~>>~- >>2? 1X6l06B4 Front Cover Assembly: complete,
55K692166 Handle. Cvrryinsr sfeen Dlastie; less loop; maroon p1nsr1c........ 1.90
less spring........ .......... .... .20 55K600l07 Handle, carrying: maroon plastic;
550501755 HiDEe, ff?"? C?V?f= C?"P1?t9; less spring. ...... ... .... ........ .20
55K60l757 Hinge, front cover: complete; bronze (front cover hinge mtg)
55K30198 Hinge, rear cover... ....... ....doz .25 463630035 stud, tri-aunt: Statuary bronze
l4A60l753 Insulator, cap: plastic (on grille (on loop Plnel _for operating
assembly luEs)....-.............. .05 on_?1f s'1tch) ____ ____________d?z _25
36C60l724 Knob, control (tuning).....>>...... .55
36K60l725 Knob, control (volume).....-...... .55
lX60l765 Latch and place Assembly (inside p
front cover)....... ...... .......~ .30 f
4S'l595 Lockwasher , intl #5 (handle ltg)/ UDDBL 52l3U CABINET PARTS - Same as lodel 52l1U except tl
2985399 Lug, soldering (under front hinge, 38K6ll1l6 Button, plug: gray finish (loop
for loop ennneetxon3........per/c .50 trimmer nd; hole cover) ....... .__ .lo
54C510735 Plate , background (behind con- 1X611l39 Cabinet: cdmplete, less handle , |
trol knobs)........ ...... . .... ... .55 grille and loop antenna and
s4A692lsl . pints, handle mtg (under handle mtg front cover assembly; gray....... 7.55.
covers) , , _ , , , , , , , , .... , .,..... duz .35 1X611254 Front Cover Assembly: complete
5S8487 Rivet: .UBB x 3/32; stl; blk nkl less loop; gray plastic_,,,,,,,_, 1,90
(rear cover hinges E latch spring 55K692l66 Handle, carrying: green plastic;
mtg) ...... ..................Per/c .50 less spring,,.,,,,, ___, ,,,,,_,___ _20
PRXCES SUBJECT TO CHANGE WITHOUT NOTICE
*Plus Federal Excise Tax At Current Rate
Rider

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