Motorola 501 Schematic

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Product Information:
Model:501
Manufacturer:Motorola (Galvin)

Schematics Content:

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Page 1:

PAGE 22-144 MOTOROLA
GENERAL INEORMATIGN
TYPE _ Compact automotive type siiperlieferedyne receiver
wiui self-contained speaker. Receiver is designed
fer installation in any car when used Wien eppi>>e_
priate Motorola control head.
TuNlNG RANGE _ 535 to 1600 Kc IF _ 455 Kc 'f _ _
TUBE COMPLEMENT _ 615116 _ RF Amplifier >> ' ' ""*'"'" ` A ,_/,
seize _ Converter ?4 _e>> _Qt
6BA6 _ IF Amplifier .~ ' ' 'ffrl
6AT6 _ Det, Ave: sr AF Amp
6AQ5 - Power Amplifier 'pf
;gj" 5 FLEXIBLE sn/xFT
ee for ,
POWER INPUT _ s. s amps at 6.3 volts
POWER OUTPUT _ 3.5 watts (mex) _ jf, Q?
- i?~ .* 3) 1 FLEXIBLE sn/APY
~_~>>i>?>>-'?i' " BATTERY
t ANTENNA L
1qgJ5ANE%A_f RECEPTACLE mn |_|enT
REPLACEMENT PARTS LIST
NOTE: When ordering parts, specify model number of set in addition to part number and description of part.
Ref. Part Ref- Part
No. Number Description N?' N"_"'.b_e._'" Desfrlptlon
CHASSIS PARTS _ ELECTRICAL c-ls 81171911 Paper: ,03 mf 40ov
Capacitors c-zo 2311485677 Eleefr-elyriei 15-10-20 mf/350-
c_z amaze Paper: .005 mf loov ...... EE?
mmf; on same bracket as C-5 _
end c-7 1d only as essem_ @1222
mmf; on same bracket as C-3
and C>>7 (sold only as assem-
580 mmf; on same bracket as
C-3 and C-5 (sold only as
RF 8; Antenna Coil (specify
color of paint dots on old
coil when ardering) .......
Oscillator Coil (specify color
. of,paint dots on old coil when
Choke (dial light) ..
Choke, hash ........
C_14 21K7072O Molded: 5 mmf 500vv__ Note: A11 resistors are xnsulated carbon type.
(C)John F. Rider

Page 2:

__ MOTOROLA PAGE 22-145
MODEL E01
Ref. Part Part
\ No. Number Description Number Description
R~2 GR6432 270 10% 1/ZW .. HOUSING PARTS
,R_4 535055 47,000 l/27; ___ 4211472033 Clip, chassis retainer
`R_5 536090 470 1041, 1/QW __ l3B50l659 Cloth, speaker escutcheon .. .....
R-6 GR6287 6800 11| N.I. ........ m, 13D50l358 Esscutcheon, speaker .............. .
R_7 6116004 1 meg 1/Qw ____________ lX50l347` Housing and Bushing Assembly, rear.
l|1,_3 1A472531 volume Control; 500_gg0 ohm=,_ lX50l349 Housing, front; includes escutcheon.
includes Spsm Switch __ 3S7456 Screw, sheet metal: #S x 1/4 PKA
'R-9 5116055 47,000 1/2W ........ Sletted acorn hend; antique Copper
R_]0 635004 1 meg 1/271 finish (housing screws).....
R-12 6R56l4 56 10% 1/2w .. ACCESSORIES
R-13 6112118 3.3 meg l/ZW ..
R_14 6Rg;032 470_000 l/27; __ 65X4l5l Bulb, pilot light: 6-SV; clear
.R-15 6R60l5 220,000 1/2W .. b3Y0HEURf base ~ ~>>~---~--~--.~.... ..
R_l6 5R5336 270 l0% lw 8A449l Capacitor, generator ....,....,.
lR_l7 gllglgq lggg lw N_l_ __ 913473111 Lead Assembly, fuse: complete with
R_lg 5R5577 2709 lgq, l/gy, 9 amp fuse ...................
lX74340 Lead Assembly, dial iight; complete
spark plate with bulb ........................
' Sp_l lX592323 Spark plate Assembly: c0m_ 4S7653 Lockwasher, int-ext: 5/16; stl; cad
4S7657 Lockwasher, ext; mfs; stl; end pl
Transformers (SPEUR1k9l' mtg) ..............
T-1 2413485553 uf, 455 Ko; oompiete with 257003 Nut, hen= #8 X 5/16; Stl; end pl
tuning Q91-es and padding (speaker mtg) .............. '
Capacltors ________________ 252863 Nut, hex: 5/16-18 x 9/16; Stl; cad
'r-2 245485555 Diode, 455 Ko; complete with pl (receiver mtg) ............
tuning Cores and padding 11475148 Shaft, flexible: with housing 24" lg
capacitors ________________ 50K50o415 Speaker, PM: 5-1/4; 3.2 ohm vc .,...
T-3 25B70l7l Output Transformer ..
tl-_4 253472533 Power Transformer __ 3A77542 Stud, receiver mtg .... ..
6X4l4l ' Suppressor, distributor ._
Par; _ TUNER PARTS - MECHANICAL
Number Description
_""?`?"` Note: Electrical parts of the tuner are in-
CHA5515 pA|;T5 _ MECHANICAL cluded in the Electrical Chassis Parts
42A485548 Clip, coil can mtg ........... List-
42Al3177 Clip, center post grounding ....
4254215 C1ip_ vibrator grounding _______ lX59230l Manual Tuner MT-75 ................
457595 Lcckwasnen int: #5; Stl; can pl lX592099 Base, Sleeve, Shields and Channels
(terminal strip mtg) ...,__ , _ Assembly ........................ .
9A47214s Reeeptnmo, antenna .......... , .... 1X78034 Carriage Plate, Slug Insulator and
587771 Rivet: .088 x 3/16 stl; nk1 pl (tube Center Guide Red Aeseuhlv .u-..
socket mtg) _________________ 421170184 Clip, core adjustment , ....... .
537705 Rivet: _l22 X l/3; Stl; nkl pl 46K592080 Core, iron and screw ........
(center post ground clip mtg) 58K780l2 Coupling, manual lead screw ..
557707 Rivet; _l22 X 5/32; Stl; nkl pl 14.470876 Insulator, coil sleeve . .,... .
1 (terminal St,-in and output trans, 14378007 Insulator, slug: bakelite .-....
for-mer mgg) _________________ Y 21477596 Nut, floating: without ear (on
5S770l Rivet: .122 K 3/16; Steel; nk] manual lead Screw) ---~--~~--~--~-
(vibrator grounding Clin mtg) ZA78005 Nut, floating: with our (on manual
_ 3S8l40 Screw, sheet metal: #8 x 3/16 PKZ lead Screw) .,...........,...,... _
plain hex head; nad pl (gnner 64A77593 Plate, tuner front ....,.........
1157454 Screw, sheet metal: #B x l/4 plain (Slug iI1S\l12\t0I` nts) ->>-~~~~-
hex head; stl; cad pl (capacitor 47A78002 Rod, carriage guide ............
bl-ackel assembly and spark Plale 3S7352 Screw, machine: B-32 x 2 slotted,
mtg) _______________________ round head; stl; cad pl (front
353397 Screw, sheet metal: #8 x 5/lG'PKZ plate mtg) ...... ............,
l plain hex head; nad pl (powcr 43A70BBl Sleeve, coil (iron) ..
transformer mtg) ______ _____ 4 1A77595 Spring, coil slug .... .......
91170208 Socket, tube: 4-pin; with grounding 'UA77592 Spring, compression ---.->>---~--
, lug (',ll,,-,tor Socket) ____________ 42A2l577 Washer, "C": spring (manual lead
9K5so218 Socket, tube: miniature; B-prong,.. 'M70873 Wdeher. C011 Spacer ->>
3lC4079 strip, terminal: 1 insulated 1ug, 'M74571 Wneher, fishvnper ----.-.>>..--
end mtg ,_,_,__,_,,,_______ _____ 4 A70956 Washer, slug insulator ......
MA472573 strip, terminal: z ins lugs, #2 W435553 Washer. Spring (manual lead screw
mtg ..........,........,....... mtx) ........,.................
(C)J'ohn F. Rider

Page 3:

PAGE 22-146 MOTOROLA
MODEL 501
ALIGNMENT
Remove receiver fren: and rear housmgs to expose all (1 watt = 1.79 volts en OUYPU( mefer) rhroughour alignment
adjustments. by reducing signal generafer euepuz as stages are brought
mee alignment. use a small fibre serewuriver when a1rgn-
Connect a 6 volt battery to EAT terminal and Chassis. ing IF and diode fransfurmers. A special 1ee1, Me1ere1a
Part Ne. 66A76Z7B, Is requxred fer adjusting me tuner
Connect a low range euzpur meter across speaker veiee ceres. IMPORTANT; De not push rn en The augnmene tool
coil and set volume control ae maxn-num, For grea1es? ae. wnenaejusnng me Tuncrceree; the slightest inward pressure
Acuracy, keep eucpur of recerver at approximately 1 watt may move tunercarrxage and result Ininaccurafe augnmenn.
ALIGNMENT CHART
DUMMY GENERATOR GENERATOR TUNER
STEP ANTENNA CONNECTION FREQUENCY SET TO ADJUST REMARKS
I. .1 mf 6BEb grid(p1n 455 Kc Hrgn frequency end 1, 2, 3 ar 4 Peak [or maximum in
#1) ar chassis (eeres euz) order indicated. Check
by repeating step.
RF ALIGNMENT
z. see Fig. 1 Antenna reeep- 1610 Kc 1~I1g1r frequency end; 5, 6 gr 1 Peak fer maximum rn
tacle naruugk ceres should pro- ereer anexeaeed.
dummy ject 1-1/S11 Trem cans
(screw our if neees-
3. 'I " 1425 Kc 1425 Kc -per E1g, 1 8, 9 sr 10 Peak for makrmum an
4. When receiver is installed rn car, extend antenna fu11y, set rI1a1 to apprex1ma?e1y 1400 Kc and repeak antenna trxmmer (7)
for maximum volume of a weak station or noise bezween seanens.
TRANSFORMER
63235 earner
(R)Pw1 TOP j*
~-P 45 >>> EU L___| ___| MUST EE ATTACHED
(C) (C) @ 0 0 Q szvaoesrmarur, TO PLUG
' ourmv ANTENNA
RF OSC. ANT
FIGURE I. TUBE Kc TRIMMER LOCATIONS AND numsv ANTENNA
(C)John F. Rider

Page 4:

PWR. AMP
MODEL 501
sue * >>* S
gg?/_ :wr 'i 5 Kai 5 1 , , ' 1 . R"
RF AMF! TUNER
FIGURE 2. TOP VIIEW OF CHASSIS
FIGURE 3. BOTTOM VIEW OF CHASSIS
Rider

Page 5:

PAGE 22-148 MOTOROLA
MODEL 501
(C)lTohn F. Rider
same eaee m . ,- same .. . ?;,;?' 6/we sms @
c-5 -,U -, so W: ? _ moo wr m >>r
gm., MF e my Off
_M law _W W;
VONAGE REAUW65 SNOWN WERE M[AS>>R?D FROM T
0: Bmw pawn A _ ' ; . J Y
FREQUENCY R GE ~ 535 VO PGOOKC "N"
ION VOL QONVY
FIGURE 4 . SCHEMATIC DIAGRAM

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