Motorola 501A Schematic

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

Schematics Content:

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Page 1:

MOTOROLA PAGE 22-l 49
GENERAL INFORMATION V
TYPE - Compact automotive type superheterodyne re- 551 54133511221
ceiver with self-contained speaker. Receiver i
designedfor installation in any car when used wit
appropriate Motorola control head.
MODEL 501A
TUNING RANGE ~ 540 to 1600 Kc IF - 455 Kc
TUBE COMPLEMENT -
6BE6 - Converter
6BA6 - IF Amplifier
6AT6 - Det, AVC & AF Amp
6AC)5 - Power Amplifier
5X4 - Rectifier
POWER INPUT - 6. 8 amps at 6. 3 volts
FLEXIBLE SHAFT
RECEPTACLE
FLEXIBLE SHAFT
- RECEPTACLE
IPOWER OUTPUT - 3. 5 watts (max)
_ BATTERY
"""' ' \_ ANTENNA \ out Lum-AY
"' SET 'ro |-|/ns" I | "9"""E ?
me 455% FOR MZSKG ' on off con , ' |:l\a|U?L
I COIL $|HIELD CARRIAGE
PLATE PLATE
ANTENNA
PLUG TO Fur Rccsnvsn
'_ _ _ _ _ _ __ ANTENNA RECEPTACLE
_ . GENERATOR "* ` `\ REQEF-1-nc E
tn , I METAL s>~nE|.o oAN
RF OSC ANT DEV HO 6905lI211-0
FIGURE 1. TUBE AND TRIHHR LOCATIDNS AND DUMHY ANTENNA
Remove receiver front and rear housings to expose all (1 watt= 1. 79 volts on output meter) throughout alignment
by reducing signal generator output as stages are brought
into alignment. Use a small fibre screwdriver when align-
Connect a 6 volt battery to BAT terminal and chassis.
-mg ir and diode transformers. A special toni, Motorola _
.PartNo. eemszvs, is requiredfor adjusting the tuner cores.
IMPORTANT: no not push in on the alignment tool when
Connect a low range output meter across speaker voice
I coil and set volume control at maximum, For greatest ac-
curacy. keep output of receiver at approximately 1 watt :move tuner carriage and result in inaccurate alignment.
adjusting the tuner cores; the slightest inward pressure may
(C)J0hI1 F. Rider

Page 2:

MODEL S011-l
ALIGNMENT CHART \_/
DUMMY GENERATOR GENERATOR
STEP ANTENNA CONNECTION FREQUENCY TUNER SET TO ADJUST REMARKS
ll* ALIGNMENT _
1. .1 mf 6BE6 grid (pin 455 Kc High frequency end (cores 1, Z, 3 sr 4 Peak for maximum
#7) & Chassis out) in order indicated.
check by repeat~
RF ALIGNMENT _
2. See Fig. 1 Antenna recep- 1610 Kc High frequency end; cores 5, 6 & 7 lDeak for _maximum
tacle through should project l-l/S" in order indicated.
dummy frorn cans (screw out ii
3_ ->> ~~ l4Z5Kc 1425 Kc -per Fig. 1 B, 9 sr l0 Peak for maximum \J
in order indicated.
4. When receiver is installed in car, extend antenna fully, set dial to approximately HOD Kc and repeak antenna trimmer
(7) for maximum volume of a weak station or noise between stations.
INSTALLATIGN INFORMATION
Reservists
ANTENNA ,-fa Q ` Q)
ANTENNA YR\MNIER LEAD
omuusf hr moo nel "'AtEk:J?**T ll LOCKWASHER
FIGURE 2. RECEIVER INSTALLATIKN DETAIL ,
INSTALL DISTRIBUTOR SUPPRESSOR hood down tight.
2. Hood Bonds (Motorola Part Number 39A4z05) may
Cut the high tension lead, which runs from the center be installed at the shoulders so that the hood makes a
terminal of the car distributor to the ignition eoii, appi-ox~ good ground tn the env/1 nf the ear.
imately l~l/Z inches from the distributor. see Figure 3.
Screw the distributor suppressor_in series with the two TIRE STATIC
pieces of high tension wire, and plug the end terminal of
I the lead if\?? the ?EURn??1' rewpfacle Of the distributor- After completion of radio installation, road test car for
INSTALL CAPACITOR ON GENERATOR tire statin? on dryi raoncrete and blacktop pavements, under
the following conditions:
Mount the noise suppression capacitor (Motorola Part
Number HA-1491) on the generator frame, under the ground L At b,,?h1,,\,, and high Ca, sPeed5_
lead screw. See liigure 4. Connect the capacitor lead to ;_ with antenna extended to operating position.
*he =fm=\f"1'? feflmhal ?f "H Senefamf- WARN1NG= D0 3. With radio at full volume and tuned of( station.
NOT CONNECT THE CAPACITOR LEAD TO THE FIELD
TERMINAL- If tire static noise is encountered, inyect Tire Static \,/
ADDITIONAL MOTOR NOISE HINTS Elimination Powder lavailable in kit form - Motorola Part
_ Number 5lB59l494) intog tires, following instructions given
I. When checking the car for motor noise, clamp the on the package.
(C)John F. Rider

Page 3:

MOTOROLA PAGE 22-151
' ` MODEL 5o1AI
' 3 neun; 3. nxsrnlsvron supmuzsson nxsrnumon Do NOT CONNECT
' i? i , Q I TO FIELD
Lew 5* 5 5 '> #QE
Q SUPPRESSOR PART N? amazes ` 1 '
PART N"6X414\ GENERATOR A
%{f'~D'YE\- (EM '5PKR~?NLY3 nouns 4. Gmsnnon CAPACITOR INSTALLATION
A swan "S 'S;,~?>* '_ V
SEAS ~ ~ ' '" ' V o 80N-OFF
IF AMP ' _ i"?f' ~ Q, _ A' aj "Nfl V L
ANT R PTAGLE G2 MT-92 Ll L3 L2 cus
ESE TUNER
norms 5. Top vmw or cmsszs
Rl R2 05 C'0__ DIAL Lnsnr an
sees *YF . ,_ _ _ gg; J A Vxqvm ` ,Q ...VI
Cow __ _ _ A . V
R5 T ` . 'f u 'f 14 ' ? RIO
G66 SAQ5 R!5 R17 RH CI3 RIB L6 C15
PWR AMF' FIGURE 6, BO'|'TCl? VIEW OF CHASSIS
@John F. Rider

Page 4:

MODEL 501A REPLACEAILE PARTS LIST
NOTE: When ordering parts, specify model number of set in addition to part number and description of part.
I Ref . Part Ref Part
I 1 E222 Nm mmbe, Description
cxmssxs mums - ELECHIICAL E
Capacitors SP-1 lX59Z328 Spark Plate Assembly: com-
mmf on same brkt as C-4 and
7 (sold only as a assem)...
mmf; on same brkt as C-3
and 7 (sold only as a assem)
580 mmf; on same brkt as
C-3 and 4 (sold only on as a
Transformers
IF, 455 Kc: complete with
tuning cores and padding
capacitors .................
Diode, 455 Kc: complete with
tuning cores and padding
capacitors .................
T-3 251370171 Output Transformer . . .
T-4 2513472533 Power Transformer . . .
CHASSIS PARTS - IECHANICAL
C1iP, coll can mt?...........
assem) 42Al3l77 Clip, center post grounding. . .
C-10 8Rl3l66 Paper: .l mf 400V. _ . (tube socket mtg) '
C-14 sx1702s Paper: .5 mf 1oov. _ _ _ . 9580218 socket ' mbej mm, _ f 7 P gf --
c-15 811490449 paper; .oz mf 1ooov. _ _ with ? y ing " ""' 'P'?"g-
350_350_25v________________ HOUSING PARTS .................. ..... .
Fuse
5;;rato55K16248 9 amp* ' ' ' ' ' ' ` ' ' ' ' 42A472033 Clip, chassis retainer. . . . . . .
T-164 4833333 "on_Sync_ 4_Pin_ _ _ _ _ _ _ _ l3B5l0654 Cloth, speaker grille . . . . . . . . . . . . .
Coils l3D50l358 Escutcheon, speaker: plastic . . _ _ _ _ .
'__l_1_2 24571881 RF and Antenna Coil (specify lX5l0826 Housing and Bushing Assembly, rear .
color of paint dots on old gousxng, front: includes escutcheon
coil when ordering). . . . . . . . cn?" sheet metal: *B X 1' PK-A 51?t'
1.-3 243592153 Oscillator Coil (specify t?d "Um held; antique Copper
color of paint dots on old __ccEss0__n_sfinish (housing screws) . . . . . .
coil when ordering) . _ . . . . . .
L__5 24K78o26 Choke (dial light) _ _ _ 65X4l5l Bulb, pilot light: 6-8V; bayonet
9B4T3ll1 Lead Assembly f s ; 1 t ith
Note: All resistors are insulated carbon type, 9 amp fuge_ _ I _ _?|_?_ _???l?_?_?_Y_ _ _ _
20%, unless otherwise specified. 1X74340 Lead Assembly, dial light : complete
with
R-1 6116032 470,000 23% QI. .. 4S7653 Lockwasher, int-ext: 5/16; stl; cad
R-Z 232% _?l, . . 457657 Lockwasher, ext: #8 ; stl; cad pl
a-5 6113933 220 20% iw. _ _ _ 2S7003 rm: , hex: rs x 5/16; 511; cad P1
n-7 15116287 ssoo 20% 1w. . _ _ _ zszssa Nut , hex: 5/16-18 x 9/16; 551; cad
3_9 686015 22o_000 20% Q' _ _ _ _ _ _ _ _ lK75l48 Shaft, flexible: with housing; 24"
R_10 1gA51081g volume control: 1 meg; 'ith 5o__510__85 1g................................
R__16 5R6975 100300 20% iw _ _ _ 7542 Stud, receiver mtg. . . . . _ . . . . _ . .
R_17 636075 100300 20% iw _ _ _ 6A4l41 Suppressor, distributor . . . _ . . _ . . . .
n-1s snesss 220 10% 1w _ _ . _ . _ 29K7?284 "`?""~"1>> Pi?= fed (fuse lend) . . . _
R_19 6116406 22 10% Q' _ _ _ _ _ _ 29K762B7 Terminal, pin: gray (dial light
(C)John F. Rider

Page 5:

MOTOROLA
MODEL
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*whom ENB Hmsduev megan , _;__mq__ mnwmwss ; _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ gram "ag insane
_ _ _ _ _ _ _ "oysH:m_; "DAM ~_N~nm$$ wnm2? new _:ww ugonag, nmawudcdy L "sz wmmbhkw
_ _ _ _ _ _ _ _ _ _ ____ V _ _ _ gas Bynum _ _ _:Zum E25 Hwang was m=:9_?? Sowssm
Amiga _Ev ___?Hmwm_a___?0 _w_:_am Nmmbhiv _ _ _ _ _ _ _ _ _znsvmmt vom Nudge *Magma _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ whoa _wnfaw mmmbbsv E; _ayggmnu Nam *milk wmgvcuo vmomsg
__ GEMS Hd; _mgwgm Hmwo`_

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