Motorola 508 Schematic

Get a print!
Price: $8.00
In stock
Product Information:
Model:508
Manufacturer:Motorola (Galvin)

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:

PAGE 18-90 MOTOROLA
noncls hoe, 508, 608, 708 MOTOROLA INC.
EQUIPMENT REQUIRED 7. RF ALIGNHDIT
1. A spec lal tool for adjusting the tuner cores. *_ gonnect Signal gene,-aw, no antenna I-agen-
Use Alignment Tool, Motorola Part No. 66A7e2'78. 155512 tnrougn special dummy antenna (eo mmf cam-
2. A small screwdriver for IF & RF ellglment. cum- in series with 21: Coax 1ead)_
5. An accurately calibrated AM modulated signal B_ Hove carnage plate (by burning manual "mms
5e"er"t?r' Shaft) E0 EURXUPEURmEUR hlsh frequency Position and screw
4- A 10W P5589 UUYPVU meter- coll cores out so that at 1eg?g_;;1L?1 of all three
5- A 5995131 d\1lV|mY aflnenna f0T` RF aligilmeni- cores Shall be Outside or the coll Shield CBD. Sei.
Construct dummy antenna as shown ln Figure 1. The slggl generator to 1605 Kc and peak trimmers (5, 6
21' coaxial lead needed ln its construction is the am -nl in this ordeh
same type as used for lead-ln on Hotorola car an- C, Hove the oax-rlage plate (hy turning manual
wma- shaft) so carriage plate ,ls spaced _exactly 1-5/54'
from coll shield plate. Set signal generator to
1425 Kc and adjust coll cores (B, 9 Q 10), ln this
order. tor nzaximum output.
D. Move carrlage plate (by turning manual tuning
PROCEDURE shaft) so carriage plate ls ,spaced BDDTUXIIDBIZEZY
1. Remove one front and rear housings. All oo- 7/52' frem C011 shield plete- Leave eienal senera-
Justmms are now exposem tor connected but turn slglal generator power off.
2_ connect 8 PH speaker (53 ohm vc) to VC sewn, Peek oscillator padder core (ll) for maximum noise.
nal and chassis of receiver and connect the output If the Paddef CUTS ever be m0Ve? N019 than 1/2 UU?"
meter across the voice coll. If the recelver ln- from Us UUBUIBX D?S1f10I\. the carriage plate
"mal speaker is used' ground receiver from h,ms_ should be moved to extreme high frequency position,
mg to Chass1s_ the coll cores (B. 9 & 10) should be screwed out so
5. Connect a s volt storage battery to chassis and than 1'1/3' ?f "Ch Core IS 9190526 BDU S5995 '7A.
BATT terminal of receiver; turn receiver on and B' C 3* D repeated "MU 1? is UBCHSSSPY U0 MOVE Che
allow lt to warm up for a few minutes. Set receiver Dadder ??"e 1@=e than 1/2 we in this S?EURD>>
volume control at ma_nmm_ IMPORTANT: Do not push ln on the alignment tool
4. snnslrlvlrv conraol - rhle control must ne set when ad3"5'1"5 'he '""?' ??PeS- The Sllehieei in-
to provlde 2 5 1/z volts plas on the ar tubes before "ard "esS"'e ?" 'he aliinment f?01 may m0Ve the
augment is stanem Measure this voltage between tuner carriage and result ln inaccurate alignment.
sensitivity control termxnal and chass,s_ 9. SETTING run SENSITIVITY conraol - After ellgn-
6. For greatest accuracy, keep output of receiver ment is Completed' Set signal 3en"3t?" W 600 K0
at awroxnmtely 1 wan (1 wan , L79 volts on Dub and adjust its output to 1.5 mlcrovolts. Adjust 1
put meter) throughout allgnmgnt by reducing gener_ tne sensltlvlty control to provlde 1 watt output
ator output (not receiver volume control) as stages (1 "att = 1-79 V?1?5 ?H UUUDUU mEURUEURF)-
are brought into alignment' 9. ANTENNA TRIHHER ADJUSTMENT -' Once steps 7A, B,
3, Ip ALIGNMENT C, D & 8 have been satisfactorily performed, no
A_ Connem Msn Side of Signal generuor thmugh further adjustment of any alignment screws should
.1 mr capacitor to oBEe grld (pln Q7) and the low be made GXCGDL C0 311511 the antenna trimmer (7) to
side 59 ?hass1s_ Set generator to 455 Kc and peak car antenna after receiver ls installed ln car.
adjustments (L 2_ 5 & 4)_ in this order, for mp This adjustment should be made with antenna fully
hmm out-(put_ extended and rece Iver set to approximately 1400 Kc.
B_ Check alignment by repeating m.?cedm.e_ Peak the trimmer tor maximum volume of a weak sta-
tlon or background noise between stations.
HOUSING PARTS
124472751 Houslng.fr0nt: includes 2 oundln wl ers'
less escutcheon ......... ..... ' ACGESSOMES
15D472547 nouslng, rear ............... ........... 5451494 B?1f- 'J' (reeeiver mba) -..-.......... .
53750 R1ve?; ,122 X 1/3 spggl; anuque copper M4491 Capacitor, generator ...................
f1n15h (gl-Qundmg wiper mg) __________ lX'7f-1340 Lead Assembly, dial light: complete with bulb
535594 Swew; 55 X 1/4 slotted hex head thread 98473111 Lead Assembly, fxme: complete with 10 amp fuse
Quggms Wye, Cam DL (escummmtg) __ 437655 Lockwasher: 5/16 int-ext; cadmium plated (re-
I5S'7458 Screw: Q5 x 1/4 FKA slotted acorn head sheet celver mt8) ..... . ........ ..... ........
metal screw; antique copper f1n1Sh (houslng 352563 N"?= 5/18'16 I 9/16 hex: Cad-D1(reCe1ver
oseeae screw: |10 x 3/e PKA nlaln nex washer neao 1575145 Shaft, flexible: with hens; 24" IOHE ---
sheet metal sg;-ew; md, p1_(sD;g-_m;g) 6X414l Suppressor, distributor .... ............
Rider

Page 2:

PAGE 18~92 MOTOROLA
MODEL 508 MOTOROLA INC.
SE%s|;k`gTY PWR TRANSFORMER
AMP
TO SIGNAL "Sims ' MANUAL
, U "D mmm U PLATE "L"E _
~| ' SET TO I-5/S4"FOR1425KG
: DUMMY SET TO 7/52" FOR osc PAD.AD.JusT.
, ANTENNA AMENNA
LEAD I
'PLUG OSC. R-F ANY 1
FIGURE 1. TUBE & TRIMMER UEATIONS V
SEAS sais sms sus svs-GT
n ,_ I ,,. . .M . . 1 Veil
FIGURE 2. SCHEMATIC DIAGRAM
o John F. Rider

Page 3:

col
O (sold only as
Ill Pi Cal
geese m?E
warns <.>rv??E?<
Q duo
ease :gg
IIOI Ill
C is SMZS4() Paper O06 mr mO?;,?"?" ' ?? ' ? I R-13 1A-#72551 Volume Control: 500, '0 ; includes
0
0
Cap
volume control)
was
gen
mtg. brxt. included
Spark Plate Assembly:
0
III
coil
Old
(C)J'ohn F. Rider

Page 4:

MOTOROLA
win w__;UE_O_& S33 "EQ ? ani" _pS_OOm mowobqm
"mam gg mn ESQ NVE EE N 2 "___m_5m S M
|W_;s gang gs gg w_`_:uE5__m _sgggv
UEUHD Aga: "HQSM oi" K NNT Swim Hobbwm
"Rada H?O___~ gmwgw Nm; k NNT swam Nbbbmm
LQ; Uggd Hggi xwgm mx K NNT Swim cobbwm
Ugqg "ggi "dwg" win R mm?_ 3w>_E Hgbmm
2_5 5200 _"EH wigs EM 203338
___ ____ _:__ ____ ___ was _Saga _gum
mag _QN "wagon ng; ugpugw _Swim
gag ggqg EE 8; N BTS; 3;
________ ______ ________ gauges 'Sig
DIED _*SS gmHB__OO Snag ASU _h_E__;mM< U53
_od 5; w;HQ___3 EEG _rpegg E3
_EEC gag gdzg "_;_Sm" H83 _bag
2 _ sag 84
(C)John F. Rider

Please note: we carry a wide range of products which will fulfill the specifications above. Please use our search function or browse our products to find what you need!