factory prepared technical service data i index on...
TRANSCRIPT
@id §I SYLVANIA STEREO HI-Fl
SUPPLEMENT 2 TO BULLETIN : R74-3
FACTORY PREPARED
TECHNICAL SERVICE DATA I Index on Page 22. /
SERVICE PUBLICATIONS DEPARTMENT Entertainment Products Group 700 Ellicott Street. Batavia, N.Y.
,._ ,upp!emeot_ in_tr~u_ces the R74-4 chassis, _and ~odel R04747. . .
..,R74-4 chassrs 1s similar to the R74-J chass,s, with the addition of a new muting panel and CD4 demodulator arcurts.
_,te schematics and parts lists for the R74-4 chassis are given in this supplement.
END CAP - LEFT HAND 74-36448·2_
J
t l , I \
DIAL BEZEL 74-34928-1
VENT -CABINET TOP 74-34773-1
COVER GLASS 74-34762-1
TUNER BEZEL 74-34763-5
KNOB - TUNING 74-34861-2
NUT · HEADPHONE
JACK MOUNTING
70-32649-1 TOGGLE SWITCH
74-34797-1 BALANCE CONTROL. 74-34859-1
KNOB -BASS,
TREBLE
(INNER SHAFT) .74-34862-1
NON-SKID PAD (4) 86-28719-5
KNOB - BASS, TREBLE
(OUTER SHAFT} 74-34863-1
MODEL: RQ4747 CHASSIS: R 74-4
IMPORTANT: Always use genuine Sylvania replacement parts and tubes .
-1.
KNOB-VOLUME 74-34861-1
END CAPRIGHT HAND 74-36448-1
PUSHBUTTON 74-34913-1
Cl)
C "'t:l ~
r . -m s m 2 --j
I\J --j 0 a, C r r m --j
2
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w
-
SUPP. 2 TO A74•3 EMENT PARTS LIST -- REPLAC SCHEMATIC SERVICE
~ING - ~ DESCRIPTION
fo~~~~TIC ~!~~I~~ - OESCRlrT~ - h ,wise specified)
CAPACITORS (All values in MFD, unless ot e
CAPACITORS (CONTINUED)
·csm - ·. ·~· 43:Sj24s-0 --~· 1x1s: ·160v-i
C2 C3 C4 cs CB C10 C14 C16 C18 C20 C22 C24 C26 C28 C30 C32 C34 C36 C38 C40 C42 C44 C46 C48 cso C52 CS8 C63 C76 C78 CBO C82 C84 C86
- C88 C94 C96 C98 C100 C102 C104 C106 C112 C114 C116 C118 C120 C122 C124 C128 C134 C\36 C\38 C\42 C\44 C146 C148 C302 C306 C308 C314 C316A C316C C318A C318C C320A C320C C322A C322C C324 C326 C344 C346 C402
42-34768-1
42-34941-1
42-1814&1
Mein Tuning Gong 33or F, zsr 330Pf , ZSP 33orF, zsr 330PF. zsr 10Pf, NPO 18Pf, NPO .01 , 100v 3.3Pf , NPO 330Pf, ZSP 3.3Pf , NPO ,01, 100V .01, 100v Trimmer .01, 100v .01. 100v .01 . 100v 33Pf , N150 .02. 100v .02, 100v ,01, 100V .01 . 100v ,02, 100V 33Pf .01, 100V 330Pf, ZSP 820Pf , ZSP ,01, 100V Ceramic Trimmer .01 , 100V .01, t1l0V 10PF, NPo' .01, 100V 100PF, ZSP .05, sov .05, SOV .01, 100V .01, 100V 100PF, ZSP .OS, 50V 330Pf, ZSP .01, 100V 4.7PF , N150 4700PF, ZSU .05, SOV .02, 100V .01, 100V 15PF .01, 100V 2.2PF, NPO .05,SOV 33PF, N150 .05,SOV 180PF, 25P 560PF, ZSP 270PF, ZSP .047, 150V 100PF, ZSP .0082 .022, 250V .047, 150V .039 .0068 .22, 150V .039 .0068 .039 .039 .22, 150V .01, 100V .01 , 100V .01, 100V 220PF, 25P .1, 150V
,c500 j ,.L,~,3::9~ :h .:. ,oos, 1soy_~ csoa ,1, 150v ••·•
.2.
e510 ,1, 160V C512 ,1, 150V CS34 ,1, 150V C540 .01 , 100V C603 ,01, 1 OOV C606 ,04 7, 150V C608 ,047, 150V C610 820PF, 25P C614 33PF, N \ 50 C618 ,1, 150V C620 .1, 150V C622 1200P F, ZSP C624 560P F, ZSP C625 .01, 1 OOV C627 .01, 100V C629 5.6PF ::632 10PF, NPO C634 .01, 100V C636 .01, 1 oov C638 330PF, 25P C640 330PF, 25P C642 .01, 150V C644 ,01, 100V
ELECTROLYTIC CAPACITORS (Values are shown as : MFD/Working Voltage)
CS4 C60 C72 C74 C90 C92 C108 C132 C140 C150 C151 C301 C310 C312 C342 C514 C516 CS18 CS20 CS22 C524 C528 C530 C532 C536 C538 CS44 C560 C562 C602 C604 C612 C616 C626 C628 C630
41-32477-46 41-324 77-46 41 -32477-85 41-32477-85 41-32477-46 41-32477-85 41 -32477-3 41 -32477-47 41 -32477-86 41-32477-9 41-32477-33 41-23765-16 41-32477-9 41-32477-86 41-324 77-85 41-36386-1 41-36386·1 41 -36386-1 41 -36386-1 41 -32477-67 41-32477-67 41-32477-95 41-32477-67 41-32477 -95 41-32477-67 41-32477-67 41-23765-5 41-23762-54 41-23762-54 41-32477 -34 41-23765-17 41-32477-86 41-32477-86 41-23765-17 41 -32477-50 41-32477 -51
5/25V 5/25V 1/50V 1/SOV 5/25V 1/50V 10/15V 10/25V 2/50V 100/6V 10/15V 1/50V 100/6V 2/50V 1/SOV 5000/40V 5000/40V 5000/40V 5000/40V 500/35V 500/35V 500/SOV 500/35V 500/SOV 500/35V 500/35V 5/25V 100/15V 100/15V 25/15V 2/50V 2/50V 2/SOV 2/SOV 50/25V 100/25V
POLYSTYRENE CAPACITORS
C56 C64 C68 C70 C126
40-28121 ·1 40-28121 ... 40-10285-13 40-10285-1 J 40-10285 -50
10 OOOPF • SOV 2500PF • 50V 330PF . 125V 330PF , 125V
390rF . 12sv
SERVICE
- _--REPLACEMENTP ARTS LIST (CONTINUED) -
DESCRIPTION SCHEMATIC CODING
SERVICE fl'IG PART NO.
1s1STOflS (All 1/4W, Carbon, 5_%, unless otherwise specified) PART NO. DESCRIPTION
RESISTORS (C~EDI
124 21
121 30
132 IM
11131 111aa 11140 11142 11144 Jl141 11148
37-14576-5
37-1457&15
660 ohm 10K 3.3K 1K 4.7K 270ohm 22K 10K 10K 22K 330 ohm 1K 100 ohm 5.6K 270 ohm 180 ohm 820 ohm 15K 330 ohm 390 ohm 16K 1K 1 K Variable • FM Meter Zero 1.5K 150 ohm 4.7K 330 ohm Variable • Separat ion 220 ohm 3.9K 3.9K 470 ohm 100K 470ohm 100K 33K 33K 22K 10K 2.2K 100 ohm 56K 100K 330K 10K 120K 100K 120K 100K 56K 33K 1K 10K 22K 1K 150 ohm, 1r:m. 10% 1K 22K 82K I .SK 560 ohm 10K 2,K 120K 4.7K 33 ohm 150K 33K 470 ohm 3.3K 10K 150K 100K 100K 10K
R149 RISO R152 R301 A304 A306 R308 R310 R312 R314 A315 R316· R318 R320 R322 R324 A324A, C R326 R402 R404 R502 A504 R506 R508 R512 R514 R516 R518 R520 R570 A572 R602 R604 R606 R607 A608 R609 A610 A612 R614 R616 R618 R620 R622 R624 R626 R628 R630 R632 R634 A636 R638A8/CD A638AC · R638BD R639 R640 R642 R644 R646 R648 R650 R652 R654 R656 R658 R660 R662 R664 R668 R672 R684 RG86 R688 _R690
37-34611-3
37..!2053-3 37-22053-3
37-34651 -1 37-34651-1
37-34908-2 37-34909-2 37-34909-2
37-33717-6
36-34726-7 • 36,-34726-0
100K 18K 4.7K 100K 10K IOK 120K 220 ohm 820 ohm 47K 47K (Early Prod.I 4.7K 3.6K 4,3K 3.6K 7.SK 4.3K 47K SOK Variable - Four Section Volume 4.7K 3.3 meg. 1/2W, 10% 68ohm 68 ohm 330 ohm, 1W, 10% 10 meg. 1/21'1. 10% 3.9K 2.2K 220 ohm, 1W, 10% 220 chm, 1/'ZW, 10% SK Variable • C04 Balance SK Variable - CD4 Balance 180K 33K 3.3K 5.6K 10K 4.7K 100K Var~ble • Four Se.: :ion Bas.s 100K Variable• Four Section Treble 15K 39K 10K 470K 3.3K 15K 10 meg, 10% 33K 27K 27K 3.3K 5.6K 100K Variable - Dual Front/Rear Bal. 100K Variable• L/R Front Balonce 100K Variable• L/R Rear Balance 100K 82K 10K 470 ohm 10K 1K 10K 3.3K, 1/2W, 10% 820 ohm 270 ohm
~ ~~: Variub le - Bias Adjust
\Dohm 3.3K, 1/21'1. 10% 150 ohm 2.7 ohm, 1/21'1, 10"" 150 ohm 2.7 ohm, 112W. 10:':. .24 ohm. ZW , w,w ,27 ohm, .:.v, W/W
BOTTOM FOIL
-----------------------7 ---- G "•-- -~-- ---rll'-'~ "8••· .. • ...,..~ .... tr:"
.7.
- SCHEMATIC DIAGRAM (AMP) -
-----------------------
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-- SCHEMATIC DIAGRAM (AMP) -
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; .. --. --TRANSISTOR REPLACEMENT GUIDE --
. . :.
_>
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SYLVA~IA TYPE- -PART . . (ALL NUMIER SILICONI APPLICATION
.... , :
-~ ~ 1,.23824-1 NPN . ··.., ..__ QB. Fint FM IF.
- . ·~' a10. Second FM IF. ~ . . ...:. -· , 012 • Third FM IF.
- • 014 • Mettr AGC Ampllfltr.
f'~_:_:_-__ ::;_•~-,;\f: !:~: -~:_' -~_/: ·. ::~ ~~=::.;.ump SV.itch. - ---. i i1S-28392~1~ . • NPN ~· '.-. 01114 --CW'Nntllmlltt.
, · 13-28393-1 PNP ·," •• 08111- Current Llmlm. .. ~ .. , ·1J.~, .fET•N, CH. 06501Mut9Pantll•AudioMut9. . :• · · · ~ -,~~~~- -~ -:;. ,9111•Nolll_A/rclllfltr. · . • .. :
; .-_\:l _·_c"'_,-.~-_::,'r:'.·_~--·_.-::-:: :'.::,+,-_.::;:,..-~ -: · __ °"."' ·?,-., .Ott~ Act1'4 FUt1r/Mmr.O'.~· • ..-- ., ---?::-,;~ ... ,,.~~ .-Qlt2 • lllar1'80uletor.. . .
·13-"Z97-7&-1 .. l'fl'N' .. -:' · .' Cl804 • Active Filr.r. · ·1~02-3 · ·NPN:~.:-,.r,; 0822 ·,_Output.
~-·$. ._;_ ·• ._ ' ....... ';:;J'-;,'j -~r-.-..::,'"\S,::; • --·· .,_ Ou-•t. -r.' .!C~ -~~ ;' ~-~,-- '~~~i ;;;~~- .,...
: _ •• ..., _13-34004-_1-0
PNl'C:·' . ··; QGO-Drlwr. 13-34041>-2 NPf.l ' .. 022. AM IF Ampllfitt. 13-3404&-1 NPN ~ ~ . '- 0502 • Regulator Amplifier.
- 13-343157-3 l'tll~ <.. ,Q806 . MATCHED Oifftrential Input. ~ --:, . • , f'~"-< .~ /: ~---~'17!;:__-t._ Jla; MATCHED Olfftrantial Input.
1 S-3435-1 . l'NI' · ,. OIi · FM Otcillator. 13-34371~1 - NPN. · -·~ •-, 01110· l're Ori-. 13-34375-1 FET-N: CH. oi _- FM Mixer. 13-3431&-1 , FET-N; CH. Q2 • FM RF Amplif191'. 13-34381'1 NPN Clll02 • Ton• Ampllfiar. 1~1 PNP . Q18 • AM RF Ampllflar.
__ occuRAENT,GA1N .. . ··-
I-z w I[ z a: -u:, <
Que>
27-275
100-360 100-350 90-270 90-270 N/A 20CMOO
5eOOMIN, 30MIN,
90-270 90-270 80-200 10-150 SEE BELOW
20MIN. 90-270 N/A N/A 225-450 50-150
)(
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15 Ill
jllli 9w• i ~u~ ~! ~~! ~1~ ~s ~ :I - • a: ' C, a: C, :, ... C, 111z111 111 • W ::E<w ~<0 ~~0 -!: 0 -a:lll -< ID ~~!!) ~e. !~; 200
35V 3V 110mW
32V 4V 200mW 11V 4V 200mW 46V 4V ·. IOOmW 45V 4V 500mW 30V 30V 200mw 411V 4V ~w
,,. __ " . --~ 2tiV 10V ::"~ 72V !IV
• r, .
70V sv ~ 70V 6V 700mW 12V 3V 250mW 40V 4V 2.1W 50V 4V 300mW
-20V B5V N/A 110V 4V 500mW NIA 25V 200mW 20V 10V 250mW 30V 4V 200mw 30V 4V 200mW
~
~ Ill cc a: :I a:, (/)
c,W 111:I z a:
01- - - :, ID<)( (Ile,
2!2 ~ <-ID U.
1uA 1,2, 3
.29uA 3,4 ,211uA 3,4 100nA 4,11, 11 100nA 4,11 N/A 7,8 .09uA 3,4
100nA 3.4 . ""A 9
•.•
N/A 11: 10, 11, 12 N/A I, 10, 11, 12 100nA 3 100JA 13 10uA 3,4. 14
100nA 1 100nA 4, 10 N/A 7, 11 N/A 7, 15 .26uA 3,4 100nA 3,4
; "!~-:'_, ·. ~- ,. .• BROWN DDT _ . 100-160 .
·RED DOT .. 160-210 ORANGE DOT 200-260 YELLOW DOT ·: · 250-310
0 ~ Q 8 <'.---) E 8 C
GREEN .OOT_ · : ... ~ 300-300 1 2 3 4 6
lJ 8
B C E
~ PLANE 9
e, 10
E B C
l•••I SEATINg,/ PLANE 12
w 16
--CABINET PARTS LIST R04747 --SERVICE
DESCRIPTION PART NO. DESCRIPTION
FM Anitnn1 27-14926-2 Pushbutton Gulde - 2 Button Pushbu1ton Guide • 6 Button
BEZEL Spted Clip• Dial Bezel to Escutcheon Cowr GI• 74-34762-1 Speed Clip • Gleu to Bezel Dial 74-34928-1 Tuner Knob• Balance Control 74-34859-1
. Knob• B•. Treble (lnlllf' Shift) 74-34862·1 CABINET Knob· 81&1, Trtbll (Outer Shah) 74-34863-1 End Cap· Left Hind Knob• Top Mitch 74-34797-1 End Cap· Right Hend Knob- Tuning 74-34861-2 Non-Skid Pad, Cabinet Bottom
.. Knob· Volume 74-34861-1 Vent - Cabinet Bottom Nut • Halphont .llek Mollntillg 70-32649-1 Vent - Cabinet Top
' 'Ulflblltton · ·· 74-34913-1
-12-
·•
SERVICE PART NO.
74.34929.2 74-34929-1 70-34933-1 70-26679-1 74-34763-5
74-36448-2 ---74-38441 &i,2111N ,~.,.,., 74-34771-1
SUPP, 2 TO ~74~ .
CD4PANEL--
CAPACITORS
-13-
- C182
~~=---C154
~ ~~~~~=--.i-C152
--~ C1198
·. ~~l- e2• -· ~ (
C248
-.-; . C21M <-;_ C278
C244
C264
C227
C224
C284
C260
C282
,,,_ ---C258
C220
C256
254
C252
"1'14 C250 ~
, j) ' ~ -:as C262
. - ~ ~ / . r•3:°1 n: x ·
• - I
r
--- CD4 PANEL
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- SCHEMATIC DIAQr. . ' cooER)~
riAlltf (CO, oE -=·-=--=--=--=-··-:_-:_-:_-_-_1----,---i
MU 1111 ·
~------------l11:!<101=:---,._+------.•,oo---+-•~'"'.,ca, t.n
h; ~ll IOOlc rJ:4 ♦ Y!
un "2,..--,CM.
UIOUT
T0U1TCH, K"IUTKMI CONTIIOl
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UM Ql4 INZ J .)I. .47 !<IV 11«
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------------------
TOC04 IND. L.t.11,
+ CIN . ~ CH4 . m IIZH fflt
-18-
, ... L ...
"2H 47K
S\Jl'P. 2 TO R74-3
~vn-. ~ 1 0 R 74-3
SCHEMATIC SERVICE ~ fi~EMENT PARTS LIST (CD4 PANELi -
COOING p ART NO. - DEICRIPTION
CAPACITORS (All nlu. in MFD . . c102 'uni"' otti_,,. apeclfled) C104 41-32477-46 ll/2tSV Electrolytic Cl<)8 .0047. IIIOV C108 .0068 Cl 10 40-l028S-60 390PF Polvnvren• Cll2 .01. 1110V C114 40-IQ28S.6S 1200PF Polyatyrene
C116 6600PF C118 41 -32477~6 6/26V ElectTOlytlc CIIII 41 -32477-38 2II0/16V ElectTOlytlc C120 ,01. 100V C122 3300PF C124 2200PF C126 680PF,Z6P C127 41 -32477-34 25/16V Electrolytic
C128 220PF Cl30 41 -324?7-38 250/16V Electrolytic C1 38 3300PF _ . C142 lOOOP~ C144
3300PF
C146 41 -34346-2 .22f25V ElectrOlytlc C148 :.-::!..48 B8/35V Electrelytic C150
41-3
2477-46 .oon. 5"-Polyatyrene
C 152 5/25V Electr0lytlc
C154 - 2200PF ClS6 . Cl-39l48-84 .47/SOV Elecmilytlc C168 41-39148-&4 4~v Elec,trolytic
C160 .01 . Z5U C182 47PF C164 .0082 C186 .0068 C168 40-10285-50 390PF Potvnvr-C170 .01, 150V C172 40-10285-65 1200PF Polynyr-C174 6600l'F C176 41-324n-48 5/25V ElectrOlytic cne .01.zsu C180 41-324n-46 5/25V Elec:trolytlc C182 41-324n-46 5/25V Electn'.llvtlc C184 41-324n-46 5/25V Eiec;trolytic C188 41-32477-38 250115V Electrolytic C202 41-324n-46 5/25V E1ec:trolytic C204 · .0047. 150V c:zoe .0068 C208 40-10285-60 390PF PotvatY,_ C210 .DI. 150V C212 40-10285-66 1200PF Potynyrene C214 5600PF C218 4142477-48 5125V Electrolytic C2111 41 9Ml l~ ffOl15V-£~ e2111 .01.1oov C220 3300PF
-c:222 2200PF C224 680PF,Z5P C226 41-32477-34 25/16V Electrolytic
C227 220f'F C228 41-32477-38 250/15V Electrolytic C230 3300PF C238 toooPF C242 3300PF C244 41-34346-2 .22/25V Electrolytic C246 41-39324-149 .SS/35V Electrolytic C248 40· 10286-44 .0027, 5" • Polystyrene C250 41-32477-46 5/25\/ Electrolytic C2!52 2200P F C:254 41 -39148-&4 .A7/50V Electrolytic C256 41 •39148-&4 .A7/50V Electrolytic C258 47PF c:zeo .01, Z6U C2tl2 47PF
C264 ,0082 C2&II .0068 C288 40.10285-50 390PF Polystyrene
C270 .01. 150V
SCHEMATIC COOING
a!RVICE
~ OESCRIP1'~
CAPACITORS (CONTINUED) C272 40-10285-55 120(ll'F Polv11vren•
C27 4 !5600f' F C276 41 -32477-46 6/25V E1ectro1v11c C278 .01 , Z6U C282 41-32477-48 6/'Zf>V El,ctr0IY1 IC C284 41-32477-46 5/'lfN Electrolvtlc
ill ,pedflldl RESISTORS (All 1/4W, Carbon. 5~ unlest othlrW . ·
R101 R102 R104 R106 RIOS R110 R112 Rl14 R118 R118 R120 R122 R124 R125 R127 . R128 R129 R132 R134 R136 R138 R140 R142 R144 R146 R148 RISO R152 R156 R158 RIIIO R152 R164 R166 R168 R201 R202 R204 R206
"R208 R210 R212 R214 R216 R218 R220 R222 R224 R226 R227 R228 R229 R232 R234 R236 R238 R240 R242 R244 R246 R248 R250 R262 R256 R268
-19·
470K 47K 18K 2.2K 2.2K lmeG 12K 100K 1110 ohm 330ohm 100K 47K 10K 2.7K 100 ohm 220ohm 1.5K
37-14576-16 : :~~ Veriablt · V,C.0, Adjust 8.2K 3.3K 100K 15K 15K 100K 22K 3.6K 2.2K 2.2K 330 ohm 100K 150K 2.7K 47K 47K 470K 47K 18K 2.2K 2.2K . 1-mlll 12K 100K 180ohm 330ohm 1001< 47K 10K 2,71( 100ohm 220ohm 1.5K 6.8K
37-14576-16 4,71( Variable• V.C.0. Adjull 8.2K 3.3K 100K 15K 16K 100K 22K 3.6K 2.2K 2.21( 330ohm
. PANELi (CONTINUED) -
-- REPLACEMENT PARTS LIST (C04 SCHE...,.TIC SERVICE oUCfl ll'1'
1~
CODING ~ T NO, -
RESISTORS 1coNTINUEDI 7,711'.
R264 R266 R2'111 SOLID STATE DEVICES
IC100 IC200
SC102 SC202
COI LS
L102 L104 L106 L1 08 L114 L116 L118 L.202 L204 LZ>6 _L..208 L214 L216 L218
1&-:16647- 1 16-36647-1 72..J668&-1 13-17596•2 13-1759&-2
.MISCELLANEOUS PARTS
SK100 SK102 SK104 51(,207 SK204
73-36679-5 73-36679-3 73,-36679-3 73-36679-3 73-36679-3 72-35686-1
47!( 47K
Lof t Ct,anf\ • 1 ~ ... Ri9h t c1>enn• I ....--28 pir> IC socket
o l<)de
oiode
32M H • p.djustebl• 73,Sr.lH . ,4djUI~
100MH 10Mt-f 1oMt-f 3
2',!H . ,Adju,toi>le
23_ 5MH • AdiUStable
3:zMH · ,'ld jU1'3ble 23.sMH • ,Adjustabl•
100MH 10MH 1oMH 32Mt-f • Adjus t»t>'• 23.SMH - Adiut"'ble
eonnec:to< . 5 pin eonnecto< - Laft en-nnel Inpu t c onnector . U l t c.,.,,,..,1 OutPUt CoM ectO' . Rigllt CM " ,,., Input eonn~r . Ri9'11 CJ\al\l\81 OutPU l 5ock11'1 _ ln,_,.twd Circuit
- SPEAK ER PROT ECTION CIRCUIT -
SCHEMATIC CODI NG
C1202 C1204 C1206 01202 0 1204 R1206 R1208 R1 210 R1212 R1 214 R1216 R121 8 R1220 RV1202 SC1202 SC1204 SC1206
SERVICE PARTN0-
41-32477-85 41 -32477-50 41-3 2477-85 13-26386..J 13-29033-3
3 1-39947-2 13-17596-10 13,17596-10 13-17596-10 72-27200-6
DESCRIPTION
1M FO, 50V Electrolytic 50MF O, 25V Electrolyt ic 1MF O, SOV Electrolytic Transistor • Rel.av Driver Transistor ~ Volt~ Amp Resistor • 1 OOK . 1 /4W , 5% - Carbon Resistor - 22K, 1/4W, 5" • Carbon RH istor • 220K, l/4W, 5% • Ca rbon Anis-tor • 47K, 1/4W, 5% • Carbon Resis tor • 100K , l/4W, 5%. Carbon Resistor• 47K , 1/4W, 5% • Carbon Resistor • 47K, 1/4W , 5% . Carbon Rni1tor · 47K , 1/4W, 5 '!1. • Carbon Relay Diode Diode Diode Smell 3-9in Transistor Socket
-20- J
-- SPEAKER PROTECTION PANEL --
; . ' . J
80TTOM fOll
■
-
SUPP. 2 TO A'74-3
---PRO,DUCT SAFETY GUIDELINES .FOR ALL PRODUCTS --
CAUTION: Do NOT modify any circuit. Se"lce work should be perfonned only after you.,. thoroughly famllla, ,· following Nfety checks. Rbk of potential hazards end Injury to the user incre•ae• If .. fety check, •re not adhered to, With Ill Of U,.
--- SAFETY CHECKS ---SUBJECT: Fire & Shock Huard . . . . l. Be ~re that-~ component, UC .positloned in such a way to .
avoid PONibility of aborts to acijaccnt components. Thu is especially important on thoac chu1i1 which arc transported to and from the repair ahop. . . . .
2. Alway, replace all protectwe device■ ,uch u insulator■ and barrier, after working on a act. ..
.UMFD AC type capacitor, betwce~ a k p-ound (water pipe, conduit, etc.) and the no"11 !l>Od part■, one at a time. Meuurc the AC v:i~P<>le(l 111 ~ combination 1500 ohm rcmtor and ,15M1' q~ Reverse the AC plug on the set and rep ]) capacitoi'
. mcuurcmcnt1 again:for each exposed mct~t AC 'WI~· mcuurcd muat not exceed .! ·volts R,M.S, T~art. \'01~: to 0.2 milliamp AC. · • corr"Polllli
!. Check for damaged imwatlon on wire■ including the AC cord. . · · · .
4. Check acroa-the-line component■ 'for damage and replace if necessary, - ·
5. After re--...embly ·of the act, alw~y1 perform an AC leabge test on ~e n~acd metallic.parts of the.cabinet ~ch u the knob,, antenna terminals. etc. to be sure the ■cth safe to . .. operate without danger of electrical shock. Do not uac a line isolation transformer during tlµs teat. Uae an AC
Any value exceeding this limit constitutes a P0tcn . - hazard arid mu■t be corrected immediately, tialsboq
AC VOLTMETER
voltmeter having 5000 obmi per volt or more sensitivity in good earth ground . the following manner: · such u the water . Connect a 1500 ohm 10 .watt remtor, _paralleled · by ·- , · .. pipe, co~uit, etc. :
. . .. ·. - · .: ~ .
1500.n - . , -.... -._,._ ..... ,ow· . . . . ,
---INDEX---
CONnNn ~ Parts lda1tifution -·Audio Mute Panel _________________ &
- CD4 Decoder Panel 13 - Speaker Protection Panel 21
Repla~ Pam List - Audio Mute ,._ .. 1 5 - CD4 Decoder Panel 19 - Cabinet 12 - Main Amplifl• 2 • Speaker Protection Panel 20
Schem.Cic Diagram • CD4 Decoder 17 - R74--1 Amplifier 7 - R74 Tuner 10
Tranlistor Replacement Gulde 12
Printed in U.S. A.
·22-
Place this Probt on each '1J>oltd
ltltbllic P11t I