Telefunken CN 750 Service Manual

Page 2

Elektn'sche Messungen und Einstellungen

Punkte Art der Einstellung Beschreibung Einstellung Sollwert

1 DIN-Eingangsverstarker NF-Generator an BU 101 (1/4-2); Taste .,Hoch gedriickt Ua > 340 mV an MP 301/1301
U,3 = 1mV/k(2(0ber1M(l)
t = 315 Hz
NF-Voltmeter an MP 301/1301

2 Line-Eingangsverstarker NF-Generator an BU 105/1105 Einsteller R 1 U. = 600 mV an 302/1302
U.=1V;f=315l~lz
NF-Voltmeter an MP 302/1302

3 MPX-Filter NF-Generator an BU 105/1105 Generator an Dampfung 2 36 dB am Filter
Eingangsspannung (l: 315 Hz) 19 kHz 59

Subsonic-Filter Ue = 1 V so einstellen. daB die a) f = 40 HZ Dampfung § 5 dB am Filter
Ausgangsspannung Ua = 600 mV b = 20 HZ Damplung g 10 dB am Filter
an MP 302/1302 e) f = 10 Hz Dampfung : 22 dB am Filter

4 LED~Anzeige NF-Generator an BU 105/1105 a) Abgleich R 328/1326
Us so wéhlen. daB sich an MP 302/1302 o) Korrektur R 328/1328 91 LED (griin) 0 dB Ieuchtet
Uu = 600 mV ergeben. HlGH COM aus. Us = t 0,5 dB
5 Test Oszillator Nur bei gedrflckter Taste ,.Test Einsteller R 515/516 Us = 600 mV : 0.5 dB an MP 302/1302
NF-Voltmeter an MP 302/1302
6 Kompressormessung flF-Ggerl/erfatogfg EU 105/1105 HIGH COM aus u, = 600 mV an BU 107/1107
a = ; = 2
NF- Voltmeter an BU 107/1107
Einsteller R1 in Stellung U. = 600 mV HIGH COM ein Ua = 600 mV 1 0,5 dB
an MP 302/1302 (s. Pkt. 2)
7 Ausgangsstule NF-Generator an EU 105/1105 Einsteller R 330/1330 U = 1 7 +
Uji so wéhlen, dal} sich an MP 303/1303 auf Ftechtsanschlag a ' V _ 0'1 V an BU 106M106
Un = 600 mV ergebenr t = 315 Hz Monitorschalter
NF-VoItmeter an BU 106/1106 nach unten (aus)
NF-Generator an BU 108/1108 Einsteller Ft 329/1329 _
8 Expandermessung Us =1 V; t = 315 Hz U;i » 600 mV an MP 303/1303
NF-Voltmeter an 303/1303 b . .
an BU106/1106 ZW Einsteller R 330/1330 0n = 1v an BU 106/1106
9 PrUfen des HIGH COM gscogger mitILegrband an 1.H|GHCOMausgeschaltet 20 dB rauschpegelabsenkung
ansc 1e en . . .. .
2. HI C M
Auf Wiedergabe schalten GH 0 elngeschaltet Rauschen w1rd horbar vermlndert

Measuring and adjusting instructions (electrical)

Item To adjust Description Alignment Ratings
1 DIN-Input amplifier Connect AF generatorto BU101(1/4»2); The button "High" Output voltage Um Z 340 mV
input voltage U. = 1 mV/kn depressed to MP 301/1301
Over 1 M11; f = 315 Hz
AF voltmeter to MP 301/1301
2 Line-Input amplifier Connect AF generator to BU 105/1105 Adjustment with R 1 Output voltage Us". = 600 mV
with inputvoltage U.=1Vandt= 315 Hz to MP 302/1302
AF voltmeter to MP 302/1302
3 MPX-filter Connect AF generator to BU 105/1105 01163 if: generator 19 kHz damping g 36 dB at filter
a z
Subsonic-filter Supply 315 Hz and 1 Vin such a way a) at 40 Hz damping g 5 dB
that 600 mV are present at output b) 8 20 H1 damping ; 10 dB
C) at 10 H2 damping i 22 dB
4 LED-indicator Connect AF generator to BU 105/1105 a) alignment R 328/1328
supply with f = 315 Hz and input voltage .
in such a way that at 600 mV are present b)80:re+c305ndl38328/1328 9' LED (green) 0 dB gleam
at MP 303/1303 HIGH COM "off" I - ~
5 Test oscillator With the button "Test" depressed Adjustment with Output voltage UM. = 600 mV
Conned AF voltmeter to MP 302/1302 R 515/516 1- 0.5 dB at MP 302/1302
Connect AF generator to BU 105/1105 , =
6 Compressor with inputvoltage U. : 1Vand f = 315 Hz HIGH COM swnched out gfltpgnlflsgge Uom 600 mV to
Connect AF voltmeter to EU 107/1107
Adjust R 1 so that a level of 600 mV is HIGH COM switched in 0MPt voltage Uoul = 600 mV
measured at MP 302/1302 (see item 2) j t 0.5 dB to BU 107/1107
7 Outputamplifier 00""90' .AF geneam t° 3. 105/1 05 Adjuster R 330/1330 Output voltage um. = 117 x 0.1 v
supply With 1 = 315Hz and lnputvoltage tth . ht t tBU106/1106
in such a way that an output voltage = a e "9 5 op a
600 mV present at MP303/1303. f = 315 Hz Monitor switch "oft"
Connect AF voltmeter to BU 106/11fi5
3 Ex ands, Connect AF generator to BU 108/1108, Asiiustement Output voltage Um = 600 "IV
D supp|y with input voltage U. : tv and With Ft 329/1329 at MP 303/1303
f: 315 Hz Connect AF voltmeter to MP Adjustement =
303/1303 or to BU 106/1106 with 330/1330 0mm "wage U 'V at EU 106/1106
9 Checking the HIGH COM Connect a recorder with blank 1, HIGH COM switched out 20 dB A eff reduction in noise level
53,6 9 BU 03 2 HIGH COM switched in Noise is noticeably reduced
Set In playing back

Page 9

Ersaizteilliste - Spare parts list - Liste de pieces de rechange

Wichtig: Bei Ersatzteilbesteilungen bitte unbedingt die neunsteilige Bestellnummer angeben!
N. B.: When demanding Spare Parts it is absolutely necessary to quote the nine digit Part Number!
Important: Lors d'une commande de pieces de rechange. priere dindiquer en tout cas Ie numéro de la piece a 9 chiffres!

gesteIl-Nr
- tock-No. -
Posrtion No. (1 article Bezeichnung Item Description
1 339130006 Frontblende br. vollst. front mask. cpl, masque frontal, cpl.
1 339130007 Frontblende ch. voilst, front mask. cpl, masque frontal. cpl.
2 309796047 Gehause. braun vollst, cabinet. cpl. boitier. cpl,
2 309796049 Gehause. schw. vollst. cabinet cpl. boitier. cpl.
3 339375006 Abdeckung for Ansteuerung modulation cover cache p. instr, de modulation
5 309809951 Kippschalterknopf knob f. toggle switch bouton bascule
6 309833585 Staubschutz knob cover cache bouton
7 339220006 Randel - Knopf mit Achse milled knob with shaft molette avec axe
8 339200959 Drehknopfl variable knob bouton variable
9 339200960 Drehknopf ll variable knob bouton variable
10 309921921 Netzschaltstange mit Knopf mains switch rod with knob tringle interruptrice avec bouton
12 339870958 Filhrung for Kippschalter guide for toggle switch guidage p. commutateur a bascuie
13 309866985 FCIhrung fUr Netztaste guide for mains button guidage p. touche secteur
14 339061750 GummifuB rubber foot pied en caoutchouc
R 1 339500953 Rast~Schichtdrehwiderstand 2 x 20 k film variable resistor resistance variable a cran darrét
Tr1 339310006 Netztrafo. vollst. mains transformer transtro d'alimentation secteur
S 1 309 630 023 Netzschalter mains switch interrupteur secteur
Fu 1 309 627 917 G-Schmelzeinsatz T 80 mA fuse fusible
Le 1 309695935 Netzieitung mains cable cable secteur
15 339335006 Grundplatte, vollst. basis board, cpl. plaque principals et
0301304318. 309410655 AL 1301. 1304.
1318
0303.321. 309411659 AL-Elko 22 pF 25V AL-Elko 22 [1F 25V AL-Elko 22 p.F 25V
1303. 1321
C312.1312 309411677 AL-Elko10pF25V AL-Elko 10,11: 25V AL-Elko 10 F 25V
0314,1314. 309410641 AL-Elko 4.7 FF 25V AL-Eiko 4.7 ,u.F 25V AL-Elko 4.7 p.F 25V
322. 1322
C 503 309414737 AL-Elko 2200 ,u.F 40 V AL-Elko 2200 HF 40 V AL-Eiko 2200 HF 40 V
C504 309414791 AL-Elko 470 F 35V AL-Elko 470 pF 35 V AL-Elko 470 pF 35V
0505-509. 309413482 AL-Elko 100 uF 25V AL-Elko 100 #F 25V AL-Elko 100 MP 25V
516. 517. 519
C512.515.518 309411695 AL-Elko10pF50V AL-Elko 10 pF 50V AL-Elko 10 MF 50V
D 501 339529149 Leuchtdiode CQY 86 gr luminescent diode green 1 diode lumineuse. vert1
D 502 309327053 Leuchtdiode CQY 85 rt luminescent diode red 1 diode lumineuse. rouge 1
D 301-304. 309325927 Diode 1 N 4148 Diode 1 N 4148 Diode 1 N 4148
1301-1304
Fl 301. 1301 339365006 MPX-Filter MPX-filter filtre MPX
FU 501.502 309627901 G-Schmelzeinsatz T 315 mA fuse fusible
GR 501 309322903 Gleichrichter B 60 C 800 rectifier redresseur
IC 301 309368212 IC HA 1457 IC HA 1457 10 HA 1457
IC 302. 303 339335855 10 MC 1458 CP1 IC MC 1458 CP1 lC MC 1458 CP1
lC 501 309368105 IC 7818 UC IC 7818 UC IC 7818 UC
IC 502 339575126 iC VA 7918 10 VA 7918 IC VA 7918
LA 501 339560080 Zwerglampe 13.5 V 15 mA miniature bulb ampoule miniature
R 29 339500006 Schichtwiderstand film variable resistor resistance variable a couche
R 515. 516. 309 509 735 Trimmwiderstand 25 K film variable resistor resistance variable a couche
1328
S 301.302 309639980 Kippschalter ohne Knopf 2 x UM toggle switch without button commutateur a bascule. sans bouton
S 303. 304 309639977 Kippschalter ohne Knopf 5 x UM toggle switch without button commutateur a bascule. sans bouton
S 305 339440011 Kippschalter ohne Knopf 3 U toggle switch without button commutateur a bascule. sans bouton
T 301. 1301 309001211 Transistor BC 550 B Transistor BC 550 B Transistor BC 550 B
T 302. 1302 309001242 Transistor BC 550 C Transistor BC 550 C Transistor BC 550 C
20 309653501 Sicherungshalter fuse holder pone-fusible
21 339870006 Diodenhalter. 2-fach diode holder. 2 fold support de diode. double
22 339566062 Lampenhalter bulb holder support dampoule
23 339870007 Schalterschiene switch rail rail commutateur
16 349355024 High Com Bausteln High Corn Module Module High-Com
C1 309411703 AL C2 309410634 AL~EIko 4.7 "F. 35V AL-Elko 4.7 pF.35V AL-Elko 4.7 uF.35V
C8.11 18 309412644 AL-Elko 47 pF 16V AL-Elko 47 uF16V AL«E|ko47 p.F 16V
C 15 309410655 AL-Elko 2.2 pF 25 V AL-Eiko 2.2 pF 25 V AL-Elko 2.2 AF 25 V
C17. 20 309411647 AL-Elko 10 pF 16V AL-Elko 10 pF 16V AL-Elko10uF16V
C22 309413486 AL-Elko 100 F 16V AL-Elko 100 MF16V AL-Elko 100 pF16V
IC1 339575019 IC~U 401 B. High com IC-U 401 B. High com lC-U 401 B. High com
Fl 20 339510047 Trimmwiderstand 1 M ohm variable resistor resistance variable
17 339 335 007 LED-Aussteuerung-Anzeige. vollst. LED Indicator, cpl. instrument LED
D 701. 703-710 309327031 Leuchtdiode CQY 85 it luminescent diode diode lumineuse
D 702 339529149 Leuchtdiode CQY 86 gn luminescent diode diode lumineuse
10 701 309368 238 IO U 247 B IO U 247 8 IO U 247 B
IC 702 309368239 IO U 237 B IO U 237 B lC U 237 B
309900292 Diodenhalter. 12-fach diode holder support de diode
18 339 420 006 Buchsenplatte, vollst. sockets plate plaque de prises
BU 101 309672909 NF-Buchse 5 pol. AF socket 5 poles prise BF :1 5 péles
BU 102-104 309672 801 Buchse 5 pol. socket 5 poles prise a 5 poles
BU 105-108 309679 503 Cinschbuchse cinch socket prise cinch
1105-1108
S 102 339440006 Druckschalter push switch interrupteur poussoir

Anderungen vorbehalten
Subject to modifications
Modifications reserves

UV 83 , 8004

Printed in the Federal Republic of Germany

TELEFUNKEN

Fernseh und Rundfunk GmbH
Dokumentation

TillystraBe 25

3000 Hannover 91

W. GERMANY