Rotel RX 1203 Service Manual

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Quality mimmpmmm

DTEL

Technical
Manual

AM/ FM STEREO RECEIVER

RX-lZO?

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TABLE OF CONTENTS
Chassis Layout (Top View) ..................... 2 Addendum .............................. 20
Chassis Layout (Botmm View) ................... 3 Schematic Diagram ......................... 21
Power Amp Adjustment ....................... 4 Power Supply & Overload Protection Circuit
AM Alignment Procedure ..... . . . . Board Diagram ......................... 29
FM IF. RF 5 MPX Alignment ------------------- 10 Phono Amplifier Circuit Board Diagram ............. 29
Gain Diagram ---------------------------- 14 Speaker Selector Circuit Board Diagram ............. 30
Troubleshooting Guide ...... AM & FM lF Amplifier Circuit Board Diagram ......... 31
R993" Parts USt -------------------------- 15 Main Amplifier Circuit Board Diagram .............. 33
Dial Stringing Diagram ----------------------- 18 MPX & Tone Control Amplifier Circuit Board Diagram . . . . 34
Front End Schematic Diagram .................. 19

INHALTSVERZEICHNIS
Chassis-AnordnUng (Oberansicht) .................. 2 Nachtrag ............................... 20
Chassis-Anordnung (Unteransicht) ....... 3 Schaltungsschema .......................... 21
Einstellung des Hauptverstérkers .................. 4 Schaltbild des Netzzeils und
AM-Abgleich ....... ~ ....................... 8 Uberlastungsschutz-Schaltung ................. 29
UKW-ZF», HF- und MPX-Abgleich .............. 10 Schaltbild des Phonoverstérkers .................. 29
Verstérkungsdiagramm ............. . i . i , 14 Schaltblld des Lautsprecherwéhlers. V . . . . .
Leitfaden zur Stérungssuche .................. 15 Schaltbild des MW/UKW-ZFvVersta'rkers ......
Reparatuneilliste .......................... 16 Schaltbild des Hauptverstérkers .................. 33
Skalenantriebsschema ....................... 18 Schaltbild des MPX- und Klangregelverstérkers ......... 34
Eingangsstufe-Schalrungsschema ................. 19

TABLE DES MATIEFIES
Installation du chassis (we de desus) . . . . ........ 2 Diagramme schérnathue ...................... 21
installation du chassis (we de dessousl ............... 3 Diagramme de plaquette dalimentation et
Réglage de l'amplificateur de puissance .............. 4 protection contre la surcharge ................. 29
Procedure d'alignement AM ..................... 9 Diagramme de plaquette dampli phono ............. 29
Procedure dalignement FM lF, HF et MPX ........ 11 Diagramme de plaquette d9 selecteur de haut-parleur ..... 30
Diagramme de gain ......................... 14 Diagramme de plaquene d'ampli AM et FM lF ......... 31
Guide de dépannage ........................ 15 Diagramme de plaquette de l'amplificateur de puissance . . . 33
Liste des piéces de reel-range .................... 16 Diagramme de plaquette d'arnpli MPX et correcteur
Diagramme du cable dentrainemem . . . r ........ 18 de tonalité ............................ 34
Diagramme schématique de I'étage dentrée ........... 19
Addenda ............................... 20

THE RDTEI- 30.. I-TD.

Serial No. beginning
N806421
828587

173573 DHOKAVAMA, MEGUFIO KU, roxvo 157, JAPAN

RDTEI- ELECTRDN'CS CO" LTD. 3|DSEC 5,NANK1NGE Rvo,YAIVEl,TAiWAN

HOTEL DP AMERICA. INC.

1055 SAW MlLL RIVER ROAD, ARDSLEV. N v_ 105011.15 A

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Chassis Layout (Top View)
Chassis-Anordnung (Oberansicht)
Installation du chassis (vue de dessus)

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6698869656
(9986696 68

1. L103, AM OSC COIL 23. F901, AC FUSE 8A (6.3AT for EUROPE]
2. L105, AM RF COIL 24. VR803, LACH OVER LOAD LEVEL ADJ
3. L104, AM IFT 2nd 25. 0001, L-CH POWER AMP
4. L110, FM IFT 26. VR802, L-CH MAIN AMP BIAS ADJ
5- L302. FM LOW PASS FILTER 27. F902, AC FUSE 8A (6.3AT for EUROPE)
6. L108, AM LOW PASS FILTER 28. 0005, L-CH POWER AMP
7. VR102, FM DISTORTION ADJ 29, VR801, L-CH DC BALANCE ADJ
8. MPX 84 TONE CONTROL AMP PCB 30. D912, RECTIFIER
9. 82, FM DEEMPHASIS SWITCH 31. L001, AM ANTENNA COIL
10. L114, FM DISCRIMINATOR TRANS (SecI 32. 0002, R-CH POWER AMP
11. L113, FM DISCRIMINATOR TRANS (Fri) 33. ANTENNA TERMINAL STRIP
12. VR304, FM MUTING LEVEL ADJ 34, 0006, R-CH POWER AMP
13. VR302, FM STEREO SEPARATION ADJ 35. R-CH MAIN AMP PCB
14. PROTECTION PCB 36. VR803, R-CH OVERLOAD LEVEL ADJ
15. F903, LAMP FUSE 2A 37. VRSOZ, R-CH MAIN AMP BIAS ADJ
16. VR301, FM STEREO ADJ 38. VR801, R-CH DC BALANCE ADJ
17. VR303, FM STEREO AUTO-SWITCHING ADJ 39. AM/FM FRONT END
18. C004, +B SMOOTHING CAPACITOR 40. RY901, SPEAKERS RELAY
19. T001, POWEFI TRANSFORMER 41. VR101, FM S»METER CAL
20. 0005, 78 SMOOTHING CAPACITOR 42. L102, AM |FT1st
21. POWER SUPPLY & OVERLOAD PROTECTION PCB 43. PHONO AMP PCB
22. L-CH MAIN AMP PCB 44. AM/FM IF AMP PCB