Rotel RA 1412 Service Manual

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CHASSIS mom (TOP View 77: ........... T 2 SEAN 5.22222 TTTT ........................................... 11 "
CHASSIS LAYOUT (BOTTOM VIEW) ............................................. 3 CAUTION IMIIV-lgMCSRTFIFDNQDURI-MG REPAIRS ............... 12
CHASSIS LAYOUT (SIDE VIEWS) . $4 -SCHEMATIC DIAGRAM (I) - .............................. 13
2.222232% 02 um .............. i .................... 5 222mm 0742212. (2) Q.If:1::127. .................. 16
PRECAUTION ....................................................................................... 8 PRE-AMPLIFIER CIRCUIT BOARD DIAGRAM ........................... 19
POWER AMPLIFIER ADJUSTMENT PROCEDURE PHONO AMPLIFIER CIRCUIT BOARD DIAGRAM ..................... 21

1. DC BALANCE ADJUSTMENT ............................................. 8 MAIN AMPLIFIER CIRCUIT BOARD DIAGR-AM ........................ 23

2. BIAS ADJUSTMENT .......................................... i fivw'av fl JDLUME CONTROL CIRCUIT BOARD DIAGRAM ..................... 23

3. OVERLOAD PROTECTION LEVEL ADJUSTMENT ......... 9 POWER SUPPLT CIRCUIT BSARDSIDIAGFTAM- ..................... 24-

4. WATTS METER ADJUSTMENT ......................... ................... 9 OVER LOAD CIRCUIT BOARD DIAGRAM-_- ...... 25-
OVERLOAD PROTECTOR ............................................................... 9 REPAIR PARTS LIST ........................ ........ - ....................................... 26
TROUBLE SHOOTING GUIDE ......................................................... 11

:TECHNICAL MANUAL:

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CHASSIS LAYOUT
(TOP VIEW)

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1. C004, SMOOTHING CAPACITOR, R-ch. 14. 0001 , POWER AMP., L-ch.
2. T002, POWER TRANSFORMER, R-ch. 15. POWER AMP. BIAS ADJ., L-ch.
3. BALANCE CONTROL. 16. 0003 , POWER AMP., L-ch.
4. VOLUME CONTROL. 17. 0001 , VARISTOR
5. VOLUME CONTROL CIRCUIT BOARD. 18. R-ch. MAIN AMP. CIRCUIT BOARD.
6. M002, WATTS METER, R-ch. 19. 0005 , POWER AMP., R-ch.
7. M001 , WATTS METER, L-ch. 20. 0007 , POWER AMP., R-ch.
8. T001, POWER TRANSFORMER, L-ch. 21. R-ch. OVER LOAD LEVEL ADJ.
9. POWER SWITCH. 22. 0002 , VARISTOR.
10. C002, SMOOTHING CAPACITOR, L-ch. 23. R-ch. POWER AMP. BIAS ADJ.
11. C001, SMOOTHING CAPACITOR, L-ch. 24. C003, SMOOTHING CAPACITOR, R-ch.
12. L-ch. OVERLOAO LEVEL ADJ.

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L-ch. MAIN AMP. CIRCUIT BOARD.