Magnavox CDB472 User Manual Download

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Summary of Contents for CDB472

Page 1: ...NTENTS Explanation of subdivision and table of contents per page 2 Controls and technical specifications 3 Servicing hints 4 Measurements and adjustments 5 Exploded vieuws and parts lists of mechanica...

Page 2: ...panel Servicing of tray mechanism Disassembly of CDM Servicing of servo decoder panel Replacement of transformer fuse Electrical measurements and adjustments General checkpoints General checkpoints De...

Page 3: ...452 0 2 9 TRACK TIME key for switching from track number to playing time indication and vice versa 10 PROGRAM key for storing the track numbers of a programme and producing the display of the programm...

Page 4: ...rx screwdrivers 4822 397 30096 4822 395 50145 4822 395 50132 4822 395 30204 4822 321 21284 4822 322 40066 4822 267 50676 5322 130 32182 Set straight Set square 13th order filter Service cable 4 pole S...

Page 5: ...rest properly on the turntable To achieve this a disc hold down has been mounted in the cover Remark The service cable should be assembled as follows see drawing MDA 00311 When the cover has to be ta...

Page 6: ...to the set Two screws are situated in front and one in the centre at the rear Lift the tray mechanism a little and undo the flexible PCB from the connector by lifting the upper part of the connector a...

Page 7: ...y voltage T he injected levels or signals Shol lld never be greater than the supply voltage of the r elated circuit 4 1 GENERAL CHECKPOINTS In the detalled measuring method below a number of general c...

Page 8: ...rning the mains switch POWER ON OFF off and on again Hardware reset CS 11 950 1GB Specification measurement CO PLAYER 1 FILTER t R Fig 4 VN AND DISTORTION METER G SOUNC TECl NOLOGV ST 1700B 30 59 A12...

Page 9: ...utton again Here after the fine adjustment of the laser current has to be carried out Fine adjustment Play track 1 of the test disc 5 Adjust potentiometer for a voltage across 3508 test point 1 and 2...

Page 10: ...952 GB SI pin 20 test point 21 LO pin 17 test point 9 9 98 With the Si signal Start Initialization the laser supply among other things is switched on When the Si signal is low the LO signal Laser Out...

Page 11: ...es information on the level of the HF signal to the high frequency Level Drop out detector IC6525 When the level of the HF signal is too low the HFD signt J High Frequency Detector will go ttlowtt The...

Page 12: ...is high however minor pulses may be present and in case of disorders on the disc During playback of track no 15 of test disc 5A HFD pulses are visible Position of the oscilloscope 5 ms div H F D M JA...

Page 13: ...bcode Data from Decoder A to Fllter B and their interrelations 4 7 Note While the burst of 10 clock pulses appear on SCAB the a channel information Is transferred on SDAB Hereafter the P bit indicatio...

Page 14: ...s between Fllter B IC and DACIC Check the output of the OP AMP after the DAC IC Place a disc on the turntable In position PLAY or in SERVICE POSITION 3 position PLAY the analog music signal should be...

Page 15: ...this will lead to Er 07 Error during PLAY Er 08 TOC error Table of Contents Check the quality of the disc used Check the initial speed of the turntable motor and the motor control Check also that the...

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Page 22: ...803 3513 803 3518 802 2622 E03 2627 F03 2632 CO2 2641 002 2646 F02 2651 F02 3502 COi 509 A04 3514 B04 3519 ADJ 3520 A03 3525 A03 3530 B04 3539 A04 3544 A04 3550 A02 3556 C04 3562 C04 3568 E04 3585 00...

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Page 24: ...E0 I 3508 8 3 3513 803 3518 802 2622 E03 2627 F03 2632 CO2 2641 D02 2646 F02 2651 F02 3502 COi 3509 A04 3514 JI04 519 A03 3520 A03 3525 A03 3530 804 35 39 A04 3544 A04 3550 A02 3556 C04 3562 C04 3568...

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Page 28: ...822 209 83203 u TY40408 4822 209 71579 UPD41416C 20 4822 209 50582 4822 122 40327 UPMC68HC05C4 SC93486 4822 209 72236 2501 MM58348 4822 209 72122 2567 4822 124 22341 2651 2655 4822 124 22339 DISPLAY B...

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