Magnavox AZ6843 - Portable Cd-player Manual de usuario descargar pdf

Audio Restoration Project – Repair Philips Magnavox Marantz CD650

CDB650 CD Player Modification

This applies to all similar type models using the Philips CDM-2 and CDM-4 transport, commonly

combined with the TDA1541 / TDA1541A DAC. These are found in B&O's BeoGram CDX2 , CD3300 ,

CD3500 , CD4500 , CD5500 , CD6500 , CD7000 , BeoCenter 8000 , 8500 , 9000 , 9300 , and 9500 , and

selected models from Acoustic Research , Arcam , Cambridge Audio , Grundig , McIntosh , Mission ,

Naim , Rotel , SAE , Sherwood , Tandberg , and Tesla.

Time has proven that this combination of Philips DAC and Transport is probably the most long-

lasting and mechanically robust ever made, and combined with its superb audio fidelity, it naturally

lends itself to modification, in order to extract every last nuance of exceptional sound reproduction.

Correctly restored and modified, the sound quality is superb, and it puts many other CD players,

irrespective of their age, to shame.

This unit came onto my lab-bench after showing symptoms of random blackouts on the front-panel,

skipping tracks, and difficulty in extending the CD-tray. Track-skipping is indicative of a failing laser

– simple enough, but the cause of the random blackouts proved tough to nail down.

1. Clean and reassemble the CD-tray mechanism

On the CD-tray, I have had similar problems many times before, and it is simply a matter of

completely disassembling all the plastic toothed gears from the CD-tray, cleaning off the hardened

grease, spraying with Silicone spray (I do not use grease on plastic parts) , and reassembling. The

Service Manual is very clear about the assembly sequence.

Thereafter, I cleaned the V-ridge on the plastic wheel with alcohol, and replaced the rubber belt – I like

to use a thicker (1,8mm) belt than the original 1.2mm square profile.

2. Replace the Wiring Harnesses with Litz wire

The cause of the random blackouts was traced to the Stocko OEM connectors, whose pincers grip the

single-strand copper wire in a knife-cutting action, and over time, the wire simply disconnected from

the pincer, destroying the connection.

These are the original grey single-strand wires, in the Stocko connectors

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Magnavox AZ6843 - Portable Cd-player Manual de usuario