11-02-2014, 10:34 PM
(This post was last modified: 12-02-2014, 09:15 AM by Old Sparky.)
I've now received the service manual, which does give instructions on how to adjust the record deck. The pickup height is adjusted via a screw in the top of the Arm, in front of the counterweight so that the sylus tip is 3mm above the record surface at the lead-in groove of a 12" LP, whilst the tracking weight is set, after balancing the arm, to 1.4g. In practice I've had to set the height at ca 4mm otherwise the stylus tip scrapes across the disc as noted above. There is still the speed issue of the motor running at 45rpm when 33 is selected. A 3v DC Motor, servo controlled, is used, with the usual switched pre-set pots, one for each speed, sofinding the cause of the fault shouldn't be too difficult (famous last words!!)
Incidentally, when the stylus wears out, the complete cartridge/stylus assembly has to be replaced. On Musonic's website they are asking a whopping £375.00 for a new one, and it would appear to be impossible to fit anything else. Fortunately the stylus on the 4600 I'm repairing is in good condition!
Incidentally, when the stylus wears out, the complete cartridge/stylus assembly has to be replaced. On Musonic's website they are asking a whopping £375.00 for a new one, and it would appear to be impossible to fit anything else. Fortunately the stylus on the 4600 I'm repairing is in good condition!
