changed lens nd disc dun spin

[timomaas]

Anyone has any idea why my version 7 dun spin the disc anymore??
the version 7 is using a R type lens which is lens without cover
i try replacing a new lens of the same type now it spins weakly then stop
i check my BA chip ,its still alive so what might be the problem??
what might be the problem??
thanks for any help

[Emanuel]

Probably a partially burned BA5815FM chip. You can't test it, because only one channel may be dead or some of its parameters have altered. If your old laser has at least one of the lens coils with a resistance less than 5 ohms, it means that the BA chip is burned too and you must replace it also.

[timomaas]

does that means i have to replace the BA chip???
how can i be sure tat it is the BA chip??
regarding the lens coil do you mean the dvd and cd pots??
thanks

[Emanuel]

Explanations in the attached picture (it's a B laser, but it should be the same with your R laser too).

[timomaas]

thanks emanuel but urs is normal lens without the cover
mine is a R type set lens implying those eg, 30001R sets
the lens is already without cover so it is quite troublesome as i had no experience dealing with such lens
and regarding the lens coil , what should be the normal working value??
and how the values will affect the lens and set??
thanks very much for any help

[Emanuel]

The coils should have a resistance of about 5 ohms. If they are burnt, their resistance will be in the range 1.5-3 ohms. That means that the BA5815 sources more current through the coils and eventually the BA burns partially (some of its parameters change).

[timomaas]

i had measure the coils the value keep fluctuating there is no constant value did i measure correctly??
thanx

[Emanuel]

The value should be stable. Short your probes and see if it gives you 0 ohms. If it is still fluctuating, then you have a loose wire or a bad contact at your measuring equipment. It is also possible that you don't make a good contact between the probes and the coil contacts.

[timomaas]

after i change the BA chip everything works well except some disc which cnanot be read by the laser
so i decided to tune the value of the dvd pot now everything goes haywire how do u determine if the dvd drive is dead??
currently my drive cannot read anything can it gives me a clicking sound when i press the reset button

thanks for any help

[Emanuel]

Put the DVD pot in the original position. It should show around 1100 ohms. Also, if you played with the parallax and with the white cog adjustments, you should put them in the original position also.
The parallax (the small screw) is very sensitive.