On startup my 4002 does not stop at the beginning of the LP and lower the arm.

My arm lowers (only when it detects a record) manually.

How does the TT know when to stop?

There is a photoresistor sensor, which senses absence or presence of light transmitted by a lamp (or on later versions, an LED), through a slide ruler with vertical black bars.

My best guess is that either the lamp has blown, or there is a problem in that circuit.

If the lamp has blown, this is an excellent opportunity to make the necessary circuit mod to replace it with an LED, which will last a lifetime.

Download my PDF here, and check Section 7.

Yes its the lamp for the photoresistor.

What is the Part# for the lamp and photoresistor on the schematic?

I should replace all the lamps with white LEDs.

Thanks!

For some reason the 45rpm lamp switched on when I started the 4002 in 33rpm mode.

I suspect bad capacitors but which ones to replace?

Any other ideas?

A short answer - all of them.

If you want to do a proper job, get a capacitor kit from Martin Olsen (Dillen).

Replacing the lamps is simple in terms of parts - 2 x 5mm White LED's - about 20,000 - 50,000mcd,  and 2 x 1kOhm 1-Watt resistors.

But a bit more complicated in terms of the work involved - if you're not accomplished in soldering techniques, best to have a competent tech take care of it.

Menahem

I have no problems soldering capacitors and LEDs, but how do you remove the PC boards?

The main PCB is held by 4 screws. Don't unsolder all the connecting cables, just flip it over partially to get access to the component side while you're soldering.

The other PCB's are also held to the chassis by screws.