I have Thomas Pacconi 3-speed phonograph model TPC-7475 and wanted to attach external bookshelf speakers. Is there any way to hook speakers up to the line out jacks?

The CD drive can't read the disc so rejects it.

This is very common as unfortunately the quality of the CD player means they rarely last as long as the the rest of the unit. Sometimes it is just dust on the laser lens and being at the bottom of the unit they will collect any dust that falls from above and the lens isn't easy to clean.

If you load a CD and hear it beginning to spin and the onscreen message indicates it is trying to read the disc but eventually fails and stops - it is probably either dust or a poor laser.
Both are a dismantling job and a replacement laser requires a professional - consequently people tend to consign them to garage sales and move onto the next hifi.

https://www.turntableneedles.com/find10.asp?manfg=THOMAS%20PACCONI&modelname=TPC-MSE-805&Select=Model
Try these guys

Check the connections to the cartridge. The earth lead might be off.

What you do is look at the cartridge it fits in, then note down the make and model number and enter that into Google. The stylus should then show up.

could you include a picture of the under side of the turn table where the belt is fitted?

All you need do is look at the cartridge it fits in. There should be a maker name and model number on it. Put that into Google and you should find it - plus the stylus.

I have the same unit. Where do you find the screws that hold the cd clamp cover?

These people may help you.
www.turntable-power-supply.com

My older Thomas Pacconi turntable was also turning too slowly. Rather than replacing the belt or needle, I tried using an eye glass repair screwdriver to alter the trimmers inside the motor. But the changes didn't take. Then I tried trimming the power to the motor using the larger trimpot next to the motor with the motor itself set to the 78 rpm setting. But the adjustments to the trimmer didn't get the platter to spin slow enough - it wouldn't play an LP. To get the speed down further I replaced the 1K trimmer with a 10K trimmer I picked up for a buck at Radio Shack and successfully adjusted the turntable down to down to 33 1/3 rpm usage. All that was needed was a soldering iron and a 10K trimpot to get the job done.