Hi @julomariston
Without a cassette inserted and when Play is pressed are both the drive wheel and the take up wheel turning?
If they are then it may be a dirty capstan and/or pinch roller.
If the take up wheel is not turning or not very well it may be a stretched or broken drive belt.
Here's the [https://elektrotanya.com/sony_hcd-gr8_hcd-rx90_ver1.1_sm.pdf/download.html|service manual] that may help.
It shows the disassembly procedure so that you can clean the capstan and pinch roller (use Isopropyl Alcohol 99%+ and a Q-Tip) and to check the belts are OK.
If the belts are faulty and need to be replaced, the belt part numbers are on p.102. Search online for the ''part number(s) only'' to find suppliers that suit you best.