Hi, everyone, and greetings from Europe. I am new to the forum so please bear with me 
At the moment I am working on a DCC450 which has a cassette drawer stuck (message NO CASSETTE or CASSETTE BLOCKED.)
After repairing a badly damaged power section (cracked PBC which involved some re-building) I powered it up and the drawer was opening and closing fine. Until I inserted a cassette and, boom, the drawer got stuck. Opened it manually now it would not operate at all.
When pressing open/close there’s no response from the motor. With the cassette inside I can hear a faint noise, a few turn of the motor and then error message. The belts are OK.
On this unit I run TRAY and HOLE TEST in service mode. While the first gives me TRAY ERROR, the HOLE TEST remains stuck on message HOLE 1 OK and when I try to manually press other switches the message does not change, my guess was that it was maybe dirty/blocked therefore I took it apart checked it, cleaned it a bit and put it back together (what a pain!) but unfortunately no change. Message HOLE 1 OK’s still there. I will move on to check the 2 tray switches and let you know.
In the meantime any further advice is welcome.
Stay Home, stay Safe,
Greetings, Max
