An ohmmeter will work just fine. A transistor can be thought of as 2 back to back or front to front diodes... the base is the diode common so measure lead to lead reversing the meter on each measurement. A diode test function on a DMM is even better the B - E junction will be about .6V (on my Fluke 179) positive lead to the base negative to the emitter junction will read .68V and from base to collector will read .68V as well on a new unused NPN 2N3904 transistor. A same new... PNP 2N3906 reads the same approximate voltages on "Diode" on my Fluke... negative to base and positive to collector, emitter. If you can't find the conductivity or continuity (about 450 ohms on my Fluke) then it is likely the part is a regulator. I googled it and found some russian stuff only... there it either was a MJE13003 or possibly in another post on that same site a 5V 'something'... Very possible it is a Mosfet for motor control on the CD deck, the tray and spindle motors are carefully speed controlled and that might well be the pass transistor. If the center lead is connected to the tab and you cannot find any continuity from any lead to any lead or just from the tab to either but not both it is more likely a Fet and the diode you measured was the "Body" diode or internal back emf diode... with a 5V supply and a 1K resistor it would be easy to determine what it is. as any current is limited to 5mA... Really pretty safe.
Bob