TC-252 is 3-speed reel to reel player manufactured by Sony in around 1970 – 1972. This is transistor based tape player with 4W × 2 audio output power, sound-on-sound, and sound-with-sound recording features. The TC-252 which we got to restore had many problems. The major problem is someone alters the circuit in that recorder and attach LA4440 power amplifier into the circuit. Apart from that, the motor speed of that recorder also starts to decrease after 10min of continues playback. Other than above two major problems it had some mechanical problems in playback position and all the potentiometers in the front panel are damaged beyond repair. TC-252 main PCB after restoration. As a first step of the restoration, we remove the LA4440 module attached into that recorder and rewire the player with original wiring layouts. After rewiring we check all the transistors in that player and find out that the couple of 2SC634 transistors are damaged in that player. Because 2SC634 is not a...
This blog contains electronic, amateur radio, and embedded system projects, which I did during my free time. Unless otherwise noted, all the articles and projects described on this blog are based on my original designs.