This manual is very useful because it presents the technical specifications of the cd player, including the manufacturer of the reader, this helps if you need to replace it. It also displays the settings and layout of the circuit.
Manual was a good representation of service infomation for the EWV404. It worked well for my repair.
Text excerpt from page 24 (click to view)
3. Y/C CIRCUIT (3) No sound in REC Mode,
No sound in REC Mode, YES Sound is not recorded. YES Is Playback O.K.? YES Is the Audio signal applied to the IC301 Pin 8? YES Does the Audio waveform appear at the IC301 Pin 4 ? YES Is 5V applied to the FL301 Pin 2 ? YES NO Check the line of the 5V Power Circuit. NO Is the âHighâ signal applied to the IC301 Pin 99? YES Check the IC501 Pin 62 (Audio Mute âHâ). NO Check the CLK/Date line and replace the IC301 NO Check the path of Line Audio. NO Refer to âNo sound in PB Mode,â.
Is 3.0~4.5V applied to the Collector of the Q301 ? YES NO
Does the Erase signal appear at the FL301 Pin 5? NO