I happen to complete the recap of this Sony WM DD11. Sound seems to be restored to back to its original loudness levels. But the sound in right channel is very faint and low at full setting. Can anyone please suggest possible fixes for this low sound?. I have attached a picture of the board before cap replacement.
Sound on R is faint and low only at full setting, but fine otherwise ? If so would measure the potentiometer resistance during a full rotation. The pot has 10kΩ, so you should see the resistance varying between ~10kΩ at minimum setting and 10-20Ω at maximum setting.
Hi @Valentin the sound in R is low at all settings. Should I check for any resistors specifically to right channel sound?.
Does the volume level vary (even a tiny bit) on R channel with different settings of the potentiometer ?
Hi @Valentin , yes the volume does vary about 20% at from 0-10 steps setting. However the total audio volume level output at 1oth step is 20%. I checked this with and without cassette inserted in play mode. *Wish you a great new year friend!
No need to mention me and say Hi at every post. Keep in mind this is a public forum, not a discussion between you and me. Also no need to quote previous messages. Instead of using the "Reply" button (which quotes automatically), you can type in the box below and press "Post Reply". What I would check (assuming you don't have means to measure the signal at different points) are the following: - head connection and if the head itself is clean; - solder joints on the new capacitors; - damaged traces or vias near new capacitors (potentially affected by leakeage); - volume potentiometer resistance at max setting (see post #2); - headphone jack (both soldering and clean it);
@Valentin I recently acquired a basic Oscilloscope to troubleshoot the sound issue in Aiwa PC202 MKII in other thread that we are discussing. Because I'm new to using oscilloscope I thought about trying my first attempt here with this DD11 device long pending to get fixed. I soldered both left and right head tape signal channels with DDS + cable with sine wave signal ON and its negative to the ground on walkman board. Using the X1 probe via DSO plug connection I was able to trace the signal completely at 1MHz 50mV for left audio signal path upto the earphones jack. But for right channel I did not get any output at point 13 of the Pre Amp chip with walkman powered ON. I'm assuming its a chip problem or maybe something else I completely missed. Incase the chip is bad, any ideas which other sony models would have this similar chip to swap?.
Before drawing the conclusion the chip is bad, I would check around C204: traces, pads, vias. Check if you have continuity between + of C204 and pin 14 and between R201 and - of capacitor. Besides what you state in post #7 doesn't correspond with initial statement of low sound. You state here you have no signal at all. The LA4570 is also used in WM-F35, WM-F45, WM-32, WM-33, WM-43, WM-3060 and possibly others.
@Valentin Initially I had very low sound when I recapped it. But because of low sound, I again removed all caps just to double check and installed again but after this there's NO sound in right channel. I checked and got continuity across these paths.
I had also removed the resistors C203, R203, C201, R201, R202 to clean the electrolyte liquid. While reinstalling them I may have not checked for their polarity/orientation. I'm not sure if this change in orientation will impact the NO sound issue in right channel.
