Wish you all happy new year 2023.
Since 2010 I member this forum, I know there is lot of electronic experts will help short out my problem.
I bought used Beo Sound 9000 Mk3 (Type 2572) along with Beo Lab 8000 3 months ago, after 3 months used, I have problem with CD audio output. When I loaded CD's and pressed play button CD start playing time count runs till 1 to 3 minutes there is no sound in both L&R speakers, and then I can hear songs missing some lines. I had tried to isolate speakers, and directly connect headphone to CD player and listening during CD playing, same problem in headphone 1 to 2 min no sounds both L&R channels. This CD player have Digital output (coaxial) I connect to my headphone DAC play CD's I can hear songs immediately once CD start playing! This Beo Sound having FM & Aux input those all working fine, I mean when changed input I hear sound once pressed input button.
I have some experience repairing CD player and amplifiers, also Beo Sound 9000 service manual available out there. Based on my troubleshooting, the problem may be in PCB32 Input/output select & Digital/analog decoder board. I have enclosed manual and schematic for your ready reference. All electronics components are SMDs.
I was suspect PCB32 mute circuit problem there are Aux mute/ Power link Mute (delaying sound issue) /headphone mute (delaying sounds issues) /Master Link Mute.
I had checked power link mute transistors 2SC4213 as per schematic location PCB32 RH channel TR21/22 - LH channel TR23/24 find good no abnormalities. Also check headphone mute transistors 2SC4213 location TR15/16/17/18 found good no abnormalities. Measured resister value around transistors found within values.
Digital/Analog Decoder circuit location IC1 & 2 HEF4094BT pin 6 (Power link Mute) connected TR601 - PUMT1 & R608/R609/610 all found normal. Now I have suspect only IC2 - HEF4094BT?
a. Suspect mute transistors (2SC4213) used LH & RH separate as well as headphone mute, I have problem in both channels delaying sounds
b. Suspect power supply, same PCB board using for FM & Aux no issues in sounds
Please I need expert helps, there will be problem in IC - HEF4094BT? Rajkumar
Since 2010 I member this forum, I know there is lot of electronic experts will help short out my problem.
I bought used Beo Sound 9000 Mk3 (Type 2572) along with Beo Lab 8000 3 months ago, after 3 months used, I have problem with CD audio output. When I loaded CD's and pressed play button CD start playing time count runs till 1 to 3 minutes there is no sound in both L&R speakers, and then I can hear songs missing some lines. I had tried to isolate speakers, and directly connect headphone to CD player and listening during CD playing, same problem in headphone 1 to 2 min no sounds both L&R channels. This CD player have Digital output (coaxial) I connect to my headphone DAC play CD's I can hear songs immediately once CD start playing! This Beo Sound having FM & Aux input those all working fine, I mean when changed input I hear sound once pressed input button.
I have some experience repairing CD player and amplifiers, also Beo Sound 9000 service manual available out there. Based on my troubleshooting, the problem may be in PCB32 Input/output select & Digital/analog decoder board. I have enclosed manual and schematic for your ready reference. All electronics components are SMDs.
I was suspect PCB32 mute circuit problem there are Aux mute/ Power link Mute (delaying sound issue) /headphone mute (delaying sounds issues) /Master Link Mute.
I had checked power link mute transistors 2SC4213 as per schematic location PCB32 RH channel TR21/22 - LH channel TR23/24 find good no abnormalities. Also check headphone mute transistors 2SC4213 location TR15/16/17/18 found good no abnormalities. Measured resister value around transistors found within values.
Digital/Analog Decoder circuit location IC1 & 2 HEF4094BT pin 6 (Power link Mute) connected TR601 - PUMT1 & R608/R609/610 all found normal. Now I have suspect only IC2 - HEF4094BT?
a. Suspect mute transistors (2SC4213) used LH & RH separate as well as headphone mute, I have problem in both channels delaying sounds
b. Suspect power supply, same PCB board using for FM & Aux no issues in sounds
Please I need expert helps, there will be problem in IC - HEF4094BT? Rajkumar
Time delay may be leaky electrolytic, B & O used cheap ones at times.
Just change ALL of the non-reputed electrolytic capacitors, spray switches if any.
Just change ALL of the non-reputed electrolytic capacitors, spray switches if any.
Hi Naresh thanks, this BS9000 Mk3 last new version (2010) all SMD parts, very few 5nos electrolytic caps but used in amplifier section, however I will check those caps and update. I have enclosed PCB32 picture
Attachments
Those white metal can capacitors are solid electrolyte type. Change to Keltron, or whatever good ones you can find, just as a precaution.
Update problem has been solved:
Symptoms:
Symptoms:
- During CD play sound came out L&R speakers delayed 1 to 3 min (headphone as well same) at the same time digital out can heard sound immediately once CD started readings.
- During playing CD intermittently sounds distorted.
