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fra	21st October 2012 02:08 PM

dls cad 11

Could you please help me with this amplifier. Green light turns on but no sound. Inside everything looks ok. Supply is. But the amplifier not oscillate.
Does anyone have a scheme?
Sorry for my bad English

timwebb

21st October 2012 03:10 PM

u have a picture of the board?

fra	21st October 2012 05:29 PM

4 Attachment(s)

hey these are pictures.

Perry Babin

21st October 2012 06:11 PM

Q124 and Q125 are the most common components to fail on this type of amplifier (used by many 'manufacturers').

fra	21st October 2012 07:21 PM

Q124 and Q125 are ok.
what is U100?

Perry Babin

21st October 2012 10:39 PM

Did you check for leakage as well as open junctions?

U100 has varied but is most commonly an NJM4580 in the newer amps.

fra	31st October 2012 06:56 PM

hey what value is r174 near zd 114 (5.6v)?
thenks

rrae	31st October 2012 08:21 PM

10k

fra	31st October 2012 08:40 PM

Now is working. The problem was R174.
Thanks

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