PTL-Pioneer
Super Member
2SD313 is replaced by MJE15032G
2SC945 is replaced by KSC945
Open to correction as always.
2SC945 is replaced by KSC945
Open to correction as always.
Akai AA-1150 Clicking noise
- Thread starter rotco
- Start date
@petehall347
For some reason i suspect mostly in the right channel in which i replaced the outputs, since when i worked only with one channel, the relay dodnt make clicking noises and worked great for half an hour.
Before i start digg inside and look in the protection circuit, maybe if i will dismantle the left channel again, and if the clicking noises will stop again, then i will know for certain that is something within the left channel?
Or maybe this test ia not good enough?
For some reason i suspect mostly in the right channel in which i replaced the outputs, since when i worked only with one channel, the relay dodnt make clicking noises and worked great for half an hour.
Before i start digg inside and look in the protection circuit, maybe if i will dismantle the left channel again, and if the clicking noises will stop again, then i will know for certain that is something within the left channel?
Or maybe this test ia not good enough?
petehall347
the brandy coffee man
so long as its running off full mains .
petehall347
the brandy coffee man
no i meant without dbt
Ohhh sorry!
Makes much more sence now.
Yes, last time running half hour without dbt with only right channel outputs.
After replacing new transistors in right channel, and later, set biad current for both channels.
Then run full mains for another 6 hours.
I felt sure enough to bring it back to my friend (owner)
He said thanks it work perfect now.
And after 1.5 hours he said clicking noises come back :/
update regarding the shorted AA-1135
during first assesment i found that in both output transistors (2sd587 NPN) collectors are shorted with ground.
i dissatach them from the circuit, and still the unit is short.
next i suspect the diode bridge, and found that one of the diodes is shorted.
took it off the circuit, and the unit turned ON.
now is the question.
should i replace only this one?
maybe a pair?
or all the four?
the diode is GP20G (400V, 2A)
Thanks!
during first assesment i found that in both output transistors (2sd587 NPN) collectors are shorted with ground.
i dissatach them from the circuit, and still the unit is short.
next i suspect the diode bridge, and found that one of the diodes is shorted.
took it off the circuit, and the unit turned ON.
now is the question.
should i replace only this one?
maybe a pair?
or all the four?
the diode is GP20G (400V, 2A)
Thanks!
Last edited:
petehall347
the brandy coffee man
best all 4
Hi all,
i needed to change the outputs in the AA-1135.
i ordered MJE15033G+MJE15032G
and instead of MJE15032G the seller gave me MJE13009G (as a complementary of the MJE15033G)
he said is the same.
iv'e looked the datasheet...but i'm not sure if it's really good option to use.
can you advice please?
thanks
i needed to change the outputs in the AA-1135.
i ordered MJE15033G+MJE15032G
and instead of MJE15032G the seller gave me MJE13009G (as a complementary of the MJE15033G)
he said is the same.
iv'e looked the datasheet...but i'm not sure if it's really good option to use.
can you advice please?
thanks
petehall347
the brandy coffee man
petehall347
the brandy coffee man
petehall347
the brandy coffee man
and this is what you should get .
I found the data sheet.
But my knowledge is not sufficient to choose. Can you tell?
I guess it will work. But i want it to fit and perform at least the same if i use 15032.
Thanks
Its a local store
He told me i dont have the 15032 so i gave you this.
"Thrust me, it will work"
I didnt like it at all... But thats what ive got.. ;/
petehall347
the brandy coffee man
data sheet says its not really suitable .
Hi,
I still with 4 output transistors out of circuit.
after turning ON with DBT for test after replacing 4 diodes rectifier the receiver turned ON with no short anymore (Bulb dimmed low).
after feeling safe to remove the DBT, i turned ON the receiver, and i heard low noise of vibrations.
i think it's a vibration noise like the sound while transformer is "charging".
(the unit is ON, relay is clicked IN, so no short... but this noise was strange for me).
i started measuring voltages out of the transformer, and found they are correct according to s/m.
next i measured voltages of big filter capacitors, and found they are about -34vdc/+35vdc.
BUT, i also find that in the positive (orange) exists also about 35VAC in addition to the +35vdc.
whereas on the negative (purple) exists only the -34vdc without any AC.
is in pointing of issue with the rectifying circuit? (or maybe one of the big filter cap? since i install now 4 new diodes).
thanks.
I still with 4 output transistors out of circuit.
after turning ON with DBT for test after replacing 4 diodes rectifier the receiver turned ON with no short anymore (Bulb dimmed low).
after feeling safe to remove the DBT, i turned ON the receiver, and i heard low noise of vibrations.
i think it's a vibration noise like the sound while transformer is "charging".
(the unit is ON, relay is clicked IN, so no short... but this noise was strange for me).
i started measuring voltages out of the transformer, and found they are correct according to s/m.
next i measured voltages of big filter capacitors, and found they are about -34vdc/+35vdc.
BUT, i also find that in the positive (orange) exists also about 35VAC in addition to the +35vdc.
whereas on the negative (purple) exists only the -34vdc without any AC.
is in pointing of issue with the rectifying circuit? (or maybe one of the big filter cap? since i install now 4 new diodes).
thanks.
petehall347
the brandy coffee man
yes it looks like cap might be open circuit .
petehall347
the brandy coffee man
the capacitors should filter out the AC content .
petehall347
the brandy coffee man
just in case its an error with your meter try swapping probes over when checking AC volts .
