I'm fine thanks 🙂
One standout error in the measurements would be A1 pin 7 which should be at +18 volts (positive rail). Pin 8 is also incorrect which backs up a missing rail to that IC.
(Positive supply is pin 7 for all the 5534's and pin 8 for the 5532's)
You haven't said what the fault actually is and whether it is on the MC or MM input.
One standout error in the measurements would be A1 pin 7 which should be at +18 volts (positive rail). Pin 8 is also incorrect which backs up a missing rail to that IC.
(Positive supply is pin 7 for all the 5534's and pin 8 for the 5532's)
You haven't said what the fault actually is and whether it is on the MC or MM input.
im glad to here that all is well with you,
its good to here that some thing sounds bad regarding my unit ,
to be honest i purchased it as is and had a few other repairs on it to do first, some wet stuff went down the rca holes a long time ago and the plugs went very rusty and broke away for the cd and aux inputs,
i have just fixed that with some nice gold plated screw type plugs,
in fact i might do them all next week as it looks funny as is ha ha ha,
one other thing that was said to me when i picked it up was ,
the phono stage is bad, i put a signal in with some test speakers and it seemed to be down on the left channel on both mm and mc ,
the only signal i have that i think is ok is my ipod at the lowest volume,i could be wrong,
i have no other input low enough ,mm picks it up ok but only one channel this goes for the mc as well i think,
im sorry if i sound rough but im short of a turn table at the moment let alone a mc cart ha ha ha
mike
its good to here that some thing sounds bad regarding my unit ,
to be honest i purchased it as is and had a few other repairs on it to do first, some wet stuff went down the rca holes a long time ago and the plugs went very rusty and broke away for the cd and aux inputs,
i have just fixed that with some nice gold plated screw type plugs,
in fact i might do them all next week as it looks funny as is ha ha ha,
one other thing that was said to me when i picked it up was ,
the phono stage is bad, i put a signal in with some test speakers and it seemed to be down on the left channel on both mm and mc ,
the only signal i have that i think is ok is my ipod at the lowest volume,i could be wrong,
i have no other input low enough ,mm picks it up ok but only one channel this goes for the mc as well i think,
im sorry if i sound rough but im short of a turn table at the moment let alone a mc cart ha ha ha
mike
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hi there again,
i have a bag full of n5532p ic's
if i need to replace any of the op amps would this type work?
if not i guess i better start ordering a set?
mike
i have a bag full of n5532p ic's
if i need to replace any of the op amps would this type work?
if not i guess i better start ordering a set?
mike
I doubt very much an opamp is faulty...
Your readings show a missing supply on pin 7 of A1 which suggests a break in the print somewhere. Recheck those readings 🙂
The 5534 is a single opamp, the 5532 is a dual (two opamps in one package) and so they are not interchangeable.
Your readings show a missing supply on pin 7 of A1 which suggests a break in the print somewhere. Recheck those readings 🙂
The 5534 is a single opamp, the 5532 is a dual (two opamps in one package) and so they are not interchangeable.
ok ,ill check it out plus follow that track and list where it ends up and what other components are reading. do you have any idea what it could be? a cap maybe?
in every other job i have done i recap first but this time thought id see how i go,
mike
in every other job i have done i recap first but this time thought id see how i go,
mike
If your readings confirm the supply is missing on pin 7 of the NE5534 then it can only be a physical break in the connecting print. Nothing else could do that.
Pin 7 of the 5534's and pin 8 of the 5532's should read as if they are wired together... which they are. They should all connect to the positive voltage regulator output.
Pin 7 of the 5534's and pin 8 of the 5532's should read as if they are wired together... which they are. They should all connect to the positive voltage regulator output.
hi there
it would seem i wrote those readings down wrong or took readings incorrectly,i fail most the time i do things so
please forgive me wasting your time,
a1 as follows
1= 16v
2=15.4v
3=15.4v
4= -18.08v
5= -0.702v
6= -0.066v
7= 18.15v
8= 16v
i hope this makes more sense, i do try to be as good at this as i can be,
mike
No problem 🙂 lets have another look then.
So those look OK.
A really good quick check for opamps used like this is to confirm that the output pin is at close to zero volts (assuming the supplies are present 😉)
And yours now all seem to be. This means pin 6 of the 5534's and pins 1 and 6 of the 5532's should be close to zero.
So next question is what is the actual symptom you have with the phono stage and also is this when using the MM or MC input?
So those look OK.
A really good quick check for opamps used like this is to confirm that the output pin is at close to zero volts (assuming the supplies are present 😉)
And yours now all seem to be. This means pin 6 of the 5534's and pins 1 and 6 of the 5532's should be close to zero.
So next question is what is the actual symptom you have with the phono stage and also is this when using the MM or MC input?
just a thought,
around the area that the ic's are there is 2x round metal disc type components,these are the only ones on the pcb,may i ask if you know what they are,they are common to all the pics on the net,
i have not seen these before, at first i was thinking they looked like crystals in radio gear ,but they cant be, maybe a transistor?
sorry about the dumb questions
mike
around the area that the ic's are there is 2x round metal disc type components,these are the only ones on the pcb,may i ask if you know what they are,they are common to all the pics on the net,
i have not seen these before, at first i was thinking they looked like crystals in radio gear ,but they cant be, maybe a transistor?
sorry about the dumb questions
mike
i do see them in you pic ,but i made a few of my own to pin point the units,im sure you will think im not very useful once you see what i mean,
the two silver objects in the few pics ,my finger tip is in between them on one pic
mike
ps why i ask is once i removed some caps and they were polystyrene and i damaged one with to much heat,this was a drama finding a replacement that worked to spec,
i also wounder if they are a transistor
the two silver objects in the few pics ,my finger tip is in between them on one pic
mike
ps why i ask is once i removed some caps and they were polystyrene and i damaged one with to much heat,this was a drama finding a replacement that worked to spec,
i also wounder if they are a transistor
Attachments
oh i am thinking of changing the rca plugs to the gold ones ,that was the one i changed out ,i think it would look nice,i used silver wire for the connections at rear
mike
mike
right then,
all the other inputs are fine other then the phono stage,well sort of?
i have hooked it up to turn table ,
on both mm and mc the left channel is down ,right channel clear as a bell left very low out put and hissing on left channel,
why i say that all other in puts are fine sort of is they sound great,however the balance knob is not effecting the the balance between the speakers ,it does a little but next to nothing really,the pots are clean ,no crackle and smooth ,i used contact cleaner,so im guessing it is some thing common to mm and mc for both left in puts to be down?
the cd input sounds very good,are these amps meant to be of good sound out put? it just seemed very good sounding the few min i was playing it
mike
all the other inputs are fine other then the phono stage,well sort of?
i have hooked it up to turn table ,
on both mm and mc the left channel is down ,right channel clear as a bell left very low out put and hissing on left channel,
why i say that all other in puts are fine sort of is they sound great,however the balance knob is not effecting the the balance between the speakers ,it does a little but next to nothing really,the pots are clean ,no crackle and smooth ,i used contact cleaner,so im guessing it is some thing common to mm and mc for both left in puts to be down?
the cd input sounds very good,are these amps meant to be of good sound out put? it just seemed very good sounding the few min i was playing it
mike
I think they had a pretty decent reputation for audio quality.
If both MM and MC inputs are down on one channel then that points to a problem either in how those two stages (the MM or MC) are coupled to the next stage or a problem in how the final RIAA stage connects to the input selector switch.
A problem like this is more likely to be a physical break or damage rather than a component fault.
The balance control can not completely remove audio from one or other channel but it should have a very noticeable effect. This again points to possible physical damage as a cause.
Look at the diagrams to see how the signal path proceeds. You need to trace the phono signal through each stages output and on to the next stage to make sure there is no break in continuity.
If both MM and MC inputs are down on one channel then that points to a problem either in how those two stages (the MM or MC) are coupled to the next stage or a problem in how the final RIAA stage connects to the input selector switch.
A problem like this is more likely to be a physical break or damage rather than a component fault.
The balance control can not completely remove audio from one or other channel but it should have a very noticeable effect. This again points to possible physical damage as a cause.
Look at the diagrams to see how the signal path proceeds. You need to trace the phono signal through each stages output and on to the next stage to make sure there is no break in continuity.
Attachments
i have checked with a looking glass and see no damage ,the mm and mc switch seems to switch well using the mutimeter,
i have trouble reading the diagrams as i have little experience with them ,
by any chance could you walk me though the diagrams and explain the basics to me?
things like power in ,signal in signal out ,what are the big triangles mean etc
how those diagrams would tell you where to look regarding the symptoms?
i have always wanted to lean to read these things ,its a super skill
mike
i have trouble reading the diagrams as i have little experience with them ,
by any chance could you walk me though the diagrams and explain the basics to me?
things like power in ,signal in signal out ,what are the big triangles mean etc
how those diagrams would tell you where to look regarding the symptoms?
i have always wanted to lean to read these things ,its a super skill
mike