Hi @cucu70
I had repaired 4 those amps, and always desoldered ZVP wasn't recognized by universal tester, despite that they were fully working. Strange thing, new transistor just bought out of the box is fully reconized by the same universal tester, but those from amplifier desoldered - all of them recognised as diodes.
Tried to solder brand new in place of that desoldered - sound was the same, no difference, therefore soldered back the old one (unrecognized) - again all worked fine.
This is one of difficulties to diagnose this particular amp model among others...
For instance if you will do "bulb test" for fully working amp at "cold turn on", bulb test will fail as bulb will constantly glow on full intensity. But when I know that I fixed amp, I ignore bulb test, replacing bulb with fuse, turning, on, letting warm up for 15mins. Then on "warm turn on" bulb test works fine, shows bulb glow intersity dropping quickly as supposed. So for this amp model "bulb test" can't be performed or trusted.
I had repaired 4 those amps, and always desoldered ZVP wasn't recognized by universal tester, despite that they were fully working. Strange thing, new transistor just bought out of the box is fully reconized by the same universal tester, but those from amplifier desoldered - all of them recognised as diodes.
Tried to solder brand new in place of that desoldered - sound was the same, no difference, therefore soldered back the old one (unrecognized) - again all worked fine.
This is one of difficulties to diagnose this particular amp model among others...
For instance if you will do "bulb test" for fully working amp at "cold turn on", bulb test will fail as bulb will constantly glow on full intensity. But when I know that I fixed amp, I ignore bulb test, replacing bulb with fuse, turning, on, letting warm up for 15mins. Then on "warm turn on" bulb test works fine, shows bulb glow intersity dropping quickly as supposed. So for this amp model "bulb test" can't be performed or trusted.
Good afternoon & season’s greetings from a newbie to this forum.
My A3i has been playing up for a little while & gradually getting worse.
When the A3i is 1st switched on, I used to get a little “click” after a second or two & could play music thereafter, the duration between switching on & the little “click” & being able to hear music has been getting longer & longer, were into minutes now before I hear any output ?
Is this a known problem ?
I’ve read a lot of these posts, but haven’t seen this symptom, would this be a simple fix for someone with the right skills & equipment ?
Thanks for any input.
KTMKev.
My A3i has been playing up for a little while & gradually getting worse.
When the A3i is 1st switched on, I used to get a little “click” after a second or two & could play music thereafter, the duration between switching on & the little “click” & being able to hear music has been getting longer & longer, were into minutes now before I hear any output ?
Is this a known problem ?
I’ve read a lot of these posts, but haven’t seen this symptom, would this be a simple fix for someone with the right skills & equipment ?
Thanks for any input.
KTMKev.
before start the usual troubleshooting I would remove completely and very carefully all existing (and known) deficiencies, which unfortunately are very numerous, and which can cause a wide variety of error patterns.
The quality of the Chinese manufacturer's craftsmanship was unfortunately very poor (even in comparison to the A1/Atac 3, the predecessor of the model "A3i").