These were all cleaned up and resoldered as suggested and can be seen in the pictures.
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Marantz SR92
- Thread starter Yorama
- Start date
There is no flux. I washed it after the soldering, the brown stuff you see is the board itself. Thank you.
I thought it was fixed?
It was, the problem I had there was with the Tuner and that works fine, but now it does not come out of the protection mode.
I figured we exhausted the option on the SR82 so I buttoned it up and put it away. got the SR92 on the bench to install the side covers and when tested discovered the problem.
The background story = I took the SR92 to a local tech shop for repair, he said the Tuner need apart that is not available but the SR82 which is more common has the same tuner and if I'll can get one that works, he can swap it and fix the problem, so I got that SR82 for parts but the tuner was not identical and while fitted in OK, did not function properly. so, we were back to square I took the SR92 home, with your help got it to work and life was great. now, I have SR85 too which I don't really need. and the SR92 not playing. BTW my current unit is 2238B
Thank you.
I figured we exhausted the option on the SR82 so I buttoned it up and put it away. got the SR92 on the bench to install the side covers and when tested discovered the problem.
The background story = I took the SR92 to a local tech shop for repair, he said the Tuner need apart that is not available but the SR82 which is more common has the same tuner and if I'll can get one that works, he can swap it and fix the problem, so I got that SR82 for parts but the tuner was not identical and while fitted in OK, did not function properly. so, we were back to square I took the SR92 home, with your help got it to work and life was great. now, I have SR85 too which I don't really need. and the SR92 not playing. BTW my current unit is 2238B
Thank you.
Attachments
You have an SR85 in addition to the SR82 and SR92?
- SR92 - After repairing the tuner, the SR92 worked fine both the tuner and amp. But now it doesn't work and does not come out of protection mode?
- SR82 - No conclusion on the problem. Bought for parts. Put away for now.
- SR85 - Don't need it.
BTW, nice 2238B... looks similar to my 2252B.
No, no SR85 (miss typed), talking about the SR82. I don't know that there is even a model like that SR85.
1. yes, this is correct. (Turns ON but does not come out of protection)
2. Yes, this is correct.
3. I don't have SR85
Yes, this is correct
"So now you want to re-investigate why the SR92 (which fully worked a few days ago) is now not coming out of protection?
BTW, nice 2238B... looks similar to my 2252B."
I thought you might like it.
I know you have the knowledge and the persistence, you good at it.
Will you help? PLEASE.
Thank you.
1. yes, this is correct. (Turns ON but does not come out of protection)
2. Yes, this is correct.
3. I don't have SR85
Yes, this is correct
"So now you want to re-investigate why the SR92 (which fully worked a few days ago) is now not coming out of protection?
BTW, nice 2238B... looks similar to my 2252B."
I thought you might like it.
I know you have the knowledge and the persistence, you good at it.
Will you help? PLEASE.
Thank you.
Let's first take a look at the protect circuit that decides to turn on the relays.
Here is the schematic for the PV04 PCB.
I have highlighted the speaker relays in yellow and the protection circuit IC, QN06 (TA7317P) that controls turning on the speaker relays.
That part is located here on the PC board. It is a 9-pin SIP package as shown on the TA7317P Datasheet below.
Please measure the DC voltages on the 9-pins of the IC and compare them against the schematic below and report what you find.
Here is the schematic for the PV04 PCB.
I have highlighted the speaker relays in yellow and the protection circuit IC, QN06 (TA7317P) that controls turning on the speaker relays.
That part is located here on the PC board. It is a 9-pin SIP package as shown on the TA7317P Datasheet below.
Please measure the DC voltages on the 9-pins of the IC and compare them against the schematic below and report what you find.
Please check your voltage measurements. They can't be right since pins 7, 4, & 5 should be 0v connected to ground. Maybe the other pins are off also?
Something is not right with this schematic??? If you look at the board pins, 5, 7 are not connected to ground. Only 4 could be.
Unless your board has jumpers instead of RN24 & RN25?
Something is not right with this schematic??? If you look at the board pins, 5, 7 are not connected to ground. Only 4 could be.
Unless your board has jumpers instead of RN24 & RN25?
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Voltages measured again and list is slightly adjusted (receiver was connected via dimbulb first, now connected directly to AC outlet) measurements were made between chassis and the IC QN06 pins Pin 7 = -2.2V , Pin 4 = -2.2V , Pin 5 = -2.9
RN24 measure 12 m/ohm , RN25 33K
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RN24 measure 12 m/ohm , RN25 33K
