sony hcd-gnx80 audio relay is not activated
transistor voltages Q644- b-0v. c-14.3v. e-0v.
Q647- b-0.6v. c-0v. e-0v.
Q666- b-0.7v. c-0.14v. e-0v.
Q648- b-0v. c-1.6v. e-0v.
On the bottom of the equipment, specifically below the front it has 4 screws that secure the front with the metal base. Check that you have them on, 2 of these screws make the hearing aid card (PHONES) connected to the chassis ground, the absence of these 2 screws is the reason that the relay does not close. I hope it's your case.
This does not bring that system, and the relay does not act in the absence of the 3.4v that come from the micro
Hi friend Evelio, ic550.
pin1-14.20v.
pin2-0v.
pin3-3.4v.
pin4-0v.
pin5-gnd.
pin6-14.20
Friend Evelio I need to fix this damage very soon, the customer is desperate, I ask the favor how to solve the fault. That tells me if I bypass the output contacts that I know is not recommended, it is left unprotected but it is a quick solution. Another is if I can make a separate circuit that controls the relay, but I don't know where to take the signal that goes to the base of the transistor. And finally take the signal of the relay of the surrond that is link relay, for front relay, but the surrond remain inactive and another is that I do not know how much current that pin sends, although the relays are the same reference.
Friend I need prompt and forceful response. If you have another idea, I appreciate it
Friend the 1.5v that reach the collector Q648 will serve you. Disconnect the line that comes from the microphone for the R644 and connect the 1.5v there (before the resistor to follow the voltage divider with the R645). Try and comment.
Very good news, perhaps I need to explain myself better or an image, but in the end I am resolved.
This fault is common in sony equipment, several have arrived to me and as you say they were already intervened and in some cases with the bridged developer and with the damaged amplifier you will already imagine how the speakers were, greetings.
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