Hi everybody,
I am the proud owner of a Denon PMA-560 that my father gave to me a few years ago. Sadly, the sound coming out of the speakers recently started to deteriorate. First in the right channel, then in both. The sound is randomly coming out more or less clean. Sometimes, there is barely any sound coming out...
I have not been able to attribute the issue to a specific input ou output channel. It keeps coming back no matter the source (turntable/PC), the input or the output. I already tried cleaning the output switch as it was tripping (same issue as in this thread) but the problem persists. All of this led me to think that there is a faulty electronic component that I should replace.
Ther person behind this great website helped me and it seems that the output relays could be responsible (specs are : HEC DHT2TU type, 24VDC, 3A120V AC). I don't know which relay I should buy to replace them.
Should I look for the same specs ? If yes should it be a coil tension of 24V ~120V AC or DC ?
Could I kill two birds with one stone and chose some better ones to make an upgrade ? If yes which ones ?
Thanks for taking the time to read this !
I am the proud owner of a Denon PMA-560 that my father gave to me a few years ago. Sadly, the sound coming out of the speakers recently started to deteriorate. First in the right channel, then in both. The sound is randomly coming out more or less clean. Sometimes, there is barely any sound coming out...
I have not been able to attribute the issue to a specific input ou output channel. It keeps coming back no matter the source (turntable/PC), the input or the output. I already tried cleaning the output switch as it was tripping (same issue as in this thread) but the problem persists. All of this led me to think that there is a faulty electronic component that I should replace.
Ther person behind this great website helped me and it seems that the output relays could be responsible (specs are : HEC DHT2TU type, 24VDC, 3A120V AC). I don't know which relay I should buy to replace them.
Should I look for the same specs ? If yes should it be a coil tension of 24V ~120V AC or DC ?
Could I kill two birds with one stone and chose some better ones to make an upgrade ? If yes which ones ?
Thanks for taking the time to read this !
You have to refer to the schematic.The relays are RL601 and RL602, with description DH2TU.
They may be 24V coils, since there are series resistors on the coils and a 50V rail.
Look at the relays for the mfr name and part number. You have to get relays that fit the board properly.
https://www.pma560.com/pma560_service_manual.pdf
They may be 24V coils, since there are series resistors on the coils and a 50V rail.
Look at the relays for the mfr name and part number. You have to get relays that fit the board properly.
https://www.pma560.com/pma560_service_manual.pdf
The correct part is a DEC DH2TU, 1100Ω 24VDC coil, cross-bar twin contact, rated 3A@120VAC.
https://www.j-dec.co.jp/files/libs/713/202501090911052566.pdf