Hi and thanks for helping me figure this out.
I bought a used Rotel RDV1080 for use as a CD transport, the seller and I do not know where or by who it was modified.
Looks like it has a second mini power supply board and an additional board. I can see a clock crystal, capacitors, resistors, a potentiometer? and a chip with no visible markings on the second board. No sure what the blue stuff on the chip is.
The output from this board feeds into a sub board below the CD tray where two chips have been removed (HY57V161610DTC8 DRAM chips). It connects to a terminal (X351) which is labeled "crystal 33.8688MHZ" in the service manual.
Power supply board:
Additional board:
The main channel audio board has also been upgraded with large Elna Cerafine Electrolytic caps, bypassed with 0.1uf Vishay MKT Film caps on the back of the board.
Film and poly caps on reverse
Polystyrene caps are tagged onto this set of resistors.
Polystyrene caps have also been soldered on to a set of resistors in the signal path just before it exits at the RCA output.
Feel free to dig into this work. Looks like this was someones passion project.
I'm just keen to learn and figure out whats going on.
Video of the unit
I bought a used Rotel RDV1080 for use as a CD transport, the seller and I do not know where or by who it was modified.
Looks like it has a second mini power supply board and an additional board. I can see a clock crystal, capacitors, resistors, a potentiometer? and a chip with no visible markings on the second board. No sure what the blue stuff on the chip is.
The output from this board feeds into a sub board below the CD tray where two chips have been removed (HY57V161610DTC8 DRAM chips). It connects to a terminal (X351) which is labeled "crystal 33.8688MHZ" in the service manual.
- Is this a clock crystal upgrade / replacement?
Power supply board:
Additional board:
The main channel audio board has also been upgraded with large Elna Cerafine Electrolytic caps, bypassed with 0.1uf Vishay MKT Film caps on the back of the board.
- Is this a good technique to bypass the Ecaps?
Film and poly caps on reverse
Polystyrene caps have also been soldered on to a set of resistors in the signal path just before it exits at the RCA output.
- Any Idea how this helps?
- Is the JVC chip on the back of the board the DAC?
Feel free to dig into this work. Looks like this was someones passion project.
I'm just keen to learn and figure out whats going on.
Video of the unit
