JVC XL-V120 cd player problems

rbroer · 29th October 2003, 12:21 PM

It's a longshot I know, but does anyone have the schematics for this player ?

Just wanted to make my bro happier with some more "improvements" on the output stages.
But now it stays in standby mode

Dac, opamps get voltage, the 16MHz clock is active (in standby mode) but cannot get it "ON".

Anyone has experience with these JVC's ?
Do they use transistors to switch on the "main power" ?
Could it be some reset problem ?

Any ideas about these signals from/to the main pcb/display&buttons pcb

Thanx,

Netlist · 29th October 2003, 08:09 PM

Hi Rudolf
Just a quick guess.
Sometimes there are these small fuses near the power supply.
They look like transistors, say a BC550 but only have two pins.
I remember JVC used them a lot in older videos.

/Hugo

rbroer · 30th October 2003, 06:30 AM

Yes, I know, mostly seen 'm in Japanese gear (Pioneer etc.)

This player doesn't have 'm

Like I said before, all voltages seem to be present,

-28V for the VDISP, F1 & F2, 5V, +/-12V for opamp, 16MHz crystal is operating etc.
Assuming now it's in the controller board (buttons, display etc.)

Spent too much time on it and am giving up, just another victim

30th October 2003, 06:30 AM	#3
rbroer diyAudio Member Join Date: Mar 2002 Location: Netherlands	Yes, I know, mostly seen 'm in Japanese gear (Pioneer etc.) This player doesn't have 'm Like I said before, all voltages seem to be present, -28V for the VDISP, F1 & F2, 5V, +/-12V for opamp, 16MHz crystal is operating etc. Assuming now it's in the controller board (buttons, display etc.) Spent too much time on it and am giving up, just another victim __________________ Rudolf Broertjes

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29th October 2003, 08:09 PM	#2
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Hi Rudolf Just a quick guess. Sometimes there are these small fuses near the power supply. They look like transistors, say a BC550 but only have two pins. I remember JVC used them a lot in older videos. /Hugo