Working on a Rockford T1000-1bd (non CP), and found I had no signal going into the BD card (1325-52874) on Pin 1 (P401-A) of the back header. I checked and I had signal coming out of pin 9 (P200-I) on the front xover header and going into the EQ card on pin 9 (P301-I), but no signal coming out of EQ card on Pin 9 (P302-I) which goes to the BD card input.
I checked the LV + and - and found it pulled down to about +7 and -8 volts (should be about +-13V)
Pulled the EQ card and found I had a short from Pin 14 (S2) to pin 13 (V+) on the DG201BDY analog chip. With the card out my LV is back to +-13V.
I do not have a spare DG201BDY, so while I wait for one to get to me, how best can I jumper from the xover to the BD input, just a jumper wire, or should I use a capacitor? That way I can finish testing the amp (just in case I need to order anything else).
Thanks in advance.
Crazylogix
I checked the LV + and - and found it pulled down to about +7 and -8 volts (should be about +-13V)
Pulled the EQ card and found I had a short from Pin 14 (S2) to pin 13 (V+) on the DG201BDY analog chip. With the card out my LV is back to +-13V.
I do not have a spare DG201BDY, so while I wait for one to get to me, how best can I jumper from the xover to the BD input, just a jumper wire, or should I use a capacitor? That way I can finish testing the amp (just in case I need to order anything else).
Thanks in advance.
Crazylogix
Was the short between pins with the board out?
I'd probably user a 1k resistor to bypass the board but a wire should be OK.
I'd probably user a 1k resistor to bypass the board but a wire should be OK.
There was something pulling down the LV supply and with nothing coming out of the eq card, so I pulled that one. Once I had the card out, checked for shorts on the card, it showed a short on the TL072 and the DG201BDY. I removed both chips and checked the EQ board, the short was gone. I checked both chips and found the short was gone on the TL072, but the short remained on the DG201BDY chip between pins 13 and 14.
I think I will go with the 1K resistor, since the EQ board does pass through the TL072, I figured something should probably be in there. Was looking for the voice of experience on bypassing something like this. Thanks Perry.
I think I will go with the 1K resistor, since the EQ board does pass through the TL072, I figured something should probably be in there. Was looking for the voice of experience on bypassing something like this. Thanks Perry.