Hi again!
In my repair process I have found some burned parts that I have replaced but I read in the manual this note:
"If the wave form is distorted or non- existent, or there
is DC OFFSET, do not attempt to connect any M1002 module to the M1011 or you will immediately destroy
the new or repaired M1002 and will also cause more damage to the rest of the amplifier."
SEE THE SERVICE MANUAL HERE:
https://www.nodevice.com/service-manuals/audio/yorkville/ap3000-1/454806
I have measured the TEST POINT 5 Voltage (referred to ground) and TEST POINT 6 Voltage (referred to ground) in the M1011 Preamp Output Board and I got a 105 VDC in both places. This look like OFFSET VOLTAGE to me but I am not sure if I am doing something wrong with my measurements because I have disconnected the M1002 Power Amp Board only without any "PATCH PLUGS" !!......by the way what this means??
My question is: if the LDRV and RDRV output coming from the M1011 boards coming from a COMPLEMENTARY TRANSISTORS SYMMETRY PAIR; What Voltage must be hope to get there in the "quiescent point" without any applied AC signal to the input connectors??
Thanks anticipated for any help!
opacheco.
In my repair process I have found some burned parts that I have replaced but I read in the manual this note:
"If the wave form is distorted or non- existent, or there
is DC OFFSET, do not attempt to connect any M1002 module to the M1011 or you will immediately destroy
the new or repaired M1002 and will also cause more damage to the rest of the amplifier."
SEE THE SERVICE MANUAL HERE:
https://www.nodevice.com/service-manuals/audio/yorkville/ap3000-1/454806
I have measured the TEST POINT 5 Voltage (referred to ground) and TEST POINT 6 Voltage (referred to ground) in the M1011 Preamp Output Board and I got a 105 VDC in both places. This look like OFFSET VOLTAGE to me but I am not sure if I am doing something wrong with my measurements because I have disconnected the M1002 Power Amp Board only without any "PATCH PLUGS" !!......by the way what this means??
My question is: if the LDRV and RDRV output coming from the M1011 boards coming from a COMPLEMENTARY TRANSISTORS SYMMETRY PAIR; What Voltage must be hope to get there in the "quiescent point" without any applied AC signal to the input connectors??
Thanks anticipated for any help!
opacheco.