hcruz
Looking for that NLA mosfet that fell off th bench
After my AU-517 successful recap I decided to put my 9090 receiver on the bench for an overhaul.
After taking off the casing and faceplate the first thing did was check the offset and bias.
Offset was 7 mV on the left channel and 12mV on the right channel.
Not too bad according to EW sticky.
Now, with the bias I'm confused.
The manual states that readings should be 50mA across fuses (disconnected) F07 and F08 for left and right channels.
My readings of the right channel are 12mA. When I adjust VR04 I can only go as far as 21mA. going the other way around gets it to 8mA and cannot go any further either way.
Am I measuring the wrong thing or is there a serious issue with the receiver?
See Pictures below
From Service Manual
After taking off the casing and faceplate the first thing did was check the offset and bias.
Offset was 7 mV on the left channel and 12mV on the right channel.
Not too bad according to EW sticky.
Now, with the bias I'm confused.
The manual states that readings should be 50mA across fuses (disconnected) F07 and F08 for left and right channels.
My readings of the right channel are 12mA. When I adjust VR04 I can only go as far as 21mA. going the other way around gets it to 8mA and cannot go any further either way.
Am I measuring the wrong thing or is there a serious issue with the receiver?
See Pictures below
From Service Manual