Aaron99
Active Member
I have a 2265 that has been sitting in the stack waiting its turn. I plan on restoring it to listen in my garage.
Physical inspection looks good. All three tone pots are stuck. Powered up on DBT, the lights are very green, there is a slight hum. Left channel is distorted in speakers, not in headphones (when speakers are not enabled).
Initial Adjustments:
Took off the DBT. Plugged into main, set p800 voltage to 35V, set DC Offset to 0 on Left and Right, no problems.
then tried idle-current.
Right set to 13 mV.
Left when measure between J715/J716 it is always 0 volts, no matter what I set R717 to.
Tone Board:
It had something I had not ever seen. I could not turn the mid and bass pots at all. Its as if someone lubricated them with superglue. I took it apart to remove the board and tried to see if there was anything broken with the pots. They look fine, just very tight. I sprayed with deoxit and faderlube to see if they would losen up. I could not get the mid bass pot to budge. The treble pot loosened up some, but still very tight.
Since I had a 2275 tone board for parts, I moved all three pots over since they are the same part number. Now they seem good. I can adjust the tone controls and the sound changes with them.
Lamps:
Since I had the face off, time to replace the fuselamps with warm white LEDS. I replaced the burnt out Stereo lamp with an 8V incandescent bipin lamp. The 8V led was a little too bright and made the stereo lamp look a little orange.
Power Board (P800):
New relay. MY2-02-24DC
Replaced the electrolytic caps with Nichicon PW series on power supply.
Hum seems to have gone away.
Left amp board (P700)
Now back to the Left amp board.
I removed and tested the outputs, and reseated with fresh DOW 340.
Still can not adjust idle-current.
Since distortion only shows up when I press the speaker (system1) button, I thought there might be a problem with the Outputs. I replaced the D555 -> MJ21194G, and B600 -> MJ21193G. No Difference, distortion on speakers, clear in headphones, unless the system1 button is enabled.
I then moved on to the diff pair.
Replaced H701/H702 with KSA992FBU HFE matched and bound with thermal paste and heatshrink. The originals were not bound together.
I'm kind of getting stuck for now, and would love any pointers....
Physical inspection looks good. All three tone pots are stuck. Powered up on DBT, the lights are very green, there is a slight hum. Left channel is distorted in speakers, not in headphones (when speakers are not enabled).
Initial Adjustments:
Took off the DBT. Plugged into main, set p800 voltage to 35V, set DC Offset to 0 on Left and Right, no problems.
then tried idle-current.
Right set to 13 mV.
Left when measure between J715/J716 it is always 0 volts, no matter what I set R717 to.
Tone Board:
It had something I had not ever seen. I could not turn the mid and bass pots at all. Its as if someone lubricated them with superglue. I took it apart to remove the board and tried to see if there was anything broken with the pots. They look fine, just very tight. I sprayed with deoxit and faderlube to see if they would losen up. I could not get the mid bass pot to budge. The treble pot loosened up some, but still very tight.
Since I had a 2275 tone board for parts, I moved all three pots over since they are the same part number. Now they seem good. I can adjust the tone controls and the sound changes with them.
Lamps:
Since I had the face off, time to replace the fuselamps with warm white LEDS. I replaced the burnt out Stereo lamp with an 8V incandescent bipin lamp. The 8V led was a little too bright and made the stereo lamp look a little orange.
Power Board (P800):
New relay. MY2-02-24DC
Replaced the electrolytic caps with Nichicon PW series on power supply.
Hum seems to have gone away.
Left amp board (P700)
Now back to the Left amp board.
I removed and tested the outputs, and reseated with fresh DOW 340.
Still can not adjust idle-current.
Since distortion only shows up when I press the speaker (system1) button, I thought there might be a problem with the Outputs. I replaced the D555 -> MJ21194G, and B600 -> MJ21193G. No Difference, distortion on speakers, clear in headphones, unless the system1 button is enabled.
I then moved on to the diff pair.
Replaced H701/H702 with KSA992FBU HFE matched and bound with thermal paste and heatshrink. The originals were not bound together.
I'm kind of getting stuck for now, and would love any pointers....
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