AudioPuppet
AudioPuppet
2225 Bias adjustment correction
2225 Idle current adjust:
SM says measure J712 - 718 for one channel, 713 to 719 for the other. Proper measuring points for forward bias are at J714 to 716 and adjust R733 for 20mVDC on that channel. Then measure J715 to 717 and adjust R734 for 20mV on the other channel ... This is the same mistake as the 2220B SM
Restoring a 2225 for my buddy and discovered this like , 30 mins ago ..:thmbsp:
BTW , 2225 sounds awesome restored .. Ya got one . DO IT !!
FWIW .. A friend of mine father was a Marantz tech and I was told that Marantz made mistakes in the SM on purpose to keep hacks from working on them .... ( Like me ?!?! )
Peace
2225 Idle current adjust:
SM says measure J712 - 718 for one channel, 713 to 719 for the other. Proper measuring points for forward bias are at J714 to 716 and adjust R733 for 20mVDC on that channel. Then measure J715 to 717 and adjust R734 for 20mV on the other channel ... This is the same mistake as the 2220B SM
Restoring a 2225 for my buddy and discovered this like , 30 mins ago ..:thmbsp:
BTW , 2225 sounds awesome restored .. Ya got one . DO IT !!
FWIW .. A friend of mine father was a Marantz tech and I was told that Marantz made mistakes in the SM on purpose to keep hacks from working on them .... ( Like me ?!?! )
Peace