This is a compilation of errors in Marantz service manuals. These corrections will likely save you from smoking your receiver. Remember to use some good mini grabber leads when you're adjusting bias, I've read way too many horror stories of slipping probes. Big thanks to Tom (catrafter) for contributing most of these. 2220B Idle current adjust: SM says measure J712 - 718 for one channel, 713 to 719 for the other. WRONG! Do this instead: Measure bias 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. 2220B Cap listing: Service manual lists CE21 & CE22 as 33 uF/50v. Should be 3.3 uf/50v. CE23 & CE24 listed as standard 1.0 uF/50V. Use non polar caps here. C709 and C710 should be 47uf 50V, not the listed 500V. 2230 Voltage adjustment: Manual says measure J08 to Ground. Should be J808. 2265B Parts list error: SM shows 1000uF/55V for C003/C004 filter capacitors. Value should be 10000uF/55V. 2270 SN<3901 Idle current or bias adjust: Meter set to read DC mV, connect from J753 to J754, set R763 for 5mV 2270 SN>3900 Idle current or bias adjust: Meter set to read DC mV, connect from J754 to J760, set R763 for 10mV 2275 Idle current or bias adjust: SM says measure 707-708, adjust R742 for 10mV. Do this instead: Meter set to read DC mV, connect from J703 to J704, set R742 for 10mV 2325 Silk screen is wrong on PH01 board: Positive side of CH13 goes toward the center of the board. 1060 diode (early models): http://www.audiokarma.org/forums/showthread.php?t=439676 1070 DC Offset adjust: SM says R724, change to J724. 1070 Cap List error: SM lists CE05/06 as 47uF/35V. Amp actually uses 4.7uF/25V, reflected on schematics as well. 2230, 2245, 2270 AM tuner: C183 silk screen is backwards. The + side of the cap goes to chassis ground. C181 has no polarity silk screen. The + side goes toward the edge of the board. 2330B Schematic Error - http://www.audiokarma.org/forums/showpost.php?p=5022087&postcount=23 If you know any other errors in Marantz SMs, please post them.