Yamaha MS400 Service Manual

Also see for MS400: Owner's manual

Contents

MS40018• Finished product inspection1. Preparation1) input terminal: LINE INPUT (XLR)2) OUTPUT: LFHF3) LINE LEVEL: MAX(10)4) MIC LEVEL: MIN(0)5) MASTER LEVEL: MAX(10)6) TONE CONTROL HIGH: Center click position (0)7) TONE CONTROL LOW: MAX(0)2. Inspection1) Input a 20Hz to 20kHz, 0.08V(-19.72dBu) sine wavesignal to the input terminal LINE INPUT (XLR) andcheck that none of the contact of the voice coil, airleakage and abnormal noise such as vibration noiseoccurs.Next, input music signals to the input terminal LINEINPUT (XLR), move each VR knob and check thatthe sound volume and tone quality change smoothlywithout producing noise.2) Phase of speaker outputCheck that the output at LF is in positive phase withrespect to the input signal and the output at HF is innegative phase with respect to the input signal.www . xiaoyu163. comQQ 376315150 992894298TEL 13942296513 992894298051513673QQTEL 13942296513 QQ 376315150 892498299TEL 13942296513 QQ 376315150 892498299http://www.xiaoyu163.comhttp://www.xiaoyu163.com