抹音部分本机采用交流抹音.抹音电流为偏磁振荡电路输出的85千赫交流电流.在3R_(55)(1.1欧)上可测得抹音电压为44～99毫伏,一般为90毫伏左右.在抹音磁头上可测得交流抹音电压为20伏左右(用毫伏表测得).当偏磁振荡电路发生故障时,即出现抹音抹不净现象.偏磁振荡电路停振或无偏磁电压输出等故障已在“录音失真”一节中谈过.抹音磁头的故障有以下几 The erasing part of the machine uses AC erase sound. Erasing current bias magnetic bias circuit output 85 kHz AC current. 3R_ (55) (1.1 Europe) can be measured erase voltage of 44 to 99 millivolts, the general Is about 90 millivolts. In the wiping head can be measured AC wiping voltage is about 20 volts (measured with the millivoltmeter) .When the bias magnetic circuit failure, the phenomenon of wiping wipe net phenomenon. Magnetic oscillation circuit stops or unbiased magnetic voltage output and other failures have been talked about in the “recording distortion.” Wipe sound head failure are the following