| 摘要 |
When an operator inserts a standard magnetic tape into the magnetic recording and reproducing apparatus and performs operation for bringing the apparatus into the play mode for checking X value, the tracking value varies in stages, and an external device or the magnetic recording and reproducing apparatus produces an envelope detected output having a value corresponding to an output from the rotary heads, samples an envelope detected output at predetermined positions within a single trace by the rotary heads in each tracking value, and executes a check of the preset value (X value) or a check of the linearity of the tracking value of the rotary heads.
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