Editing Tandon TM100-1 (section)

== Alignment and adjustment ==

Tandon's own tolerances, from Section 5 of the service manual.<ref name="tandon" /> All of these need a dual-channel oscilloscope, a certified alignment diskette (Tandon specifies '''Dysan 224/2A''' or equivalent) and a means of stepping the drive.

{| class="wikitable styled-table" style="width:100%;"
|-
! Check !! Tolerance !! Adjustment
|-
| Drive motor speed || '''300 RPM ± 1.5 %''' || R4 on the servo circuit board, with the 50 Hz or 60 Hz strobe ring on the spindle pulley stationary under mains-powered fluorescent light
|-
| Radial track alignment || Cat's eye pattern at Track 16: the smaller lobe not less than '''75 %''' of the larger || Head module retaining and cam screws. Track 16 sits at a radius of 1.9167 inches from the hub centre; other tracks follow from 48 TPI
|-
| Index to data || '''200 ± 100 µs''' at Track 1 || Index sensor retaining screw
|-
| Head azimuth || Within '''± 18 minutes''' of arc, checked on the third burst at Track 34 || '''Not adjustable.''' If it fails, replace the head module assembly
|-
| Track 0 switch and stop || Per Section 5.9 and 5.10 || Switch position and stop
|}

The alignment diskette and the drive must be left to stabilise at room temperature for '''one hour''' before any check or adjustment.<ref name="tandon" />