Y-E Data YD-380 - Track 00 Sensor Assembly

6. Verify that the timing between':the start of the sweep and
the first peak of the index burst is between -600 to 1400 ~s
at side 0 and 1, track 02 and track 68.
4.3 Track 00 Sensor Assembly (Refer to Chapter 5, Figure 4)
4.3.1 Service Check 1, Track 00 Sensor
,
1. Power up the drive.· (Resets memo~ies in PWB)
2. Step the head/carriage assembly to a position near the
inner stop.
3. Check the following:
a. Track 00 Lamp:
The
voltage across PWB J3-A12 and G (GND) should be
between
1.0 and 1.7 V.
b. Track 00 Sensor:
The voltage across PWB J3-A13 and G (GND) should be
between 0 and 0.5 v.
4. Power the drive down and up again. (Resets PWB memories)
5. Check the following:.
a. Track 00 Sensor:
The voltage across PWB J3-A13 and G(GND) should be
"between
2.5 and 5.25 V.
Service Check 2, Track 00 Sensor Position Check
1. With power off, move the head/carriage assembly all the way
to the outer stop.
2. Power up the drive.
3. When power is applied, the head/carriage assembly should
move inwards slightly. The Track 00 signal (Jl-26) should
be at Low level (0 to 0.4 V).
4. Move the head/carriage assembly five steps inward and one
step outward. The voltage should change to a High level
of 2.4 to 5.25 v.