Alignment Check (Fdd Unit) - Sony MVC-FD85 Service Manual

2. Alignment Check (FDD UNIT)

Confirm that the FDD alignment is within the specifications.
If deviated, reading and writing data from and to the floppy disk
become impossible. Or compatibility of the floppy disk with other
machines can be lost.
Mode Playback
Signal Alignment disks (TFD2-1(+) and
TFD2-2(–)): Arbitrary signal
Measurement Point
Check on LCD screen
Measuring Instrument
Specified Value The playback pictures should be
normal.
Checking method:
1) Disconnect the adjustment remote commander.
2) Insert the alignment disk TFD2-1(+) (+17.5 µm).
3) Playback arbitrary signal and check that the playback picture
is normal.
4) Insert the alignment disk TFD2-2(–) (–17.5 µm).
5) Playback arbitrary signal and check that the playback picture
is normal.
[Alignment disk]
Use the alignment disks (two disks as pair) shown in below.
Disk-1: TFD2-1(+) (Parts code: 8-967-990-01)
Disk-2: TFD2-2(–) (Parts code: 8-967-990-11)
Contents of alignment disk
TFD2-1(+): (Common signal) + (+17.5 µm alignment)
TFD2-2(–): (Common signal) + (–17.5 µm alignment)
Common signal
File name
MVC-001C.JPG Color bars
MVC-002M.JPG Monoscope
MVC-003V.JPG V-COM adjustment signal
MVC-004W.JPG 100% white
MVC-005H.JPG 50% white
MVC-006T.JPG Stair-step signal of 10 step
MVC-007R.JPG Red single color
MVC-008G.JPG Green single color
MVC-009B.JPG Blue single color
MVC-010D.JPG Camera color bars
MVC-011N.JPG Camera monoscope
Signal
5-38