Mitsubishi Electric M4853 Maintenance Manual page 79

.3.2 T K O O s e n s o r
1) Equipments
CE Tester
Scratch diskette
No. 1 plus screw driver
Oscilloscope
2) Adjustment procedure
2)-1
2)-2
2)-3
2)-4
2) -5
3) Note:
3) -1
3) -2
4) Check
4) -1
4)-2
4)-3
4)-4
4)-5
4)-6
p o s i t i o n a d j u s t m e n t
Connect CE Tester to drive then turn-on power
switch and load diskette.
Turn-on motor and select drive.
Repeat seek between TKOO and 02
Observe waveform (TKOO)
scope
Trigger CHI — step (DC, -) TPC 15
Signal CH2 -+TK00 (DC, +) TPD
Loosen screw and adjust time 7 until it comes
to within 2.5 - 3.5 ms by moving TKOO in the
direction of the. arrow.
Set step rate at 3 ms using CE tester.
Make sure there are 2 pluses on step signals.
Repeat seek between TK02 and TK04
Observe level of TKOO signal at TPC13 using
oscilloscope.
trigger CHI - -step
signal CH2 - +TK00
Check level of signal is low.
Seek to TKOO
Observe level of signal (TKOO) at TPC13 using
oscilloscope .
trigger CHI -
signal CH2 - +TK0Ö
Check level of
(Phillips #1)
at TPDl using oscillo­
(see figure)
(DC, -) TPC 15
(DC, +) TPC 13
(DC, -) TPC
- s t e D
(DC, +) TPC
signal is hich.
(see figure 5).
1
15
13