Mitsubishi Electric M4853, Maintenance Manual

Page: 79 / 108

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