Table of Contents
Advertisement
5-6. INDEX PHASE
5-6-1. Tools and Measurement Equipment
a. Oscilloscope
b. MFD Checker II
ED
c. Alignment Disk (OR·D47VA)
Em
d. Alignment Disk (OR-D47WA)
e. Adj rod.
5-6-2. Measurement
a. Connect the disk drive to the MFD Checker
ll. (Refer to Fig. 2-1)
b. Insert the alignment disk in place.
c. Connect the oscilloscope probe tip to
CN 107-1 and trigger the oscilloscope at TP-
5 of the MFD Checker II.
d. Move the head to TRK 40.
e. Check if the phase relation between the
INDEX signal and output signal meets the
specification shown in Fig. 5-6 (a).
I
j~
j
0 tl00jlsec.·
Fig.
5-6
(a) Index Phase Specification
5-6-3. Adjustment
a. If the phase relation described above does
not meet the specification, adjust RVIOI
on the FC-9/FC-14 Mounted Board with an
adj rod tool.
NOTE:
If
adjustment of RVIOI does not satisfy
the specification, the disk drive motor
may be damaged. For the replacement,
please refer to S·S.
RV101
Shield Plate
Fig.
5-6
(b) Index Phase Adjustment
-47-
Index Phase
5-7. READ AMPLIFIER GAIN AND READ
AMPLIFIER OFF SET
5-7-1. Tools and Measuring Equipment
a. Oscilloscope
b. MFD Checker II
Em
c. Level Disk (OR·D46VA)
Em
d. Level Disk (OR·D46WA)
e. Adj rod
5-7-2. Measurement
a. Connect the disk drive to the MFD Checker
II. (Refer to Fig. 2-1)
b. Connect the
os~illoscope probe tip (CH-l)
to CNI07-1 built in the disk drive and
other tip (CH-2) to TP-5 of the MFD
Checker II.
NOTE:
The vertical sensitivities are set at 0.2
V/dlv on Cn·l and at 2
V/dlv
on Cn-2
with a timing range of 10
ms/dlv.
The
oscilloscope
is
triggered by the signal on
Cn-2.
c. Select display only for CH-l.
d. Insert the level disk in place and move the
head to TRK 79.
_
e. Set the SIDE SELEer switch on the MFD
Checker
n
to side O.
f. Press the WRITE switch, and then "2F" is
written into the disk.
g. Check if the peak.ta-peak value of the out-
put waveform for "2F" is 0.6
±
0.2 V
(Em
0.35
±
0.15 V). (Refer to Fig. 5-7 (a) )
Em
h. Set the SIDE SELEer switch on the MFD
Checker
n
to side 1.
Em
i. Press the WRITE switch, and then "2F" is
written into the disk.
Em
j. Check if the peak·ta-peak value of the out-
put waveform for "2F" is
I
O. 3S±O .1SV
(Refer to Fig. 5-7 (a»
k. Connect the oscilloscope probe tip (CH-2)
to TP-3 on the MFD Checker II.
L Operate the oscilloscope in the chop mode
with a timing range of 0.5 J.l.sec/div.
Em
to.15 V
(aJ
Advertisement
Table of Contents
