Adjustment; Disk Drive Dc Motor Speed; Tools And Measuring Equipment - Sony OA-D32W Service Manual

Disk Drive DC Motor Speed
(b)
(e)
Fig.5-7
m.Select "Uncal" on the timing axi~ of the
oscilloscope and then such a waveform as
shown in Fig. 5-7 (b) can be obtaind.
lED
n. Check if no jittery pulse follows the trig-
gered one. (Refer to Fig. 5-7 (b»
_ o. Check if the pulses are issued from side 0
or 1 every 2.0 ± 0.2IJsec. (Refer to Fig.
5-7 (c»
5-7-3. Adjustment
Read amplifier gain adjustment
a. If the peak-to-peak value of the "2F" Read
signal output is other than 0.6 ± 0.2 V
(_0.35 ± 0.15 V), set the output
signal at 0.6±0.05 V ( _ 0.35± 0.15 V)
by adjusting RV}02 on the FC-9/FC-14
Mounted Board with an adj rod tool.
_ b. If the peak-to-peak value of output wave-
form for "2F" in item j of the above is not
o •
35:!:O
.15V~ replace the head carriage ass'y.
(Refer to 4-14)
c. Perform the Head compliance adjustment.
(Refer to 5-3)
-48-
Read amplifier off set adjustment
lED
a. If any jittery pulses follow the triggered
one, stop jittering at the pulse edge as far
as possible by adjusting RV103 on the FC-
14 Mounted Board with an adj rod tool
_
b. If the pulses are issued from side 0 or 1 at
any interval other than 2.0 ± 0.2 Jlsec, set
the pulse interval on both sides 0 and 1 at
2.0 ± 0.2 Jlsec by adjusting RVI03 on the
FC·9 Mounted Board with an adj rod tool
c. If adjstment of a and b above does not sat-
isfy the spec, FC-9/FC-14 Mounted Baord
must be replaced. (Refer to 4-1)
NOTE: After completion of the read amplifier
gain adjustment, perform the read amp-
lifier offset adjustment.
RV103
RV102
Shield Plate
Fig. 5-7 (d) Read Amplifier Gain and Off set Adjustment
5-8. DISK DRIVE DC MOTOR SPEED
5-8-1. Tools and Measuring Equipment
a. MFD Checker II
lED
b. Level Disk (OR-D46V
AJ
_ c. Level Disk (OR-D46WA)
d. Universal Counter
5-8-2. Measurement
a. Connect the disk drive to the MFD Checker
II. (Refer to Fig. 5-8 (a) )
b. Insert the level disk in place.
c. Move the head until it arrives at TRK 35.
d. Connect the universal counter probe tip to
TP-5 on the MFD Checker II.
e, Check if the pulses are generated every·} 00
± 1.5 msec.