Check Points To Abnormal Operation - Sony MP-F17W Service Manual

3-3-2 Check Points to Abnormal Operation
Abnormal OperatioD Check Point
Steo
for eacb step
(defectigeplacel
Normal SUtus
Power
en
1. The Disk Motor rotates.
1. Disk Motor system. The both signals of
IC101-63
(XCIN)
and
ICIOI-27
(XMON)
are
High level.
Drive Select 1.
The ItF indicators are 1. Drive Sclec t circuit The signal of IC101-28
put out for the selected system. (XSEL) is Low level.
canbination, or they are 2. IC101 The signal of IC101-35
lit for the unse1ected (XLED)
and
CNl-3
canbination. (XLEDON) are low
level.
Stepping 1. TRKOO indicator does not
1. TRKOO sensing IC101-9 (XCTO) is Low
light, when the head is circuit.
level, when the head is
located on lRKOO. set to TRKOO.
2. The step operation does
1.
Stepping motor drive The signal of IC103-13
not fuhc tion at all, or system or stepping is Low level during
it
is not smoothly motor itself. step operation.
functioned. 2. IClO3 The both signals of
CNlO2-1 and CNI02-Z
are High or Low level.
Motor Rotation 1. The disk motor does not 1. Disk motor
drive ICl-12 is supplied dock
rotate. system.
(491KHZ).
IC 1-21 is supplied +5V.
The signal of ICl-7 is
Low level.
2. Sane I/F indicators do
1. ItF signal circuit is
not light. defective.
0!iRST 1. The DSKCHi
indicator
1. ICI01
The signal of ICI01-13
does not go out.
is Low level.
Motor Speed
1.
Motor speed does not 1. XI0l
meet the specification.
2. Motor speed is abnormally 1. Disk motor drive The pulse signal can be
fas
t.
system. obtained
at
TP-4
(FG)
on the Fixture-lO.
Index Position
1. The
shit ted
positions 1. The inde:.: phase is
however do not meet the mis-adjusted. (R efer
sped ficacion.
to 5-3)
2. Offset value is lOOl.lsec 1. Head Carriage Ass'y.
or more.
(R
ef
er to 4-9)
Cassette out
1.
\\ben the disk is ejected. 1. ICI01 or S2 The signal of ICI01-63
the
DSKCi:i
indicator is High level and ICI01
does not light. -33 is Low level.