BB
N
N
N
N
Function
trouble (No disc 2)
Focus
is
normal
?
Check
if
the
A
、B、
C、D、E、F、signal
is normal for U5
C h eck
t h e
circu i t
b e t w e en
U 5
Check
the
p e r i p h ery
circuit
f or
U 5
Signal
F E O
i s
correct
OK
Y
Y
Y
Y
Y
Y
N
N
N
N
Y
N
Spindle
on
is
normal
？
Check
the
SPDCO
driver
IC
is
normal
?
1
、
Checd
the
ciruit
between
U5
and
U6
2
、
Checd
the
Periphery
circuit
for
U6
Checd
the
reference
voltage
is
normal
for
VREF1
\
VREF2
?
1
、
Checd
the
periphery
circuit
for
VREF1
\
VREF2
2
、
Checd
U5
and
pin114
\
pin115
for
U6
Check
the
spindle
driver
motor
voltage
is
normal
?
Check
the
SPDCO
signal
is
normal
?
Check
the
periphery
circuit
for
U5
Check
the
periphery
circuit
for
U6
Check
the
SP
+\
SP
-
signal
is
correct
?
Check
the
circuit
between
spindle
driver
motor
and
U6
5.4.
