C.E.C. ST630 - Troubleshooting

3.
Connect
the
D.C.
voltmeter
between
TP1
and
GND
ter-
minals
on
Control
PWB
Assy
(65)
(Fig.
23).
4.
Slightly
loosen
the
two
Screws,
(203)
and
(205),
which
fasten
the
Phono
PWB
Assy
(Fig.
24).
5.
Turn
the
adjusting
boss
with
a
screwdriver
so
that
the
volt-
meter
shows
-1.6
~
-2.0
volts.
6.
Disconnect
the
D.C.
voltmeter
and
re-connect
it
between
TP2
and
GND
terminals
on
Control
PWB
Assy
(Fig.
26).
Control PWB Assy
—
repeat Gye Start
Figure 26
stop
7.
Without
placing
the
turntable
platter,
press
the
START
button
so
that
the
tonearm
starts
moving.
8
Press
the
CUE
button
so
that
the
tonearm
lifts
after
stylus
set-down.
9.
Turn
the
Variable
Resistor
(VROO2)
with
a
screwdriver
so
that
the
voltmeter
shows
-1.9
~-2.1
volts.
10.
Press
the
CUEING
button
so
that
the
tonearm
descends
and
press
the
STOP
button
for
tonearm
return
to
its
rest.
11.
After
above
adjustment,
make
sure
to
apply
“STYLUS
SET-DOWN”
adjustment
(ADJUSTMENT
E,
page
7
).
(E)
STYLUS
SET-DOWN
POSITION
1.
Remove
the
Cabinet
top
according
to
DISASSEMBLY
IN-
STRUCTIONS
(B)
(page
3).
2.
Press
the
POWER
button
so
that
the
unit
will
be
switched
on.
3. Place the turntable platter and mat.
4.
Use
the
first
face
of
NEC
test
record
ES-1008
for
this
adjustment.
Press
the
START
button;
turntable
starts
rotation,
the
tonearm
will
move
and
descend
onto
a
record.
5.
Turn
the
adjusting
pin
described
in
Fig.
27
so
that
the
stylus
set-down
position
will
be
counted
between
15
and
17
points.
6.
Using
the
second
face
of
the
test
record
ES-1008
make
sure
that
the
automatic
return
position
will
be
counted
between
19
and
22
points.
NOTE:
After
the
above
steps,
no
adjustment
for
17
cm
records
is
required.
However,
to
settle
the
speci-
fied
counting
position
by the
first
time
adjustment
may
be
difficult.
Apply
several
times
adjustments
to
confirm
the
above
specified
position.
(F)
PITCH
ADJUSTMENT
OF
STYLUS
SET-DOWN
POSITION
After
fundamental
adjustment
mentioned
above
(E),
pitch
adjustment
of
stylus
set-down
position
is
available
without
removing
the
Cabinet
top.
ee]
. Place the unit upside down on a suitable bench.
2.
Stylus
set-down
position
can
be
adjusted
by
rotating
the
cam
through
the
hole
which
is
marked
in
Fig.
2
with
a
slotted-
head
screwdriver.
.
3. Counterclockwise turn moves the set-down position inward;
clockwise turn moves the set-down position outward.
Plate PU Assy
Adjusting rm /
Figure 27
6. TROUBLESHOOTING
(A)
THE
STROBE
LIGHT
DOES
NOT
TURN
ON
Measure
the
voltage
between
4
and
5
terminals
on
Power
PWB
Assy (70) with A.C. voltmeter.
* Local voltage is supplied: (R501), Neon Lamp (71-2) or
Lead-wire is defective.
* Different voltage from local one or no voltage is supplied:
Power Cord (73), Power Switch (SW501) or Fuse (70-2) is
defective.
(B) THE RECORD SIZE SEARCHER LIGHT DOES NOT
TURN ON
Measure the voltage between GND and each +9 volts terminals,
(J10) and (J12), on Control PWB Assy (65) with D.C. volt-
meter.
* Approx. +9V is supplied: Measure the voltage between 1
and 2 terminals on Position PWB (69-1) with D.C. volt-
meter .
* Approx. 18V is supplied: Lamp (78) or Lead-wire is
defective.
* Too short voltage is supplied: Cord Assy 6P (69-2) or
connector is defective.
* Quite different voltage from +9V is supplied: (Q001),
(Q002) or (Q003) is defective.
* Quite different voltage from -9V is supplied: (Q004),
(Q005) or (QO006) is defective.
(C) THE TURNTABLE DOES NOT START ROTATION
AFTER PLACING THE RECORD
Check to see that the base-voltage at (0019) is approx. +9V
when tonearm returns to its rest upon STOP button being
pressed, and the voltage is lowered by approx. 0.6V upon
START button being pressed.
* Yes: (0033), Cord Assy 7P (65-3) or Direct-drive
Motor (77) is defective.
* No: (I1C0O03) or (R044) is defective.