JVC L-F66 User Manual

8.
Troubleshooting
Charts
9-(1) Turntable does not rotate
The
turntable
does
not
rotate.
Does 24V
DC appear
at the motor base
Check the connection of R21,
When a shorseiccult to see whether X13 or X15
is made between the collector
{between the positive
and negative
terminals)?
Does the
voltage appear
at the emitter
of X814?
Does the
voltage appear
at the collector
of X814?
Does the
AC voltage appear
between Pins
1 and 2?
Check the soldered points of
the connection cord and the
power board, to see whether
the connection cord is in con-
tact with the power board, etc.
Check whether X812 or -
X813 is open or short-
circuited, whether D805 is
short-circuited, whether
D805 or R853 is disconnect-
ed, etc.
If anything is defective
replace it.
Check whether D806 is open,
whether the printed pattern
is cut, etc.
If anything is defective
replace
Check the fuse of the pri-
mary winding of the trans-
former, the connection of
the transformer, the solder-
ed points of the AC cord,
etc. If anything is defective,
replace or repair it.
————— |
is open, or whether something
is causing the base of X14
to be grounded...
and emitter of X13, does the
turntable rotate?
When a short-circuit
is made between the collector
and emitter of X12, does the
turntable rotate?
Check to see whether X12 is
open, or whether the printed
pattern is cut, etc.
Check to see whether X11 is
open, or whether the printed
Pattern between the collector
of X12 and the base of X11
is cut, etc.
When a short circuit
is
made
between
the
collector
and emitter of X11, does the
turntable rotate?
Does the
output appear
between the bases of
X5 and X7 or between
the bases of
X6 and X8?
Does the
turntable
rotate
by hand?
Does the
output appear
either between the
bases
of
X5
and
X7
or between the
bases of X6
and X8?
Any of X1 - X8 may be
defective.
Or check the connection
of the drive coils.
Check
the
connection
of
R2-
R5,
ete.
Is the
connection wire
of the speed selecting
circuit
dis-
connected?
Does the
record rotate
either at 33-1/3
or 45 RPM?
Yes
Does the (one
changeover
switch have
a contact
failure?
Check to see whether CS is
short-circuited, or whether
a short-circuit is made
between the collector and
emitter of X17.
Check the HG between those
bases between which no
output appears.
|
Replace the
connection
wire.
Replace the change-
over switch,
R31 or R32 is defec-
tive. Or check to see
whether the connec
tion cord is dis-
connected.
‘No. 2526

JVC L-F66 Specifications

General

Brand	JVC
Model	L-F66
Category	Turntable
Language	English