JVC JL-F50 User Manual

8-(2)
Chart
1.
Platter
does
not
rotate
Platter does not rotate.
Is +18V
present at the
emitter of
X101?
Yes .|Replace the
fuse.
Is neon lamp on? Yes
Is the fuse blown?
Is AC26V
present at second-
ary transformer
ace may be disconnected.
terminals:
Yes
Is 18V
present at the
base of X101?
Yes
X101 may be opened.
Gold plate wire used
if head shell ass’y is
purchased.
Does platter
rotate when
collector and
emitter of X13
are shorted?
X11 or X13 are defective.
No .| Transformer or lead wire
Yes
Is current
available at the
terminal on
motor circuit
board?
No
Fuse (0.5A) may be dis-
connected or C805 may
be shorted.
Check X13.
If it isn’t
defective
Yes
Check D5,6,7 and
D11 which pro-
Is 0.4Vp-p
Is the Se ee output available
speed selector Short circuited between between S1~4 respectivel
micro switch Yes collector and emitter of and earth when a revolution
normal? x9. roughly corresponding
to 33-1/3 rpm is
| given to the
Rotation at a high speed. platter?
; No
t Transistors X1 through
oO
mally.
Micro switch or its lead
wire and socket may be
poorly connected.
No
Replace X9.
Is 1.8Vp-p
waveform available
at the bases of X1,2,3
and X4?
Yes
duce standard vol-
tage or check if
standard voltage
2V is present at
the base of X13.
Replace the transistor(s)
that have no voltage.
wre: ac gee
Does platter
rotate when the
collector and emitter
of X10 are
shorted?
X8 are operating nor-
When no output is available,
resistor R12 or R13 may be dis-
connected. When output is
available at either one of the
terminals, Hall elements may be
defective or their connection
terminals may be disconnected.
Yes
Does platter
rotate when the base of
X11 is earthed?
X10 or X11 are defective.
Is 5Vp-p
drive wave
available at the
collectors of X1,2,3
and X4?
Replace the transistor(s)
that have no voltage.
| JL-F50
Yes
Motor wire or coll
may be disconnected.
No. 2411
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JVC JL-F50 Specifications

General

Brand	JVC
Model	JL-F50
Category	Turntable
Language	English