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Sy-ptom
Check Point
3-1.
Troubleshooting on
Power Supply Section
1.
No poweÍ supplied
to
each section (Power
lamp not
lighQ
3.
TROUBLESHOOTING CHART
(Notices when servicing this unit)
oon tight
Emitted
Diode
(tED)
The
LED
used
as
Pilot Lamp driven
by
constant
cur-
rent
has
characteristics
of
extreme
low
reverse
break-
down voltage (DC 3V) and also
it
would be
easily
influenced
by
discharge
voltage
from
capacitors
in
power amplifier
section.
Therefore,
after power switch
is
turned
OFF
and
lapse
of
a
few
seconds,
perform the
replacement
of
LED.
oNotice when replacing
lC
1)
Do not vent the
leads
of
lC
more
than
3 times.
2)
When
using
a
soldering
iron,
lC
should
be
absolute-
ly
isolated
from current
leakage
of
the iron.
ln
order
to
protect
lC
against
break-down, connect
a
lead
wire from the iron
to
ground
(chassis)
as
shown below.
(Fig.
3-1)
1-1.
AC+30V not supplied to terminal
@
on
F-2200
1-2.
AC
+
30V
supplied
to terminal
E
on
F-2200
+45.5V not supplied
to terminal
@J
on
F
-2200
+45.5V
supplied
to
terminal
E
on
F
-2240
3-2.
Troubleshooting on Audio
Section
"1.
Quick
acting fuse open
1-1.
{fter
replacement,
f
use
open
again
|
-1)
DC bias
current
is over
5omA
1-2. After
replacement, fuse
not
open
I
r)
DC bias
current
is
not between
30mA
and
50mA
2.
AUX inoperative
@
on
F
-2400
on
F
-2400
3.
PHONO inoperative
3-1.
Excessive
Distortion
F
ig.
3-1
to
chassis
soldering
iron
lead wire
3)
As
lC
is extremely
weak
against
heat;
use a
solder-
ing iron
as
shorter
as possible.
oNotice after replacing power
lC
After
replacing
power lC, check DC bias
current
(30mA
^.,
50mA)
on power
amplifier
section.
If
the
value
is
under 30mA
or
over
50mA,
the IC
must
be
replaced
again because
it
may
be probably
caused
of
troubles
again.
Cause
& What
to
Do
1.
lmperfect contact
of power supply
plug
2.
Defective power switch,
S05e
3.
lmperfect contact of
voltage selector,
PU701
4.
Power fuse
F70'l open
5.
Defective power
transf
orm er,
T701
6.
Defective
D601, D602
on
F-2240
7.
Defective
LED701
1.
Defective
lC01
(1C02)
on
F-2200
2.
Defective
lC01
(1C02)
on
F-22A0
3.
Defective power supply
section
(F-2200)
4.
Imperfect
contact
of
SELECTOR
switch
S01
(K,
I)
5.
lmperfect contact
of
TAPE
MONITOR
switch
S01
(m,
n)
6.
Defective
lC03
(1C04)
on
F-2400
7
.
Im
perfect contact
of
SELECTOR
switch
S01
(e
^, h)
B.
Defective
lC01
(1C02)
on
F-2400
9.
lmperfect contact
of
SELECTOR
switch
S01
(f)
1)
2)
2-1.
+45.5V not supplied
to
terminal
2-2.
+45.5V supplied
to terminal
@
lm
perfect
(a
^, l)
lm
perfect
contact
of
SELECTOR
switch
S01
contact of MIC
Jack
4
4.
MIC
inoperative
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