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X. TROUBLE
SHOOTING
CHART
SECTION
''A'' TROUBLE
WITH AMPLIFIER
1.
Playback
problems.
(Unit
set
to play
position.)
Silicon diode (SW05-02)
No sound from Line-out jack
or R4-1KQ (2W) defective
No B (+), voltage supply
Playback amp. card and
+
l
ete
B (+), voltage supply
socket loose connection
P-10, J-10 loose connection
Check transistors
(TR-201, 202, 203 and TR-204)
Playback head coil open or lead wire loose
Silicon diode (SW05-02),
.
'os
a
Sound, but volume insufficient T. (+), voltage low
R4 (1KQ) Cl (470uF), C2 (1000uF)
B (+), voltage normal
Dust adhering to head ———————
-~
transistors (TR-201, 202, 203
and TR-204)
Hum
is decreased if playback
head is grounded
Hum
bucking coil out
Loud hum
insulation defective
No change even when
of adjustment
Playback head shield or
Cl (470uF), C2 (1000uF) defective
Inductive pick ae
ieccin the recorder
Change the set position of the recorder
Irregular scratching or
Playback card and socket
crackling noise
loose connection
Transistor (TR-201, 202) defective
Squeaking noise
Tape itself defective
ee
is magnetized
Tape itself noisy
Noise present
Not caused by tape—————"_
—_ ——— Transistors (TR-201, 202) defective
|.
adhering to head surface
Back tension weak
Poor contact between
head and tape
Lack of treble
Head angle incorrect
Re-adjust head angle
Head worn out
Replace
Tape itself defective
Sound distorted
Dust adhering to head surface——————
oss transistors
———__———- Replace
Head worn out
Replace
Clean the head
Replace
mas
(itis adhering to head surface
Replace
Adjust
Adjust
—-~— Replace
Clean
ee
Readjust
Replace
Adjust
———
Replace
Adjust
Replace
Clean
Replace
Demagnetize head
Replace
———-Replace
Clean
Adjust tension of
supply spindle
18
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