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SYMPTOM
(CH-1).
Reproduces but doesn't
record
(CH-1,.
CHe2).
a) Indicator doesnt
work,
|
b) Indicator
is normal.
d) Confused
recording (confusion
of CH-1
and
CH-2)
Records
but doesn't
reproduce
(CH-1, CH-2).
|
CH-1
(or CH-2)
records and
reproduces, but CH-2 (or CH-1)
|
doesn't reproduce.
Noise
(CH-1, CH-2).
Much
noise only in Ch-1
(or CH-2):
Bad tone
(only one
channel).
| Lack of high tone
(only one
channel).
Lack
of low tones.
Unable
ta erase.
Cross
talk between
top and
| bottom
tracks.
Poor
volume.
Much
hum.
—-
WNHKN—
PWN
F GON
wont
ws
NO-
— £& WN
- — "NI
oO
ON
& W
. Defective
. Defective
. Defective
. Magnetized
erasing head.
. SP head
phone
failure.
. SP, headphone, end line out jecks defective.
. Biasing
oscillator
wave
distortion.
. Defective motor.
. Megnetized
RP head.
. Defective contact VR 1-1, 1-2, 1-3 Cor VR 2-1,
MARWONHARWN
|= PWN
CAUSE
Defective
amplifier.
. Defective
SP head
phone
jacks.
. Short or broken leads ketween
head and amplifier.
. RP select switch
failure or wrong
contact.
. Defective
indicator
or indicator
circuit.
. Defective
microphone.
. Microphone,
Aux.
jacks failure.
. Failure or short of constant current (R-25 or R-75).
. Defective
. Defective
. Defective
oscillator
circuit.
erasing
head.
adjustment
of RP head
angle.
select switch
or poor
contact
select
switch.
SP, head
phone.
iacks of Sp,
head
phone
and
line out.
210 05)
. Detective transistor
(especially TR 1-1 cr TR 2-1)
. Defective
circuit elements.
;
. Contcect
among
elements
on CH-1,
or ce'ective
soldering.
. Lack of capacity in filter circuit (C 105, C 106,
Ge 107:
. Lack of capacity in filter circuit
(C2, C10, or
C52, C10).
. Bad
earth.
. Defective
microphone.
. Bad insulation of Cl
Cor C51),
. Bad
circuit
elements
or
transistors.
Inadequate
AC
bias.
. Worn
head.
. Bad
microphone.
Bad
speaker.
. Bad
angle
of RP heads.
. Inadequate capacity of C12 <or C62).
. Inadequate capacity of C15 (or CéS).
. Excessive capacity of C19, C21
. Not
enough pressure
of RP heads
pad or dust
(or C64, C71).
adheres
to slit part.
. Bad
speaker.
.
. Inadequate operation of AC bias oscillator circuit.
. Inadequate capacity of C7,
C6, R14
(or Cé7,
R64, C56).
. Erasing
head
broken
or short.
. Bad position of erasing head.
. Lack of erasing
current.
. Bad
contact
of tape and
erasing
head.
. Bad position of tape guide and wobbling of
tape.
. Defective
circuit elements
. Bad
circuit
elements
or poor
contact
with
adjoining elements and defective soldering.
. Defective
biasing
oscillator
circuit.
. Defective
head,
microphone
and speaker.
. Defective contact of RP heads with amplifier.
. Close arrangement of RP lead wire.
. Defective
wiring
of RP heads.
. Small capacity in smoothed
circuit of amplifier
C10, C106, C107 (or Cé0).
. Defective
earth circuit.
REMEDY
Check and replace.
Repair or replace.
- Repair.
Repair or replace.
Repair or replace.
Replace.
Repair or replace.
Repair or replace.
Check and repair.
Check and repair.
Check and repair.
Repair
or replace.
Replace.
Repair
or replace.
Demagnetize
or
replace.
Replace.
|
Repair
or replace.
Adjust circuit.
Repair
or replace.
Demagnetize with demagnetizer.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
| Repair.
Replace.
Replace.
Replace.
Adjust.
Replace.
Replace.
Replace.
Adjust angle with standard tape at 7,000 c/s. |
Repair.
a
Repair.
Repair.
Repair or clean.
Replace.
:
Set 200 mA of AC. bias current.
Replace.
Replace.
Adjust erasing head position.
Repair.
Clean,
Adjust tape guide and head position.
Check
and
replace.
Adjust or replace.
Check and repair.
Check
and
replace.
Check and repair.
Move as far as possible.
Move
motor away
from AC cord
and fix
appointed position.
Check
and
replace.
Check
and
repair.
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