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Trouble
*Cannot record or playback.
*Can playback
but cannot
record.
Indicator works
Erasing insufficient
*Can record but cannot playback.
*Statics & Noises.
*Increased
noise
in recording
with
microphone.
*Inferior tone quality
*Insufficient
high tones
*Tones too high.
*Cannot
erase.
+Mixing
of recorded
materials
of
tracks
1 and 2.
+*Lack of volume.
Cause
Repair
*Bad of amplifier (incl. Power output transformer).
*Bad of recording/playback
head, sealed
lead wire connection.
(Bad R42).
*Inadequate
contact
of tape and recording/playback
head.
*Inadequate
function
or contact of Slb.
*Insufficient contact of RP switch.
RP
switch
does not function
or bad contact.
*Bad microphone jack or input jack.
*Bad electrical circuit. (R22, C10, R21)
*Bad of bias oscillotion
circuit.
(Especially
R45, C26)
*Broken
wire in OPT
3rd stage coil.
*Broken wiring of erasing head or R43
*Bad RP switch, or bad contact.
*Bad speaker or its wiring
broken.
*Insufficient
contact of EXT
SP jack.
*Broken
wiring or short circuit of power
output transformer.
*Bad contact of VR.
*Bad of transistor.
(Particularly
TR-1)
*Deterioration
of circuit element, contact
with adjacent clement,
insufficient soldering,
*Magnetized
RP head.
*Distortion
of bias oscillation
wave.
*Inadequate
grounding
of printed circuit plate.
*Bad microphone.
*Insufficient
insulation of C2.
*Insufficient capacity of filter circuit (C1, C8, C16)
*Bad of circuit element
or transistors.
*Inadequate AC bias.
*Inadequate contact of tape head.
*Worn
down
RP head.
*Bad microphone.
*Bad speaker.
*Inadequate
RP
head angle adjustment.
*Inadequate value of AC bias value.
*Capacity of C28, R14, VR1,
C18,
C19 too large, and resistance
value insufficient.
*Lack of capacity of C10.
*Lack of pressure of RP Head pad.
*Lack of capacity of C4, C7, C15, C17.
*Broken
wiring of tone circuit, R14, VR1, C29; C36.
*Inadequate position of erasing head.
*Insufficient
contact of erasing head and tape.
*Lack
of erasing current.
*Broken
wiring or short circuit of erasing head.
*Inadequate
position of tape guide, or vertical movement
of tape
that tilts the head.
*Inadequate
positioning of head for upper and lower tracks.
*Deterioration
of. transistors or circuit elements.
Short circuit, broken
wiring or insufficient
soldering of circuit
elements.
(Especially
emitter circuit, pass condenser
bad)
*Bad
bias oscillation circuit.
*Bad head, microphone or speaker.
Check
voltage of each
part, repair.
+ Check
mechanism
of
switch.
| Check
each
element
and
wiring.
| Check,
repair.
, Check
mechanism
of
switch.
Connect
earphone
to
EXT
SP jack and
check.
Repair, replace.
é
Check
indicator
to see °
if needle
swings in
recording.
' Check,
replace.
| Check, replace.
Check.
| Check,
erase
magnetism.
Check and adjust
circuit
element.
Check,
repair.
Check,
replace.
Check, replace.
Check, replace.
Check
voltage & amp
ere of each part.
Check
bias current.
' Check
loading of tape,
| contact points and clean,
Check,
replace.
: Check, replace.
' Check, replace.
| Adjust so that RP head'
! slit is perpendicular
|; to tape.
Check, ad just.
Check, adjust.
Check, adjust.
Check,
repair.
Check,
repair.
Adjust position.
Clean.
Check
DC erasing
current.
Check, replace.
Adjust tape
guide or
height of head.
| Check
voltage &
ampere
of each part.
Check,
repair or
replace.
Check,
repair or
replace.
Check
repair or
repalce,
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