Akai 1710W

B. Recording problems.
(Unit
plays
back
pre-recorded
tapes
okay,
but
recording
not
satisfactory.)
9. No recording possible.
[
VU-neter
does
not
read
on
record.
Defective
microphone.
:
4
Check
and
replace
microphone.
Input jack does not keep good contact. -}——_| Check and readjust input jack.
REC/PLAY
rotary
switch
does
not
function
Check
record
lever
which
actuates
properly.
rotary
switch.
Defective
record/play
head.
Check
record/play
head;
replace
if
necessary.
Defective C6,C7,R10,R11,C12,R17. Check and replace.
Broken lead wire in recording cirouit. -——_ Check lead wires and repair.
VU-meter reads okay on record.
10. Sound distorted.
VU-meter functions normally; record-
ing monitor through external earphone
also normal
:
: ;
Measure
recording
bias
voltage.
Check
Faulty
recording
dias
circuit,
|__|
V4
Li
Clz
Ri?
—
Faulty
constant
current
circuit.
Excessive
recording
input
level.
REC/PLAY Rotary switch does not
function properly.
A h ae
Defective microphone or defective Check and replace.
external amplifier.
L+VU-meter
lost
sensitivity.
Replace
VU-meter.
Check C6, C7, R10, R11.
Lower recording input level by
volume control.
Check record lever which actuates
rotary switch.
VU-meter functions normally but re-
cording monitor through earphone
abnormal.
11. Hrasing problems.
Unit does not erase at all.
[|
Defective
C14,
and
12.
Check
C14,
and
L2,
also
measure
erasing({bias)
voltage.
Defective
erase
head.
Check
head's
coil
with
tester
and
replace
head if coil burned out.
L|
Broken
lead
wire
in
erasing
circuit.
——
Check
lead
wires
and
repair.
Incomplete
erasure.
Dirty
head
surface
Clean
heads.
p7__Biasing
bias
voltage
not
high
enough.
Check
C14,
L2.
i
Head
coil
being
shorted.
Check
and
replace.
12. Insufficient treble on recording.
Dirty
head
surface
Clean
heads.
[
Recording
bias
voltage
out
of
adjustment.
Check
bias
voltage
with
VIVM
(Vacuum
Tube
Volt
Meter)
and
re-adjust
to
regular
voltage.
Worn-out tape heads. — Replace head assembly.