Allied Radio KNIGHT 96-499 Handmatig - Pagina 8

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Control
Knob
and
Shaft
Turns Bu!Mechanism Fails
To
Run
1.
Motor
transfer
lever-(41) loose
on
shaft.
Readjust
as
described under
'r
Motor Transfer
Lever".
Mechanism
I'ails
to
Run
in
Fast
Forward -
1. Check
drive
belt
(4?)
to see if it is
properly
connected.
2.
Mechanism
control
(1)
not
in the
Play-Record
position.
The
mechanism must
be
in the
play-Record
position before
power is
supplied to
the motor
and
also for
the drive putley
(5?)
toengage
the
capstan
which
in turn drives
the
fast forward pulley
(48).
SIow Speed
-
1.
Low operating temperature.
2.
Head
pressure
too great.
See'?Head Pressurerr
adjustment.
3.
Flywheel
(40)
shaft
binding.
Check
to see that
the
screws holding
the
mounting
plates
(20) and
(b0)
to-
gether
are tight
and
that
the plates are
not warped.
4.
Motor shaft binding. Realign bearings
by
tapping
lightly
on
the motor.
l\fachine
Will
PIay
Back
but
Does Not
Record
-
1.
Defective
microphone.
2.
Defective Record-Playback
head
(12).
3.
Defective
Amplifier.
High
Background
Noise (Hiss)
-
1.
Defective bias
oscillator
tube
or circuit.
2.
Defective
tape.
3.
Defective Record-Playback
Head.
4. Record
head
magnetized. Demagnetize
with
60
cycle AC
air
core coil.
Incomplete
Erase -
1.
Erase voltage
power
too
low.
2.
Erase
head
(13)
open.
RepLace.
3.
Record
head
lamination
dirty.
Clean
with
carbon
tetrachloride.
4;
Record head
(13)
not
making
proper
contact with
felt
pressure pad (11A).
See
"Head Pressure"
ad-
ju.stment.
Poor Recording
-
1.
Record-Playback
head
(12)
not at
right
angle
to
the
ta-pe.
See
"
Head
Alignment"
adjustment.
2.
Overloading
during recording.
3.
Defective
or
damaged
head.
4.
ilead lamination
damaged
or worn.
5. Felt
pressure
pads
(11A)
worn
or
missing.
Replace.
6.
Head
pressure
too
light.
See
"Head
Pressurerr
adjustment.
irage
B