Advertisement
SOlenOid
DOeS
NOt
ACtUate
PfeSSUfe
ROllef
2.
Moverecorder awayfrom
hum
fields
such
as
(44)
ln
ttPlay''
0f
trReCOfdtr
fluorescent lamps,
amplifiersl
etc.
t.
rf
usingremotecontrols,checkremoteswitch
Microphonic
Howl
lnttPlaytt, But
Dies Out
and
cabte
conttections.
When
Volume
ls
Lowered
1.
Try different
12AX?'s in
preramplifier
stages.
2.
Check
on-off-switch
(M11)
and
fuse
(M10).
B.
check ,,stop,,key
microswitch.
No
Erasg
Records
Over
Previous Recordings
4.
Check
fiber arm
on ,,stop,, key
blade of
push
-,^^,,1'
Check
for dirt
on erase head element
and
check
pressure
pads.
Dutton
swrrcn
-
z.
check bias-erase
oscillator coil
(L2) second-
5'
Check
mechanical linkage
for
binding'
aryrorgov@ ?oKc.
check
oroct(v5)biasoscillator.
6.
check
solenoid'
3.
check
erase
coil for
open
or
short.
Records-Background
Hum,
Hum Lower
0n
Pre-Recorded
Tape
F[t
TV
0r
Amateur lnterference
1. Checkallstagesafterthefirstand6K6GT,(V5)
Thisis
heard
as a raspy.unsteady buzz
orcross
forcathode
toheater leakage,also check(Cl)
and(C2).
modulation
by
voice
o"
*uJi".
eal
""fOXO
i7i*"tt
2'
Record
fromanother microphone
etc',to
see
ly
between
tube socket
gridlerminals
and
other input
whether
hum comes
from
an outside
gource.
components.
3.
Adjust "Record
Humt'
control
(R2)
{or
mini-
NO
SOUnd,
l,,leOn
LampS
FlaShing
With
Signal
mum
hum
with
t'Stop" and
"Speaker" keys
down.
Hum
ln
Playbaclg
FallS Off
With
Decrease
ln
1.
Check
speaker switch.
Volume Control
2.
Check
transformer (T2)
secondary
for
open.
1.
Check
first
stage
of
12AX7
(VlA).
Adjust
'rPlay
Hum'control
(R3)
for
minimum
hum.
3.
Check connecting
cables,
jacks, plugs,
etc.
AUXILIARY
PARTS
LIST
A173-5
Microphone
PIug
4196-10
Hi-Fi
Connecting
Cable
A196-8
Attachment Cord
Assembly
8195-4
Power Cord
Assembly
TRA-1102
Accessory Adapter
Cord
A195-3
Hand
Switch
Cord
TR-2601
Replacement
hessure
pads
Figu
re
7.
Bottom
Vlew
0f Amplifier.
Page
12
Advertisement
