Broadcast Electronics SPOTMASTER 1000 Series User manual
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TAPE
CA
RT
RIDGE
MAClllNF.
Sectlon
1.l
t.
2
t.3
1.4
Section
2
2. 1
2 . 2
2 . 3
Section
3
3 • I
3
.2
Section
4
4.l
4
.2
4. 3
4.
3 . l
4 . 3 . 2
4.3.3
4 . 4
Sect
i
on
5
5 . l
5 . 2
5 . )
5 . 4
5 . 5
5. 5. 1
S. 5 . 2
5. 6
5 . 7
Sect
i
on
6
6 . t
6 . 2
TAHLE
OF
CONTENTS
lntroductlon
Ge
ner
a l
Descript
i on
and
Fe
atures
Spec
i
ficat
i o
ns
W
arranty
Se
rvi
ce
Installation
Unpacking
Audio
Output/I
nput
Con
ne
ct
i o
ns
Mic
rophone
In
pu t
Operation
Playback
Record
Maint
e
nance
Routine
Cleanin
g
and
Adjustments
!lead
Alignment
Deck
Adjustments
Roller
Perpend
iculari
ty
Push
Link
Assembly
Screw
Pressure
Adju
s
tment
Tepe
Drive
Sys
tem
Servicing
Electronic
Adjustments
General
Considerations
Output
L
evel
Playback
Equalization
Cue
To
ne
Sensor
Level
Program
Record
A
djustment
s
Bl
as
Traµ
Tu
ning
Pr
ogram
Dias
Level
VU
Meter
Ca
l
ibration
Record
Equaliz
a
tion
Cue
Record
Adjustments
Cu€'
IHaR
Leve
I
Cue
T
one
Record
L
eve
ls
SERIES
10
00
P
age
1
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LIST
OF
DRAWINGS
AND
ILLUSTRATIONS
Page
1S
Page
16
Page
17
Page
18
C-
906-1101
C-915-1393
C-915-1390
C-
906-1102
B-906-2114
C-914-1391
C-906-2105
D-906
-
2109
Troubleshooting
Suggestions
Troubleshooting
Suggestions
Typical
Output
Connections
Typical
Input
Connections
Block
Diagram
Record
Module
Schematic
PC
Board
Layout
and
Parts
Playback/Logic
PC
Assembly
Playback/Logic
PCB
Mono
Schematic
Power
Supply
PCB
Schematic
Power
Supply
PC
Assembly
Motor
Mounting
Sub-Assembly
Deck
Plate
Assembly
Customer
Service
Warranty
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SECTION
1 INTRODUCTION
SERIES
1000
1.1
General
Description
and
Features
The
SPOTMASTER®
10
00
tape
cartr
idge
machines
are
designed
to
meet
or
exceed
the
National
Aeaociation
of
Broadcasters'
standards
for
tape
cartridge
recording
and
reproduction.
The
SERIBS
1000
machines
are
capa
ble
of
performing
a
variety
of
studio
assignments
and
still
stay
within
the
limits
of
the
most
conservative
budget.
Standard
features
include
the
1
kHz
stop
cue
tone
.
The
use
of
balanced
transformer
output
assures
quality
audio
signals
with
a
minimum
of
interferen
ce.
Quick
response--under
80
milloseconds--Start/Stop
times
and
a
noise
figure
of
54
dB,
well
above
NAB
standards,
make
the
SERIES
1000
machines
a
practical
piece
of
studio
equipment.
Table
top
unite
accept
standard
A,
8
and
C
size
cartridges.
The
dual
rack
mounted
configuration
accepts
A
and
B
size
only
.
1 . 2
Specifications
Noise:
54
dB
below+~
dBm
output
Frequency
Response:
-2
dB,
50
-
15,000
Hz
Distortion:
2%
or
lees
at
+16
dBm
output
Tape
Speed:
7.5
ipe
accurate
0.2%
or
better
Optional
3.75
ipe
accurate
0
.4
%
or
better
Wow
and
Flutter:
Lees
than
0
.2
%
RMS
(NAB
un-
weighted)
Output:
Peak
output
+16
dBm,
contin
u
ously
ad-
justable,
600
ohms,
transformer
bal-
anced
Start
and
Stop
Time:
80
milliseconds
minimum
Equalization:
NAB
standard
Drive:
Hyete
resis
synchronous,
indirect
Power:
117
VAC/60
Hz
standard
220
VAC/50
Hz
optional
117
VAC/50
Hz
optional
Cue
To
nes:
1
kHz
stop
etanda-rd
Dimensions:
5-5/8"
high
X
8-1/2"
wide
X
12"
deep
Options
Reck
Adap
tor:
Mounts
two
SERIES
1000
unite
elde
by
side
in
1g
11
rack
1.3
Wa
rranty
Broadcast
Electronics,
Inc
.
products
are
guaranteed
to
be
free
from
defects
in
workmanship
and
material
for
a
www.SteamPoweredRadio.Com
period
of
one
year
from
the
date
shipped
when
subjected
to
normal
usage
and
service.
All
warranties
are
void,
A)
If
equipment
has
been
altered
or
repaired
without
specific
prior
authorization
from
Broadcast
Electronics,
Inc.,
or
B)
If
equipment
is
operated
under
environmental
conditions
or
circumstances
other
than
those
~pecifically
described
in
the
appropriate
literature
or
instruction
manuals
pro-
vided
with
each
unit.
1.4
Service
The
Customer
Service
Department
ls
at
your
service
to
answer
questions
involving
Broadcast
Electronics,
Inc.
products.
Technical
assistance
le
available
in
your
area
from
the
local
franchised
dealer
or
you
can
write
or
call
us
direct
at
(301)
588-4983.
Our
address
is
on
the
cover
of
this
manual.
In
the
event
a
unit
must
be
returned
to
us
for
re-
pair,
please
make
arrangements
in
advance
by
contacting
the
Customer
Service
Department
or
your
local
dealer
for
return
authorl~ation
procedures.
Equipment
being
returned
should
be
sent
by
common
carrier,
prepaid,
insured
and
well
pro-
tected
as
we
can
assume
no
liability
for
inbound
damage
making
necessary
repairs
the
obligation
-0f
the
shipper.
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SECTION
2
INSTALLATION
SERIES
1000
2.1
Unpacking
Your
new
SPOTMASTER®
1000
'
will
be
ready
to
go
to
work
as
soon
as
all
protective
packing
material
has
been
removed.
The
carrier
has
assumed
all
responsibility
for
the
safe
delivery
of
this
unit
to
youi
therefore,
any
claim
for
damage
should
be
made
promptly
and
directly
to
him.
NOTE
Before
connecting
the
unit
to
a
power
source,
be
sure
the
clear
plastic
ty-rap
1
used
to
secure
the
motor
to
the
bottom
panel
during
shipment,
has
been
removed
and
discarded.
In
addition,
the
fuse
provided
with
each
unit
(attached
to
the
line
cord)
should
be
installed
in
the
rear
panel
fuse
holder.
2.2
Audio
Output/Input
Connections
The
unbalanced
phone
type
connectors
J-1
(Output)
and
J-2
(Input
-
record
models
only)
are
·
located
on
the
rear
panel.
The
mating
connectors
may
be
wired
for
either
balanced
or
unbalanced
operation
ae
shown
in
the
diagrams
on
pages
17
an~
18.
The
output
level
is
set
at
the
factory
for
a
nom-
inal
O dBm
level
and
is
designed
to
be
connected
to
a
600
ohm
load.
If
placed
in
a
higher
impedance
situation,
a
termination
must
be
provided
in
the
form
of
a
560
or
620
ohm
resistor
across
the
output
to
ensure
proper
frequency
response.
(See
diagrams
on
pages
17
and
18).
The
recorder
input
channel
provides
a
high
imped-
ance
for
high
level
(-20
to+
10
dBm)
line
signals.
If
a
600
ohm
transformer
coupled
device
is
connected
to
the
in-
put,
a
560
or
620
ohm
terminating
resistor
should
be
in-
stalled,
as
shown
in
the
diagrams
on
page
16,
to
insure
proper
frequency
response.
2.3
Microphone
Input
The
record
tnput
ie
set
at
the
factory
for
line
level
recording.
If
a
microphone
le
to
be
used,
the
fol-
lowing
terminals
wtthin
the
record
module
must
be
jumped--
Pin
11
to
Pin
12
and
Pin
10
to
Pin
13.
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SECTION 3 OPERATION
SERIES
1000
3.1
Playback
For
Playback,
begin
by
turning
on
the
AC
power
at
the
switch
located
on
the
rear
panel.
When
the
STOP
lamp
on
the
front
panel
le
lllumlnated
and
the
tape
drive
cap-
stan
is
rotating
and
pressure
roller
ia
in
release
position.
you
are
ready
to
inserts
cartridge.
Table
top
mounted
unlte
will
accept
alt
three
sizes
of
NAB
standard
cartridges
.
Because
the
C
size
(1200
Series)
extends
beyond
the
left
aide
of
the
machine,
it
cannot
be
used
if
two
unite
ere
mounted
elde
-
by-aide
in
the
dual
reek
adapter.
TO
PLACE
THE
TAPE
IN MOTION,
depress
the
START
switch
on
the
front
panel.
Only
momentary
preeeure
is
re-
qulred
as
you
observe
the
STOP
switch
lamp
extinguish
and
the
START
switch
lamp
illuminate.
3. 2
Record
To
Record,
begin
by
depressing
the
red
REC
switch.
The
tamp
in
this
switch
will
illuminate
indicating
the
unit
is
in
the
recording
mode.
Changing
to
the
re
cor
ding
mode
can
be
accomplished
only
after
the
unit
has
been
taken
out
of
the
playback
or
run
mode
by
depressing
the
STOP
switch.
Before
starting
the
cartridge,
preset
the
record
level
by
playing
the
material
to
be
recorded
or
speaking
into
the
microphone.
Adjust
the
front
panel
LEVEL
control
so
that
the
VU
meter,
which
le
active
only
in
the
record
mode,
indicates
a maximum O
VU
(100)
on
peaks.
When
the
level
le
set,
re-cue
the
material
to
be
recorded.
Start
the
SERIES
1000
unit
by
depressing
the
START
switch.
Then
start
the
material
to
be
recorded.
al-
lowing
a
1/4
to
1/2
second
lag
between
the
start
of
the
cartridge
and
the
start
of
the
program
material.
The
unit
will
stop
automatically
when
the
cart-
ridge
reaches
the
end
of
its
tape,
or
you
can
manually
.
halt
the
recording
at
any
point
by
depressing
the
STOP
switch.
(In
either
case,
the
unit
will
return
to
the
playback
mode
whenever
it
ie
stopped.)
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SECTION
4
MAINTENANCE
SERIES
1000
4.1
Routine
Cleaning
and
Adjustments
As
you
already
know
from
experience,
any
good
piece
of
equipment
will
last
longer
and
run
better
if
lt
is
given
regular
maintenance
attention
.
Your
SPOTMASTER®
SERIES
1000
tape
cartridge
machine
la
no
different.
Tape
heads
and
pressure
rollers
should
be
cleaned
daily
using
the
appropriate
head
cleaner
solution.
Tracee
of
lubricant
and
oxide
can
be
removed
from
the
capstan
and
pressure
rollere
with
a
cloth
that
has
been
dipped
in
alco-
hol.
Tape
heads
should
be
demagnetized
and
alignment
adjusted
(see
paragraph
4.2)
periodically
depending
on
machine
use.
4 . 2
!le
ad
Alignment
The
alignment
of
a
new
head
or
the
realignment
of
the
present
head
requires
two
adjustments:
tracking
height
and
azimuth
.
Check
the
tracking
height
of
the
reproduce
head
flret
and
then
the
record
head.
All
adjuetments
will
be
made
first
on
the
reproduce
head.
When
adjusting
the
tracking
height
and
azimuth,
final
turns
should
be
made
on
the
adjusting
ecrewe
in
a
CLOCKWISE
direction
so
that
the
spring
under
the
mounting
block
le
being
compressed.
A .
050
Allen
wrench
is
provided
with
each
unit
for
these
adjustments
.
To
check
the
tracking
height
of
the
reproduce
head,
remove
the
pressure
pads
ftom
the
cartridge
eo
the
tape
can
be
observed
as
it
passes
the
head.
The
top
can
be
left
off
the
cartridge
if
the
hold
-d
own
wlre
ie
glued
in
place,
or
a
section
may
be
c
ut
out
of
the
top
in
the
area
of
the
pres-
sure
pads.
With
the
tracking
cartridge
in
the
machine
and
the
tape
ln
motion,
observe
the
path
the
tape
travels
across
the
head.
Adjust
the
tracking
height
screw
until
the
top
edge
of
the
tape
just
covers
the
top
of
the
head
pole
piece
and
the
bottom
edge
of
the
tape
is
in
a
similar
position
in
reference
to
the
bo
ttom
·
pole
piece.
Remove
end
re-insert
the
tracking
test
cartridge
and
start
and
stop
the
tape
motion
several
times.
lf
the
tape
does
not
repeat
ea
c h
time,
che
c k
the
tape
guides
on
the
head
mounting
bracket.
The
guides
should
be
down
square
against
the
de
c k
surface
.
When
tracking
height
is
adjusted,
remove
the
track-
ing
test
cartridge
and
insert
a
15
kHz
azimuth
teat
tape.
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Set
the
tape
in
motion
and
obeerve
the
output
level
on
a
VU
meter
.
Adjust
the
reproduce
heed
azimu
th
adjustment
screw
for
maximum
output
.
Note
that
when
alignlng
a
newly
installed
head,
it
may
not
be
poeelble
to
get
correct
azimuth
readlnge
if
the
braes
collar
hae
been
tlghtened
too
much.
This
will
co
m-
press
the
washer
so
much
that
the
head
and
clamp
ing
block
cannot
move.
When
the
azimuth
adjustments
ere
co
mple
te,
re-
insert
the
tracking
cartr
idge
to
co
n
fir
m
the
tracklng
height
adjustment.
lf
t
he
adjustment
hae
changed,
continue
to
referenc
e
the
two
test
cartridges
against
each
ot
her
to
establish
correct
head
p
la
ce
ment.
When
the
reproduce
head
adjustments
are
complete,
proceed
to
adjust
the
tracking
height
of
the
record
head.
The
azimuth
of
the
record
head
is
determined
by
recording
a
12 KHz
tone
and
adjusting
the
record
head
for
maximum
output
at
the
reproduce
head.
Wllh
the
tracking
height
of
the
record
head
set,
insert
an
erased
cartridge
and
put
the
tape
in
motion
in
the
record
mo
de.
Feed
e 12
Hz
tone
to
the
record
input
and
ad-
just
the
line
level
control
for
a
program
level
indication
o f
-10
VU
on
the
front
pane
l
VU
meter.
head
to
azimuth
ridge
.
the
two
correct
Adjus
t
the
azimuth
adjustment
screw
for
the
record
maximum
output
using
an
external
VU
meter.
When
the
is
set,
re
c
heck
the
h
eight
with
the
tracking
ca
rt-
Tf
t h e
adjustment
has
changed
,
continue
to
reference
teat
cartridges
against
eac
h
other
to
establish
head
placement.
Improper
tra
c
ktng
height
wi
ll
reduce
separation
be-
tween
the
c
ue
and
program
tracks
c
ausing
an
in
c
rease
in
croee-talk
.
Impr
o
per
azimuth
will
cause
high
frequency
re-
sponse
to
decrease.
4 . 3
4.3
. 1
Deck
Adjustments
Refer
to
drawing
number
D-906-2109
Roller
Perpendtcu
l
arity
Manually
ra
is
e t
he
pressure
ro
lle
r
by
pushing
the
push
link
assembly
s c
rew.
Apply
a
slight
back
pressure
to
the
pressure
roller.
With
a
square,
Broadcast
Electronic
s'
gage
block
(stock
number
836-0004),
or
by
eye
,
determine
tf
the
pressure
roller
is
parallel
to
the
plane
of
the
tape
capstan.
lf
the
roller
la
n
ot
parallel
to
the
capstan,
re-
move
the
two
flat
head
screws
on
the
extreme
right
and
left
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ln
front
and
the
two
pan
head
screws
ln
the
rear
which
secure
the
tape
deck
to
the
chassis
.
DO
NOT
REMOVE
THE
TWO
CENTER SCREWS
lN
FRONT.
Raise
the
tape
deck
to
gain
access
to
the
prresure
roller
latch
on
the
u
nderside
of
the
deck.
Loosen
the
two
screws
which
mount
the
lat
c h
end
move
lt
ae
required
toward
the
front
or
back
of
the
deck
until
the
roller
le
parallel
to
the
capstan
.
Retlghten
the
latch
mounting
screws
when
finished.
4.3
. 2
Push
Link
Assembly
Screw
Check
the
adjustment
of
the
push
link
assembly
screw
by
slowly
ineerting
a
cartr
idge
ln
the
deck
and
noting
when
the
pressure
roller
latch
engages
.
The
latch
s h
ould
engage
just
as
the
cartridge
comes
in
contact
with
the
cart-
rldge
stop.
lf
the
cartridge
latches
before
it
comes
ln
cnntact
wi
th
the
atop,
adjust
the
push
link
screw
CLOCKWlSE.
lf
the
lat
ch
le
not
engaged
wlth
the
cartridge
against
the
stop,
adjust
the
push
llnk
screw
COUNTER-CLOCKWISE.
If
the
tape
creepe
when
the
right
hand
corner
cart
-
ridge
le
puehed,
turn
the
push
link
screw
l/4"
CLOCKWI
SE
.
lf
the
tepe
still
creeps,
check
for
excesslve
gap
between
the
solenoid
armature
assembly
and
the
solenoid
.
The
gap
should
be
no
more
thon
the
thickness
of
a
dime.
Optimum
adjustment
of
the
push
link
assembly
screw
will
differ
depending
o n
the
cartridge
manufacturer.
If
different
makes
of
cartridges
are
intermixed,
each
type
should
be
tested
and
an
acceptable
compromise
setting
established
.
4.J
. J
Press
ure
Adjustment
Using
a 5
-1/
2
to
10
-
mtnute
cartridge,
start
the
unit.
lneert
a
7/64
11
Allen
wrench
(stock
number
8)6-0003)
through
the
access
opening
in
the
front
panel
just
below
the
release
button
and
turn
COUNTER-CLOCKWlSE
until
the
tape
stops
moving
. Now
turn
the
adjustment
J
/4''
CLOCK
WISE
or
until
the
tape
rune
smoothly.
W
hen
a
flutter
meter
ts
available,
the
pressure
should
be
adjusted
for
minimum
pressure
and
flutter
output
when
reproducing
a
etandard
flutter
test
tape
.
4 . 4
Tape
Drive
System
Servicing
Refer
to
drawing
number
C-
906-2105
Remove
the
screws
which
secure
the
deck
plate
to
the
chassis
(eee
second
paragraph
4 . 3
.1
).
Raise
the
deck
plate
and
unplug
the
motor
from
the
power
supply
.
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NOTE
Release
the
motor
plug
locking
device
be•
fore
removing
the
plug
.
tn
the
record
equipped
unite,
also
unplug
the
re-
cord
head
leads
from
the
phono
Jacks
underneath
the
deck
plate.
W
ith
lhe
deck
plate
on
the
w
or
kbench,
remove
the
aub-aasembly
and
dismount
the
motor
from
its
mounting
plate.
Set
the
motor
and
mounting
hardware
aside.
To
remove
the
drive
pulley
from
the
motor
shaft
,
loosen
the
eel
screw
.
Graap
the
top
of
the
motor
in
the
left
hand
and
the
rotor
in
the
right
.
Firmly
but
gently
pull
the
rotor
and
ehart
o
ut
of
the
stator
.
Using
a
soft
t l
int
-
free
cloth,
clean
the
molor
shaft
with
a
household
cleanser
(Comet,
Bon
A
mi,
etc.)
and
warm
water.
Rinse
and
dry
the
shaft
. A
void
getting
water
on
the
rotor.
Re-oil
the
shaft
with
light-weight,
non-de-
tergent
oil
(stock
number
832-0010).
Wi
pe
off
excess
oll
with
a
soft,
lint-free
cloth
.
Re-insert
the
rotor
ln
the
stator
.
Carefully
fit--
don't
force
--
the
shaft
straight
through
the
bottom
bearing
.
Line
up
the
plastic
duet
cap
with
the
end
of
the
shaft
and
firmly
pueh
the
shaft
through
the
cap
.
lf
thle
cap
pope
l
oose,
simply
press
it
and
the
corresponding
metal
cap
back
into
place
.
Dy
hand,
check
the
rotor
for
free
rotation
.
Reinstall
the
pulley
on
the
motor
shaft
wi
th
the
large
dlameter
t o
wards
the
motor
.
Position
the
pulley
ap-
proximately
J/8"
away
from
the
motor
and
set
the
motor
aside
for
the
moment
.
NOTE
netts
must
run
level
when
the
de
ck
Ls
in
operatlng
position
.
Clean
and
Lubri
c
ate
th
e
hearln~
e11rface
ln
the
motor
shield
and
set
lt
aslde.
Remove
the
shaft
retaininR
plate.
W
lth
a
soft,
llnl-free
cloth,
wipe
off
the
thrust
bushing
and
flywhee
l
bearing
.
Ke-lubri
cate
the
thrust
bushing
wl
th
Lubriplate
or
Vaseline.
Wllh
ianpropyl
alcohol,
clean
any
dirt
from
the
belt
Kr
ooves
on
the
flywheel.
Remount
the
shaft
retalnlng
plott•
.
Flt
the
drlve
l>elts
on
the
flywhee
l
and
tlie
pulley
.
Remount
the
moto
r
wlth
Lhe
motor
leads
or
iented
as
shown
on
drAwln~
number
c-qo6
- 2 1
05
.
The
l
ong
screws
and
bushings
are
used
lo
mount
t he
motor.
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Vieually
check
the
alignment
of
the
drive
belts
and
pulley
with
the
flywheel
. Be
sure
the
belts
do
not
rub
on
the
motor
leads.
Remount
the
sub-assembly
on
the
deck
plate
.
Re-
connect
the
motor
plug
(and
head
leads
ln
record
units)
.
Remount
the
deck
plate
ln
the
chaeeis
■
W
hen
AC
power
le
applied
to
the
unlt,
the
drive
eyetem
should
operate
smoothly
and
quietly.
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SECTION 5 ELECTRONIC
ADJUSTMENTS
SERlES 1
000
General
Consideralions
Befot"e
adjusting
the
electronics,
clean
th
e
Lape
head(s)
with
AE-903
c
leaning
fluid
or
teopropyl
alcohol.
Be
sure
the
reprodu
ce
(and
record)
head(e)
are
properly
aligned
.
An
NAO
standardized
test
and
alignment
cartr
idge
le
required
for
proper
adjustment
of
the
unit
. Two
differ
-
ent
atyleR
are
available
from
llr
o
ad
caet
Electronlce:
stock
numbers
808-00
03
(NAB
type
3),
monophonic,
and
808-0004
(Fldellpac
350
STA),
slereoµhonlc
.
The
Fldellpac
le
parti
c -
ularly
recommended
(or
users
of
stereophonic
c a
rtr
idge
machines.
The
t
ones
recorded
on
these
test
and
allgnment
c
artridges
are
at
two
levels:
NAB
standard
operating
level
and
10
dtl
below
NAB
level.
The
or,erating
level
eegmenl
111
required
for
adjusting
output
level
and
in
measuring
noise
and
dlstortion.
Frequency
responee
measurements
and
equal-
lzatl
on
adjuetmenta
are
made
with
the
other
tones.
5.
2
Output
Level
Refet
to
Drawlng
Number
C-914-lJqo
While
reproducing
the
NAU
operating
level
tone
from
the
test
cartridge,
adjust
Rl4
o n
the
playback
hoard
for
the
desired
outµut
ae
meas11red
on
en
external
VU
meler
connected
to
the
output.
5. 3
Playhack
Equalizotlun
~efer
to
Drswllll'!
Number
C-914-13g4
Whil
e
repr
od
ucing
Lhe
'lO
llz
tone
from
the
test
cartridge,
adjust
R9
on
LhQ
playback
hoard
for
-10
VU
(10
dB
below
the
output
level
eeltlng)
ae
measured
011
an
external
VU
meter
connected
to
the
output.
Reprod11ce
the
15
kllz
test
tone
and
adju
st
IUO
011
the
playbac
k
board
for
-10
VU
on
the
externa
l
VU
meter
.
5. 4
Cue
Tone
Sensor
Level
kefer
to
Drawing
Number
C-
Q14
-t3Q
U
The
c
ue
tone
sensor
le
adjusted
while
reproducing
a
cue
tune
test
cartri
dge.
During
the
1
kHz
stop
tone,
adjust
R24
au
that
the
sensor
Just
t
riggers
and
Rt
ops
the
unit
.
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Each
time
the
teal
cartridge
le
etarled
,
woll
l
eecorlde
before
adjusting
the
atop
sensor
.
The
sensor
clrcuitry
le
disabled
for
thls
time
.
lf
a c
ue
lone
cartr
idge
la
nol
available,
Lonee
from
an
audio
slgnal
generatot
may
be
ueed
to
adjust
lhe
sensor.
To
do
this,
begin
by
dle
connecl
ln~
the
AC
power
and
then
the
blue
head
leads
from
the
playback
b
oar
d.
Con
-
nect
the
signal
generator
to
Pin
3
(ground)
and
Pin
4
(sig-
nal)
of
the
playback
board
. Do
not
l
oad
a
cartri
dge
ln
the
unit
but
manually
raise
the
pressure
ro
lle
r
and
o p
erate
the
controls.
Set
the
generator
fo
r 1
kHz
with
tJ
level
of
.45
mV
and
adjust
R24.
Wh
en
the
adjuetmente
are
complete,
dis
co
nnect
the
AC
power
and
reconnect
the
head
l
eads.
5 . S
Program
Record
~dJuetments
No
te
that
the
following
adjustments
ere
required
only
in
unite
equipped
wlth
the
record
module.
Remove
t
he
cover
to
gain
access
to
the
record
board.
tr
necessary,
adjustments
may
be
performed
with
the
module
out
side
the
unit
.
Always
be
sure
the
power
ie
off
before
removing
or
lnserting
modules.
5.
5.
1
Blas
Trap
Tuning
Refer
to
Drawing
Number
G
-914-1393
Connect
a
high
frequency,
AC
VTVM
between
the
Juncllon
o f R26 -
Cl5
to
ground.
Depress
the
KE
C
switch
to
place
the
unit
in
record
. Do
not
e•Jpply
any
elgnal
to
the
input.
It
le
not
necessary
to
load
a
cartridge
in
the
machine.
Wlth
a
non-metalli
c
screwdriver,
such
ae
a G.c.
Electronlc:e
alignment
tool,
tune
LI
for
a
minimum
reeding
o n
the
VTVM
.
ProAram
Oles
Level
The
bias
eupplled
to
the
record
head
ie
moel
im-
portant
ln
providing
optimum
frequency
r
esponse.
Ulae
rc-
qulremente
vary
between
brands
o f
tape
end
between
series
of
o ne
brand.
lf
m
ore
than
one
type
of
Lape
le
ln
use,
c
heck
the
performance
of
each
type
at
lte
optimum
hlee
level
agalnet
the
performance
at
the
opt
imum
bias
level
for
ot
her
tapes
.
Wh
ere
old
er
a
nd
newer
tapes
are
both
ln
use
(such
as
3Ml54
and
1
56),
hiae
Just
lees
than
the
optimum
for
the
newer
type
usually
te
an
acceptab
le
comprom
ise.
Once
the
blas
trap
le
tuned,
l
oad
a
bulk-erased
cartridge
in
the
untt.
Co
nnect
an
audi
o
slgnal
generator
to
the
rear
panel
record
input.
Set
the
generator
for
400
llz
at
A
level
of
0 . 5
V.
Adjust
the
record
level
control
for
-10
VU
on
the
front
panel
meter
.
Connect
an
external
VU
meter
to
the
OUTPUT .
Begin
recording
.
Observe
the
ex-
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ternal
meter
and
adjust
R70
on
the
record
module
for
the
peak
output.
5 . 6
VU
Heter
Calibration
While
recording
Lhe
400
Hz
tone,
adjust
the
record
level
control
until
the
external
meter
indicates
the
outp
u t
l
evel
determined
in
paragraph
5. 2 .
Now
adjust
R)O
on
the
recotd
module
so
thal
the
front
panel
VU
meler
indicates
()
vu.
,.7
Record
Equatlzatlo11
Now
eet
the
signal
generator
for
15
kHz.
Adjust
the
generator
output
for
10
dO
below
l
eve
l
in
the
meter
ca
l-
ibration
etep.
DO
NOT
ADJUST
THE
FRONT
PANEL
LEVEL
CONTROL.
Whil
e
recording
the
15 k
llz
tone,
adjust
R20
o n
the
record
module
for
-LO
VU
on
the
external
VU
meter
(10
dB
below
the
output
level
eetabliehed
ln
paragraph
5
.2
) .
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SECTION 6 C
UE
RE
CORD
A
DJUSTME
NT
S
SERIES
100
0
6
.1
Cue Bl
as
Level
Refer
lo
Drawi
ng
Number
C-
914
-
1393
Con
ne
ct
a
hlgh
freque
n
cy,
high
impedance
VTVM
t o
lerm
lnal
e t
and
2
of
lhe
record
module
(the
cue
record
head
l
eads).
Depress
the
REC
awltch
to
place
t
he
unit
in
recor
d.
Do n
ot
load
a
cartr
idg
e
in
t he
unit,
but
depress
the
ST
ART
awll
c
h.
A
fter
3
seconds,
adjust
R63 on
th
e
re
cord
module
for
5
VRMS
aa
measured
o n
the
VTVM
.
6 . 2 Cue
To
ne
Record
Leve
l s
Re
ferr
ing
to
draw
in
g
numbe
r C-
914
-13
90 ,
connect
a
VTVM
to
terminate
3
and
4
of
the
playback
b
oard
.
Load
a
bulk
-
erase
d c
artridge
ln
the
deck
and
depress
the
RE
C
switch.
DO
NOT
DEPR
ESS
THE
STA
RT
SWITCH .
Instead
,
manua
ll
y
put
t he t
ape
in
motion
by
preealng
t
he
play
solenoi
d
arma-
ture
against
t
he
play
solenoid
by
hand
.
While
thus
re-
co
rd
l
ng
a
co
ntinuous
atop
tone,
adjust
R60
on
the
re
co
rd
module
for
O
.h5
mV
on
the
V
TVM.
Release
the
so
len
oid
and
depress
t
he
STA
HT
aw
l
tch
.
Aft
er
J
eeconds
,
de
pr
ess
t h e QI s
wlt
c h Ln
re
co
rd
con
tlnuous
l y
the
I
',
0
II
z a II x I I
lo
r y c
ue
tone
• Ad I
us
t R59 n
11
t
he
RE
CO
ll
I>
module
for
0. 1
mV
on
th
e
VTVM.
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TROUBLESHOOTING
SUGGESTIONS
1.
Audio
Quality
Problans
(Playback.)
a.
'.lb det.enni.ne
if
the
cartridge
is
properly
reoorded,
t.est
any
suspect
cartridge
in
aoother
unit,
or
test
the
suspect
playback
unit
with
an
NAB
test
am
alignnent
cartridge.
b.
Oteck
oonnectima
t.o
the
output
jack
for
oontinui
ty,
proper
wiring,
loading,
am
grounding.
c.
Check
tape
head
alignmant.
d.
018Ck
playback
equaliMtioo.
If
the
equalizatim
ocntrols
cannot
properly
adjust
the
output
response,
replace
the
playback head.
e.
0leck
the
playbadt
8111:>lifiers
(see
below).
2.
lulio
~ty
Problert8
(Jeoot-d)
a.
Check
the
input
oonnectioo
for
continuity,
proper
wiring,
loading,
and grounding. Check
the
jmpers
on
the
record
board
for
proper
sensitivity
for
the
input
signal
(microplOl'le
or
line).
b.
Ol8Ck
record
head
alignnmt.
c.
Check
the
reoord
51l)lifiers
(see
below).
d.
Check
the
reoord
bias
adjusbnent.
e.
Check
the
reoord
equalizatim
If
bias
am
equalizatioo
a,ntrol
s
will
not
properly
adjust
the
reoord
performanoe,
replace
the
reoord head.
3.
Ole
Tone Problans
(Playback)
a.
1b
detemdne
if
the
cartridge
is
properly
recorded,
test
the
cartric);Je
in
amt:her
unit,
or
t.est
the
suspect
unit
with
an
NAB
test
and
allgment
cartridge.
b.
Clean
the
playbadt
head.
c.
Check
tape
head
height.
d.
Check
the
cue
tale
sensor
sensitivity.
e.
Clleck.
operatioo
of
the
manual
stop
(or
start)
a,ntrols.
If
raoote
ocntrols
are
ooonected, check
these
for
proper
operatim
~
connected
and
when
disooonected.
f.
ClJeck
the
cue
circuit
artl)lifiers
(see
below).
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4•
OJe
'lbne
Problam
(Iecord)
a.
Clean
the
record
head.
b.
<lleck
the
reoord
head
height.
c.
Oleck
the
tme
reoord
level.
d.
OleCk
operatia,
of
the
1
l<H7.
rea>rd
logic.
'lbe
1
J<Hz
generator
should
run
when
t11e
wrl.t
is
in
the
record
loode
wt
tape
not
in
nntion.
'lbe
generator
should
cmtinue
to
run
for
about
1-1/2
eeoa,ds
after
tape
nt>t.ioo
begins.
e.
Clleck
operatioo
of
the
150
Hz
generator
.
'nus
generator
should
run
whenever
the
wrl.t
is
in
record
and
the
front
panel
Ql switch
is
depressed.
Nl8n
the
switch
is
released,
the
generator should
tum
off.
f .
Cl1eCk
the
frequency
of
the
cue
generator's
output.
g.
ClleCk
the
cue
record
bias.
5.
Chec::kiD:J
Integrated
Circuit
Jwtt>lifiers
a.
Oleck
all
capacitors
for
shorting
or
reversed
polarity.
b.
Test
integrated
circuits
by
rreasuring
the
oc
voltage
present
on
the
IC
input
and
output
pins
(with a 20,000
chM/volt
vo-1).
'!his
should
be
ooe
half
the
OC
voltage
present
at
the
IC
OC
supply
voltage
~t
pin
(V+).
6.
Tape
Speed
Prd>lerM
a.
Clean
pressure
roller
am
capstan.
If
the
pressure
roller
is
worn
or
cupped,
replace
the
pressure
roller.
b.
OleCk
pressure
roller
perpend
i
cularity
and
p
ressure.
c.
Oleck
adjustnelt
of
the
push
link
asSElti>ly
.
d.
Service
the
tape
drive
syst:sn
.
e.
OleCk
the
q,eratim
of
the
p
lay
solenoid.
'lhls
shculd
energize~
the
srARr
switch
is
depressed
and
de-energize~
the
S'Ia>
switch
is
depressed.
(Wlen
energi7.ed,
the
solenoid
soould
draw
170
mA
at
23
volts
. )
f •
Check
tape
head
penetration.
Different
makes
of
cartridges
requ.ue
different
poeitims
of
the
head
bracket.
Follow
the
recumadAtioos
of
the
cartridge
manufacturer.
g.
01eck.
the
llDtar
and
llDtor
capacitor
for
CX11tinuity.
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OUTPUT
IALANCID UIINO
W.
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PHONE
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OR
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217
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SCHEMATIC
CONNECtlONS
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