Roland RE-501 - Bias Leakage Trap; Motor Speed; Head Alignment Procedures; Tangency

RE-501/SRE-555
JULY 11,1980
ADJUSTMENT
AND
CHECKING
1.
MECHANICAL
ADJUSTMENT
1-4. FRAMES
13,14
&
15
POSITIONS
While engaging
pinch roller with motor
shaft,
position
and
fix frames as
indicated below.
2.
ELECTRICAL
ADJUSTMENT
2-1.
BIAS LEAKAGE
TRAP
2-3. LED
BAR
DISPALY
-
ET-61
-
2-6. HEAD
ALIGNMENT
The
following
adjustments
must
be
done only
after
completion
of
MECHANICAL
ADJUSTMENTS.
1-1.
TAPE
CHASSIS
POSITION
Position
tape
chassis 1mm
off
motor
shaft and
secure it by
tightening
two
screws at
rear.
1-2.
TAPE
CHASSIS
HEIGHT
Position
chassis
10.5±0.5i™i
above
main
chassis.
Position solenoid
for
1.1-1.
25kg
pinch roller pressure.
1-6. HEADS
ALIGNMENT
1-3.
LEAF
SPRING
PRESSURE
Position
frame no. 16
to have
Position
each
head gap
perpendicular
to
and center
on
the passing
tape
by
turning
alignment screws.
-
PS-66
-
control
panel
INPUT
VaUME
REPEAT
SINGLE
9WTCH
POTENTIOMETER
NO.
0€Ck\
PONT
^
TRAP
COIL
TP3
MIN
SINGLE
Set VRIOO
at
its
midpoint.
Connect
VTVM
or scope to
TP-3*
a)
Turn LI core,
with
appropriate
tool,
for minimum
reading
(
should
not
be
more than
IV
rms )
.
Continuous turning will
dip
the
meter
reading
twice
—
at
funda-
mental and at
2nd
harmonic.
Tune LI
to
fundamental.
2-2.
MOTOR
SPEED
-
PS-66
-
CONTRa
RANEL
REPEAT
RATEPOTENTIOMETER
NO-
OECKX
PONT
N
VRIOI
0107
QUO
Q111
QUA
00LLEC10R
MIN
Scope
(DC
couple,
nagative slope,
normal) : one
of the
check points.
a)
Set VRIOI for
the
T shown in
the
figure
below.
Time base should be
triggered
at
the lowest
negative peaks.
T should not be
longer than
23ms
with
REPEAT RATE
set at
FCW posi-
tion when the
machine
is
operating
on the
rated
line voltage.
CONTROL
PANEL
INPUT
VaUME
INPUT
LEVEL
SWITCH
POTENTIOMETER NO.
oeiK
PONT
>
VR12
LED
BAR
DISPLAY
MAX
OdB
CONTROL
PANa
POTENTWMETER
NO.
OUT PUT
A
INPUT
V0L1>C
INPUT
LE\€L
9MT04
OIRECT
SCNAL
9MTCH
swncH
Sons
EFreci
CHORUS
THOOE
ECHO
MAX
—
OFF
OFF
ON OFF
OFF
ON
Input
signal: IkHz,
sine wave,+2dBm,
into INPUT-
2
jack.
a) Turn VR12
FCW;
then reverse
it
,
slowly
until
BAR
displays
+2dB.
b)
Make
sure
that
LEDs
read -12dB
under
the
following
settings:
INPUT
INPUT LEVEL
SIGNAL
SWITCH
INPUT-1
-8dBm
INPUT-
2
-12dBm
OdB
-37dBm
-25dB
-62dBm
-50dBm
ECHOSorS
VDUJ>C
ECHDSmS
^
iNTENsrrvpf
REVERB
VOLUME
T»
BASS
e
TREaE
OUTPUT
REPEAT
SNGLE
aWTCH
MAX
—
CENTER
MIN CENTER
CENTER
SINGLE
2-6-1.
Fine
Alignment
Take
visual
head
examination
for
misalign-
ment
referring
to
the
figures
below.
Readjust
as
necessary.
(a)
TMGENCY
—
—
Q]
2-4.
COMMON MODE
REJECTION
control
panel
input
vaUME
INPUT
LEVEL
SWITCH
DIRECT
SKGNAL
SWITCH
potentiometer
no
chedk
pairi
VR 1
OUT
PUT
MIN
ON
EFFEa
MODE SWITCH
CHORUS! ECHO
|
ScrS
(
.
1
„
ECHOSoaS
VOLUNE
REVERB
VOLUME
TONE
BASS
1
TREBLE
OUTPUT
LEVEL
avITCH
OFF
j
OFF
OFF
MIN
MIN
MIN
MIN
OdBml
The faces
of
the
head cores
must
be
simultaneously
tangent
to
the
same
degree
with the
tape.
(b)
HEIGHT
ERASE
HEAD
RECORD
HEAD
PLATFORM-
nn
PH-1
MODE
1
PH-2
MODE 2
PH-3
MODE
3
'TO'
m
it'-lriE
‘Ki.fr
Trr
.m.
Input
signal:
IkHz, sine wave, +4dBm
into
INPUT
-1
jack with
its pins
2
and
3
joined.
Oscilloscope:
OUTPUT-A.
a)
Adjust VRl
for
minimum IkHz
signal
output
.
Every
gap-width
dimension
is
centered
on
the
same
track location.
(c)
AZIMUTH
2-5.
COMPRESSOR
LEVEL
CONTROL
PANEL
INPUT
VaUME
INPUT
LEVEL
SWITCH
REPEAT
SINGLE
SWITCH
POTENTIOMETER NO.
CHKk\
pontK
VR8
TP 1
TP
2
MAX
OdB
single
Width
dimension of
the
head gap
is a
precise
90-degree
angle
to the
tape edge.
(d)
TILT
Input
signal: IkHz, sine wave , INPUT-2
.
a)
Set
audio generator
for
-40+0. IdBm
reading
on
millivoltmeter
at
TP-1.
b) Adjust
VR8
for -34.5dBm
reading
at
TP-2.
Distributed
meter
lead capacitance should
be
less than lOOpF.
TAPE
The tape
must
contact
with
head
surface
precisely
in
parallel.
10