Marantz SR-53 - Service Program

8. SERVICE PROGRAM
1. T.R POINT ME (tracking point memory) mode.
From
power
OFF
(backup
mode),
when
the
power
switch
is
pressed
ON
while
pressing
the
up
and
MEMO
key
simultaneously,
the
T.R
POINT
ME
mode
is
called.
Frequencies
to
be
memorized
are
as
follows.
P4
106.0 }87.5
MHz |MHz
2. Microprocessor and FL operation check program mode
2-1 FL segment check
@ This program is to check each FL segment for its lighting.
(1) When the test mode is entered, microprocessor’s
‘MUTE OUT becomes “HIGH” to apply muting to the
unit itself. No change occurs in any other setting.
(2) At first, every segment is aliget. for 3 seconds.
2-2 Service mode (input selector check)
® This program is to check the input selector, etc. of the
unit itself for functioning.
(1) Microprocessor’s MUTE OUT is made ‘‘LOW”.
(2) In a procedure shown in the following, each object is
subject to execution of check for 3 seconds, and
operation shifts to the next one. Then, operation
starts at step 1.
(3) At the time of object change, muting is applied at the
aforesaid timing.
(4) When the final step is executed, operation returns to
step 1 to repeat.
(5) When the @) key is pressed, operation shifts to the
next step. However, in this case, any continuous
pressure of this key is not accepted. Operation is
stopped by the key and is resumed by the
(@) key. Either is always accepted.
Step Function
1 FM
FM
FM
mode:
Mono,
last
frequency
(initial)
Notes
FM mode: Auto, last frequency (initial)
ala} aoa{an]/ alow)
A >
a)
m
PCS 71 240
9. TUNER ALIGNMENT PROCEDURES
1. When you adjust a set, use a signal generator with a
counter
with
which
you
can
correctly
read
frequencies,
or
connect
a
counter
to
a
signal
generator
with
a
counter
terminal for both AM and FM.
2.
As
a
rule,
use
a
band-pass
filter
(B.P.F
200-15
kHz)
designated
by
IHF
in
adjustment
and
measurement
of
FM.
Be
sure
to
use
a
filter
especially
in
adjustment
of
STEREO
DISTORTION
and
SEPARATION.
(Attenuation
at
19
kHz
is
to
be
30
dB
at
least.)
3.
The
controller
(QU02)
used
in
this
set
has
a
function
to
preset
and
memorize
the
frequencies
of
guard
and
track-
ing
point
to
be
used
in
adjustment
and
measurement.
Caution:
Alignment of FM needs to set the [F BAND SWITCH to
‘WIDE’ position if any other instruction does not re-
quire.
4. Adjustment of FM MPX VCO
The part to be adjusted: R314
1)
Set
the
frequency
and
output
of
the
signal
generator
at
98
MHz
and
500
uV
(54
dB)/75
ohms
respectively
and
synchronize
the
set
to
them.
2)
After
confirming
that
the
“TUNED”
indicator
in
FL
display
is
not
turned
off
when
you
set
FM
MODE
SWITCH
in
AUTO
STEREO
position
(AUTO
is
alight),
turn
off
the
modulation
of
the
signal
generator.
3)
After
connecting
a
frequency
counter
to
the
test
point,
UP15,
adjust
R314
so
that
the
frequency
counter
shows
228
(+0.05)
kHz.
P304
VCO ADJ.
R314
20