Kenwood R-2000 - NB, IF Trap, and Microprocessor Checks

ADJUSTMENT
Measurement
Item
Condition
Test
equipment
Unit
9.
NB
1) f:
14,525.0
kHz
Noise
Rear
MODE:
AM
generator
panel
\IVIDE/NARROW: \IVIDE
NB:
ON
Noise generator output level:
S
meter
indicator 5
±
1
2)
10.
1st
IF
1)
f:
29,525.0
kHz
SSG
Rear
trap
MODE: USB
AFVM
panel
SSG
output:
45.875
MHz
Oscillo-
..
90dBµ
scope
AF
dummy
load
11.
"Beeper"
1)
AF
GAIN: Center
AFVM
Rear
TONE: Center Oscillo-
panel
SQUELCH: Closed
(No noise) scope
*Connect
R259 and R273.
AF
dummy
(Disconnect after adjustment.)
load
<Microprocessor
operational
check>
Item
1.
Encoder
(Dial)
2. BAND
3.
F.
LOCK
Condition
1)
TUNING SPEED: SLOW
Turn
the
tuning
control
clockwise and
counterclockwise.
Turn
the
main tuning 1
turn.
2)
TUNING SPEED: MID
Operation
Check
Display changes
in
100
Hz steps.
Display changes
10
kHz.
Turn
the
tuning
control Display changes in
500
Hz
clockwise and step.
counterclockwise.
Turn
the
main tuning 1
turn.
3)
TUNING SPEED: FAST
Changes
100
kHz.
Turn
the
tuning
control
Changes
in
5 kHz step.
clockwise and
counterclockwise.
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Turn
the
main
tuning
Changes
1
MHz.
1
turn.
1)
TUNING
SPEED:
FAST
Keep
the
UP
switch
de-
pressed
until
tuning
stops. Then
turn
the
tu-
ning control clockwise.
Keep
the
DOWN
switch
depressed
until
tuning
stops. Turn
the
tuning
control counterclock-
wise.
1)
F.
LOCK:
ON
Turn the
tuning
control
and BAND knob.
The
MHz
digit
scans up in
1
MHz
steps and stop
when
the
display indicates
29,995.0
kHz.
W2
type
stops tuning at
25,995.0.
The
MHz
digit
scans
down
to
0.100.0
at
a
1
MHz step.
W2
type
stops tuning at
0.1
50.0
and X type stops
at
2.000.0
The display should
not
change.
Ter-
min
al
Unit
ANT
RX
PLL
ANT
RX
EXT
SP
RX
Item
4.
DIMMER
6.
CLOCK
and
TIMMER
R~:2000
Adjustment
Specifications
Part
Method
VR4
MIN
$1
or
less
(Typical)
..
T10, T11
Repeat steps 1) and 2)
so
the
NB
functions
on noise
which
is
below
the
minimum
S meter level.
T3
MIN
70dB
or
more
VR10
0.3V
Tone should remain
audible even when
the
AF
GAIN
is redu-
ced
to
MIN.
Condition
Operation Check
DIMMER:
ON
The
S meter and display
ii·
rumination should
be
redu·
ced.
1)
POWER:
OFF
The clock should function.
FUNCTION: CLOCK
1
The
illumination
should
be
dim.
2)
TIMER:
ON
*
TIMER
ERROR
(red)
indi-
cator should light.
*
CLOCK
display
flashes;
3) TIMER:
ON
" CLOCK
display should be
Simultaneously
press
0:00.
both
the
HOUR
and
Ml-
*
TIMER
ERROR
(red) indi-
NUTE TIME
SET
swit-
cator should
go
off.
ch
es.
4) FUNCTION: CLOCK 2
Keep
the
HOUR
and
Ml-
The
display
should conti-
NUTE
switches
depres~
nuously
advance.
sed.
.
.................
,
........................
.........................................
Set
the
hours digit. The display should'indicate
the
time
difference from
CLOCK
1.
5)
FUNCTION:
ON
Set
the
TIMER
display
to0.02.
6)
FUNCTION:
OFF
Set
the
TIMER
display
to0.03.
7)
FUNCTION: CLOCK
1
Set
the
TIMER
display
Power should
turn on and
to0.02
.
the
unit
should function.
..........................................
·········································
Set
the
TIMER display
Power
should
shut off.
to0.03.
27