Kenwood R-2000 - PLL and Encoder Adjustments

R-2000
ADJUSTMENT
Adjusting PLL Section
Measurement Adjustment
Item
Condition
Test Ter-
Specifications
equipment
Unit
minal
Unit Part Method
1.
Reference
1)
POWER:
ON
Frequency
PLL
TP4
PLL
TC1
36,000,000
Hz
±20Hz
oscillator
counter
frequency
I·
~
2.
vco
1)
MODE:
AM
DCVM
PLL
TP7
PLL
T3
7.5V
±0.05V
f:
17,000.0
kHz
2) f: 16,999.9
kHz
Check
2.3Vormore
3."VCO-H
1)
MODE:
AM
DCVM
PLL
TP13
PLL
TS
7.8V
±0.05V
f:
29,999.9
kHz
····················································
········································
(W2type)
f: 25,999.9
kHz
5.6V
2) f:
17
,000.0
kHz
Check
2.0Vormore
4. VCO-M
1)
MODE:
AM
DCVM
PLL
TP13
PLL
T7 7.8V
±0.0SV
f: 16,999.9
kHz
2) f:
8,000.0
kHz
Check
2.0Vormore
5.
VCO-L
1)
MODE:
AM
DCVM
PLL
TP13
PLL
T6
7.8V
±0.05V
f: 7,999.9
kHz
2)
f:
100.0
kHz
Check
2.0Vormore
············································"········
...............
...............
··············
..............
.
.............
(W2 type)
f:
150.0kHz
.....................................................
.................
..............
................
..............
..............
........................................
................................
(X type)
f:
2,000.0
kHz
Check
3.0Vormore
6.
Encoder
1)
Remove the
MAIN knob and
Oscillo-
PLL
Connec-
motor-drive the encoder at scope
tor
Point
C
may
be
lo-
approx.
300
rpm.
@-EN1
A~
I
I
I
rm
~B
cated anywhere.
When motor drive
is not available,
<
manually
turn the
MAIN
control to
0
check the duty
ratio.
2)
EN
1 duty ratio adjustment: Encoder
VR1
After adjusting
with
Turn a motor clockwise
and
the
MAIN
control
counterclockwise.
,A~
I
I
I
Ml
I
~B
turned CW,
check
that intervals D and
E
are
also identical
when the
MAIN
control is turned
0
l-o--4--E--I
ccw.
3)
EN2
duty ratio adjustment: Connec-
Turn a motor in the both
tor
VR2
Adjust until intervals D
direction.
@-EN2
and E are equal
to
each
other
with
point
C
placed
at the center.
4)
EN1,
EN2
phase difference
Connec-
A~
111
rm1
1111
EN1
(EN2): Within
adjustment:
Same
as
above.
tor
EN1
90°
±
20%
(The dif-
@-EN1
(EN2)
ference between
and
EN2
CW
and
CCW
rota-
tion
must also
be
~\l\Vilh91
within this specifi-
EN2
cation.)
The phases
of
EN1
(EN1)
and
EN2
may
be
re-
placed
with
each
0
D
E
other as indicated in
~
the brackets.
7.
PG
SCAN
1)
f:
15,000.0
kHz
SPEED
MEMORY
CH:
9
Write in with M.
IN
switch.
2)
f:
15,010.0
kHz
MEMORY
CH:
0
Write in
with
M.
IN
switch.
3)
PG
SCAN:
ON
PLL
VR1
Turn clockwise/counter-
clockwise
to
check scan
speed change.
Set
to
mechanical center
25