Adju'stments Ielectrical); Reference Voltage And Waveform At Each Ic Pin - Panasonic SL-1200MK2 Service Manual

SL-1200MK2 SL-1200MK2
• ADJUSTMENT (Electrical)
Notes: • Make the following adjustments after replacing parts such as I C's, transistors, diodes, etc.
• Condition of the set.
1. Power switch ............. ON
2. Pitch control ............. Center position
3. Speed selector switch ....... 33-1/3 r.l>.m,_.
• Instruments to
be
used
1. Tester
2. Frequency counter
Adjustment Connection Poi nts Adjustment Point Adjustment Method
I
Adjustment
"
Frequency counter ,. Pitch control switch to center position.
A
of pitch
e
-TP27 VR301 2. Adjust VR301 for 262.08 kHz.±.0.05 kHz of
contro I ±.O%
(PITCH)
8 -
GROUND frequency.
Adjustment I Tester
..
I Adjust VR302 for 2.7 kfl±.O.l of resistance
B of pitch TP31 and VR302
control gain TP32
I value
Braking
Adjust VR201 for complete stop within 120
0
-
270
0
C adjustment
-
,
VR201 after stop signal initiated. (Turntable becomes free a
(BRAKE) few seconds after stop)
STOPSIGNAL
.- _.
--~.-
-0:' .. -
-_._--
120"
- - - - - - - - -
• REFERENCE VOLTAGE AND WAVEFORM AT EACH IC
PIN
1&1111111111
Start
Stop
Stan
Stop Start Stop
<D
2V
2V
~
®
,
2V
2V
@
~
lSV
1
@
Same as at right
@
OV OV
@
1
SV SV
~ ~L
@
SV
SV
@
".
@)
20V 20V
®
SV 6.6V
!
I
@ 20V 20V
(Ï) OV OV
@
lSV lSV
..
...@
20V 20V
@
5V
SV
~!v
....
@ O.2V O.2V
®
DV OV
@
~
@ ·20V
~
20V
....
...............
- - - r
1
@ 1.7V 1.7V
@
15V
ISV
- - ,
@
OV OV
....
L
@
lSV ISV
©
".
f I
- -
L.
I
I
IC201 IAN6680)
Start
<D
2.SV
®
Same as at right
@
Same-as"at tight
@ Same as at right
@ Same as at right
@
3.4V
®
OV
IC301 IAN6682)
Start
<D
Same as at right
® Same as at right
@ Same as at right
IC302 'SV ITC4011 SP)
Start
<D Sam. as at right
® SV
@ Same as at right
@
SV
_ _ .lIDlltI_
Start
E
OV
c
Same as at ngh!
B
Same as at light
[TI]
@.I
Stop
2.5V
-!.ja
i-- .l..
JlJlJl'.
T
...,........ J.
~
~
,
. .
..
--!o-.~
f\ f\ ,'.
,~
.;111
3.4V
OV
Stop
..., ... te- ....I.
~
..
~.
.
.=
,
...
ÎJ\Nv';..
I
Stop
-1""1-
.J..
fl.1lJ1.;
SV
J-ïJ=d
SV
Stop
OV
înrt
U U
t.;
1,'-1:;----1.
.JU"--f-
Start Stop Start Stop
®
OV OV
@ SV
2.SV
® 9.8V 9.8V @ SV SV
@ lOV lOV @ OV OV
@)
7.SV
OV
©
Same as at right
~
@
OV SV
@ l.SV OV
@
OV OV
@ 3V
3V
@
)
[
I
[
I
)
..
O.2V @
~
3V
f
I
~
~
@ 2.8V 2.8V
@
@
~
8V
Stan Stop Start Stop
~
.~
@
Sam. as at right
® Same as at right
._' "
I
@
DV OV ® 9V 9V
@
3.9V 3.9V
® Sam. a. at ria!!t
1-CJlt
--
Stan Stop Start Stop
I
JiJt;
®
SV SV
@ Same as at right @ SV SV
© SV SV
@ SV
SV @ D.6V O.6V
CD OV OV @ O.6V O.6V
I
1-lfLn;
@ SV SV
,
® Same as at right
..