JVC QL-A2 Service Manual

6. Block Diagrams
6-(1) Servomotor Control System
Platter
Light emitting diode 4
Waveform
shaper
Frequency
generator
50 Hz (at 33-1/3 rpm)
LED 67.5 Hz (at 45 rpm)
indicator
circuit
Power
switch
sn
.
Power
Motor
drive
:
z
circuit
aoe
9.504
MH
supply
B35
ae
hee
circuit
+e
_—
|
ous
Speed select
signal
AC
Fig. 7
6-(2)
IC802
Integrated
Circuits
and
Waveforms
Yss
Po
P)
P2
P3
Ps
P5
Pé6
P7
20/27
DO
oppo
ee
ar
”
Lt
et
otf
SM64I5A-4
(i
Se
Ue
65
10
STAGE
PROGRAM
COUNTER
—_———
:
*
}
|
ogy]
ea
20V
ST
ots
20mS
Input
Fig. 10 Waveforms (Pin 1 through Pin 11)
F/V section
Waveform at pin 4.
5v
FYs FVc FY PDs PDs PDc
Fig. 8 Block Diagram
i
\
i
Waveform at pin 5, ¥
’
TOP VIEW
-— — jes
vool lo vss ;
ea
=
!
QIN
PO
!
|
Waveform
at
pin
7.
H
SOUT mre | teal
FG
IN[
|
r
|p2
a
Approx.
2.0
V
at
33-1/3.
—
FVS
2
2
P3
-
5
7
rve( g 3 A P/D section
=
oO
—
7
1
FV
a
i
P5
Waveform
at
pin
8,
|
;
=)
ho
2
PDS
&
oO
[Jes
:
=a c= |
PDB P?
—4
t=
+
PDC
ST
Waveform
at
pin
11
|
t
=]
Kk
:
|
V2-V6s2
PPh
20/27
Approx.
1.37
V
at
33-1/3.
Be sure to obtain :
the waveform
DATECODE
at
pin
13
through
|
Fig.
9
Pins
Location
Ree
Ororhesiele
Deviation at lock adjustment
damaged.
(this should be within + 7 msec.)
Fig. 11 Waveforms (F/V and P/D)
QL-A2
No. 2444 -5-

JVC QL-A2 Specifications

General

Brand	JVC
Model	QL-A2
Category	Turntable
Language	English