Table of Contents
Advertisement
' alyéh
j S- cack BR
Sad eae eae lsd
adecagedc@e
Ua] ae
ed
ads
en
Ge
freee pipet cath rahe [SHEE cet Ghote m o
tasted ce
a
ag
We
atthe
goatee
2 ,
O g
'
6 oN Tag i e d g
WE
Seas
aie cg
Pe ere
ac
e e
eave
alee
Hef
i g d e
ee
P e e
pibe
e s ,
Be caeutingin cop dg dates
LS ding Hh papel ped ia chai:
SP Hgcdy
betel eapiedh
wee Gia dep
cde
fe RUPE bey)
PMc
Bg asin
PHT Aes Ru: ike send
ULES
ETE
BUSS AD REE
PB Bae TH
ELECTRONIC
ADJUSTMENTS
Follow alignment sequence for electronic adjustments
H
below.
A. Supply Voltage Verification
B. Phase Lock Alignment
C. Wow and Flutter Alignment
SUPPLY VOLTAGE
Connect a digital voltmeter to Power Supply Board
Pins and verify DC voltages.
A. Pin 17-(Ground)
C. Pin 15(~—12VDC)
B. Pin 20-(+12VDC)
OD. Pin 14-(+5VDC)
PHASE LOCK ALIGNMENT
A.
Adjust crystal oscillator VC1 trimmer by mon-
itoring (Pin 13) IC-3 for:
33RPM - 22500 + 2 Micro-Secs (44.44Hz)
45RPM - 16666 + 2 Micro-Secs (60.00Hz)
B. Connect a dual trace scope to (Pin 13) IC-3 and
(T.P.) collector X1.
Superimpose wave forms
and adjust VR4
and VR5.
Refer to Figures
below.
33RPM - 14.0 + 0.4 M Secs. with VR4
45RPM - 11.0 + 0.4 M Secs. with VR5
14.7 0.4 ms
)
1C3-13
T.P. (33 RPM)
T.P. (45 RPM)
|
|
11.2.0.4 ms
WOW AND FLUTTER
ALIGNMENT
It is recommended
to align wow and flutter circuit by
both
methods
(meter alignment),
(scope
alignment)
below.
WOW AND FLUTTER METER ALIGNMENT
A.
Connect a wow/flutter meter to the amplifier
output and adjust VR1-Motor Control Circuit
Board for minimum reading.
B.
Adiust
VR2
and
VR3-Motor
Control
Circuit
Board alternately to minimize flutter.
WOW AND FLUTTER SCOPE ALIGNMENT
A. Connect
a dual
trace scope
(Pins 3, 8 Motor
Control
Circuit Board) and superimpose wave
forms.
Reference
Figures below.
B. Adjust VR1
for amplitude and VR3 and VR4
for 90° phase difference.
NOTE:
The Turntable must
be level for all wow
and Flutter adjustments.
{INCORRECT
DRIVE
WAVEFORM
difference
CORRECT
DRIVE
WAVEFORM
90° PHASE
CIRCUIT WAVEFORMS
b—a|
33RPM-22.5mSec
45RPM-16.66mSec
COLLECTOR
}-.—____——-om
33RAPM-22.5mSec
45APM-16.66mSec
33RPM-22.5mSec
45RPM- 16.66rmS ec
PAT Av Aes fe.
IC3-8
—
33RPM-22.5mSec
45RPM-16.66mSec
]
|
|
| 5.0¥
1C3-13
33RPM-22.5mSec
45 RPM-16.66mSec
33RPM-4.0V
45RPM-4.3V
X11, 13
EMITTER
33APM-1I3mSec
45RAPM-83mSec
PINS 4,7
ad
33RPM-113mSec
45RPM-83mSec
Advertisement
Table of Contents
