Sony PS-LX300USB - USB Stereo Turntable System, Service Manual

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PS-LX300USB
2
SECTION 1
SERVICING NOTES
NOTE FOR CHANGING THE CARTRIDGE
Note:
When changing the cartridge, be sure to
fi
x by a bond.
SONY BOND SC608LV (Part No. 7-600-000-48)
or equivalent bond.
cartridge
tonearm assy
- bottom view -
REPLACING THE STYLUS SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
of a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range are suitable. (See
Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k
Ω
0.15
μ
F
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
The life expectancy of the stylus tip is about
500 hours. To preserve good sound quality and
avoid damage to your records, we recommend
replacing the stylus within this time limit.
For a replacement stylus, consult your nearest
Sony dealer.
To remove the stylus
1
Turn off and unplug the AC power cords of
the turntable and amplifier.
2
Protect the stylus with the stylus cover.
Stylus cover
3
Grasp the stylus holder and pull it
downward away from the body of the
cartridge/headshell as shown.
Stylus holder
Cartridge/headshell
To install the stylus
Do this procedure with the stylus protected by
the stylus cover.
1
Grasp both sides of the stylus holder, then
insert the stylus grip into the cartridge/
headshell receptacle.
Stylus holder
Stylus grip
Stylus cover
2
Push up the stylus holder until it clicks so
that it locks completely.
Note
Do not push the stylus cover forcefully. Otherwise,
the exposed stylus from the cover may cause injury, or
damage the stylus.
Do not leave any
space.
Ver. 1.1
SAFETY-RELATED COMPONET WARNING!
COMPONENTS IDENTIFIED BY MARK
0
OR DOTTED LINE
WITH MARK
0
ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE
0
SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONC-
TIONNEMENT. NE REMPLACER CES COM- POSANTS QUE
PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DON-
NÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.