SAFETY CHECK-OUT
After correcting the original service problem,
perform the following safety checks before
releasing the set to the customer :
Check the metal trim, Ometallized� knobs,
screws, and all other exposed metal parts for ACThe material contained in this manual consists of
information that is the property of Sony Corporation and
leakage. Check leakage as described below.is intended solely for use by the purchasers of the
LEAKAGE TESTequipment described in this manual.
Sony Corporation expressly prohibits the duplication of
The AC leakage from any exposed metal part toany portion of this manual or the use thereof for any
earth ground and from all exposed metal parts topurpose other than the operation or maintenance of the
equipment described in this manual without the express
any exposed metal part having a return to
chassis, must not exceed 3.5 mA. Leakagewritten permission of Sony Corporation.
current can be measured by any one of three
methods.
Le matŽriel contenu dans ce manuel consiste en
informations qui sont la propriŽtŽ de Sony Corporation et
1. A commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. Follow thesont destinŽes exclusivement ? lOusage des acquŽreurs
de lOŽquipement dŽcrit dans ce manuel.
manufacturersO instructions to use theseSony Corporation interdit formellement la copie de
instruments.
2. A battery-operated AC milliammeter. Thequelque partie que ce soit de ce manuel ou son emploi
pour tout autre but que des opŽrations ou entretiens de
Data Precision 245 digital multimeter is
suitable for this job.lOŽquipement ? moins dOune permission Žcrite de Sony
Corporation.
3. Measuring the voltage drop across a resistor
by means of a VOM or battery-operated AC
voltmeter. The Olimit� indication is 5.25 V, so
Das in dieser Anleitung enthaltene Material besteht aus
analog meters must have an accurate low-
voltage scale. The Simpson 250 and SanwaInformationen, die Eigentum der Sony Corporation sind,
SH-63Trd are examples of a passive VOMund ausschlie§lich zum Gebrauch durch den KŠufer der
in dieser Anleitung beschriebenen Ausrźstung bestimmt
that is suitable. Nearly all battery operated
digital multimeters that have a 20 V AC rangesind.
Die Sony Corporation untersagt ausdrźcklich die
are suitable. (See Fig. A)VervielfÅ ltigung jeglicher Teile dieser Anleitung oder den
Gebrauch derselben fźr irgendeinen anderen Zweck als
die Bedienung oder Wartung der in dieser AnleitungTo Exposed Metal
beschriebenen Ausrźstung ohne ausdrźcklicheParts on Set
schriftliche Erlaubnis der Sony Corporation.
AC
0.15 uF1.5 kZvoltmeter
(5.25V)
Earth Ground
Fig A. Using an AC voltmeter to check AC leakage. |
ACEC
