Sony TC-RX77 - Page 2

TC-RX77/RX77ES
TABLE OF CONTENTS
Section Title Page
Specification S/S BS Sea a eee er eser ee rete: eve eens ewe Nec ene <a tenerer ole al Gee eee 1
; Model Identification wey el ole tenes te eS" SU SNS. SSUES Slee ws ere ere reset eieven ese. 2
Safety Check-Out BOBO bib SNS Ow co Le: WLS Ge Ver ONS eee cede. 8 Je~eueitior enete: ® 2
1 GENERAL 6 80s eiide ated ceiieie oe ecloew ind B9G 56 Res 3
2: DISASSEMBLY str xe kite o0es Os eee Eas eet kos 4
3 ADJUSTMENTS <6 6 teria tees his eet ely g sei alee be 7
3-1. Mechanical Adjustment ++++++++sseeresereree t
3-2. Electrical Adjustment 6 Wns ele eet eats, oC ew onal eke ere wisete 7
. DIAGRAMS
4-1. Semiconductor Lead Layout:::t+rrrrste eee 11
4-2, Circuit Boards Location -+++++rssee reste cers 11
4-3, Printed Wiring Boards -++++++++seeee reece 12
4-4, Schematic Diagram aie aiid Gute Sie vale Loiieyecene iene tobe peceneceie 17
EXPLODED VIEWS <tesesc0esxetaceatver sieht cass 16
5-1. Front Panel Section -s+ssserssee ee eeeeeeeees 23
. 5-2, Chassis Section EO RO a eR RC RT REN Re Ae 24
5-3. Mechanism Section (TCM~200R6) «++++++++> 25
5-4. Mechanism. Section (TCM-200R6) ---+-:++++- 26
_ ELECTRICAL PARTS LIST <:--:--ceececcreceeenee 27
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A 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 PUB-
LISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE MARQUE /\
SUR LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL OU
DANS LES SUPPLEMENTS PUBLIES PAR SONY.
SAFETY CHECK-OUT
After correcting the original service problem,
perform the following 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 0.5mA (500 microampers). Leakage
current can be measured by any one of three
methods.
1. A commercial leakage tester, such as the
Simpson 229 or RCA WT-S40A. Follow the
manufacturers’ instructions to use these instru-
ments.
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 volt-
meter. 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 2V AC range are
suitable. (See Fig. A)
To E. xposed Metal
Parts on Set
LAs
0.15 uF voltmeter
A 628)
= Earth Ground
Using an AC voltmeter to check AC leakage.