Sony BKM-301HD User manual

...............
SERVICE MANUAL
MODEL DEST
BKM-301HD US/CND
R
HD SDI INPUT ADAPTOR
POWER BLOCK B BLOCK GC BOARD
............

!WARNING
This manual is intended for qualified service personnel only.
To reduce the risk of electric shock, fire or injuly, do not perform any servicing other than that
contained in the operating instructions unless you are qualified to do so. Refer all servicing to
qualified service personnel.
WARNING!!
AN ISOLATION TRANSFORMER SHOULD BE USED DURING
ANYSERVICETOAVOIDPOSSIBLESHOCKHAZARD,BECAUSE
OF LIVE CHASSIS.
THE CHASSIS OF THIS RECEIVER IS DIRECTLY CONNECTED
TO THE AC POWER LINE.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTSIDENTIFIEDBYSHADINGANDMARK!ONTHE
SCHEMATICDIAGRAMS,EXPLODEDVIEWSANDINTHEPARTS
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!!
AFIND’EVITERTOUTRISQUED’ELECTROCUTIONPROVENANT
D’UN CHÁSSIS SOUS TENSION, UN TRANSFORMATEUR
D’ISOLEMENTDOITETREUTILISÉLORSDETOUTDÉPANNAGE.
LE CHÁSSIS DE CE RÉCEPTEUR EST DIRECTEMENT
RACCORDÉ Á L’ALIMENTATION SECTEUR.
ATTENTION AUX COMPOSANTS RELATIFS ÁLA
SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE TRAME ET PAR UNE
MAPQUE ! SUR LES SCHÉMAS DE PRINCIPE, LES VUES
EXPLOSÉES ET LES LISTES DE PIECES CONT D’UNE
IMPORTANCE CRITIQUE POUR LA SÉCURITÉ DU
FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES
COMPOSANTSSONYDONTLENUMÉRODEPIÉCEESTINDIQUÉ
DANS LE PRÉSENT MANUEL OU DANS DES SUPPLÉMENTS
PUBLIÉS PAR SONY.

1 (P)
SAFETY CHECK-OUT
After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
1. Checktheareaofyourrepair forunsolderedorpoorly-soldered
connections.Check the entireboard surface forsolder splashes
and bridges.
2. Checktheinterboardwiringtoensurethatnowiresare“pinched”
or contact high-wattage resistors.
3. Checkthatallcontrolknobs,shields,covers,groundstraps,and
mounting hardware have been replaced. Be absolutely certain
that you have replaced all the insulators.
4. Lookforunauthorizedreplacementparts,particularlytransistors,
thatwereinstalledduringapreviousrepairPointthemouttothe
customer and recommend their replacement.
5. Look for parts which, though functioning, show obvious signs
ofdeterioration.Pointthemouttothecustomerandrecommend
their replacement.
6. Check the line cord for cracks and abrasion. Recommend the
replacement of any such line cord to the customer.

1
TABLE OF CONTENTS
1. OPERATING INSTRUCTIONS ....................................................... 1-1
2. CIRCUIT ADJUSTMENTS
2-1. Preparations.................................................................................................. 2-1
2-2. B Board Adjustments ................................................................................... 2-2
3. CIRCUIT DESCRIPTIONS ............................................................... 3-1
4. SEMICONDUCTORS ........................................................................... 4-1
5. EXPLODED VIEWS
5-1. Main Unit ..................................................................................................... 5-2
6. ELECTRICAL PARTS LIST.............................................................. 6-1
7. BLOCK DIAGRAMS
7-1. B Block Diagram.......................................................................................... 7-1
7-2. GC Block Diagram....................................................................................... 7-2
8. DIAGRAMS
8-1. Printed Wiring Boards/Schematic Diagrams ............................................... 8-1
B ..................................................................................................... 8-2
GC ..................................................................................................... 8-6