Sony slv 679 hf service manual

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Ñ 2 Ñ SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! 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 Ë LA SƒCURITƒ! LES COMPOSANTS IDENTIFƒS PAR UNE MARQUE ! SUR LES DIAGRAMMES SCHƒMATIQUES ET LA LISTE DES PIéCES SONT CRITIQUES POUR LA SƒCURITƒ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIéSES SONY DONT LES NUMƒROS SONT DONNƒS DANS CE MANUEL OU DANS LES SUPPƒMENTS PUBLIƒS PAR SONY. SAFETY CHECK-OUT After correcting the original service problem, perform the following safety checks before releasing the set to the customer. 1. Check the area of your repair for unsoldered or poorly-soldered connections. Check the entire board surface for solder splashes and bridges. 2. Check the interboard wiring to ensure that no wires are "pinched" or contact high-wattage resistors. 3. Look for unauthorized replacement parts, particularly transistors, that were installed during a previous repair. Point them out to the customer and recommend their replacement. 4. Look for parts which, though functioning, show obvious signs of deterioration. Point them out to the customer and recommend their replacement. 5. Check the line cord for cracks and abrasion. Recommend the replacement of any such line cord to the customer. 6. Check the B+ voltage to see it is at the values specified. 7. 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 TW-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 0.75V, 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 Exposed Metal Parts on Set 0.15 µF 1.5 k ½ AC Voltmeter (0.75 V) Earth Ground Fig. A. Using an AC voltmeter to check AC leakage.

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Ñ 3 Ñ TABLE OF CONTENTS SERVICE NOTE 1. ERROR CODE INDICATION ááááááááááááááááááááááááááááááááááááááááááá 4 1. GENERAL Index to parts and controls ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááá 1-1 Step 1 Unpacking ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááááááá 1-2 Step 2 Setting up the remote commander áááááááááááááááááááááááááááááááááá 1-2 Step 3 Hookups ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááááááááááááááá 1-3 Selecting a language ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááá 1-7 Setting the clock ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááááááááá 1-7 Presetting channels ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááááá 1-9 Setting up the VCR Plus+ system áááááááááááááááááááááááááááááááááááááááááááá 1-11 Playing a tape ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááááááááááá 1-12 Recording TV programs ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááá 1-13 Recording TV programs using the VCR Plus+ system ááááááááááá 1-13 Setting the timer manually ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááá 1-14 Playing/searching at various speeds áááááááááááááááááááááááááááááááááááááááá 1-15 Setting the recording duration time ááááááááááááááááááááááááááááááááááááááááá 1-15 Checking/changing/canceling timer settings ááááááááááááááááááááááááááá 1-16 Recording stereo and bilingual programs áááááááááááááááááááááááááááááááá 1-16 Adjusting the picture ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááááá 1-17 Changing menu options ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááá 1-17 Editing with another VCR ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááá 1-17 General setup information ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááá 1-18 Troubleshooting ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááááááááááááá 1-18 2. DISASSEMBLY 2-1. UPPER CASE, PANEL BLOCK ASSEMBLY áááááááááááááááááá 1 2-2. DS-84 BOARD ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááááááááá 1 2-3. REAR PANEL ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááááá 2 2-4. MA-341 BOARD ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááááá 2 2-5. MECHANISM DECK ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááá 3 2-6. INTERNAL VIEWS ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááá 4 2-7. CIRCUIT BOARDS LOCATION áááááááááááááááááááááááááááááááááááááá 5 3. BLOCK DIAGRAMS 3-1. OVERALL BLOCK DIAGRAM áááááááááááááááááááááááááááááááááááá 3-1 3-2. VIDEO BLOCK DIAGRAM áááááááááááááááááááááááááááááááááááááááááá 3-3 3-3. SERVO/SYSTEM CONTROL BLOCK DIAGRAM ááááá 3-5 3-4. AUDIO/TUNER BLOCK DIAGRAM ááááááááááááááááááááááááááá 3-7 3-5. POWER BLOCK DIAGRAM ááááááááááááááááááááááááááááááááááááááááá 3-9 4. PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS 4-1. FRAME SCHEMATIC DIAGRAM áááááááááááááááááááááááááááááááá 4-3 4-2. PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááááá 4-5 ¥ MA-341(1/7) (VIDEO) SCHEMATIC DIAGRAMS ááááááááááááááááááááááá 4-5 ¥ MA-341(2/7) (AUDIO) SCHEMATIC DIAGRAMS ááááááááááááááááááááááá 4-7 ¥ MA-341(3/7) (SERVO/SYSTEM CONTROL) SCHEMATIC DIAGRAMS ááááááááááááááááááááááá 4-9 ¥ MA-341(4/7) (AUDIO PROCESS) SCHEMATIC DIAGRAMS ááááááááááááááááááááá 4-11 ¥ MA-341(5/7) (TUNER) SCHEMATIC DIAGRAMS ááááááááááááááááááááá 4-13 ¥ MA-341(6/7) (MODE CONTROL) SCHEMATIC DIAGRAMS ááááááááááááááááááááá 4-15 ¥ MA-341(7/7) (POWER SUPPLY) SCHEMATIC DIAGRAMS ááááááááááááááááááááá 4-17¥ MA-341 (VIDEO, AUDIO, SERVO/SYSTEM CONTROL, TUNER, POWER SUPPLY) PRINTED WIRING BOARD áááááááááááááááááá 4-19 ¥ DS-84 (TAPE OPARATION) SCHEMATIC DIAGRAMS ááááááááááááááááááááá 4-22 ¥ DS-84 (TAPE OPERATION) PRINTED WIRING BOARD áááááááááááááááááá 4-22 5. INTERFACE, IC PIN FUNCTION DESCRIPTION 5-1. SYSTEM CONTROL Ð MECHANISM BLOCK INTERFACE (MA-341 BOARD IC160) ááááááááááááááááááááááááááááááááááááááááááááááá 5-1 5-2. SYSTEM CONTROL Ð SERVO PERIPHERAL CIRCUIT INTERFACE (MA-341 BOARD IC160) ááááááááááááááááááááááááááááááááááááááááááááááá 5-1 5-3. SYSTEM CONTROL Ð SYSTEM CONTROL PERIPHERAL CIRCUIT INTERFACE (MA-341 BOARD IC160) ááááááá 5-2 5-4. SYSTEM CONTROL AND RF MODULATOR Ð INPUT SELECTION BLOCK INTERFACE (MA341 BOARD IC160) áááááááááááááááááááááááááááááááááááááááááááááááá 5-2 5-5. SYSTEM CONTROL Ð VIDEO/RP BLOCK INTERFACE (MA-341 BOARD IC160) ááááááááááááááááááááááááááááááááááááááááááááááá 5-2 5-6. SYSTEM CONTROL Ð AUDIO BLOCK INTERFACE (MA-341 BOARD IC160) ááááááááááááááááááááááááááááááááááááááááááááááá 5-2 5-7. SERVO/SYSTEM CONTROL MICROPROCESSOR PIN FUNCTIONS (MA-341 BOARD IC160) áááááááááááááááá 5-3 6. ADJUSTMENTS 6-1 MECHANICAL ADJUSTMENTS ááááááááááááááááááááááááááááááááá 6-1 6-2. ELECTRICAL ADJUSTMENTS ááááááááááááááááááááááááááááááááááá 6-1 1. PREPARATION BEFORE ADJUSTMENT ááááááááááááááááááá 6-1 1-1. Equipment Required ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááá 6-1 1-2. Equipment Connection ááááááááááááááááááááááááááááááááááááááááááááááááááá\ á 6-1 1-3. Set-up of Adjustment ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááá 6-1 1-4. Alignment Tape ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááááá 6-1 1-5. Input/Output Levels and Impedance ááááááááááááááááááááááááááááááá 6-2 1-6. Adjustment Sequence ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááá 6-2 2. POWER SUPPLY CHECK ááááááááááááááááááááááááááááááááááááááááááááá 6-2 2-1. Output Voltage Check (MA-341 Board) ááááááááááááááááááááááááá 6-2 3. SERVO SYSTEM CHECK ááááááááááááááááááááááááááááááááááááááááááááá 6-3 3-1. RF Switching Position Adjustment (MA-341 Board) ááááá 6-3 4. AUDIO SYSTEM ADJUSTMENT ááááááááááááááááááááááááááááááááá 6-3 4-1. Hi-Fi Audio System Adjustment (Hi-Fi model only) áááááá 6-3 4-2. HiFi Switching Position Adjustment (MA-341 Board) ááá 6-4 4-3. Normal Audio System Adjustment áááááááááááááááááááááááááááááááááá 6-4 4-3-1. ACE Head Adjustment ááááááááááááááááááááááááááááááááááááááááááááááááááá\ á 6-4 4-3-2. E-E Output Level Check ááááááááááááááááááááááááááááááááááááááááááááááááá 6-4 4-3-3. Frequency Response Check ááááááááááááááááááááááááááááááááááááááááááááá 6-4 5. ADJUSTING PARTS LOCATION DIAGRAM ááááááááááááá 6-6 7. REPAIR PARTS LIST 7-1. EXPLODED VIEWS ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááá 7-1 7-1-1. FRONT PANEL AND UPPER CASE SECTION áááááááááá 7-1 7-1-2. CHASSIS SECTION ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááá 7-2 7-1-3. MECHANISM DECK SECTION-1 ááááááááááááááááááááááááááááááá 7-3 7-1-4. MECHANISM DECK SECTION-2 ááááááááááááááááááááááááááááááá 7-4 7-1-5. MECHANISM DECK SECTION-3 ááááááááááááááááááááááááááááááá 7-5 7-2. ELECTRICAL PARTS LIST áááááááááááááááááááááááááááááááááááááááááá 7-6