SA-VK61DGS

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SA-VK61DGS 1 Safety precautions 2 Before Repair and Adjustment Disconnect AC power, discharge Power Supply Capacitors C531~C534, C588~C589, C598~C599 and C954 through a 10Ω, 5W resistor to ground. DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices. After repairs are completed, restore power gradually using a variac, to avoid overcurrent. Current consumption at AC 110/127/220~230V, 50/60 Hz in NO SIGNAL (vol. min, at CD mode) & AC 240 V, 50 Hz should be ~770mA . 3 Protection Circuitry The protection circuitry may have operated if either of the following conditions are noticed: · No sound is heard when the power is turned on. · Sound stops during a performance. The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are “shorted”, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used. If this occurs, follow the procedure outlines below: 1. Turn off the power. 2. Determine the cause of the problem and correct it. 3. Turn on the power once again after one minute. Note : When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again. 4
SA-VK61DGS 4 Safety Precautions 4.1. General Guidelines 1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit. 2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly installed. 3. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards. 4.1.1. Leakage Current Cold Check 1. Unplug the AC cord and connect a jumper between the two prongs on the plug. 2. Measure the resistance value, with an ohmmeter, between the jumpered AC plug and each exposed metallic cabinet part on the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the chassis, the reading should be between 1MΩ and 5.2MΩ. When the exposed metal does not have a return path to the chassis, the reading must be . 4.1.2. Leakage Current Hot Check (See Figure 1) Figure 1 1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check. 2. Connect a 1.5kΩ, 10 watts resistor, in parallel with a 0.15µF capacitor, between each exposed metallic part on the set and a good earth ground such as a water pipe, as shown in Figure 1. 3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor. 4. Check each exposed metallic part, and measure the voltage at each point. 5. Reverse the AC plug in the AC outlet and repeat each of the above measurements. 6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent) may be used to make the hot checks, leakage current must not exceed 1/2 milliamp. In case a measurement is out of the limits specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to the customer. 5 Prevention of Electro Static Discharge (ESD) to Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage caused by electro static discharge (ESD). 1. Immediately before handling any semiconductor component or semiconductor-equiped assembly, drain off any ESD on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap, which should be removed for potential shock reasons prior to applying power to the unit under test. 2. After removing an electrical assembly equiped with ES devices, place the assembly on a conductive surface such as aluminium foil, to prevent electrostatic charge build up or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ES devices. 4. Use only an anti-static solder remover device. Some solder removal devices not classified as “anti-static (ESD protected)” can generate electrical charge to damage ES devices. 5
Page 1 and 2: ORDER NO. MD0406277C3 SA-VK61DGS Co
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Page 9 and 10: SA-VK61DGS 9 Accessories Remote con
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Page 15 and 16: SA-VK61DGS · You can also play dig
Page 17 and 18: SA-VK61DGS 13 Procedure for repairi
Page 19 and 20: SA-VK61DGS Cause 3 Possible fault 3
Page 21 and 22: SA-VK61DGS While pressing & hold
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Page 25 and 26: SA-VK61DGS 15.4. DVD/CD Self-Diagno
Page 27 and 28: SA-VK61DGS Item Measurement of CD l
Page 29 and 30: SA-VK61DGS 16 Cautions To Be Taken
Page 31 and 32: SA-VK61DGS 17 Disassembly and Assem
Page 33 and 34: SA-VK61DGS Step 1 Insert the gear t
Page 35 and 36: SA-VK61DGS Step 2 Remove 2 screws a
Page 37 and 38: SA-VK61DGS 17.8.1. Replacement of t
Page 39 and 40: SA-VK61DGS · Note for installation
Page 41 and 42: SA-VK61DGS Step 6 Insert the gear w
Page 43 and 44: SA-VK61DGS Step 11 Lift up the left
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Page 47 and 48: SA-VK61DGS Step 1 Install the trave
Page 49 and 50: SA-VK61DGS Step 14 Install the tray
Page 51 and 52: SA-VK61DGS Step 14 Remove 2 screws.
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SA-VK61DGS 18 Measurements and Adju
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SA-VK61DGS 18.3. Alignment Points 1
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SA-VK61DGS 1~8, 18~25 26 A15 A0 XCE
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SA-VK61DGS TO MAIN BLOCK C 2 VMUTE1
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SA-VK61DGS IC1001 AN7348S-E1 P.B. E
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IC307 C1BB00000782 6 CHANNEL VOLUME
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SA-VK61DGS FR_L(R) 21(20) L IN(R) L
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20.1. (A) DVD Module (1) Circuit R2
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SA-VK61DGS 20.2. (B) DVD Module (2)
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SA-VK61DGS SCHEMATIC DIAGRAM - 5 DV
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SA-VK61DGS SCHEMATIC DIAGRAM - 11 D
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SA-VK61DGS SCHEMATIC DIAGRAM - 15 M
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C50 10V220 C51 16V47 C52 16V47 C53
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SA-VK61DGS SCHEMATIC DIAGRAM - 27 P
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SA-VK61DGS SCHEMATIC DIAGRAM - 31 T
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21 Printed Circuit Board 21.1. (A)
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SA-VK61DGS G H I J K L M L2001 129
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G H I J K L M C3059 C3019 3020 C301
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G H I J K L M JK304 C209 35 IC302 I
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SA-VK61DGS 21.5. (E) Panel P.C.B. A
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SA-VK61DGS 21.6. (H) Tuner P.C.B. &
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SA-VK61DGS 21.8. (L) Power Supply P
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SA-VK61DGS 21.9. (M) Power P.C.B. A
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SA-VK61DGS 21.10. (N) Transformer P
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SA-VK61DGS 21.12. (Q) CD Loading P.
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. SA-VK61DGS Q CD LOADING P.C.B. P
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SA-VK61DGS 24 Terminal Function of
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SA-VK61DGS 25.1. Deck Mechanism (RA
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SA-VK61DGS 25.1.2. Deck Mechanism P
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SA-VK61DGS 25.2.2. CD Loading Mecha
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SA-VK61DGS 25.3.2. Cabinet Parts Li
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SA-VK61DGS Ref. No. Part No. Part N
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SA-VK61DGS 25.6. Packaging 155 PRT0
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