Jvc XVS 45 GD Service Manual
This is the 38 pages manual for Jvc XVS 45 GD Service Manual.
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Extracted text from Jvc XVS 45 GD Service Manual (Ocr-read)
Page 1
XV-S40BK/XV-S42SL/XV-S45GD/XV-S30BK 1-2 Safety Precautions 1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only. 2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom. 3. Many electrical and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards. 4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after reassembling. 5. Leakage current check (Electrical shock hazard testing) After reassembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock. Do not use a line isolation transformer during this check. Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage current from each exposed metal parts of the cabinet , particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.) Alternate check method Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. voltage measured Any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 Warning 1. This equipment has been designed and manufactured to meet international safety standards. 2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained. 3. Repairs must be made in accordance with the relevant safety standards. 4. It is essential that safety critical components are replaced by approved parts. 5. If mains voltage selector is provided, check setting for local voltage. Good earth groundPlace this probe on each exposed metal part. AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE ! CAUTION Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.
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XV-S40BK/XV-S42SL/XV-S45GD/XV-S30BK 1-3 Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs. 1.1. Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players. Be careful to use proper grounding in the area where repairs are being performed. 1.1.1. Ground the workbench 1. Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it. 1.1.2. Ground yourself 1. Use an anti-static wrist strap to release any static electricity built up in your body. 1.1.3. Handling the optical pickup 1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.) 2. Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily destroy the laser diode. 1.2. Handling the traverse unit (optical pickup) 1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. 2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector. 3. Handle the flexible cable carefully as it may break when subjected to strong force. 4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it Conductive material (conductive sheet) or iron plate (caption) Anti-static wrist strap
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XV-S40BK/XV-S42SL/XV-S45GD/XV-S30BK 1-23 CLK ADO LCKE CLK CKE CS RAS CAS WE L(U)DQMLRAS LCBR LWE LCAS LWCBRLDQMLW E LDQM DQI LCBR LRAS Bank Select Address Register Row Decoder Col.Buffer Output Buffer I/O Control Row Buffer Refresh Counter Data input register 512K x 16 512K x 16 Sense AMP Column decoder Latency & burst length Programming register Timing register 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 2550 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 VDD DQ0 DQ1 VSSQ DQ2 DQ3 VDDQ DQ4 DQ5 VSSQ DQ6 DQ7 VDDQ LDQM WE CAS RAS CS A11 A10 A0 A1 A2 A3 VDDVSS DQ15 DQ14 VSSQ DQ13 DQ12 VDDQ DQ11 DQ10 VSSQ DQ9 DQ8 VDDQ NC UDQM CLK CKE NC A9 A8 A7 A6 A5 A4 VSS 1.Terminal Layout 2.Block Diagram 3.Pin Function 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25VDD DQ0 DQ1 VSSQ DQ2 DQ3 VDDQ DQ4 DQ5 VSSQ DQ6 DQ7 VDDQ LDQM WE CAS RAS CS A11 A10 A0 A1 A2 A3 VDD26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50VSS A4 A5 A6 A7 A8 A9 NC CKE CLK UDOM NC VDDQ DQ8 DQ9 VSSQ DQ10 DQ11 VDDQ DQ12 DQ13 VSSQ DQ14 DQ15 VSS Power Supply Data Input/Output Data Input/Output To Ground Data Input/Output Data Input/Output Power Supply Data Input/Output Data Input/Output To Ground Data Input/Output Data Input/Output Power Supply Data Input/Mask Output Write Enable Column Address Strobe Raw Address Strobe Chip Select Address Address Address Address Address Address Power SupplyTo Ground Address Address Address Address Address Address Non Connection Clock Enable System Clock Data Input/Mask Output Non Connection Power Supply Data Input/Output Data Input/Output To Ground Data Input/Output Data Input/Output Power Supply Data Input/Output Data Input/Output To Ground Data Input/Output Data Input/Output To Ground Pin No. Symbol Function Pin No. Symbol Function KM416S1120DT-G8(IC504,IC505):DRAM
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XV-S40BK/XV-S42SL/XV-S45GD/XV-S30BK 1-35 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128O O - - O O O - - O O O O O O - - O O O I - - I - I I I I I - - I O O O O O - - I/O O O - Pin No. Symbol MADDR6 MADDR5 VDD VSS MADDR4 MWE SD-CAS VDD VSS SD-RAS SD-CS0 SD-CS1/MADDR11 SD-BS MADDR10 MADDR0 VDD VSS MADDR1 MADDR2 MADDR3 RESERVED NC NC RESERVED NC RESERVED RESERVED RESERVED DAI-LRCK DAI-BCK VDD VSS DAI-DATA DA-DATA3 DA-DATA2 DA-DATA1 DA-DATA0 DA-LRCK VDD VSS DA-XCK DA-BCK DA-IEC VDDI/O Description 2.Pin function (3/5) SDRAM address SDRAM address Power supply terminal 2.5V Connect to ground SDRAM address SDRAM write enable Active LOW SDRAM column address Power supply terminal 3.3V Connect to ground Active LOW SDRAM row address Active LOW SDRAM chip select 0 Active LOW SDRAM chip select 1 or use as MADDR11 for larger SDRAM SDRAM bank select SDRAM address SDRAM address Power supply terminal 3.3V Connect to ground SDRAM address SDRAM address SDRAM address Tie to VSS or VDD_3.3 as specified in table1 Non connect Non connect Tie to VSS or VDD_3.3 as specified in table1 Non connect Tie to VSS or VDD_3.3 as specified in table1 Tie to VSS or VDD_3.3 as specified in table1 Tie to VSS or VDD_3.3 as specified in table1 PCM left/right clock PCM input bit clock Power supply 3.3V Connect to ground PCM data input PCM data output. Eight channels. Serial audio samples relative to DA_BCK and DA_LRCK PCM data output. Eight channels. Serial audio samples relative to DA_BCK and DA_LRCK PCM data output. Eight channels. Serial audio samples relative to DA_BCK and DA_LRCK PCM data output. Eight channels. Serial audio samples relative to DA_BCK and DA_LRCK PCM left clock. Identifies the channel for each sample Power supply terminal 3.3V Connect to ground Audio external frequency clock input or output PCM bit clock output PCM data out in IEC-958 format or compressed data out in IEC-1937 format Power supply terminal 2.5V