Jvc CHX 470 RF Service Manual
This is the 36 pages manual for Jvc CHX 470 RF Service Manual.
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Extracted text from Jvc CHX 470 RF Service Manual (Ocr-read)
Page 1
CH-X470RF 1-2 ! 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. Safety precaution ! Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.
Page 2
CH-X470RF 1-3 Preventing static electricity 1.Grounding to prevent damage by 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. 2.About the earth processing for the destruction prevention by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players. Be careful to use proper grounding in the area where repairs are being performed. 2-1 Ground the workbench 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. 2-2 Ground yourself Use an anti-static wrist strap to release any static electricity built up in your body. 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. 4.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 Attention when traverse unit is decomposed 1.Solder is put up before the card wire is removed from connector on the CD substrate as shown in Figure. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.) 2.Please remove solder after connecting the card wire with when you install picking up in the substrate.*Please refer to "Disassembly method" in the text for pick-up and how to detach the substrate. (caption) Anti-static wrist strap Conductive material (conductive sheet) or iron plate Soldering Pickup unitTraverse mechanism PCB Ass'y
Page 29
CH-X470RF 1-30 1 28 Vcc 7 OUT2 6 -IN2 5 +IN2 OUT1 1 -IN1 2 +IN1 3 VEE 4 BA15218F-XE (IC101) : Dual operation amplifier 1. Pin layout 2. Block diagram Q19 Q17 Q16 OTHER CH R9 R6 R8 R7 R5 R4 R3 R2R1 D1 C1Q18 Q13 Q11 Q8 Q5 Vcc VEE OUTPUT -IN +INQ1 Q3 Q4Q2 C2Q9 Q6 Q7 Q10 Q12 Q14 Q15Q114