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Extracted text from Jvc KDSC 900 R Service Manual (Ocr-read)
Page 1
KD-SC900R
1-2 (No.49829)
SECTION 1
Important Safety Precautions
1.1 Safety Precautions
! 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.
! Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.
Page 2
KD-SC900R
(No.49829)1-3 1.2 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.
1.2.1 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) 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) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(3) Handling the optical pickup
- 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.)
- 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.
1.3 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) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.4 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the CD pickup unit.
- Apply solder to the short land before the flexible wire is disconnected from the connector on the CD pickup unit.
(If the flexible wire is disconnected without applying solder, the CDpickup may be destroyed by static electricity.)
- In the assembly, be sure to remove solder from the short land after connecting the flexible wire.
1M
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
PickupShort-circuit point
(Soldering)
Flexible wire
Pickup
Short-circuit point
KD-SC900R
(No.49829)1-45 - Pin functions
Pin No Symbol I/O Functions
1 /RESET I Hard reset input H:normal L:reset
2 MiMD I Micon I/F mode select input
3 /MiCS I Micon I/F chip select input
4 /MiLP I Micon I/F latch palus input
5 MiDio I/O Micon I/F data input/output
6 /MiCK I Micon I/F clock input
7 MiACK O Micon I/F acknowledge output
8 VDDT - Power supply for digital (3.3V)
9 SDo O Data output
10 BCKo O Bit output
11 LRCKo O LR clock output
12 SDiO I Data input 0
13 BCKiA I Bit clock input A
14 LRCKiA I LR clock input A
15 SDiL I Data input terminal 1
16 BCKiB I Bit clock input terminal B
17 LRCKiB I LR clock input terminal B
18 VDD - Power supply for digital (2.5V)
19 STANBY I Standby mode control input H:STBY L:normal
20 VSS - GND for digital
21 VSSL - GND for DAC Lch
22 VRAL - Reference voltage for DAC Lch
23 LO O DAC Lch output
24,25 VDAL,VDAR - Power supply for DAC Lch/Power supply for DAC Rch (2.5V)
26 RO O DAC Rch output
27 VRAR - Reference voltage for DAC Rch
28 VSSR - GND for DAC R ch
29 TESTP I Test terminal H:test mode L:normal
30 TXO O SPDIF output
31~34 Po0~Po3 O General purpose output 0 ~ 3
35 VDDT - Power supply for digital (3.3V)
36~38 Po4~Po6 O General purpose output 4 ~ 6
39 REQ O REC terminal
40 VSS - GND for digital
41 IRO I/O External interrupt input
42 VDDM - Internal 1Mbit SRAM power supply (2.5V)
43,44 Fi0,Fi1 I Flug input 0,1
45 VSSM - GND for internal 1Mbit SRAM
46,47 Pi0,Pi1 I General ourpose input 01
48 VSS - GND for digital
49,50 Pi2,Pi3 I General purpose input 23
51 Pi4/CLCL I General purpose input 4/SUBQ I/F clock inputoutput
52 VDD - Power supply for digital (2.5V)
53 Pi5/DATA I General purpose input 5/SUBQ I/F data input
54 TSTiN/SFSY I Test terminal/SUBQ I/F flame sync input
55 Fi2/SBSY I Flug input 2/SUBQ I/F block sync input
56 VSSP - GND for VCO
57 Pdo O PLL phase error detection signal output
58 Vcoi I VCO control voltage input
59 VDDP - Power supply for VCO (2.5V)
60 CKo/CKi I/O External clock input/Clock output terminal
61 VDDX - Power supply for X'tal oscillator (2.5V)
62,63 Xi,Xo I,O Oscillator connection terminal for input/output
64 VSSX - GND for oscillator
