Jvc KDS 687 Service Manual

Page 1

KD-5687

JVB

SERVICE MANUAL

CD RECEIVER

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DIGITAL AUDIO
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PLAYBACK

Area Suffix
UR ------------------- Brazil
Contents
Safety precaution ------------------------ 1-2 Flow of functional
Preventing static electricity ------------ 1-3 operation unit TOC read ---------- 1-12
Disassembly method ------------------- 1-4 Maintenance of laser pickup -------- 1-14
Adjustment method -------------------- 1-11 Replacement of laser pickup 1-14
Description of major ICs ---------------- 1-15~ 26
No.49737

COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
Apr. 2002

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KD-8687

Safety precaution

A 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.

A CAUTION Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.

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KD-8687

I PT6523LQ(IC601) :

1.Terminal layout

~ 33
32

17
~ 16

2.Block diagram

3.Piin function

COMMON
DRIVER

CLOCK
GENERATOR

ADDRESS
DEFECTOR

SEGMENT DRIVER & LATCH

SHIFT REGISTER

Pin No. Pin Name l/O Description
1~ 52 SG1 ~ SG52 0 Segment Output Pins
53~55 COM1 ~ COM3 0 Common Driver Output Pins
56 VDD - Power Supply
Display OFF Control Input Pin
57 W When this pin is Low", the Display is forcibly
I turned OFF. (8G1 to SG52, COM1 to COMB are
set to "LOW"). (See Note 1)
When this pin is set to "High", the Displa is ON.
58 VDD1 | Used for the 2/3 Bias Voltage when the Bias Voltages
are provied externally. Connect to VDD2 when
1/2 Bias is used.
59 VDDZ | Used for 1/3 Bias Voltage when the Bias Voltages
are provided extemally. Connect to VDDl when
1/2 Bias is used.
60 V88 - Ground Pin.
61 080 l/O Oscillation Input /Outout Pin
62 CE I Chip Enable Pin
63 CLK l Synchronization Clock
64 BI l Transfer Data Pin

Note 1. When lNH = LOW" : Serial data trensfers can be performed when the display is forcibly OFF.

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