Sony CDP-270, CDP-335, CDP-400, CDP-450 Schematic
S®
CD
Changer
Models: CDP-CX235
CDP-CX270
CDP-CX335
CDP-CX400
CDP-CX450
Training Manual
Circuit Description and Troubleshooting
Course: A-122
Sony Service Company
A Division of Sony Electronics Inc ©2000
All Rights Reserved
Printed in U.S.A.
S is a trademark of Sony Electronics
Circuit Description
and Troubleshooting:
Models: CDP-CX235
CDP-CX270
CDP-CX335
CDP-CX400
CDP-CX450
Prepared by: National Training Department
Sony Service Company
A Division of Sony Electronics Inc.
Course presented by _____________________________________
Date___________________________________________________
Student Name ___________________________________________
Table of Contents
Overall Block Diagram 3
Information Gathering 3
CD Playback 3
Power Supply / Display 5
Power Supply 5
Fluorescent Display 7
Power On 11
AC Power Only 11
Power ON 11
Communications IC501 - IC701 11
Communications IC501 - IC101 13
Door Motor Drive 15
Operation 15
Drive 15
Tray Table Motor Drive 21
CD Location & Label Storage 23
Disc Loading Drive 27
Operation 27
Motor Stop 27
Optical Pickup 29
The Laser and Lens 29
Focus Coil 29
Tracking Coil 29
Detector Outputs 29
Servo / Audio Processing Block 31
Servo Block 31
Sled Motor 31
Focus Servo 31
Feedback 15
Tray Table Positioning 17
Tray Table Slots 17
Light Sensors 17
Table Motor Drive 19
Front Panel Rotary Encoder - Operation 19
Direction of Rotation 19
Tray Table Position Sensors 19
Tracking Servo 33
Spindle Motor 33
Audio Block 33
Servo Processing 35
Sled Motor Drive 35
Laser 35
Focus 35
Tracking Servo 35
Spindle Servo 37
APPENDIX
Audio / Display Output 39
Analog Audio Output 39
Digital Output 39
Display 39
Troubleshooting 41
Disc Doesn’t Spin 42
Servo Processing Diagram 43
Focus 44
Disc Won’t Spin Flowchart 45
Disc Spins, But Doesn’t Read the Disc’s
Table of Contents (TOC) 47
RF Output 47
Tracking Servo 47
Disc Spins, But Does Not Read TOC Flowchart 48
Spindle Servo 49
Control A Communications for Additional Features i
Defective Discs iii
Troubleshooting Using the RFO Waveform v
Abbreviations Used in Compact Disc Player vi
No Audio 50
Optical Assembly Tests 51
S Curve Check 51
E-F Balance Check 51
RFO Level Check 52
1
)
CD Mega Changer Product Line (USA
Model Disc List
Capacity Price Cd Mech BD Board List Price Optical Assembly / Part number List Price
All of these numbers sub to 8-848-379-31
2000
CDP-CX235 200 170.00$ CDM-40B A4724029A $76.15 KSS-213BNK / 8-848-379-31 82.12$
CDP-CX270 200 $1,000 CDM-40B A4699163A $112.01 KSS-213B / 8-848-376-01 82.12$
CDP-CX335 300 300.00$ CDM-54-KIBD35E A4724761A $82.12 KSS-213BFN / 8-848-379-31 82.12$
CDP-CX400 400 360.00$ CDM-62-K1BD35A A4724761A $82.12 KSM-213BFN / 8-820-026-03 * 82.12$
CDP-CX450 400 480.00$ CDM-62-K1BD35A A4724761A KSM-213BFN / 8-820-026-03 * 82.12$
*use ’CX335 manual for part number
1999 of spindle or sled motor
CDP-CX225 200 250.00$ CDM-40 A4699038A $112.01 KSS-213B / 8-848-376-01 82.12$
CDP-CX230 200 300.00$ CDM-40B A4724029A $76.16 KSS-213BNK / 8-848-379-31 82.12$
CDP-CX270 200 $1,000 CDM-40 A4699038A $112.01 KSS-213B / 8-848-376-01 82.12$
CDP-CX300 300 360.00$ CDM-54-KIBD35E A4724761A $82.12 KSS-213BFN / 8-848-379-31 82.12$
CDP-CX350 300 480.00$ CDM-54-KIBD35E A4724761A KSS-213BFN / 8-848-379-31 82.12$
CDP-CX691 300 CDM-54-KIBD35E A4724761A KSS-213BFN / 8-848-379-31 82.12$
1998
CDP-CX210 200 CDM-40 A4699038A $112.01 KSS-213B / 8-848-376-01 82.12$
CDP-CX220 200 CDM-40B A4724029A $76.16 KSS-213BNK / 8-848-379-31 82.12$
CDP-CX240 200 CDM-40B A4724029A KSS-213BNK / 8-848-379-31 82.12$
CDP-CX260 200 CDM-40B A4724029A KSS-213BNK / 8-848-379-31 82.12$
CDP-CX270 200 CDM-40 A4699038A $112.01 KSS-213B / 8-848-376-01 82.12$
CDP-CX90ES 200 $1,100 CDM-40 A4699038A KSS-213B / 8-848-376-01 82.12$
List Prices are as of 7/1/00
Introduction
This training manual is based upon the model CDP-CX235 CD Changer.
This model is the entry changer in the “Mega” Changer product line for
the year 2000. The “2” in the model number refers to the 200 disc capacity of these Changers. These 200 series models are mechanically complex so there are more CD transport and mechanical adjustments to be
made.
The concepts and circuitry in this 200 disc model are similar to the 300
disc CDP-CX300 series and 400 disc CDP-CX400 series CD Changers.
In these larger capacity models, the CD transport and CD mechanism
use fewer parts. As a result, the higher capacity Changers require fewer
adjustments.
Generally, the electrical troubleshooting procedures and test modes outlined in this training manual can be applied to all of the changer models
listed for the last three years. This is because for troubleshooting purposes, they are electrically similar. Mechanically, the 200 disc Changers
use one basic chassis and the 300 and 400 disc Changers use another
chassis so the mechanical adjustments differ.
Model CDP-CX90ES/CDPCX-270
Model CDP-CX235
The board layout of the CDP-CX235 is shown. The bulk of the electronics
are on the rear main board. To its left in the vacant area is the CD mechanism housing the optical assembly and servo (BD) board. The small boards
along the bottom of the chassis hold the tray table and disc sensors. The
top illumination board houses 3 LEDs to light the disc compartment when
the CD Changer is powered on.
The model CDP-CX90ES/CDPCX-270 was carried over from the 1998
year because it was the only chassis that had the following major features:
• A video output for an on-screen display using a TV.
• A front panel jack that permitted a computer keyboard to be plugged
in. This allowed the user to label or re-label each CD slot location
quickly using the keyboard instead of the slower remote control
.
2
3
Overall Block Diagram
At the core of the 200 disc CD Changer is the System Control (Syscon)
IC501. IC501 serves as the interface between the user and the mechanism. Before IC501 can respond to the user’s commands for a disc to
play, it must know the following:
· If the Disc door is closed.
· If the CD Mechanism is in the chucked position.
· At which disc slot is the tray table is positioned.
Some of this information is stored in an external memory IC; the remainder IC501 will have to gather at power ON using the sensors and switches
linked to the Door, Tray Table and Loading Motors.
Information Gathering
Pressing the power ON button causes IC501 to use “IC SW” to switch on
regulator IC506. IC506 apples power to the BD board, which houses the
optical assembly. D+5V is also applied to the LED in the door compartment to inform the user power is ON.
After Syscon IC501 turns on power, IC501 accesses its external memory
IC. Data about the disc last loaded in the CD Mechanism is returned to
IC501. The disc label information is output as data to the FL Display IC
for display on the front panel fluorescent tube. If there was no label information, then just the disc’s number is displayed.
Syscon now takes a series of steps to check the memory information:
Once Syscon IC501 is confident the tray table information is valid, IC501
turns the CD Changer control over to the user by accepting pushbutton
commands.
The user can use the front panel controls to select another disc or play
that one. When Syscon knows the loading motor is in the chucked position (loading motor switch), the CD can be played.
CD Playback
Syscon IC501 initiates CD play by sending data, clock and latch communications to IC101 on the BD board. This causes IC101 to turn on the
laser, focus, tracking and spindle servos that employ the laser diode, along
with the focus coil, tracking coil, sled motor and spindle motor in the optical assembly.
Once these servos are operating, the disc information (RFO) is output.
RFO is received by Servo Control IC101 which:
• Converts the data back to the original modulation scheme (EFM).
• Error corrects the data (parity error correction).
• Reconstructs its original pattern (CIRC).
• Creates additional digital samples (oversampling) to reduce noise in
the final analog audio.
• Converts the signal from digital to analog form (D/A Converter).
1. Syscon activates the disc door motor to close the door if its corresponding switch indicates the door is open.
2. Next, Syscon checks the loading motor switch position to see if the
CD Mechanism is in the chucked position (disc loaded).
• If chucked, IC501 will initiate disc PB to read its TOC.
• If unchucked, IC501 will drive the tray table motor, rotating its discs
past the disc sensors. While the tray is rotating, the tray sensors
inform IC501 of the disc slot location while the disc sensor tells
IC501 if there is a disc present at that slot. The last disc played
according to memory will be loaded and its TOC read (if present).
Analog audio is output from IC101 to the rear panel jacks.
BD BOARD
OPTICAL
PICK-UP
ASSEMBLY
KSS213B
MAIN BD.
-28V
SOURCE
MEMORY
POWER
SUPPLY
FILAMENT
VOLTAGE
A-F
RF AMP
COIL &
MOTOR
DRIVER
FRONT
PANEL
BUTTONS
-13.5V SOURCE
+5V SOURCE
+11.5V
SOURCE
RFO
ERROR
SIGNAL
IC501
SYSTEM
CONTROL
IC101
SERVO
CONTROL/
DSP
IC
SW
IC506REG
/SW
LINE OUT
D
OUT
DIGITAL
OPTICAL
OUTPUT
JACK BD.
IC503
MOTOR
DRIVER
FL DATA,CLK,LATCH
DISC DOOR
LIGHT
D+5V
+7V
RESET
AUDIO
MUTE
M
DOOR
M
TRAY
M
LOADING
IC701
FL DISPLAY
DRIVER
TO BD BOARD
IC401
AUDIO
AMP
MUTE
RESET
FROM
IC506
SWITCH OR
SENSOR
FL DISPLAY
TUBE
DISPLAY BD.
L
R
AUDIO
OUTPUT
(JACK
BD.)
TO DISPLAY BD.
OVERALL BLOCK DIAGRAM (MODEL CDP-CX235)
4
0A122 1251
7/5/00
5
Power Supply / Display
Overview
The power supply stage produces seven voltages when the CD Changer
is plugged into AC. Some of these voltages from the main board power
the FL Driver microprocessor IC701 and the FL indicator tube on the display board.
Power Supply
Power Supply Output
Output Voltage From Destination
1. +11.5Vdc Bridge Rectifier
D501-4
2. 13.5Vdc Bridge Rectifier
D501-4
3. +5Vdc Source Regulator IC504 Syscon IC501 (not shown),
4. +5Vdc Bridge D501-4 &
Zener D508
5. Reset +5V Reset IC505 Syscon IC501 (not shown),
6. 3.7Vac Power Transformer
T901
7. -28V Q501/emitter Reference voltage for the
Regulator/Sw IC506,
+5V Regulator IC504,
Motor Driver IC503.
Audio mute transistors
(Q325/e, Q327/e and
Q425/e), Motor driver
IC503.
FL Driver IC701.
Mute transistors Q325/e,
Q327/e and Q425/e.
FL Driver IC701,
LED Driver IC702 (not
shown).
Fluorescent Display Tube
filament
Fluorescent Display
The positive output of the bridge rectifier is filtered by C501 to become the
+11.5V source voltage.
The negative output of the bridge rectifier is filtered by C502 to become
the –13.5V source voltage.
+5Volt Source
The +11.5V source voltage is reduced and regulated by IC504 to produce
the +5V source voltage for the CD Changer.
+5Vdc
The +11.5V source voltage is reduced by R505 and R508 and applied to
5.1 volt zener diode D508 for shunt regulation. Shunt regulation is when
a device like this variable resistance zener diode is placed in parallel with
the load. The zener diode resistance varies to keep the voltage at the
load reasonably stable.
This +5 volts that is output is used by the mute transistors Q325, Q327,
and Q425 to control the left and right channel audio muting at power ON
and OFF and when plugged and unplugged from AC.
D509 and C505 are used to insure there is sufficient voltage for the mute
operation when the unit is unplugged. C505 holds the +5V for the mute
transistors and diode D509 blocks this voltage from being used by the
loads on the 11.5V line (D509/anode).
Reset +5V
When the +5Volt Source voltage outputs regulator IC504, IC505 creates
a reset pulse using R506 and C507. Each one of these three parts has a
role in creating the reset pulse. When the source voltage is input IC505,
IC505 holds it output LOW for a fixed amount of time dependent upon
IC505’s design. This LOW grounds out C507 at the output. When the
IC505 releases ground, C507 is charged by R506 to +5V.
The reset output of IC505 is applied to the IC501 and IC701 microprocessors in this CD Changer. Generally, reset occurs when the reset input to
a device is held LOW while power (Vcc) is applied.
+11.5V Source / -13.5V Source
When the CD Changer is plugged into AC, this voltage is applied to the
primary winding of T901. The secondary winding that is center taped
applies 20.6Vac to a four-diode bridge rectifier designated D501 to D504.
L901
NOISE
FILTER
CHOKE
Ω
55
THERMAL
FUSE
MAIN BD.
T901
JACK
BD.
C502
1000
2Ω
D505
Ω
2
Ω
2
+
41
R502
D506
30V
3.7VAC
FILAMENT
VOLTAGE
R501
33k
Ω
-28V
-40V
P
Q501
D507
6.2V
IC505
PST994D
C503
100
+
IC504
REG
TA7805
+
D501-
D504
D509
R505
R508
D508
5.1V
+11.5V SOURCE TO: IC506
REGULATOR,
IC503 MOTOR DRIVER
+
+11.5V
C501
3300
-13.5V SOURCE TO: MUTE
TRANSISTORS Q325,Q327,
Q425 AND IC503 MOTOR DRIVER
C507
R506
SYSCON
IC501/30
C506
C505
+
14 2 3
15 1 1
JOG
BD.
13 3 2
115
+
7 9 9
+5V
SOURCE
(B+)
+5V TO MUTE
TRANSISTORS
Q325/E,Q327/E,
Q425/E
FL701 FL INDICATOR TUBE
1
-28V
65
R701
100k
-28V
7
RESET
+5V
+5V
2.5V p-p
OSC.2.48MHz
WORDS
GRIDS 1-15
DATA,
CLK FROM
SYSCON IC501
G16
N
Q701
55
56
VFL
60
FL DRIVER
MSM9202-03GS
VCC
64
OSC0
C702
G
1
P
(36)
LED DRIVER
M66310FP
+5V
DIG 16
IC701
OSC1
58
59
R706
SQ. WAVE
DISPLAY BD.
IC702
P1-36
G1-15
5V p-p
FRONT
PANEL
LED’s
POWER SUPPLY (CDP-CX235)
6
1A122 1238
7/7/00
7
When the output of IC505 is LOW, these microprocessors are held in
reset and are inactive (apparently dead).
3.7Vac
A low AC voltage from power transformer T901 is applied to the filament
of the fluorescent indicator tube FL701.
-28V
The 41-ohm secondary winding of transformer T901 produces 31.7Vac
that is rectified by D505. The –40Vdc produced is regulated by Q501
using zener diode D506 for voltage stabilization.
The –28Vdc output from regulator Q501/emitter is applied to the fluorescent driver stage as the negative supply voltage and to one end of the
filament via D507as the tube’s electron source.
Fluorescent Display
The FL701 Fluorescent Display tube needs the following to light a segment or a word in the tube:
• Filament voltage
• Positive voltage simultaneously applied to the grid and plate.
Basic Operation
The filament voltage comes from the power transformer T901 and the
positive pulses come from FL Driver IC701.
Just like a vacuum tube, the fluorescent display tube needs a source of
electrons. The electrons come from the filament, which is connected to
the –28V source. A controlling grid in the middle acts as a gate to determine if electrons should pass onto the plate to make it glow. At the gate,
a more positive voltage than the filament attracts the electrons and opens
the gate. A grid voltage that is the same as the filament will keep electrons from leaving the filament so there is no glow.
The plate structures will be phosphorescent when struck by electrons. To
get the electrons to the plate, the plate must have a positive voltage to be
attractive.
P1
Grid & Plate Array
Within the FL tube there are 16 grid structures, each containing 36 plates.
Each grid structure produces a character or number by luminating a combination of plates.
P3
P1
P2
P3
G1
P4
P5
P6
P1
P2
P3
G2
P4
P5
P6
Plate and Grid
Structures
To make a specific plate glow, a grid structure is selected and a positive
voltage is applied to it. At that time, the plate structures that must glow
are also brought positive. In the diagram above, when G1 and P3 lines
are brought HIGH, the P3 plate in the G1 structure will glow. Even though
the P3 structure in the G2 structure is connected in parallel, receiving the
same voltage, it will not glow because the G2 voltage is LOW at this time.
The job of FL Driver IC701 is to create and time the grid and plate pulses.
Fluorescent Driver IC701
When the CD Changer is plugged into AC, Vcc is applied to IC701/pin 64,
starting its internal oscillator. The R-C parts that set the frequency of this
2.48MHz oscillator (16MHz is on the schematic) are located at IC701/
pins 58 and 59.
Also at AC plug in, the FL Driver IC701 is momentarily reset. IC505 momentarily holds its output LOW when +5V is input. This LOW resets FL
Driver IC701 when Vcc (power) is present at pin 64. The LOW lasts for
0.2ms (IC505) + 0.8ms (C507) = 10ms.
Simple FL
P2
GridFilament
Plates
Tube
Structure
L901
NOISE
FILTER
CHOKE
Ω
55
THERMAL
FUSE
MAIN BD.
T901
JACK
BD.
C502
1000
2Ω
D505
Ω
2
Ω
2
+
41
R502
D506
30V
3.7VAC
FILAMENT
VOLTAGE
R501
33k
Ω
-28V
-40V
P
Q501
D507
6.2V
IC505
PST994D
C503
100
+
IC504
REG
TA7805
+
D501-
D504
D509
R505
R508
D508
5.1V
+11.5V SOURCE TO: IC506
REGULATOR,
IC503 MOTOR DRIVER
+
+11.5V
C501
3300
-13.5V SOURCE TO: MUTE
TRANSISTORS Q325,Q327,
Q425 AND IC503 MOTOR DRIVER
C507
R506
SYSCON
IC501/30
C506
C505
+
14 2 3
15 1 1
JOG
BD.
13 3 2
115
+
7 9 9
+5V
SOURCE
(B+)
+5V TO MUTE
TRANSISTORS
Q325/E,Q327/E,
Q425/E
FL701 FL INDICATOR TUBE
1
-28V
65
R701
100k
-28V
7
RESET
+5V
+5V
2.5V p-p
OSC.2.48MHz
WORDS
GRIDS 1-15
DATA,
CLK FROM
SYSCON IC501
G16
N
Q701
55
56
VFL
60
FL DRIVER
MSM9202-03GS
VCC
64
OSC0
C702
G
1
P
(36)
LED DRIVER
M66310FP
+5V
DIG 16
IC701
OSC1
58
59
R706
SQ. WAVE
DISPLAY BD.
IC702
P1-36
G1-15
5V p-p
FRONT
PANEL
LED’s
POWER SUPPLY (CDP-CX235)
8
1A122 1238
7/7/00
9
,
,
Plug into AC
+5V
T
1
2
CH1 5.00 V=
CH2!5.00 V= MT B10.0ms- 3.16dv ch1+
Reset
10msec/div
After reset, IC701 begins normal operation, producing sequential grid
pulses first. When IC701/pin 60 goes HIGH (+5V), IC701 outputs a positive going pulse at each grid pin, one after the other. Each grid pulse is
applied to a grid cluster consisting of 36 individual plate structures. After
all 16 grids are pulsed (G1 – G16), the sequence repeats. Nothing appears in the display at plug-in because the fluorescent tube has not received plate voltage.
The waveform below shows grid pulses applied to G14, G15, and G16 of
the fluorescent tube.
ch1
ch2
ch3
ch2:dc =-27.3 V, rms = 28.3 V
1
pkpk= 33.8 V, freq= 304 Hz
2
3
T
CH1 20.0 V=
CH2 20.0 V=
CH3!20.0 V= CHP MTB 500us- 2.34dv ch3+
Fluorescent tube Grid pulses at Power OFF
Plate voltage pulses appear only when the CD Changer is powered ON.
At power ON, Syscon (IC501 is not shown) sends data to IC701 so it can
output these pulses. Positive pulses are output the appropriate plate pins
P1-36 to form a number, letter or word when a grid pulse is simultaneously
present.
The following waveforms show a plate signal (Ch 1) compared to the grid
16 signal (Ch 3). This plate segment is lit at the grid assembly 16 location
when both the plate and the grid outputs are HIGH.
ch1
ch3
1
3
T
CH1 20.0 V=
CH3!20.0 V= CHP MTB 500us- 2.34dv ch3+
Fluorescent tube pulses during Power ON
Chan Name Location Voltage
1 P14 IC701/pin 18 30Vp-p
3 G16 IC701/pin 55 30Vp-p
Time base = 500usec
By looking at Channel 1, we see that the plate signal also goes high at
times when grid 16 is not HIGH (Ch 3 = LOW). This means a similar plate
at a different grid is lit at this time.
Chan Name Location Voltage
1 G14 IC701/pin 53 30Vp-p
2 G15 IC701/pin 54 30Vp-p
3 G16 IC701/pin 55 30Vp-p
Time base = 500usec
L901
NOISE
FILTER
CHOKE
Ω
55
THERMAL
FUSE
MAIN BD.
T901
JACK
BD.
C502
1000
2Ω
D505
Ω
2
Ω
2
+
41
R502
D506
30V
3.7VAC
FILAMENT
VOLTAGE
R501
33k
Ω
-28V
-40V
P
Q501
D507
6.2V
IC505
PST994D
C503
100
+
IC504
REG
TA7805
+
D501-
D504
D509
R505
R508
D508
5.1V
+11.5V SOURCE TO: IC506
REGULATOR,
IC503 MOTOR DRIVER
+
+11.5V
C501
3300
-13.5V SOURCE TO: MUTE
TRANSISTORS Q325,Q327,
Q425 AND IC503 MOTOR DRIVER
C507
R506
SYSCON
IC501/30
C506
C505
+
14 2 3
15 1 1
JOG
BD.
13 3 2
115
+
7 9 9
+5V
SOURCE
(B+)
+5V TO MUTE
TRANSISTORS
Q325/E,Q327/E,
Q425/E
FL701 FL INDICATOR TUBE
1
-28V
65
R701
100k
-28V
7
RESET
+5V
+5V
2.5V p-p
OSC.2.48MHz
WORDS
GRIDS 1-15
DATA,
CLK FROM
SYSCON IC501
G16
N
Q701
55
56
VFL
60
FL DRIVER
MSM9202-03GS
VCC
64
OSC0
C702
G
1
P
(36)
LED DRIVER
M66310FP
+5V
DIG 16
IC701
OSC1
58
59
R706
SQ. WAVE
DISPLAY BD.
IC702
P1-36
G1-15
5V p-p
FRONT
PANEL
LED’s
POWER SUPPLY (CDP-CX235)
10
1A122 1238
7/7/00
11
PM3394, FLUKE & PHILIPS
,
Power On
Once the CD Changer is plugged into AC, pressing the front panel Power
button permits Syscon to enable regulator IC506. IC506 outputs D+5V,
+7V, and a reset signal to power the remaining devices on the BD board
and turn on 2 LEDs to illuminate the disc door compartment.
AC Power Only
When the CD changer was plugged into AC, Syscon IC501 received power
at pin 37 and was fully functional as marked by the X501 activity at pins
31 and 32. There is even data and clock signals leaving IC501/pins 18,
19 and 58. These signals go to FL Display Driver IC701, but there is no
instruction to turn on the front panel display while the unit is still OFF.
ch1
ch2
ch3
1
T
2
3
pin 65 to enable regulator IC506. IC506 has three outputs:
1. D+5V from pin 2 is used to:
• Power the digital ICs on the DB board; and
• Turn on the LED at the disc door compartment. This also lets the user
know the unit is ON.
2. +7V from pin 9 is used to:
• Power the focus/sled/tracking driver IC102; and
• Power the coils and motors on the BD board
3. XRST from pin 6 goes HIGH to:
• Unmute the analog audio output lines; and
• Enable Servo Control IC101 and the focus/sled/tracking driver IC102
on the BD board.
Communications IC501 – IC701
At power On, the communications activity increases between IC501 and
IC701. This is to provide constant update information to the display IC701.
ch1
ch2
ch3
1
T
2
Power ON
Syscon IC501 receives the power ON command from the front panel push
button at pin 44 (LOW). IC501 responds by outputting a HIGH at IC SW
CH1 5.00 V=
IC501 Activity at Power OFF
Channel Name CN501/pin
1. FL Data 1
2. FL CLK (Clock) 2
3. FL LT (Latch) 4
Time base = 50usec/div
3
CH1 5.00 V=
IC501 Activity at Power ON
Channel Name CN501/pin
1. FL Data 1
2. FL CLK (Clock) 2
3. FL LT (Latch) 4
Time base = 50usec/div
PUSH
BUTTONS
POWER
DISPLAY BD.
MAIN BD.
R732
CN701/602
+11.5V
+5V
2
JOG BD.
50mVp-p
X501
10MHz
4Vp-p
97
CN601/501
KEY 1
VCC
VCC
32
31
+5V
37 65
IC501
44
SYSCON
CXP84340-075Q
VCC
1
4
8
10
ICSW
IC506 LA5616
REG
EN1
EN2
REG
FL DATA
18
FL CLK
19
58
50
48
49
RESET
FL LT
DATA
CLK
XLT
DOOR
LUMINATION
C508
CN501
1
2
4
18
20
19
CN502
2
6
7
4.8V
9
+
IC701/PIN
63
62
61
5
7
6
IC101/PIN
D+5V
SOURCE
XRST TO
C509
IC101/3,
IC102/15
+5V
C511
+7V
SOURCE TO
DRIVER
IC102 (B BD.)
IC701
FL DRIVER
(DISPLAY BD.)
IC101
DSP
(BD.BD.)
TO
BD.
BOARD
POWER ON
MUTE
(MAIN BD.)
Q325,Q327,
Q425
POWER ON
12
2A122 1242
6 28 2000
Communications IC501 – IC101
PM3394, FLUKE & PHILIPS
Communications from Syscon to Servo Control IC101 does not occur
until the disc is chucked on the spindle motor and ready to play (after the
loading motor finishes chucking the disc). This communications is shown
below:
ch1
13
ch2
ch3
1
2
T
3
CH1 5.00 V=
CH2!5.00 V=
CH3!5.00 V= CHP MTB1.00ms- 3.24dv ch3-
Channel Name CN502/pin
1. Data 18
2. CLK (Clock) 20
3. XLT (Latch) 19
Time base = 1msec/div
IC501 Activity at CD Play
PUSH
BUTTONS
POWER
DISPLAY BD.
MAIN BD.
R732
CN701/602
+11.5V
+5V
2
JOG BD.
50mVp-p
X501
10MHz
4Vp-p
97
CN601/501
KEY 1
VCC
VCC
32
31
+5V
37 65
IC501
44
SYSCON
CXP84340-075Q
VCC
1
4
8
10
ICSW
IC506 LA5616
REG
EN1
EN2
REG
FL DATA
18
FL CLK
19
58
50
48
49
RESET
FL LT
DATA
CLK
XLT
DOOR
LUMINATION
C508
CN501
1
2
4
18
20
19
CN502
2
6
7
4.8V
9
+
IC701/PIN
63
62
61
5
7
6
IC101/PIN
D+5V
SOURCE
XRST TO
C509
IC101/3,
IC102/15
+5V
C511
+7V
SOURCE TO
DRIVER
IC102 (B BD.)
IC701
FL DRIVER
(DISPLAY BD.)
IC101
DSP
(BD.BD.)
TO
BD.
BOARD
POWER ON
MUTE
(MAIN BD.)
Q325,Q327,
Q425
POWER ON
14
2A122 1242
6 28 2000
15
Door Motor Drive
The sliding door in the model CDP-CX235 was an improved feature over
the previous manual trap door that the user pulled down to access the
disc tray table. The sliding door mechanism consists of a motor that
drives a series of gears to slide the door on plastic tracks. The door motor
stops turning when the limit switch is toggled in the closed or open position.
Operation
Syscon IC501 controls the door movement. Only after the CD Changer is
powered ON will IC501 respond to the OPEN/CLOSE Door button at the
Key 2 input (IC501/pin 43).
Pressing the door button causes IC501 to check the position of the door.
S810, a 3-position switch, places one of three voltages at Syscon IC501/
pin 39 to indicate the door position.
Door Position Feedback
Door Position Location Voltage
Closed CN504/pin 1 2.5V
Neutral (in-between) CN504/pin 1 5V
Open CN504/pin 1 0V
A closed door will be driven open and vice versa.
Drive
Syscon IC501 applies an output voltage to pin 23 or pin 24 to drive the
motor. The resultant positive or negative voltage is applied to the door
motor.
Door Motor Drive
Movement IC501/pin 24 IC501/pin 23 IC503/pin 9
Door Opening 4.7V 0V -3.6V
Door Closing 0V 4.8V +3.7V
Feedback
As the door moves, S810 enters the neutral position and 5V is applied to
IC501/pin 39. When the door reaches the end of travel the door toggles
the S810 limit switch to the other end. IC501/pin 39 is lowered to either
2.5 or 0V. IC501 responds by stopping the motor voltage at pin 23 or 24
S621
OPEN/
CLOSE
DOOR
+5V
CN601/501
JOG
BD.
R620
6
4
10
12
+5V
72
IC501
SYSCON
CXP84340
KEY 2
43 39
C620
73
DR
OUT
DR
IN
DOOR
SW.
24
23
R543
R552
R551
R553
8
7
(-VCC)
R554
12
-
+
CXA1291P 1/3
13 14
-13.5V
+11.5V
(VCC)
IC503
R555
1.2
9
Ω
DR-SW.
C551
R557
OUT 3
C552
R556
1.2
D OUT
R558
D IN
Ω
GND
CN504/811
CN812/810
3
4
2
1
1 2
DOOR
MOTOR BD.
M
M810
+5V
DOOR MOTOR DRIVE
16
R807
DOOR
SW BD.
OPEN
NEUTRAL
CLOSE
S810
3A122 1243
6 28 2000
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