Sanyo FISHER DVD-1500 AU User manual

Service Manual FILE NO.
R
CONTENTS
DVD Player DVD-1500
DVD-S1500
PRODUCT CODE No.
137 093 05 (AU)
137 093 04 (US)
REFERENCE No. SM5810142
MIN MAX
PHONE LEVELPHONES
PLAY
PAUSE/STEP STOP
fe
k
an
q
OPEN/CLOSE
z/ON
STANDBY
z/ON
PICTURE
MODE LAST MEMO OPEN/CLOSE
q
ON SCREEN SUBTITLE AUDIO
SET UP RETURN
REV FWD
REV SLOW PAUSE/STEP STOP FWD SLOW
PREV PLAY NEXT
dc
kn
fae
CLEAR
MENU
TITLE ZOOM
123C
456
7890
PROGRAM SEARCH MODE ANGLE ANGLE REPLAY
BOOKMARK REPEAT A-B REPEAT
4
5
ENT ba
SPECIFICATIONS ..................................................1
LASER BEAM SAFETY PRECAUTION..................1
MECHANISM REPLACEMENT ..............................1
MECHANISM OPERATION....................................3
DVD P.W.BOARD OPERATION.............................4
CHECK FLOW AND TROUBLE SHOOTING .......9
TROUBLE SHOOTING (CHECK WAVEFORM)...16
TROUBLE SHOOTING (CHECK WAVEFORM)...33
TROUBLE SHOOTING (SCHEMATIC DIAGRAM
FOR WAVEFORM CHECK)................................34
TROUBLE SHOOTING (SCHEMATIC DIAGRAM
FOR VOLTAGE CHECK)....................................46
MPEG P.W.BOARD OPERATION..........................48
CHECK WAVEFORM ...........................................55
SCHEMATIC DIAGRAM
FOR WAVEFORM CHECK................................58
EXPLODED VIEW (CABINET & CHASSIS) ..........60
EXPLODED VIEW (DVD MECHANISM) ...............61
PARTS LIST............................................................62
IC BLOCK DIAGRAM & DESCRIPTION.................70
WIRING CONNECTION.........................................79
SCHEMATIC DIAGRAM (DVD) ............................80
SCHEMATIC DIAGRAM (MPEG for AU) ..............84
SCHEMATIC DIAGRAM (MPEG for US) ..............88
SCHEMATIC DIAGRAM (FRONT for AU) ............92
SCHEMATIC DIAGRAM (FRONT for US) ............94
WIRING DIAGRAM (DVD A SIDE) .......................82
WIRING DIAGRAM (DVD B SIDE) .......................83
WIRING DIAGRAM (MPEG A SIDE for AU) .........86
WIRING DIAGRAM (MPEG B SIDE for AU) .........87
WIRING DIAGRAM (MPEG A SIDE for US) .........90
WIRING DIAGRAM (MPEG B SIDE for Us)..........91
WIRING DIAGRAM (FRONT,PHONE SOCKET,
POWER SWITCH,TRAY LED,
TRAY OPEN/CLOSE MOTOR,
TRAY OPEN/CLOSE SWITCH)............................96
WIRING DIAGRAM (AMP).....................................97
VOLTAGE TABLE...................................................98
(AU)
(US)

- 1 -
1.Cautionary instructions in handling the assy
(Safety instructions)
Optical pickup
The laser beam used in the pickup is classified as "class 2". Exposing
your eyes or skin to the beam is harmful. Take care not to do so.
(Caution against static electricity and leakage voltage)
Ground securely the work tables, tools, fixtures, soldering irons
(including those made of ceramic) and measuring instruments used
in the production lines and inspection departments that handle
loaders. The workers shall also be grounded.
(Cautionary instructions in handling)
Do not touch the object lens when handling a loader, or the lens will
be stained, resulting in inadequate playability.
There is no power supply protection circuit provided for this product
or adjustment/inspection device. Short-circuiting may lead to fire or
damage.
Take care so as to protect from exposure to water, the entry of
metallic pieces or dew condensation.
In particular, a strong magnet adjacent to the pickup will not only
get inoperative but can damage the pickup if a small metallic piece,
such as a screw or swarm, enters.
The loader edge can cause injury if inadvertently handled.
Do not touch a rotating disk, or injury may result.
This product is a precision device. Handle carefully.
A shock or dropping will cause misalignment or destruction. If it
should occur, refer to clause 2.
This product is so designed as to endure an initial shock equivalent
to a drop from a height of approx. 90 cm under the packed condition.
After the initial shock, the resistivity will still remain at a level of 50
to 60 G, but the mechanical robustness will weaken.
Do not place in a dusty location.
LASER BEAM SAFETY PRECAUTION
MECHANISM REPLACEMENT The entry and deposition of dirt into or on the pickup lens or moving
section will cause malfunction or degradation.
(Connectors)
Do not connect or disconnect while power is on.
Connecting or disconnecting signal wires or the main power cord
when the power is on may destruct the unit or fixture.
When connecting, push all the way in securely.
An insufficient insertion may cause a bad contact, leading to an
erroneous operation.
Do not connect or disconnect roughly by an excessively strong force,
or a broken wire or bad contact may result.
Semiconductors are connected. Do not touch connector terminals
directly.
If the worker is grounded, there is nothing to worry about static
electricity, but the rust on the connector terminal surface caused by
the touch may result in bad contact.
(Power source)
The power source need be good in quality (free from instantaneous
interruptions or noises).
A low quality power source may well cause malfunction.
(Storage)
Do not place or store in a dusty place or a place where dew
condensation is possible.
The entry and deposition of dirt or dust into or on the pickup lens or
moving section will cause malfunction or degradation.
Also, dew condensation causes rust;the rust penetrate into the
precision part of a pickup, causing malfunction, or degrading the
optical quality of the internal lens and reflector, which also leads to
malfunction.
SPECIFICATIONS
Type ........................................ DVD player
Signal format ........................... NTSC or PAL color
Laser ....................................... Semiconductor laser,
wavelength 650nm
1 mW(DVD) , 0.5mW(CD)
Frequency range..................... 4 Hz to 44 kHz(DVD fs : 96kHz)
(digital audio)
Signal to noise ratio ................ More than 105 dB
Harmonic distortion ................. 0.003 %
(digital audio)
Wow and flutter ....................... Below measurable level
DIGITAL OUTPUT
COMPONENT VIDEO OUT
Y.............................................1.0V
C , C .....................................0.7V
S-VIDEO OUT
Y.............................................1.0V
C.............................................0.286V
VIDEO OUT .................................1.0V
AUDIO OUT .................................1.2V rms
Power requirements.....................AC 110 - 240V , 50/60Hz
Power consumption .....................16 Watts
Dimensions (W x H x D)...............Approx. 360 x 87 x 282 mm
Weight ..........................................Approx. 2.8kg
Specifications subject to change without notice.
p-p (75 ohm)
p-p (75 ohm)
p-p (75 ohm)
p-p (75 ohm)
p-p (75 ohm)
B R
S-VIDEO OUT
DIGITAL
OUT
RL
OPT. VIDEO OUT AUDIO OUT
COMPONENT VIDEO OUT
YC
B C R
TV SYSTEM
PAL NTSC
CAUTION – INVISIBLE LASER RADIATION WHEN OPEN AND
INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.
ADVARSEL – USYNLIG LASER STRÅLING VED ÅBNING, NÅR
SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION, UNDGÅ UDS ÆTTELSE
FOR STRÅLING.
VARNING – OSYNLIG LASER STRÅLNING NÄR DENNA DEL ÄR ÖPPNAD
OCH SPÄRR ÄR URKOPPLAD. STRÅLEN ÄR FARLIG.
VORSICHT – UNSICHTBARE LASERSTRAHLUNG TRITT AUS, WENN
DECKEL GEÖFFNET UND WENN SICHERHEITSVERRIEGELUNG
ÜBERBRÜCKT IST. NICHT, DEM STRAHL AUSSETZEN.
VARO – AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTIINA
NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.
(AU)

- 2 -
MECHANISM REPLACEMENT
FLOIL OIL
G-474B
FLOIL OIL
G-2000B
FLOIL OIL
G-2000B
Don't disassemble part ①because of difficulty of
adjustment.
MOLYKOTE
EM-50L
MOLYKOTE
EM-50L
MOLYKOTE
EM-50L
MOLYKOTE
EM-50L
SILICON GREASE
KS-64
4. TRAY PART
MOLYKOTE
EM-50L
GREASE
CDF-409
GREA
S
CDF-4
0
5. BASE MECHANISM PART
Slide the switch as an arrow mark
when removing pick up.
1. PICK UP P.W.B PART
2. TRAY AND BASE MECHANISM PART
3. Base mechanism mounting PART
1

- 3 -
MECHANISM OPERATION
SHASSIS
FRONT SIDE
MOTOR
MARKER
MARKER
2
1
2
3
3
1.How to setting the tray.
1. The GEAR 1move from side to side.
2. Match the mark of GEAR 2and mark of GEAR 3,
and then install the BOSS.
3. Turn the GEAR 1counterclockwise, and then SLIDE
move right side.
RIB
RIB GREASE
EM-50L
GREASE
EM-50L
GREASE
EM-50L
LARGE TOOTH
GEAR HO
CHASSIS HOLE 5
4
LOARDING
GEAR
MARKER
MARKER
TRAY
HOLE
6
7
8
9
4. Move the SLIDE left side.
5. Match the Hole of GEAR 5and Hole of CHASSIS 4.
6. Match the hole of GEAR 7and hole of chassis while turning
GEAR 6.
7. Match the mark of LOADING GEAR 8and gear of TRAY
where see horn hole 9of tray.
8.Push a tray with the state that turned the entire surface of a
tray into approximately 5 degrees the lower part slowly.

- 4 -
General operation diagram
PCK UP
SPINDLE
MOTOR
SLED
MOTOR
LOADING
MOTOR
Mechanism SW (OPEN, CLOSE, The internal circumferenceLIMIT)
MLD1, 2
SLD1, 2
F0±, TR±
LCD1, LCD2
LD, MD, VR, HFM
A, B, C, D, E, F
VCC, VC, GND
ACT.
I / V
LD
RFAMP
SpindleDRV.
4ch DRV.
IC501
TA1254AF
IC602
BA6849
IC601
BA5931
5V
VR 2VR
2.1V 4.2V
9V
9V
AMP
AMP
FOO, TRO, FMO
DVR
2.1 / 1.65
LD1, LD2
EQB, EQF (Equalizer Ajust.)
TE, RPO, RPZ, LVL
RF (CD)
DMO_CD IC701
TC9461F
16.9 MHz
5V
5V
IC801
TC90A41F
27 MHz
3.3V
Servo, DSP
CDdecoder
DVDdecoder
RF (DVD)
DVR
PWM Out
DVO
_
DVD
MICOM FLASH
MEMORY
VCD
16.9 MHz
384 Fs
HRST
from BACK END
from BACK END
FE
SCD, SCL, SCB, ＊FRST,
CD/＊DVD, DPCTL, LCSW
DVD/＊CD, ＊FRST,
SPDL-FG
IC802
TC6815
＊CS3, (＊CS2), ＊SWR,
＊INTDEC,＊RD, ＊FRST,
(＊RDY), (BCLK),
D0 - D1, A0 - A1
FLGA, FLGB, FLGC, FLGD, ＊CCE,
BUCK, BUS0, BUS1, BUS2, BUS3,
＊FRST(＊RST), SLD-LK, SBOK,
SBSY, SLD-LOCK
＊ROM, ＊RD
D0 - D7, A0 - A11
DVD P.W.BOARD OPERATION
This is a basic explanation.

- 5 -
FOCUS DRV.
IC601 25pin
FE
TP513
TE
TP512
SLED
IC601 20pin
VRA
①⑤
③
②
④
⑥
The orientation that optical lens
DiskDistinction
FServoCLV ON
pick return play (If there is pick in perimeter of a circle,
there is it, and time of bottom gets longer)
TServo ON
(Actuating description)
1. After turning on the power or inserting a disk, this DVD Assy starts to perform a disk identification operation.
1) Sets the circuit to the DVD mode, returns the pickup, lowers the lens an lights the LASER lamp.
The pickup return, lens operation and LASER lamp illumination are visuall recognizable.(spindle kick)
2) In PU mode (CD), raises the lens.
Focus level measurement (A), judges the FE pulse whether to be 1 or 2.
3) In PU mode (DVD), lowers the lens.
Focus level measurement (B).
4) Judgment pulse 2 : DVD two-layer disk,
(B)/(A)>1.5 : DVD one-layer disc.
Other than the above condition : CD
5) Sets the circuit to the PU mode (based on the above disk judgment, the circuit is set to the PU mode)
6) Servo attracting operation (servo turns on):CLV turns on in the same way as a CD player.
CD
DVD
one-layer
disk
DVD
two-layer
disk
Two Focus err.
DVD P.W.BOARD OPERATION
level difference
Disc distinction
Disc distinction
Disc distinction
Disc distinction
Disc distinction
Zoom
Disc distinction
Focus point
Don’t Servo on
Servo on
Focus error signal（lens distant→near
）
Image

- 6 -
FOCUS DRV.
IC601 25pin
FE
TP513
TE
TP512
SLED
IC601 20pin
VRA
DiskDistinction
ServoAdjust.

Inner FromExter Frominner
Datarea
d
ServoAdjust.
Exter
INITAttention
Fsearch
2. Automatic servo alignment
Contents of the servo alignment and the alignment method
1) Tracking balance
2) Focus balance
3) Focus gain
4) Tracking gain
5) RF gain
Set by the command the micon, reading the correction value of the TC9461, gives to the TA1254.
6) RF equalizer (DVD only)
The micon, monitoring the error rate (TC90A41), sets a PWM data (TC90A41) and provides a voltage for the TA1254.
Performed automatically by the TC9461 based on the command
given by the micon (microcomputer)
to PU Equalizevoltage
to PU
MiconI/F
DVD : PLCK (27MHz)
CD : BCK (1.4MHz)
DVD : TC90A41F
CD : TC9461F
TC9461F
TC90A41F MiconSetting
12345678910111213141516
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
VCKF
VccP
LVL
TEO
FEO
DFTN
VssS
RPZ
RPO
RPB
RPP
RFO
NC
NC
VccR
DPDB
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
P2FN
P2FP
GNDS
P2DI
P2CI
P2BI
P2AI
LDP2
GNDR
P1AI
P1BI
P1CI
P1DI
LDP1
P1FP
P1FN
TEB FEB PSC Vcc2 NC EQD GND2 RFDC RFA EQB EQF MDI1 LDO1 P1TN P1TP NC
VRCK
SCD
SCL
SCB
DPD2 DPD1
DPBD
DPAC
Vdd
VrD
VrA
MDI2
LDO2
P2TN
P2TP
GND
F-gain
Adjustment
F-gain
Adjustment
T-gain
Adjustment
R-gain
Adjustment
TE-gain
Adjustment
FTE-gain
Adjustment
Level
Detection
BUS Time
Constant
Adjustment
APC2
APC1
3BTE
Generation
DPDTE
Generation
FE
Generation
RF Ripple
Generation
EQ
sel-DPD
sel-LVL
sel-FE
sel-PD
sel-RF
sel-TE
mode-IC
mode-TE
DVD P.W.BOARD OPERATION
An automatic alignment method (e.g.
automatic alignment sequence) varies with
the version of the micon. In any case, it is
important to recognize that the above-
mentioned alignments are conducted
regardless of the version.
Amp mode setting
focus gain: F-gain, FE-gain
tracking gain : T-gain, TE-gain
RF gain : R-gain
TE : mode-TE (DPD or 3beam)

- 7 -
3. Data reading
(1) The SLED control is performed by the control output "FMO" (TC9461, pin 48), which reaches the IC601 via the
IC605 and drives the SLED motor.
(2)The SPINDLE control is performed by the control output "DMO CD" (TC9461) in the case of a CD, and "DMO DVD" (TC90A41AF)
in the case of a DVD, which reaches the IC602 via the IC605, whose reference voltage is set by the DVD/CD* of the micon,
and drives the SPINDLE motor (brushless motor).
The reference voltage is 1.65 V for a DVD, and 2.1 V for a CD.
(3) The PLL control is conducted by the TC9461 for a CD, and by the TC90A41AF for a DVD.
(4) An output is in accordance with the respective disks.
CD :TC9461 serial data (BCK, CDDATA, LRCK, C2PO) output (CN802)
DVD:TC9461 serial data (BCK, CDDATA, LRCK, C2PO) and this are inputted into the ROM decoder (IC802), converted to the
MPEG decoder signals (parallel data) and then outputted (CN801).
DVD:TC90A41AF MPEG data:parallel signals (SD0-7, SERR, SBGN, SENB, SDCK and SREQ) are inputted into the ROM
decoder (IC802), decode the digital copy protection and are converted to the MPEG decoder signals (parallel data)
and then outputted (CN801).
DVD P.W.BOARD OPERATION

- 8 -
Depress open/close
switch.
Place a disk
on tray.
Tray close/closed
Tray opens.
"LASER" lights.
Lowers lens
(approx. 400 ms).
Pickup returns.
INIT processing of
TC9461
Laser off 20 ms
Lowers lens
Rotates SPINDLE at
a speed of twice
that of CD.
Waits for prescribed
number of rotations
to be completed.
Checks FG.
STOP
YES NO
DVD
CD
(b)/(a)>1.5
FE pulses;
one or two
One-layer DVD
Sets one-layer
DVD circuit
to pickup mode.
Sets two-layer
DVD circuit to
pickup mode
Sets CD circuit
to pickup mode.
YES
NO
2
1
DVD/CD
DVD
CD
Measures error rate
Error judgement
OK
NG
OK
OK
OK
OK
NG
NG
NG
NG
CD
CD/DVD
Optimization
CDDVD
Turn on power.
Depress open/close
switch.
Two-layer DVD
Laser on. DVD/CD
Aligns tracking balance
Error judgement
EQB
Error judgement
EQF
Error judgement
Error judgement
Aligns tracking balance
TIME OUT:ERR.
Raises lens.
FOCUS OK?
SPINDLE motor
turns on.
8/12 cm
identification.
FG confirmation
Rotates at a speed of
approx.0.7 time
that of CD
Waits for approx.500 ms.
New disk?
Layer jump
Old
New
Tracking balance alignment
Rotates at a speed of twice that of CD.
Waits for 100 ms.
Lowers lens with
each IC in DVD mode
Measures FE level (a)
FE pulse 1 or 2
Lowers lens with in
LCD and DVD mode
Rotates at
a speed of two times
that of CD
Measures FE level (a)
TRACKING ON
SLED OFF
Sets to normal speed.
ADDRESS CHECK
200ms wait
Focus balance alignment
Focus gain alignment
Tracking gain alignment
SLED ON
RF gain alignment
100ms wait
One-layer or
two-layer
Two-layer
completed
One-layer
Two-layer completed
Measures p oor playability varlue
READ-IN play
CD :TOC READ
DVD : CSS processing
Pickup moves outward.
Optimization Wait to PLAYBACK
DVD P.W.BOARD OPERATION
(GENERAL FLOW) This is a basic flowchart.

- 9 -
CHECK FLOW AND TROUBLE SHOOTING
(Power on)
Power on
Problem/symptom Check Waveform Schematic diagram Reference data
CN803 (PH5P)
1 Cannot be energised Check for a voltage of 5 V/9 V.
Check for the HRST. (17)(19) K
Turn off power at once. Check SPINDLE/SLED servo system. BA6849 voltage table (4)
2 SPINDLE motor runs away. Check for FLOW signal. (44)(45) A , B
Check and trace control signals. (46) A , B
Turn off power at once. Check SPINDLE/SLED servo system.
3 SLED motor runs away. Check for FLOW signal. I BA5931 voltage table (5)
Check and trace control signals. (47)(48)
(Tray open / close)
Tray open/close
Problem/symptom Check Waveform Schematic diagram Reference data
Check for motor drive input/output. (1) J BA5931 voltage table (6)
1 Neither opens nor closes Check mechanical switch & its output. (16) J
Check for HRST & FRST. (18)(19) J
2 Opens but immediately closes. Check for motor drive input/output. (1) J BA5931 voltage table (6)
Check mechanical switch & its output. (16) J
3 Opens but motor does not stop.Check for motor drive input/output. (1) J BA5931 voltage table (6)
Check mechanical switch & its output. (16) J
4 Loading speed abnormal Check for motor drive input/output. (1) J BA5931 voltage table (3)
An extract from "GENERAL FLOW" An extract from "GENERAL FLOW"
Turn on power.
Tray close/closed
"LASER" lights.
Pickup returns.
8/12 cm identification
Identifies disk
Sets mode
INIT processing of TC9461
Laser off 20 ms
Laser on.
Focus search
Automatic alignment
Tracking balance
Focus balance
Focus gain
Tracking gain
RF gain
Check for connector
and power source.
Turn on power.
Tray close/closed
"LASER" lights.
Pickup returns.
8/12 cm identification
Identifies disk
Sets mode
NIT processing of TC9461
Laser off 20 ms
Laser on.
Focus search
Depress open/close
switch.
Tray opens.
Place a disk
on tray.
Depress open/close
switch.
Tray open/close

- 10 -
LASER ON/ 8/12 cm identification
Problem/symptom Check Waveform Schematic diagram Reference data
Check LASER ON timing and drive transistor voltage. (18)(19)
Check VCC2 at pin 36 of IC501 TA1254. L
Check for short-circuiting of LASER (excessive current [R5100],
though protected by fixture)
1 "LASER" does not light. Check for LASER destruction. If so, check LASER current (R5100).
Check micon interface (SCB, SCL & SCD) TA1254 voltage
Check FRST (LASER to be active at LOW). table (2)
Check signal FLOW. (28) ~ (31) L
Check and trace control signals. L
2 No pickup return operation. Check SLED voltage and timing. Check limit switch. (35) ~ (37) I,I'
3 Disk does not rotate. Check SPINDLE voltage and timing. (44) ~ (46) A , B Voltage table (4)
Check SPINDLE voltage and timing. (44) ~ (46) A ,B Voltage table (4)
4 Disk rotates at a high speed. Check SPDL FO.
Turn off power at once.
Check SPINDLE/SLED servo system.
(LASER ON/ 8/12 cm identification)
Laser focus search after initial processing.
Problem/symptom Check Waveform Schematic diagram Reference data
1 Disk error due to erroneous Check disk identifying waveform in LASER mode. 2,(34) ~ (38) F
disk identification (28) ~ (31) L
2 Focus servo inactive Check waveforms up to

focus ok" with each disk. (34)(35)(37)(38) F
Check pin 43 of IC701 TC9461. 2,(36)
Check DFTN. (40) ~ (43)
DFTN:normally High, at SCRATCH:Low C,D,E
Data output normal? CN801/IC802 C,D,E
3 Disk unreadable Check DVD/*CD signal (CD/*DVD). Voltage table
DVD:High, CD:Low (44) ~ (46) (8)
(IC900 pin 1, IC501 pin 35, Q6001 base)
Check SEL signal (must be High when laser is on). (28) ~ (31) L
(Laser focus search after initial processing.)
CHECK FLOW AND TROUBLE SHOOTING
An extract from "GENERAL FLOW" An extract from "GENERAL FLOW"
Turn on power.
Tray close/closed
"LASER" lights.
Pickup returns.
8/12 cm identification
Identifies disk
Sets mode
INIT processing of TC9461
Laser off 20 ms
Laser on.
Focus search
"LASER" lights.
Lowers lens
(approx. 400 ms).
Pickup returns.
SPINDLE motor turns on.
8/12 cm identification.
FG confirmation
Rotates at a speed of
approx.0.7 time that of CD
Turn on power.
Tray close/closed
"LASER" lights.
Pickup returns.
8/12 cm identification
Identifies disk
Sets mode
INIT processing of TC9461
Laser off 20 ms
Automatic alignment
Tracking balance
Focus balance
Focus gain
Tracking gain
RF gain
DVD / CD CD
Turns on laser.
Lowers lens.
Rotates SPINDLE at
a speed of twice
that of CD.
Waits for prescribed
number of rotations to
be completed.
Checks FG.
Raises lens.
NO
FOCUS OK?
YES
Waits for approx.500 ms.
Laser on.
Focus search

- 11 -
Disk identification/mode setting
Problem/symptom Check Waveform Schematic diagram Reference data
Check that disk identification is correct. 2 F
Not focusable Check that FOO waveform is normal or smooth.
1 (disk error) Error 21 Check that peak value of detection pulse (S curve) is correct. (34) ~ (38)
Check that lens up/down operation is normal.
Check that lens is free from dirt or stain.
2 Not focusable Check LASER current (R5100). F
(disk error) Error 21 Compare it with that indicated close to pickup's serial number.
3 No focus search FLGC TP716 (IC900 80pin) F
4 No focus search Check RFO (IC501 pin 28). (2) ~ (4) F
Wrong ROM
5 Inactive Check LCSW Voltage tables
Repair CD/*DVD (DVD/*CD). (7) & (8)
(Disk identification/mode setting)
CHECK FLOW AND TROUBLE SHOOTING
An extract from "GENERAL FLOW"
Turn on power.
Tray close/closed
"LASER" lights.
Pickup returns.
8/12 cm identification
Identifies disk
Sets mode
INIT processing of TC9461
Laser off 20 ms
Laser on.
Focus search
Automatic alignment
Tracking balance
Focus balance
Focus gain
Tracking gain
RF gain
Raises lens with each IC
in CD mode
Measures FE level (a)
Measures number of FE pulses;
one or two
Lowers lens with each IC
in DVD mode
Rotates at a speed of two times that of CD
Measures FE level (b)
FE pulse 1 or 2 2
1
Two-layer DVD
(b) / (a) > 1.5 NO
YES
one-layer DVD
Sets one-layer DVD circuit to
pickup mode. Sets CD circuit to pickup mode. Sets two-layer DVD circuit to pickup mode

- 12 -
Automatic alignment block
Problem/symptom Check Waveform Schematic diagra
m
Reference data
Focus unstable focus servo system. (24)~(27) F
1 Susceptable to shock Check for signal flow
Oscillatory noise from pickup Check for signal flow
Squeaky noise while pickup is travelling If not rotating with board, pickup need be analyzed.
Excessively long time taken for alignment tracking servo system. (20)~(23) G, H
2 Susceptable to shock Check for signal flow
Oscillatory noise from pickup Check for signal flow
Squeaky noise while pickup is travelling If not rotating with board,pickup need be analyzed.
Check RF level. (2)(3)(4) C, D, E
3 Unable to align/disk error Laser deteriorated? (Check laser current:R5100)
Check for dirt on lens
4 Long time taken for alignment Check FWD. I Voltage table (2)
(Automatic alignment block)
CHECK FLOW AND TROUBLE SHOOTING
An extract from "GENERAL FLOW"
Identifies disk
Sets mode
INIT processing of TC9461
Laser off 20 ms
Turns on laser.
Focus search
Automatic alignment
Tracking balance
Focus balance
Focus gain
Tracking gain
RF gain
DVD / CD
DVD
Internal circumference
optimization
One-layer or
two-layer
Two-layer
completed
One-layer
Layer jump
Two-layer
Tracking balance alignment
Rotates at a speed of twice that of CD.
100ms wait
DVD / CD CD
DVD Sets to normal speed.
TRACKING ON
SLED OFF 100ms wait
200ms wait
ADRESS CHECK
Focus balance alignment
Focus gain alignment
Tracking gain alignment
SLED ON
RF gain alignment

- 13 -
(DVD internal circumference EQ optimization alignment)
DVD internal circumference EQ optimization alignment
Problem/symptom Check Waveform Schematic diagram Reference data
Check for propriety of RF EQ alignment. 3, (35)(38) C Voltage table
1 DVD disk unplayable Warp, small 3T, affected by double refraction? (1)
Defect, eccentricity, surface shaking?
2 DVD disk unplayable Check RF waveform. Compare with good unit. C
(2)(3)(4)
CHECK FLOW AND TROUBLE SHOOTING An extract from "GENERAL FLOW"
Turn on laser.
Focus search
Automatic alignment
Tracking balance
Focus balance
Focus gain
Tracking gain
RF gain
DVD / CD CD
DVD
Internal circumference
optimization
One-layer
or two-layer
Two-layer
completed
One-layer Two-layer completed
Layer jump
CD :TOC READ
DVD: CSS processing
Pickup moves outward.
DVD / CD
External
circumference
optimization
STOP
Two-layer
DVD CD
PLAYBACK
DVD / CD CD
DVD
Measures error rate
Error judgement
Aligns tracking balance
ERR.判定
Error judgement
Error judgement
Error judgement
EQB
EQF
Aligns tracking balance
TIME OUT : ERR.
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
Optimization
One-layer
or two-layer Two-layer
completed
One-layer Two-layer completed
Layer jump
Two-layer
CD

- 14 -
Automatic alignment
Tracking balance
Focus balance
Focus gain
Tracking gain
RF gain
DVD / CD CD
DVD
Internal
circumference
optimization
One-layer or
two-layer
Two-layer
completed
One-layer
Two-layer
completed
Layer jump
CD : TOC READ
DVD : CSS processing
Pickup moves outward. DVD / CD
External
circumference
optimization
STOP
Two-layer
DVD CD
PLAYBACK
Measures error rate
Error judgement
Aligns tracking balance.
E
rror judgement
Error judgement
EQB
EQF
OK
NG
OK
NG
OK
NG
Optimization
One-layer or
two-layer
Two-layer
completed
Layer jump
NG
Time out
NG
OK
OK
(DVD external circumference EQ optimisation alignment)
DVD external circumference EQ optimization alignment
Problem/symptom Check Waveform Schematic diagram Reference data
Check for propriety of RF EQ alignment. 3, (35)(38) C
1 Two-layer DVD disk unplayable warp, small 3T, affected by double refraction?
defect, eccentricity, surface shaking?
2 " Check RF waveform. Compare with good unit.
(2)(3)(4) C
3 " Jumps correctly to 2nd layer? (49)(50) F
4 Error 22 occurs. Check TE waveform. (36)~(38)
CHECK FLOW AND TROUBLE SHOOTING An extract from "GENERAL FLOW"

- 15 -
Turns on laser.
FOCUS SEARCH
Automatic alignment
Tracking balance
Focus balance
Focus gain
Tracking gain
RF gain
DVD / CD CD
DVD
Internal
circumference
optimization
One-layer or
two-layer
Two-layer
completed
One-layer Two-layer completed
Layer jump
CD :TOC READ
Pickup moves outward. DVD / CD STOP
Two-layer
DVD CD
DVD : CSS processing
CD PLAYBACK
(Playing CD)
Playing CD
Problem/symptom Check Waveform Schematic diagram Reference data
1 Unplayable (no sound, no picture) Is output signal around? (5)~(10) D,E
2 Sound skipped Check waveform. (11)~(15),(33) D,E
3 No or intermittent sound Is spindle motor waveform normal? 1,(5)~(10) D,E
4 No sound Check DATA. (4)~(6) D,E
Poor playability Check RF waveform (any difference from that of good unit) (2)~(4) D,E
Surface shaking, warp Realignment of mechanism (11)~(15)
Scratch Check DFTN (40)~(43) D,E,H TA1254
5 DFTN:normally High, When scratched:Low
Finger print Check DFTN (40)~(43) D,E,H TA1254
DFTN:normally High, When scratched:Low (11)~(15)
Eccentricity Check tracking servo. (33) D,E,H
Is PAUSE stable?
6 Frequency response characteristics abnormal Check EMPHA. Voltage table (11)
CHECK FLOW AND TROUBLE SHOOTING
An extract from "GENERAL FLOW"

- 16 -
MLD1
MLD2
MLD2
LD2
LD1
GND
OPEN中 CLOSE中
P1CI
MLD2
P1DI
P1BI
VRA
P1AI
RFA
RFO
RFI
P1CI
MLD2
P1DI
P1BI
VRA
P1AI
RFA
VRA
RFO
RFI
(1) (2)
(3) (4)
ZoomZoom
The dark waveforms are of reference nature.
Please note their overall level and noises.
TROUBLE SHOOTING (CHECK WAVEFORM)
BCK
MLD2
CDDATA
LRCK
GND
C2PO
(5) Normal play (1track) (6) 0dB play
Pay attention here.
-Respond to numbering of each list of "CHECK FLOW AND TROUBLE SHOOTING"

- 17 -
(7) L-ch 0dB (8track) (8) R-ch 0dB (10track)
BCK
MLD2
CDDATA
LRCK
GND
C2PO
(9) STOP (200us/div) (10) STOP (5us/div)
BCK
MLD2
CDDATA
LRCK
GND
C2PO
TROUBLE SHOOTING (CHECK WAVEFORM)
(11) TCD-721 SCRATCH 1.2mm
TE
MLD2
RFO
FE
VRA
C2PO
-Respond to numbering of each list of "CHECK FLOW AND TROUBLE SHOOTING"

- 18 -
(12) TCD-721 SCRATCH 2.0mm (Reference) (13)
TE
MLD2
RFO
FE
VRA
C2PO
(14) 444A FINGER PRINT 19track (15) 444A INTERRUPTION 10track
TE
MLD2
RFO
FE
VRA
C2PO
Shows how the C2PO rises. The C2PO
rises invariably with large scratches, while
no or few C2PO appear with small or few
scratches.
TROUBLE SHOOTING (CHECK WAVEFORM)
(16) OPEN/CLOSE input/output TIMING (17) POWER on reset TIMING
MLD2
MLD2
MLD1
OPEN-SW
CLOSE-SW
MLD2
5V-D
HRST
TP800
HRST
CN802
PIN4
-Respond to numbering of each list of "CHECK FLOW AND TROUBLE SHOOTING"

- 19 -
(18) OPEN -> CLOSE (STOP state) (19) Power OFF -> ON
＊FRST
MLD2
LD-1
CLOSE-SW
HRST

open sw on
tray closed
LASER on
＊FRST
MLD2
LD-1
HRST

LASER on
(20) PLAY state (21) PAUSE state
MLD2
TP506
E
PICK output
TE
TP512
TRO
After LRF
TROUBLE SHOOTING (CHECK WAVEFORM)
(22) PLAY state (23) PAUSE state
TE
TP512
IC601
1pinTR-
IC604
7pin
IC601
3pin
-Respond to numbering of each list of "CHECK FLOW AND TROUBLE SHOOTING"