Yamaha CDC-775 User manual

CDC-775
CDC-775
100669
SERVICEMANUAL
COMPACT DISC PLAYER
■ CONTENTS
TO SERVICE PERSONNEL .....................................1~2
REAR PANELS .............................................................3
SPECIFICATIONS .........................................................4
INTERNAL VIEW .......................................................... 4
DISASSEMBLY PROCEDURES ..............................5~6
STANDARD OPERATION CHART ..........................7~8
TEST MODE ............................................................9~11
ADJUSTMENT.............................................................12
ERROR MESSAGES ............................................13~15
IC DATA ................................................................16~20
DISPLAY DATA ..........................................................21
IC BLOCKS ...........................................................22~23
PIN CONNECTION DIAGRAM ...................................23
BLOCK DIAGRAM ................................................24~25
PRINTED CIRCUIT BOARD .................................26~31
SCHEMATIC DIAGRAM .............................................32
PARTS LIST ..........................................................33~42
GREASE APPLICATION DIAGRAM.......................... 43
REMOTE CONTROL TRANSMITTER........................44
This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.
It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are
already known and understood by the users, and have therefore not been restated.
WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in
personal injury, destruction of expensive components, and failure of the product to perform as specified.
For these reasons, we advise all YAMAHA product owners that any service required should be performed
by an authorized YAMAHA Retailer or the appointed service representative.
IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute authorization,
certification or recognition of any applicable technical capabilities, or establish a principle-agent
relationship of any form.
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering,
and service departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore,
inevitable and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to
exist, please contact the distributor's Service Division.
WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have
accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this
buss).
IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to
the unit.
IMPORTANT NOTICE
CDC-775
このサービスマニュアルは、エコマーク認定の再生紙を使用しています
。
ThisServiceManualusesrecycledpaper.

SERVICEMANUAL
Copyright 2002 YAMAHA CORPORATION
This manual is copyrighted by YAMAHA and may not be copied or 
redistributed either in print or electronically without permission.

CDC-775
CDC-775
1. Critical Components Information.
Components having special characteristics are marked and
must be replaced with parts having specifications equal to
those originally installed.
2. Leakage Current Measurement (For 120V Models Only).
When service has been completed, it is imperative to verify
that all exposed conductive surfaces are properly insulated
from supply circuits.
●Meter impedance should be equivalent to 1500 ohm shunted
by 0.15µF.
●Leakage current must not exceed 0.5mA.
●Be sure to test for leakage with the AC plug in both
polarities.
EQUIPMENT
UNDER TEST
WALL
OUTLET
INSULATING
TABLE
AC LEAKAGE
TESTER OR
EQUIVALENT
<
CAUTION: USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE
SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
THE COMPACT DISC PLAYER SHOULD NOT BE ADJUSTED OR REPAIRED BY ANYONE EXCEPT PROPERLY
QUALIFIED SERVICE PERSONNEL.
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING
This set employs a laser. Therefore, be sure to carefully
follow the instructions below when servicing .
1. Laser Diode Properties
●Material : GaAlAs
●Wavelength : 780 nm
●Emission Duration : Continuous
●Laser Output : max. 44.6 µW*
* This output is the value measured at a distance
of about 200 mm from the objective lens
surface on the Optical Pick-up Block.
2. When checking the laser diode emission, keep your
eyes more than 30 cm away from the objective lens.
WARNING: CHEMICAL CONTENT NOTICE!
The solder used in the production of this product contains LEAD. In addition, other electrical/electronic
and/or plastic (where applicable) components may also contain traces of chemicals found by the
California Health and Welfare Agency (and possibly other entities) to cause cancer and/or birth defects
or other reproductive harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH
FOR ANY REASON WHATSOEVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale
solder fumes or expose eyes to solder/flux vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash
your hands before handling food.
■ TO SERVICE PERSONNEL
1

CDC-775
CDC-775
2
wR, G models
English
➀THIS PRINTING (SEE POSITION SHOWN IN THE ILLUSTRATION) INFORMS THE USER THAT THE APPARATUS
CONTAINS A LASER COMPONENT.
➁THIS LABEL (SEE POSITION SHOWN IN THE ILLUSTRATION) WARNS THAT ANY FURTHER PROCEDURE WILL
BRING THE USER INTO EXPOSURE WITH THE LASER BEAM.
CAUTION : USE OF CONTROLS, ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE
SPECIFIED HEREIN, MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
Swedish
➀DENNA MÄRKNING (SE FIGUR) UPPLYSER OM ATT DET I APPARATEN INGÅR EN LASERKOMPONENT AV
TYP KLASS 1.
➁VARNINGSMÄRKNING (SE FIGUR) FÖR STRÅLNING. INGREPP I APPARATEN BÖR ENDAST FÖRETAGAS AV
FACKMAN MED KÅNNEDOM OM LASER. APPARATEN INNEHÅLLER EN LASERKOMPONENT SOM AVGER
STRÅLNING ÖVERSTIGANDE GRÄNSEN FÖR LASERKLASS 1.
VARNING : OSYNLIG LASERSTRÅLNING NÄR DENNA DEL ÄR ÖPPNAD : BETRAKTA EJ STRÅLEN.
Danish
➀DETTE MÆRKAT ER ANBRAGT SOM VIST I ILLUSTRATIONEN FOR AT ADVARE BRUGEREN OM AT AP-
PARATET INDEHOLDER EN LASERKOMPONENT.
➁DETTE MÆRKAT OM LASEREN ER ANBRAGT PÅ APPARATET SOM EN OPLYSNING OM AT APPARATET
INDEHOLDER ET LASERKOMPONENT.
ADVARSEL : INDGREB BOR KUN FORETAGES AF EN FAGMAND DA DER ER RISIKO FOR RADIOAKTIV
STRÅLING.
ADVARSEL : USYNLIG LASERSTRÅLING VED ÅBNING.
UNDGÅ UDSAETTELSE FOR STRÅLING.
Finnish
VARO! :
AVATTAESSA OLET ALTTIINA NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.
qR, G models
CLASS 1 LASER PRODUCT

CDC-775
CDC-775
■REAR PANELS
▼U, C models
▼R model
▼A model
▼G model
3

CDC-775
CDC-775
4
CAUTION FOR
TRANSPORTING THIS UNIT
When transporting this unit, first remove
all discs from the disc tray and close the
tray by pressing the OPEN/CLOSE but-
ton, and then switch off the power after
you confirm that the display has turned
as follows.
Never switch off the power if the display
does not turn as above, otherwise the
unit will get out of order during transport
because the internal mechanism is not
locked.
5
32 4
■SPECIFICATIONS
■AUDIO SECTION
Output Voltage 2.0±0.5V
S/N Ratio 115dB
Dynamic Range 100dB
Harmonic Distortion+Noise (1kHz) 0.0025%
Frequency Response (2Hz~20kHz) ±0.5dB
Headphone Output
150Ω, 1kHz, –20dB Input 200±40mV
■GENERAL
Power Requirements
U, C models 120V AC 60Hz
G model 230V AC 50Hz
A model 240V AC 50Hz
R model 110/120/220/240V AC 50/60Hz
Power Consumption 20W
Dimensions (W x H x D) 435 x 116 x 404 mm
(17-1/8” x 4-9/16” x 15-7/8”)
Weight 5.8kg (12 lbs 12 oz)
Accessories Pin plug cord
Remote control transmitter
Dry-cell: x2 (Size “AA”, R06)
U ........ USA model
C ........ Canadian model
A ........ Australian model
G ........ European model
R ........ General model
* Specifications subject to change without notice.
■INTERNAL VIEW
12
5
43
qP.C.B. MAIN (2)
wCLAMP ASS’Y
eCM-210 UNIT
rP.C.B. MAIN (1)
tTRAY ASS’Y
435 (17-1/8")
16
(5/8") 100
(3-15/16")
116
(4-9/16")
394
(15-1/2")
404
(15-7/8")
4
(3/16") 6
(1/4")
●DIMENSION
Unit : mm (inch)

CDC-775
CDC-775
5
■DISASSEMBLY PROCEDURES (Remove parts in the order as numbered.)
4. Removal of Table
a. Remove 1 screw ( t) and then remove the Support/
T as shown in Fig. 1.
b. Remove the Plate/Table as shown in Fig. 1.
c. Remove 1 screw ( y) and then take off the Table as
shown in Fig. 1.
Fig. 2
1. Removal of Top Cover
a. Remove 4 screws ( q) and also 3 screws ( w) as
shown in Fig. 1.
2. Removal of Clamp Ass’y
a. Remove 2 screws ( e) as shown in Fig. 1.
3. Removal of Tray Ass'y
a. Remove 1 screw ( r) as shown in Fig. 1.
b. Turn Gear/L0 as shown in Fig. 2 counter clockwise
gradually till immediately before the tray starts to
move and stop it there.
CAUTION : Gear/L0, if turned counter clockwise con-
tinuously, will mesh with the gear of the
tray and the tray will come out. When re-
moving the tray, use care so that Gear/L0
will not mesh with the gear of the tray.
c. Pull out the Tray Ass'y.
Fig. A
IMPORTANT : Installation of Table.
Install the table according to the following procedure.
1) Slide the Lever so that the Gear/RT1 be-
comes free. (Fig.B-1)
2) With the “▲” mark on the Gear/RT1 aligned
with the same mark on the Tray, lock it with
the Lever. (Fig.B-1)
3) Install the Table by aligning it to the thick line
on “ /” mark. (Fig.B-2)
*Check that the Table is locked after installation.
Fig. B-2
●Precaution for installation of the Tray Ass'y.
On Tray Ass'y setting.
Check the Direction of marking “▲” on gear
according to this drawing.
Fig. 1
Gear/L0
Front Panel
Gear/L01
Lever
Tray
Gear/RT1 Fit the Gear/RT1 to “▲” mark.
Fig. B-1
Tray
Table
Marking
Fit the table to the thick line on “ /” mark.
q
q
w
Table
Tray
y
Tray
Gear/L0
r
t
e
Top Cover
Plate/Table
Clamp Ass'y
Support/T
Front Panel
Lock
Unlock

CDC-775
CDC-775
6
5. Removal of CM-210 Unit
a. Remove 5 screws ( u) as shown in Fig. 3.
b. Remove connectors (CB201 & 202) and cables (CB1
& 2, CB300) from the P.C.B. Main.
c. Take the CM-210 Unit out slowly as shown in Fig. 3.
6. Removal of PU Mechanism Unit
a. Remove 2 screws ( i) and then remove the PU
Unit Ass'y as shown Fig. 4.
b. Pull out 4 Pins ( o ) and then remove the PU
Mechanism Unit as shown in Fig. 5.
Fig. 5
Fig. 4
Fig. 3
●Operation Check Procedure
qDisassembly
1) Remove the top cover.
2) Remove the Clamp Ass'y.
3) Remove the stabilizer from the Holder.
Turn the Plate clockwise by 30°while holding
the Stabilizer, and the Plate will come off.
Remove the Stabilizer from the Holder.
wClamp the disc by using the stabilizer.
eSet to the TEST mode and check for any
faulty conditions.
Fig. C
PU Mechanism
Unit
PU Unit Ass'y
o
o
Holder
Lock
Unlock
u
u
u
CM-210 Unit
i
Stabilizer
Frame/Clamper
Plate
Plate
CB201
CB1
CB2
CB300
CB202

CDC-775
CDC-775
■STANDARD OPERATION CHART
“OPEN” appears on the display.
“TRV” signal is output until detection of LIMIT switch.
if FLSW = L (IC301, pin 21) Proceed to next step.
LSON = “H” (IC1, pin 3)
Press OPEN/CLOSE key.
Forced feed return operation.
Clamp down operation.
Tracking Offset autoADJ.
Focus Offset autoADJ.
Disc mechanism unit clamped up.
Feed inward switch research.
Laser ON.
Disc scan.
FOCUS Gain roughADJ.
FOCUS Search operation.
Spindle motor accelerated.
TRACKING servo ON.
Disc servo ON
VCO lock.
Disc table reset.
Tray open.
Tray closed.
Table rotate.
Disc research.
Proceeds to next step after detection of CLAMP switch. (SW400)
Stop after detection of LOADING switch. (SW401)
Proceeds to next step after detection of LOADING switch. (SW401)
DISC “1” is turned to DM clamp position.
Proceeds to next step after detection of CLAMP switch (SW401)
Tracking Gain roughADJ.
TrackingBalanceADJ.(onlyTrayOPEN/CLOSE)
FOCUS BALANCEADJ.
FOCUS LOCK servo ON.
“DISC” flash.
“DISC” from flashing to lighting.
Load a disc in“DISC 1”.
Press PLAY key or push the tray.
FLOCK = “H” →“L” (IC301, pin 8)
TLOCK = “H” →“L” (IC301, pin 7)
7
A

CDC-775
CDC-775
8
Press the STOPkey.
FOCUS GAINADJ.
TRACKING GAINADJ.
After searching the beginning, MUTE is cancelled.
MUTE ON.
TRACK search.
After searching the beginning, MUTE is cancelled.
MUTE ON.
Spindle motor stop.
Laser OFF.
Forced feed return.
*TOC READ ~ Data fetch cycle ~
*
TRACK No.“1” is searched.
~ PLAY ~
Set to SEARCH by means of Y,Tkey.
~ PLAY ~
~ STOP ~
: MUTE OFF = “H”→“L”
: MUTE OFF = “L” →“H”, “0:00” appears on the display.
: LSON = “H” →“L” (IC1, pin 3)
: MUTE OFF = “L” →“H”, “0:00” appears on the display.
(IC301, pin 4)
: FLSW = “L” (IC301, pin 21)
A

CDC-775
CDC-775
■TEST MODE
●Starting TEST mode
Test mode is brought about when the power is turned on while the “PLAY/PAUSE” and “STOP”
keys on the panel are simultaneously pressed and held.
When the test mode is brought about, all the displays light up for about 1 second. ("TEST" on display)
NOTE : To fully operate all test modes the remote control must be used.
9
●Function List of Panel keys Note: “traverse servo” means the same as “feed servo”
FUNCTION
Tray open/close.
Rotating the mode of coefficients. (Coefficient mode➝Coefficient setting➝Product mode) Press-
ing twice will set to the product mode.
Plays if focus servo is effective. TRON, MUTE OFF.
All stop. (Focus, spindle, feed, laser, tray, etc.) Initializes FL display.
Backward traverse move. (If inner SW turns on, traverse is stopped.)
(Coefficient set up mode : upper digit down.)
Forward traverse move.
(Coefficient set up mode : upper digit up.)
Returns to product mode. (Tray and table inoperative.)
Adjustment mode 1 (TR-offset, FO-offset, FO-rough gain adjustment)
Adjustment mode 2 (TR-balance, TR-rough gain adjustment)
Adjustment mode 3 (FO-fine gain, TR-fine gain, FO-balance adjustment)
If not clamped up, measurement the rotating time of the turn table. (Slow speed) (Note 2 :See page 11)
If clamped up, enter EQSW adjustment mode. (In adjustment mode, save EQSW value to EEPROM.)
Decelerates or stops spindle.
Output level down.
(Coefficient set up mode : address down.) (EQSW adjustment mode : value down)
Output level up.
(Coefficient set up mode : address up.) (EQSW adjustment mode : value up)
—
Returns to product mode. (tray and table inoperative.)
Adjustment mode 1 (TR-offset, FO-offset, FO-rough gain adjustment)
Adjustment mode 2 (TR-balance, TR-rough gain adjustment)
Adjustment mode 3 (FO-fine gain, TR-fine gain, FO-balance adjustment)
Turn table turns counterclockwise. (Slow speed)
Turn table turns clockwise. (Slow speed)
Turn table turns counterclockwise. (Fast speed)
Turn table turns clockwise. (Fast speed)
Backward 10 TRACK KICK-continuously
Forward 10 TRACK KICK-continuously
PANEL KEY
OPEN/CLOSE
PLAYXCHANGE
PLAY/PAUSE
STOP
TSKIP
YSKIP
DISC 1
DISC 2
DISC 3
DISC 4
DISC 5
PROG
OUTPUT LEVEL –
OUTPUT LEVEL +
+10
1
2
3
4
5
6
7 NOTE:
8 NOTE:
9
0
NOTE: When the disc table is not positioned correctly, be sure to turn the disc table one full rotation by using the DISC
SKIP key on the remote control unit before canceling the TEST mode.

CDC-775
CDC-775
10
●Function List of Remote Control Transmitter
FUNCTION
Traverse stop
Tray open/close
PLAY (FOON, TRON, TVON (FEON), SPON)
Backward traverse move. (If inner SW turns on, traverse is stopped.)
(Coefficient set up mode : upper digit down)
Clamp down.
(Coefficient set up mode : lower digit down)
Clamp up.
(Coefficient set up mode : lower digit up)
Forward traverse move.
(Coefficient set up mode : upper digit up)
FOON, TROF (Enter focus search if focus servo is off.)
Checks FL display. (Note 3 : See page 11)
FOON, TROF, TVOF (FEOF) (Enter focus search if focus servo is off.)
Rotates or accelerates spindle.
Decelerates spindle.
Backward 150 TRACK KICK continuously
Returns to product mode. (Tray and Table inoperative.)
Adjustment mode 1 (TR-offset, FO-off set, FO-rough gain adjustment)
Adjustment mode 2 (TR-balance, TR-rough gain adjustment)
Adjustment mode 3 (FO-fine gain, TR-fine gain, FO-balance adjustment)
Forward 1 TRACK KICK continuously
Backward 1 TRACK KICK continuously
Forward 30 TRACK KICK continuously
Backward 30 TRACK KICK continuously
Forward 150 TRACK KICK continuously
Enter coefficient set up mode.
SPON (Spindle servo on.)
Output level down.
(Coefficient set up mode : address down.) (EQSW adjustment mode : value down)
Output level up.
(Coefficient set up mode : address up.) (EQSW adjustment mode : value up)
Checks FL display. (Note 3 :See page 11)
Note :Don't use
Switches servo gain (normal or High). Head amp (GCTRL)
DISC SKIP + (Clockwise)
DISC SKIP – (Counterclockwise)
Measurement the rotating time of the turn table. (Fast speed) (Note 2 :See page 11)
FOON, TROF, TVOF (FEOF) (Enter focus search if focus servo is off.)
All stop. (Focus, spindle, traverse, laser, tray, etc.)
Spindle free (off)
Backward traverse move
KEY
MODE
OPEN/CLOSE
PLAY
TSKIP
TEXT MODE
TEXT SRCH
YSKIP
REPEAT
TIME
INDEX
PROG
CLEAR
0
1
2
3
4
5
6
7
8
9
+10
RANDOM
OUTPUT LEVEL –
OUTPUT LEVEL +
DIMMER
FILE MODE
CAPS
DISC SKIP w
DISC SKIP q
DISC SCAN
PAUSE
STOP
TAPE
SYNCHRO
CODE
00
01
02
04
2B
2C
07
08
0A
0B
0C
0D
10
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
1E
1F
2D
4F
50
53
55
56
57
58
CUSTOM CODE = (79)x

CDC-775
CDC-775
11
(Note 3) Checks FL display.
DIMMER TIME
(Note 2) Display at time measurement.
The time display shows the time for 1 rotation of the turn table.
The unit of time is 0.1 second (rotate fast) or 1 second (rotate slow).

CDC-775
CDC-775
12
●Jitter Adjustment
qConnect an oscilloscope and a jitter meter to the test
points EFM and GND.
wSet to the TEST mode.
(While pressing both the “PLAY/PAUSE” and “STOP”
keys, turn ON the power switch.) See page 9 for
TEST mode explanation.
eSet the test disc on the turntable, and press the
“TEXT SRCH” key on the remote control. And then
the disc is clamped up.
rPress the DISC2 key.
(Auto adjustment mode 1)
tPress the DISC3 key.
(Auto adjustment mode 2)
yPress the DISC4 key.
(Auto adjustment mode 3)
uPress the PLAY/PAUSE key.
(Play mode)
iPress the DISC5 key, and check “EQSW ADJ (DC)”
is displayed.
(EQSW adjustment mode)
oPress the OUTPUT LEVEL + or – key, and adjust the
needle of jitter meter to minimum.
Specification : ≤32 nS (3T)
!0 Press the OUTPUT LEVEL + or – key, and adjust the
bottom of EFM signal (eye pattern) waveform clearly.
(Fig. A)
!1 At last press the DISC5 key, and check “00:00”(time)
is displayed.
■ADJUSTMENTS
●Necessary items
Measuring instruments
Oscilloscope : x 1
(Band width of 50MHz or more)
Jitter meter : x 1
Test disc
SONY YEDS-18 (P/No. TX911730),
A-BEX TCD-782 (P/No. TX913350)
or Philips 5 : x 1
V : 0.2V/div H : 0.5µsec/div
AC range 1 : 1 probe
OK (Fig. A)
NG (Fig. B)
Bottom
Bottom
EFM(J180)
GND(J44)

CDC-775
CDC-775
■ERROR MESSAGE
When stopped by any cause, press “STOP” of the remote control while pressing and holding the “STOP”
on the panel key. The operation mode turns to the mode allowing the display of messages.
(The error messages are cleared with the power off.)
ERROR
MESSAGE
E — X 0
E — X 1
E — 7 1
E — 7 2
E — 7 3
E — X 4
E — X 5
E — X 6
E — X 7
E — X 8
E — X 9
E — X A
E r r
●Error Messages List
DESCRIPTION
Data cannot be read after finishing search.
Data cannot be read during PLAY (x = 0), PAUSE (x = 3) or SCAN (x = 2).
At the start, tracking servo is not effective.
At the start, spindle servo PLL is not effective.
At the start, data can never read.
Close switch does not work with tray closed.
Open switch does not work with tray open.
Table does not turn.
Traverse (Feed) inner circumference switch does not work.
Recovery action fails after focus drop.
Clamp down switch does not work with clamp down.
Clamp up switch does not work with clamp up.
MN35511 does not give response of SENSE, with resetting by the unit’s
microcomputer.
* Meaning of each state (“X”) :
(X = 0)PLAY
(X = 2)SCAN
(X = 3)PAUSE
(X = 4)PEAK SEARCH
(X = 5)SEARCH
(X = 6)DISC SCAN
(X = 7)START
(X = 8)STOP
(X = 9)DISC SEARCH
(X = –)EJECT
(X = C) ........... NO DISC
1) Error Code Troubleshooting
Error codes X0 , X1 , 73 ..... Data cannot be read. Error code X6 ........................ Poor table rotation.
TRACKING servo
defective.
FEED servo
defective.
Check by using
another disc.
YES
NO
Pick-up position
Within disc range
Outermost
(on mirror
surface)
Pick-up defective, Spindle system
defective. (Motor fails to run, etc.)
Is disc dirty or
scratched?
Error codes X4 , X5 ................Poor tray loading
operation.
Motor defective.
Control IC (IC400) defective.
Microcomputer defective.
Does tray
operate when
OPEN/CLOSE key is
pressed?
YES
NO
SW401 detection poor.
Microcomputer defective.
DISC
SKIP
NO
YES
Does tray rotate in
TEST mode?
Tray sensor defective.
Microcomputer defective.
Motor defective.
Drive circuit defective.
Microcomputer defective.
Error code X7 .......... FEED operation defective.
(Limit switch fails)
FEED servo defective.
Microcomputer defective.
YES
NO
Feed limit switch
defective.
Microcomputer
defective.
Y...Outward
T...Inward
Is forced feed
operation available
in TEST
mode?
13

CDC-775
CDC-775
Error code X8 ............... Focus drops.
Error code X9 , XA ..... Poor clamp operation.
TRACKING servo
defective.
FEED servo
defective.
Check by using
another disc.
Is disc dirty or
scratched?
YES
NO
Pick-up position
Within disc range
Outermost
(on mirror
surface)
FOCUS servo defective.
Pick-up defective.
SW400 detection poor.
Microcomputer defective.
Is clamp
operation available in
TEST mode?
YES
NO
Motor defective.
Control IC (IC401) defective.
Microcomputer defective.
Is pick-up
caught and locked by
disc table?
YES
NO
Malfunction of tray-table.
“E”…Clamp down
“R”…Clamp up
2) Troubleshooting from System Malfunctions.
a) Tray fails to come out/go in.
b) No sound generated, Sound cut during play.
(but time display advanced properly)
IC1 or IC3 defective.
Is normal
digital data input to
DAC IC (IC100)?
YES
NO
DAC IC (IC100) defective.
Audio amplifier defective.
(IC101 to 104)
MUTING applied.
YES
NO
MUTING circuit defective.
Microcomputer defective.
Microcomputer or
LOADING IC (IC400)
defective.
NO
FLSW = “L”
Limit switch defective.
FEED servo system defective.
Microcomputer defective.
NO
YES
Motor defective.
Poor mechanism operation.
Wire caught.
Loose gear, etc.
Tray starts to
move but stops.
YES
NO
Is output
available at LOADING
terminal?
YES
14

CDC-775
CDC-775
d) Sound skips.
(Time display fails to advance properly)
c) Operates as if no disc loaded.
(although loaded)
Disc clamp defective.
Clamp switch defective.
Microcomputer defective.
YES
Does disc clamp
operate properly?
IC1 or IC3 defective.
Microcomputer defective.
YES
NO
Infrared sensor defective.
(D400)
Microcomputer defective.
Does table
rotate properly?
NO
YES
Is table position
sensor normal?
NO
Poor table rotation.
YES
Is FOCUS
lock done?
NO
YES
Is pick-up at
innermost position?
NO
YES
Jitter defective.
Does spindle
motor run?
NO
YES
Is EFM signal
normal?
NO
Spindle servo system
defective.
Feed limit switch defective.
FOCUS servo system
defective.
NO
Tracking servo system defective.
FEED servo system defective.
FOCUS servo system defective.
Pick-up defective.
Is disc dirty,
scratched or
warped?
YES
NO
Is disc or disc
stabilizer in contact with
mechanism?
YES
Check by using a
known good disc.
Poor mechanism
accuracy.
Floating rubber/spring
deformed.
Pick-up connector
assembly caught.
e) No search provided.
(Sound skipped after search)
NO
IC1 or IC3 defective.
Is disc dirty,
scratched or
warped?
YES
NO
Is TER
waveform normal?
YES
Check by using a known
good disc.
Tracking servo system defective.
FEED servo system defective.
FOCUS servo system defective.
Pick-up defective.
15

CDC-775
CDC-775
■IC DATA
IC301 : µPD78P078GF-3BA
8bit µ-COM
16
Port
P120/RTP0
P121/RTP1
P122/RTP2
P123/RTP3
P124/RTP4
P125/RTP5
P126/RTP6
P127/RTP7
IC
X2
X1
VDD
XT2
XT1/P07
RESET
P00/INTP0/T100
P01/INTP1/T101
P02/INTP2
P03/INTP3
P04/INTP4
P05/INTP5
P06/INTP6
AVDD
AVREF0
P10/ANI0
P11/ANI1
P12/ANI2
Name
OPSW
CLSW
TBL POS
MUTE
RES
DMUTE
TLOCK
FLOCK
IC
X2
X1
VDD
XT2
XT1
RESET
REM
BLKCK
LED
DOWNSW
UPSW
FLSW
CLDCK
AVDD
AVREF0
PON
I/O
I
I
I
O
O
O
I
I
I
I
I
O
I
I
I
I
I
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Function
Opened state of tray sensing switch input. Opened state at “L”.
Closed state of tray sensing switch input. Closed state at “L”.
Table position detect signal input.
Sound output at “H” and sound output muted at “L”.
Hardware reset output of MN35511. Reset at “L”.
Mute output to MN35511. Muted at “H”.
Tracking servo drawing signal input from MN35511. Drawn at “L”.
Focus servo drawing signal input from MN35511. Drawn at “L”.
GND
Ceramic oscillator. (5MHz)
+5V
N.C.
GND
Reset input.
Input from remote control receiving unit.
Sub code, block clock input from MN35511.
Auto display off LED control.
PU unit down limit switch input. DOWN at “L”.
PU unit up limit switch input. UP at “L”.
Feed origin switch input. Feed origin at “L”.
MN35511 subcode frame clock
+5V
+5V
Power ON/OFF detect
N.C.
N.C.

CDC-775
CDC-775
17
Function
N.C.
GND
AN8849 equalizer control.
AN8849 gain control.
Serial I/F input (SUBQ)
Status signal input from MN35511.
Serial I/F clock (SQCK)
GND
Serial I/F input (CD TEXT)
N.C.
Serial I/F clock (CD TEXT)
MN35511 chip select
MN35511 sense input
Serial I/F input ( EEPROM )
Serial I/F output (MDATA/FL driver/ EEPROM )
Serial I/F clock (MCLK/FL driver/ EEPROM )
EEPROM chip select
FL driver chip select
FL driver reset
N.C.
N.C.
Feed servo off signal output.
N.C.
Key scan
N.C.
GND
N.C.
N.C.
Key detect
N.C.
N.C.
No.
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
Port
P13/ANI3
P14/ANI4
P15/ANI5
P16/ANI6
P17/ANI7
AVSS
P130/ANO0
P131/ANO1
AVREF1
P70/S12/RXD
P71/SO2/TXD
P72/SCK2/ASCK
VSS
P20/SI1
P21/SO1
P22/SCK1
P23/STB
P24/BUSY
P25/SI0/SB0
P26/SO0/SB1
P27/SCK0
P80/A0
P81/A1
P82/A2
P83/A3
P84/A4
P85/A5
P86/A6
P87/A7
P40/AD0
P41/AD1
P42/AD2
P43AD3
P44/AD4
P45/AD5
P46/AD6
P47/AD7
P50/A8
P51/A9
P52/A10
P53/A11
P54/A12
P55/A13
VSS
P56/A14
P57/A15
P60
P61
P62
P63
P64/RD
P65/WR
P66/WAIT
Name
AVSS
EQSW
GCTRL
SUBQ
STAT
SQCK
VSS
SUBC
SBCK2
MLD
SENSE
SO
MDATA
MCLK
CS
CE
BLK
FEED OFF
KD4
KD3
KD2
KD1
KD0
VSS
K4
K3
K2
K1
K0
I/O
O
O
I
I
O
I
O
O
I
O
O
O
O
O
O
O
O
O
O
O
I
I
I
I
I
IC301 : µPD78P078GF-3BA
8bit µ-COM

CDC-775
CDC-775
Function
N.C.
Table couterclockwise rotate signal output.
Table clockwise rotate signal output.
N.C.
N.C.
Tray close signal output.
Tray open signal output.
Clamp down signal output.
Clamp up signal output.
N.C.
N.C.
N.C.
M56748 standby control
Model detect 1 (775 : “H”)
Model detect 2 (775 : “H”)
Monitor 1
Monitor 2
Monitor 3
Monitor 4
Monitor (error)
No.
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
Port
P67/ASTB
P100/TI5/TO5
P101/TI6/TO6
P102
P103
P30/TO0
P31/TO1
P32/TO2
P33/TI1
P34/TI2
P35/PCL
P36/BUZ
P37
P90
P91
P92
P93
P94
P95
P96
Name
TBL-L
TBL-R
CLOSE
OPEN
CL-DOWN
CL-UP
STAN
I/O
O
O
O
O
O
O
O
I
I
O
O
O
O
O
IC301 : µPD78P078GF-3BA
8bit µ-COM
18
IC3 : MN35511
Signal Processor & Controller
58 59 5617
STAT
X1 X2 XSEL
TIMING
GENERATOR
PITCH CONTROL VCO
MICRO COMPUTER
INTERFACE
SERVO
CPU
OUTPUT
PORT D/A
CONVERTER
EFM DEMODULATION
SYNC INTERPOLATION
SUBCODE DEMODULATION
CIRC ERROR CORRECTION
DEINTERLEAVE
CLV
SERVO
DIGITAL
AUDIO
INTERFACE
INTER POLATION
SOFT MUTING
DIGITAL
ATTENUATION
PEAK DETECT
AUTO CUE
DSL • PLL VCO
16k
SRAM PEM
(L) PEM (R)
DD type
DAC
PLL
VCO 2
8 TIMES
OVER SAMPLING
DIGITAL FILTER
DIGITAL DE-EMPHASIS
SUBCODE
BUFFER
INPUT PORT
SERVO
TIMING GENERATOR A/D CONVERTER
19
SMCK/FCLK
49
VCOF
69
CK384
8
MDATA
7
MCLK
9
MLD
44
ARF
46
DRF
45
IREF
47
DSLF
48
PLLF
52
EFM
53
PCK/RESY
67
AVDD
62
AVSS
15
SUBQ
14
SQCK
20
CLVS/FLAG6
68
DEMPO
73
SUBC
72
SBCK2
74
SBCK
75
CLDCK
13
BLKCK
55
CRC
78
SDATI
80
BCKI
79
LRCKI
77
DEMPI/TEST2
61 VCOF2
70
IOSEL
41
TOFS
4010 43
LDON
SENSE
WVEL
11
/FLOCK
12
/TLOCK
30
FBAL
31
TBAL
28
FOD
27
TRD
22
TVD
25
ECS
42
PLAY/TRVSTP
29
VREF
21
TRV
16
DMUTE
1
BCLK
3
SRDATA
2
LRCK
23
PC
24
ECM
6
TX
76
IPFLAG
54
FLAG
51
AVSS2
63
OUT1C
65
OUT2D
38
/RFDET
39
BDO
35
VDET
37
TRCRS
34
RFENV
33
TE
32
FE
71
/TEST 18
/RST 5
DVSS1 4
DVDD1 57
VSS 60
VDD
36
OFT
50
AVDD2
64
OUT1D
66
OUT2C
26
KICK

CDC-775
CDC-775
IC3 : MN35511
Signal Processor & Controller
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
Function
Bit clock output for SR DATA
L/R identification signal output
Serial data output
Power supply for digital circuit (+5)
GND for digital circuit
Digital, audio, interface output signal
Microprocessor command clock signal input (data latched at leading edge)
Microprocessor command data input
Microprocessor command load signal input (L : LOAD)
Sense signal output (OFT, FESL, NACEND, NAJEND, SFG, NWTEND)
Focus servo drawing signal (L : when drawn)
Tracking servo drawing signal (L : when drawn)
Sub code block clock signal (BLKCK=75Hz)
Clock input for sub-code Q register
Sub-code Q code output
Muting input (H : MUTE)
Status signal (CRC, STCNT, CLVS, TTSTOP, SQOK, RESY, FCLV, FLAG6, SENSE ,/FLOCK, /RFDET, /TLOCK)
Reset input (L : RESET)
4.2336MHz clock signal output SMCK when command is defaulted. (Note 1) (NC)
SMCK (8.4672MHz), FCLK (7.35kHz) or “L” fixed is selected when command is switched.
With command defaulted : CLVS when IOSEL=H, FLAG6 when IOSEL=L (NC)
These settings can be reversed by command (FLAG6 when IOSEL=H).
Traverse (Feed) forced feed output 3-State
Traverse (Feed) drive output
Spindle motor ON signal L : ON (default) (NC)
Spindle motor drive signal (forced mode output) 3-State
Spindle motor drive signal (servo error signal output)
Kick pulse output 3-State
Tracking drive output
Focus drive output
Reference voltage for DA output block (TVD, ECS, TRD, FOD, FBAL, TBAL)
Focus balance adjustment output
Tracking balance adjustment output
Focus error signal input (analog input)
Tracking error signal input (analog input)
RF envelope signal input (analog input)
Oscillation detect signal input (H : DETECT)
Off track signal input (H : OFF TRACK)
Track cross signal input (analog input)
RF detect signal input (L : DETECT)
Drop out signal input (H : DROP OUT)
Laser ON signal output (H : ON)
Tracking offset adjustment output (NC)
Switched by command. PLAY (Play signal output) when command is defaulted. (NC)
Double speed status signal output (H : double speed) (NC)
RF signal input
Reference current input terminal
Bias terminal for DSL
I/O
O
O
O
I
I
O
I
I
I
O
O
O
O
I
O
I
O
I
O
O
O
O
O
O
O
O
O
O
I
O
O
I
I
I
I
I
I
I
I
O
O
O
O
I
I
I
Name
BCLK
LRCK
SRDATA
DVDD1
DVSS1
TX
MCLK
MDATA
MLD
SENSE
FLOCK
TLOCK
BLKCK
SQCK
SUBQ
DMUTE
STAT
RST
SMCK/
FCLK
CLVS/
FLAG6
TRV
TVD
PC
ECM
ECS
KICK
TRD
FOD
VREF
FBAL
TBAL
FE
TE
RFENV
VDET
OFT
TRCRS
RFDET
BDO
LDON
TOFS
PLAY/TRVSTOP
WVEL
ARF
IREF
DRF
19
(Note 1) At the SMCK/FCLK pin, output does not stop while /RST=L.