Sanyo GCD 1500 (AU) Service Manual
l?
r-
I FILE NO.
I
Service Manual
Specifications
Tuner section
Frequency range . . . . . .
Tuner section
L..._
Drive system . . . . . . . . .
Cassette deck section
Track system . . . . . . . . .
Frequency response . . . .
Signal to noise ratio . . . .
Wow and fiutter . . . . . . .
Tape speed . . . . . . . . . .
Fast forward /
rewind time . . . .
CD piayer section
Channels . . . . . . . . . . . .
Sampling frequency . . . .
D / A conversion . . . . . . .
Pickup . . . . . . . . . . . . . .
Frequency response . . . .
Signaito noise ratio . . . .
Total Harmonic Distortion
Wowandfluiter . . . . . . .
CD Stereo Sound
System
GCD 1500 (AU)
PRODUCT CODE No.
129 395 03
FM :87.5- 108MHz
AM :530-1,700 kHz
Beit Drive
AC bias, 4-track 2-channel stereo
100-12,500 Hz
50 dB
0.1 5% (WRMS)
1-7/8 i.p.s. (4.75 cmLsec..)
Approx. 120 sec.. (C-60)
2-channei stereo
44.1 kHz
Duai 16-bit linear D/A converters
Optical 3-beam semiconductor
iaser
20-20,000 Hz
94 dB
0.04% (1 kHz)
Undetectable
Ampiifier section
Output power . . . . . . . .
Graphic equaiizer . . . . .
Bass expander . . . . . . .
Output impedance . . . .
Generai section
Power requirements . . .
Power consumption . . .
Dimensions (approx.) . .
Weight(approx.) . . . . . .
Max. 5W x 2 (at 8 ohms, 10%
distortion)
~ 6 dB (300 Hz,
1 kHz, 10 kHz)
+ 6 dB (1OO Hz)
SPEAKERS : 8 ohms
PHONES : 8 ohms
AC : 230- 240V, 50HZ
28 W
14.2” (W) X 12.3” (H) X 8.9” (D)
(360 x 365 x 355 mm)
16.8 Ibs (7.6 Kg)
- ._
Specification subject to change without notice.
r“
REFERENCE No. Sh&580038
LASER BEAM SAFETY PRECAUTIONS (CD)
Do not look straight at the laser beam from the pickup and do not
Structural Safety Interlock
point the beam at your fingers or any other part of your body.
This model has a disc chuck lever and top lid. This disc chuck lever
Note: The laser beam must never be allowed to enter the eyes since
and top lid prevent to expose the laser beam for users.
this
may damage the eyes.
Power must never be supplied to a pickup with a damaged laser
output part (objective lens, etc.).
INVISIBLE LASER RADIATION EXPOSURE TO BEAM
IS DANGEROUS CLASS 1 LASER PRODUCT
OUTPUT POWER : 0.6 mW MAX WAVELENGTH : 790 nm
1,
a.
b.
c.
d.
2,
a.
b.
c.
CAUTION-INVISIBI.ELASER
---I
t
RAOIATIONWHENPANEL
.--4
OPENANOINTERLOCK
OVERRIOOEN.
H
EE!
1 I %dl-
W
Precautions for handling the pickup and
semiconductors (particularly the ICS)
The pickup and semiconductors (particularly the ICS) may
be damaged if they come into contact with a source of
high voltage static electricity. Do not bring them,
therefore, into contact with or into the vicinity of anything
which has been charged with high voltage static.
The pickup consists of a large number of optical and
precision parts. Do not store or repair it, therefore, in any
location with a high temperature, high humidity, high
magnetic fields or high dust concentration. (Since the
pickup contains a powerful magnet, it must not be brought
near any magnetized objects.)
Do not apply strong external pressure to the pickup or
subject it to impact. Actions like these can cause the
printed circuit board to crack or malfunctioning to occur.
The pickup is a single integrated part which has been
very precisely adjusted. Therefore, its adjustment points
and set screws must not be touched.
How to prevent static during handling
When replacing any of the parts, disconnect the power
plug from the unit being repaired.
All measuring instruments, tools and repair equipment
must be grounded.
Cover the work bench where the
repair work will be done with a grounded electrically
conductive sheet.
Ground the metal part of the soldering iron in order to
safeguard against leakage of electricity from the heater.
,,,
r
d
[F,]
Repair personnel must wear grounding bands around their
wrists to discharge static picked up by their bodies. These
bands are grounded through a resistor (with a 1Mf2
resistance).
Note: Under no circumstances must be the grounding bands
e.
3.
a.
b.
be grounded without a resistor (with a 1ML? resistance)
since doing so involves the risk of electric shocks.
Since static in the clothes of the repair personnel will not
be discharged by wearing grounding bands, every care
must be taken not to allow the clothes to touch the pickup
and semiconductors (particularly the ICS).
>’” “
The pickup, which is a single integrated part, is kept in a
conductive bag. Use this bag to convey the pickup from
one place to another. In order to avoid damage resulting
from static which may occur when the pickup is removed
from the bag, make sure that it is not placed on top of the
bag.
Cleaning the lens surface
Blow off dust on the lens using the kind of air brush which
is used for cameras.
Remove stubborn dirt with a cotton swab dipped in
isopropyl alcohol. Do not use any other type of cleaning
fluid since it may mark the plastic lens.
Notes:
●Do not use too much isopropyl alcohol: the excess
may seep inside the pickup.
● The lens is held in place by a very feeble support
spring. Therefore, when cleaning the lens, avoid
applying any more force by the cotton swab than is
necessary since this may bend the support spring --._out of shape.
-1-
TUNER ADJUSTMENT
PREPARE :
FM 750HM UNBALANCE DIRECT
1. For adjustment, change oversetting of switches and controls to the following position.
DUMMY PAD
FUNCTION: TUNER
FM MODE:ST
BALANCE : Mechanical center.
● Use a plastic screwdriver for adjustment.
S.Y$O
●
Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter.
● Set the dial position to very left line of dial scale.
GENERAL ADJUSTMENT CONDITIONS
Standard output level :50 mW(O.63V/8 ohm)
RF Level:75 ohm, Open SG voltage dB,uV
Standard moderation: FM Main 1 kHz * 22.5 kHz Dev.
Pilot * 6.75 kHz.
Power source: AC 240 V 150 Hz
(1)Fft
F
STEP
‘w) ‘
BAND Antenna :75 ohm Direct Modulation: 1kHz Dev.: t 22.5kHz (mono/stereo), f 6.7 Sk Hz(pilot)
FREQUENCY INPUT CONDITIONS OUTPUT CONI
ITEMS
INDICATED
MEASURING
CONNECT- MEASURING
POSITION INSTRUCTIONS
IONS INSTRUCTIONS
FM Sweep Gen-
V-Curve
erator (10.7 MHz
TP101(H)
FM Sweep
IF
98.0 MHz
Non Modulation
S-Curve Small Input)
TP102(E)
Generator
u--
Tuning
2
Cover
E
3
4
Tracking
FM-SG(66dB)
● Vco 98.0 MHz
( Non
FM ANT
Counter
Modulation)
TERMINAL
TP204(H)
I-=!!&&
TP203(E)
I
T2202
1+
‘“~’3=-l-
Tuner Out
H
L2 102
Max.
(UR,E)
VCT21
TP201(H)
SVR21
76~0.2kHz
TP205(E)
● : Use IHF filter adjusted from 200-15000 Hz BPF. Set the Mode switch to STEREO position. When connect counter should be inserted
220k ohm resist in series.
L,:
(2) AM BAND
Antenna : IRE Loop, RF Level: 50 ohm Open SG voltage d8,dJ, Modulation :1 kHz 30%
F
1
I
IF
Tuning
Low
2
Cover
High
Low
3
Tracking
High
I
AM Sweep
4S5 kHz*
Generator
=2-=
+ ‘“-sG(=75dB)
1400 kHz
I
IONS
OUTPUT CONDITIONS
ADJUST-
CONNECT-
MEASURING
CONNECT-
ING
STANDARDS
IONS
INSTRUCTIONS
IONS PARTS
IRE
LOOP
VTVM
Ant.
Oscilloscope
IRE
LOOfl
VTVM
Tuner Out
H
L2151
Max
Ant. Oscilloscope
(UR,E)
VCT23
Note:
● 8e careful to adjust the center frequency of IF output to the center of ceramic filter.
L
i
-2-
Fii
PARTS LOCATION (TUNER)
DIAL ROPE
TP151 TP152
e==+
—00—
r- ‘7
w
TP102
T2201
T2203
❑
mm-+
❑
+%
L2103
0 ,g,02
~<.d ,
‘ C23;P’= vc!!2vc~
TP201 @ i
,(2,vg3
T2202
SVR21
m “’2CASE) 0
SW201
lip
I
\
.-!F-
STRINGING
POINTER
(SET POINTER END OF THE TAIL)
APPLY CEMEDINE #575
3 Ah”
0/’
6
@
/
\
. Yl\
— 51021mm
I
( Inner Dimension )
-1
/A~+
BOND
+&@
-k NOTE : DIAL ROPE MUST NOT CROSS.
4 %NS / ~ \ 2 TURNS
-3-
ADJUSTMENT OF DECK & TORQUE
Amplifier Adjustment
* lnputterminal: LINEIN
Item
Deck
Test
Input’
DolbySw output
Adjust
Tape
Point
Remarks
1
Head
TAPEA
VTT738 -
OFF
Azimuth
Adjust so as 10kHz output
Azimuth
TAPEB
OS(T
Screw
become maximum.
TAPEA TCC130
SVR502
2
Playback
OFF
TAPE
SVR602
Adjustment so as TAPE OUT
Level
TAPEB
200rrW/m -
OUT
SVR501
output become 0.54V.
SVR601
3
Rec / Play
TAPEB AC224
1kHz
Level
-19dB
OFF
y:; g:::; Adjust to obtain 0.4V on VTVM.
4
Rec I Play
TAPEB
lKHz(-30dB)
TAPE SVR504
Adjust to obtain same output of
Frequency
AC224 10KHZ(-30dB) ON OUT
SVR604
1kHz and 10kHz.
Note. 1.
2.
3.
Perform BIAS alignment by SVR 504,604 so as No.3 satisfy spec of all item. Perform output alignment by
SVR503,603.
During alignment, measurement Beat cancel SW is at 1 condition fundamentally,confirm. fUP frequency
characteristic, dolby effect also by 2 condition , when ship out set SW to 1 position.
Fix to MAIN VR the position that SP output playing VTT722 is about 2.83V-1 OdB (2.83V = 1W output).
[
R-ch ~SVR64)2 -
TAPE A
L- ch~SVR502
[1
R-ct4fsvR601
TAPE B
tiL-c~SVR501 ,
I
PLAY GA1 N
ADJUSTMENT
.0
SVROO1
?
+
I
a
CNOO
Q,
nfT0T03Y5
~~’
SPEED
TAPE SPEED
~-!~-~!~ch,
TEST POINT ADJUSTMENT
BIAS
REC /PLAY GAIN
ADJUSTMENT ADJUSTMENT
Tape Speed Adjustment
Step Speed
Deck
Test Tape
SVR
Tape Counter
Remarks
1 Normal TAPEA MTT-lll N 3000 ? 5Hz *
2 Heigh TAPEA
SVROO1
TCW-211
-40-70Hz
*Memorize the tape speed on counter. Confirm that the speed of TAPEB is in 40-70Hz against TAPEA.
1.
Set the test tape(MTT-111 ) to “TAPEA” deck.
2. Adjustment to obtain the tape speed counter at Play of step 1.
3. High speed adjustment should be made after normal speed adjustment.
4. Set the TAPEB mechanism is record made with C-60 Blank cassette tape.
5. adjustment should be made at the ending portion of the tape.
6. Set the Dubbing speed “HIGH”.
7. Set the testtape(TCW-211 ) to “TAPEA” deck.
8. Confirm the indication of the tape speed counter within 2 second after push the PLAY(TAPE A) and REC(TAPE B)
button.
Item Take-up torque Back tension
Pulley tension
Test cassette
PLAYTW211 1
PLAYIF.F:TW211
Driving power
FFWD/REW;TW2231
REW:Torque Gage cassette: TW-2412
PLAY
30-60gr.cm
2-4.5gr.cm
>
6(Jg
F.FWD 55-120gr.cm
REW
55-120gr.cm
-4-
REPLACEMENT
OF HEADS
TAPE “B”
TAPE “A”
BROWN
WHITE
RE13
‘lN\K\ YELLOW \ /
FROM 6P CONNECTOR
BRO’WN
(FROM9P CONNECTOR)
RED
WHITE
FROM 9’P CONNECTOR BLACK
APPLVCEMEDINE TO FIX
APPLY CEMEDINETO FIX
SCHEMATIC DIAGRAM (TURN TABLE)
LG .
---------- ,
,
_________ .
RG’‘
(
L
I
CARTRIDGE
I
,1 ,
I ,1 ,
ADJ
USTM
33 RPM HOLE
FOR ADJUSTMENT
0
(a) 0
LEAF
SWITCH
MOTOR : MMI -6S2RWA0
Ii: 11:
kAA
lK(B)
45 Ipm
blw
CD MECHANISM
,. —
1)
1)
2)
3)
2)
1)
2)
3)
4)
‘-
5)
REMOVAL
Preparations
Do not apply unnecessary force to the pickup when handling it. Care should be taken not even to touch the lens or drive
circuit sections.
Do not apply unnecessary force (do not pull or push it forcefully) to remove the disc tray from its inside position.
Unnecessary force may break the teeth on the tray gear (CM6).
In the descriptions which follow, the numbers in the parentheses after the parts are reference numbers in the exploded
views. Refer to these views.
Removing and installing the disc tray
2-TH TOOTH
OF TRAY GEAR
Remove the stop screw (YI O) of the disc tray (17). (~)
Pull the disc tray (17) all the way forward by turning the
tray drive gear (CM12) clockwise. (~)
Note: Do not take hold of the disc tray (17) and pull it out by
force.
Push the catch on the disc tray (17) in the direction
shown by the arrow, and draw out the disc tray (17).
To install the disc tray, turn the gear (CM12) in the
direction of the arrow as far as it will go. (@)
Align the disc tray (17) with the mechanism chassis
(CM39).
6) Push the disc tray (17) toward the rear, and interlock it
L
/
///
7)
3)
(1)
1)
2)
‘L
3)
4)
5)
with the tray drive gear (CM I 2) as shown in Fig.@ .
Secure it with the screw (Yl O) which was removed in
step 1).
Disassemblingthe mechanism
Removing the pickup block
Remove the disc tray (17). (Refer to steps 1), 2) and 3)
of the section entitled “Removing and installing the disc
TRAY MOVE GEAR (CM) (CM,) TRAY GEAR
tray.”)
u
Turn the tray drive gear (CM12) counterclockwise (~),
and move the pickup in the direction of arrow (@) as far
as it will go.
Remove the spring wire (CM27) with tweezers. (@)
Remove the screw (CM11 ), and also remove the disc
tray (17) and washer (CM1 3). (@)
Now remove the pick rack gears (CM I 6 and CM1 9).
Note: It will not be possible to remove the pick rack gears
(CM16 and CM19) unless the pickup has been moved
all the way in the direction of arrow (@).
6) The pickup block can now be removed by taking out the
screw (CM51).
Note: If the timing gear (CM23) is in the state shown by “X”
in the figure on the right, put it in the state shown by
“o”.
‘L
F’
-6-
‘mm! -
‘“
- --’”
Iii
—
MECHANISM REMOVAL (CD)
(2) Replacing and lubricating the pickup
‘<q
‘\
1) Pull out the two pickup rails (CM43) from the chassis
SHAFT ~
(CM50).
,/
@
2) The pickup (CM52) can now be removed once the tw,o
pickup rails (CM43) have been taken out.
3) When the pickup has been replaced, be sure to wipe the
crvl,rl & /
SHAFT
two pickup rails (CM43) cleanly and apply grease (FLOIL
G-474B) around the entire circumference of the rails and
FIX BY THE CEMEDINE #575
a
along their entire length.
4) Pass the two pickup rails (CM43) through the new pickup
@&e_
~c
(CM52), inserf them into the chassis (CM50), and fix them
in place at an angle of 45” as shown in the figure.
Notes: a. When applying the grease, do not allow any grease
m
o
@ o ,G-,,h,)
FLOIL
to adhere to any other parts.
b. If a part (indicated by the dots in the figure) of the
chassis (CM50) is damaged in the process of
removing or inserting the two pickup rails (CM43)
from or into the chassis (CM50), wipe the damaged
area with a cloth dipped in alcohol (normal hexane),
IL
and bond it together using a bonding agent
L/ 45°
(3)
1)
2)
(Cemedine #575).
e
,,.
#
/ #k
@?J >P-
Replacing the loading/sled motor
* [>
The loading/sled motor (CM38) can be removed from the
7 A
chassis (CM39) once the screw (CM24) securing the
motor (CM38) is removed.
Mount the new loading/sled motor (CM38) onto the
chassis (CM39) using the screw (CM24).
CM24 ?
CM38
In
ATTACHMENT ANGLE
OF MOTOR
.
~~
o
0 0.
O*
RED MARK
1 ‘% m-
(4)
1)
2)
3)
VI
SHAFT
Checking the loading/sled motor’s operation
As shown in the figure, connect an ammeter and a DC
power supply to the loading/sled motor (CM38), and set
the tray open and end switches to the “off” [open]
positions.
Check that the pickup (CM52) moves smoothly without stopping from the inner circumference of the compact
disc toward its outer circumference when a DC 0.6V
voltage is applied from the DC power supply.
The disc tray is housed inside and the gear (CM9) slips
when a DC 4V voltage is applied from the DC power
supply.
Check that the ammeter indicates 120mA or
more at this time.
——
-“
L---------
-7-
m
MECHANISM REMOVAL (CD)
.—
4)
(1)
1)
2)
Check points for CD mechanism assembly and
lubrication
Lubricating and mounting the tray slide
Apply grease (FLOIL G-4748) to the area indicated by the
diagonal
in the figure.
When inserting the tray slide (CM1 5), set the position
where it is installed vis-a-vis the base/tray timing gear
(CM20) as shown in the figure.
y
P
BASE / TRAY
v I TIMING GEAR (CM20)
(3)
1)
2)
3)
4)
(2)
1)
2)
3)
Installing the tray gear
Move the tray slide (CM I 5) in the direction of the arrow
0.
Engage the gear section of the tray slide (CM15) with the
inner gear of the tray gear (CM6) at the center line, as
shown in the figure.
Align the tray move gear (CM3) with the position
(0) of
the hole in the outer gear of the tray gear (CM6), and
engage the tray move gear (CM3), as shown in the figure.
TRAY
SLIDE
CM6
Installing the base up/down slide and timing gear
Move the base up/down slide (CM14) in the direction of
the arrow @, and set the gears at the positions shown in
the figure.
Insert the timing gear (CM23), and mount it using the
screw (CM21 ).
Turn the timing gear (CM23) counterclockwise.
TIMING GEAR
BASE UP/ DOWN
@JF~:~4
\
v SCREW (CM21)
@
Hook the gear tension spring (CM22) onto the timing gear
(CM23).
msH’oN
-8-
.
MECHANISM REMOVAL (CD)
(4) Lubricating the base lever
(5)
Apply grease (FLOIL G-474B) to the ~~ area in the figure. 1)
2)
3)
1
I
(6) Arranging and securing the leads
Lubricating the pickup sled gear and clutch gear
Apply grease (FLOIL G-474B) around the entire
circumference of the lower gear of the pickup sled gear
(CM1 2), as shown in the figure (w area).
Apply grease (G-333) around the entire circumference of
the outer clutch gear (CM9).
Apply grease (FLOIL G-474B) to the ~ part of the outer
clutch gear (CM9) where it makes contact with the inner
clutch gear (CM8).
-CM12
L&h-l
I
CLUTCH INNER GEAR ~
~ ‘“84 w
pJ@._Jp,
p!??d
CLUTCH cM9~
OUTER GEAR n
k-w-oca
1) As shown in the figure, set the pickup (CM52) at a position on the innermost circumference of the compact disc, and pass
the leads from the pickup (CM52) and spindle motor (CM48) through pin (a) of the chassis (CM39). Arrange the leads from
the loading/sled motor (CM38) and sensor switch (micro switch) (CM26) by passing them through point (b) in the chassis
(CM39). After securing the leads with the lug (CM41 ), check that the pickup (CM52) moves smoothly without the
interfering with its movement.
2) If no problems arise in the @ check, secure the points shown in the figure using a bonding agent (Cemedine #575).
~ FLOIL(G-L7LB)
TO CN101 CO PCB
BE NO1
3P
4P
~L
o
+
lx
-3
1°
leads
.
.
CUkHION
NOTE THE LAG PORTION
-9-
CD ADJUSTMENT
Electrical Adjustment
Preparations for Adjustments
So far we have presented explanations regarding compact
Measuring instruments, tools and filter
disc player handling, notes prior to repair, handling the pickup
(1)
Test disc. : YEDS 18 (Sony)
and disassembly of fhe unit. Be $w’e to carefully read these
(2)0sclllIwMpt3:SS5711 (1OMHZ or dua[ phenomenon)
instructions before making any adjustments.
or Memoryscope: DSS6521 (Storagescope)
r
Notes :a.
b.
c.
1.
Initial
(3) Screw drivers (non-metalic) for adjustments
The adjustments can be using the equipment produced by other manufactures provided that the
performance of that equipment corresponds to that of the above listed models.
Use a 10:1 probe for observing signals on the
oscilloscopeand storage scope.
Test disc is subject change without notice.
set up
1. Set the SVR11 to the I
e
SVR1l
Initial set
(Mechanical center)
2. Tracking Balance Adjustment (SVR11)
1. Connect the oscilloscope to
TPI 03 (TE) and TP104
5. Adjust SVR11 so that the
TE (Tracking Error) signal
(GND.).
waveform of
TP103 on the oscilloscope is vertically sym-
2. Turn
on the power of the unit. Insert test disc .
metrical relative to OV. (See figure as follows)
3. Playback the test disc.
4. Continuously
press the forward
ward search ~ button to do it,
TP103
TP3
(TE)
Ov
Note: If this adjustment is imperfect, the sled motor (pickup
search N or back-
sending motor)
willrun and normal play will be dis-
abled.
44 SEARCH
Fig.1 SEARCH W
# Other Adjustment (SVR11)
Ov
TP1
(RF)
TP3
(TE)
44 SEARCH
Ov
F!g.2
1.
2.
3.
Connect the oscilloscope to TP103 (TE) and TP104
4.
Press the memory switch,
(GND.). 5. Adjust
SVR11 so that the TE signal (Traverse) waveform
Press the Open/Close switch and Memory switch. And of TP103 on the oscilloscope is vertically symmetrical relturn on the power of the unit ative to OV. (See figure as above Fig.2 )
Playback the test disc.
For Play mode. Press the Play/Pause switch,
-1o-
i
,.
CONFiRM—--–
Confirm the progress state
. Be able to confirm the progress of outline movements by
service mode, And able to judging at any section makes error
with state at no read disc. For the service
mode, ,power on with simultaneously to push the service mode OPEN / CLOSE
key
and MEMORY key. If it was in the service mode, release the other keys.
Indicate the “-”
at ten place of TRACK No., and, input a number at one place by an indication. Display as follows to active
progress with correspond the each number. “i, \
TRACK
hlo.
.,
PROGRESS
STATE
I
-o
TRAY CLOSE- COMPLETETHE STOP
-1
BEGINOF FOCUSSEARCH!- END OF FOCUSSEARCH
i
J
-2
BEGIN OF TOC READ -“END OF TOC READ
-3 NO INPUT THE DATA OF SUB-Q
I
-4
COMPLETE THE TOC READ
I
Confirm the key input Display as follow to active indication with correspond the each key.
1.
2,
3.
4
Power on with simultaneously to ush the ,service mode
P
6. Next push the
MEMORY key.
OPEN / CLOSE key and BACK SKI key.
PLAY ●
--
---,
Next push the OPEN /
CLOSE key.
PLAY >
17 . . . . .
)_/
●
Next push the RANDOM key.
E
Next push the EDIT key.
I
.1 ,’.
1
.,
“...,.
,.,
,,
PLAY ➤
PROG,
SIDE-B
‘“
/–l ----- - I
)_l
●
5. Next push the REPEAT key.
PLAY *
PROG.
SIDE-B
I–l -----
c - I_!
.
7,
8.
PLAY >
PROG.
SIDE-B
es/-l_ -- .~- /_/
.
Next push the FORWARD SKIP key.
PLAY >
PROG.
SIDE-B
O//;l (....
~- _
.
Next push the PLAY I PAUSE key.
PLAY ➤
PROG.
SIDE-A
SIDE-B
y; /
~-_-.*--
9.
Next push the STOP key.
c
,.
-11-
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