Sanyo GCD2000 User manual

m
FILE NO.
Service Manual
Specifications
Tuner section
Fre~uency range .....
Sensitivity ............
Cassette deck section
Track system . . . . . . . . .
Frequency response ....
Signal to noise ratio . . . .
Wow and flutter .......
Tape speed ..........
Fast forward /
rewind time
CD player section
Channels ............
Sampling frequency . . . .
Digital filter ...........
D/Aconversion .......
Pickup ..............
Frequency response ....
Signal to noise ratio . . . .
Total Harmonic Distortion
Wow and flutter .......
CD Changer
Stereo Music System
FM :87.5-108.0 MHz (50 kHz
steps)
M.W :531 -1,701 kHz (9 kHz
steps)
FM :20.7dBf (mono)
----
AM :800 uV/m (AM Loop Antenna)
AC bias, .4-track 2-channel stereo
100-12,500 fiz -
50 dB
0.1 50/0 (WRMS)
1-7/8 i.p.s. (4.75 cmk.ec..)
Approx. 110 sec.. (C-60)
2-channel stereo
44.1 kHz
8xOver sampling
Two 16-bit linear D/A converters
Optical 3-beam semiconductor
laser
20-20,000 Hz
96 dB
0.04’% (1 kHz)
Undetectable
Specification sui]ject to change without notice.
.. -.—. ..———.. ..___
PRODUCT CODE
129 385-04
Amplifier section
Output power . . . . . . . . Max. 3.5w x
distortion) 2(at 8ohms, 107o
Input sensitivity /
impedance -. .VIDEO :300mV /50k ohms
Graphic equalizer -.... f6 dB (100 tiz, 1kHz, 10 kHz)
Bass expander . . . . . . . +8 dB (100 f-fz)
Output impedance . . . . SPEAKERS :8ohms
HEADPHONES :8ohms
General section
Power requirements . . . AC :230-240V, 50HZ
Power consumption . . . 31 w
Dimensions (approx.) . . 14.2” (W) X13.9” (H) X15.7” (D)
(360 x353 x399 mm)
Weight(approx.) . . . . . . 17.1 Ibs (7.75 Kg)
RB-X2000 remote controller
Power source . . . . . . . DC :3V6’SUM-3/AAfR6’s battery
Dimensions (approx.) . . 1X62 (W) X6.9” (H) X0.7” (D)
(41 x175 x18mm)
Weight(approx.) . . . . . . 2.0 oz. (63g) (without batteries)
REFERENCE No. SM580037

LASER BEAM SAFETY PRECAUTIONS (CD) —
Do not look directly at the laser beam coming from the Structural Safety Interlock
pickup or allow it to strike against your fingers, skin, This model has adisc chuck lever and top lid. This disc
etc.
Do not apply power if there is abroken part in the laser chuck lever and top lid prevent to expose the laser beam
for users.
output section of the pickup. 1
INVISIBLE LASER RADIATION EXPOSURE TO BEAM IS DANGEROUS CLASS 1LASER PRODUCT I
OUTPUT POWER :0.6 mW MAX WAVELENGTH :790 nm I
..-
‘--- “u!
E!Eiii3“
.- U
4ANDLING THE PICKUP
b.
,’,
. . .
. . .
1. Shipping and storage cautions
a.
b.
The pickup must be stored in aconductive bag
until immediately prior to its use.
Do not drop it or subject it to impacts.
c.
2.a.
d.
-.— .- .
Repair cautions . .. .. . .
When handling the pickup, be careful not to give it
undue force or shock by your hands. Otherwise the
pickup may malfunction or the PCB may be cracked.
The pickup which has been minutely adjusted before
shipment as one part. Never touch and move the
adjusting points and setscrews of the pickup unless
otherwise described in the item of adjustment to
avoid damage.
BEFORE REPAIRING THE CD PLAYER (CD)—
1.
a.
b.
Astrong magnet is used in the pickup.
Do not bring amagnet or other magnetized object
near to it.
Cleaning the lens
*If dust gets on the lens, clean it away by using an
air brush such as used for acamera lens.
●The lens is held in place by aspring.
If the center of the lens is dirty, carefully clean” it
using cotton swab moistened with isopropylalcohol.
Since special coating is made on the surface of the
lens which is made of plastics, do not use other
kind of alcohol and cleaning fluid to prevent
damage to the lens. Also, be careful not to bend
the lens spring when cleaning. .. ...
.:..
.......
.,.
Preparations
Many ICS, LSI and the Pickup (laser diode) are
used in the compact disc player. These
components are sensitive to static electricity, and
might be damaged by static electricity or high
voltage, so particular care should be taken
regarding this point.
Many precision components and the lens are used in
the pickup.
Never attempt to make repairs, or to store parts,
where the temperature or humidity is high, where
magnetism is strong, or where there is much dust.
2. Notes regarding repairs
a. Be sure to first disconnect the power plug before
attempting to replace any component.
b. All tools, instruments, etc., used for measuring must
be grounded.
Grounding can be accomplished by using a
conductive metal sheet on the work bench.
c. To prevent AV leakage of the soldering iron, ground
its metal part.
d. Repair personnel must be grounded.
!EFORE USE OR TRANSPORTATION
Before use
1. Carefully unpack the unit 3. Remove the sheet and tape which secures the
2. Remove all packing material from around the unit. carousel. ,..
4. Attach the dust Cover.
●-1- -.

i
.. s
BEFORE USE OR TRANSPORTATION
Before transportation 4. Remove the dust cover.
1. Remove all discs from the trays. 5. Attach the transportation sheet and tape.
2. Turn off the power. 6. Confirm the power off when after base mechanism is
3. Disconnect the AC power cord, patch cords and chucking. (Displayed the “NO DISC”)
remote control cord.
ADJUSTMENT (TUNER)
.Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter.
.Use aplastic screwdriver for adjustment. SG RF Level :75 ohm Open voltage
1. FM BAND Antenna: 75 ohm Direct, Modulation :1 kHz, Dev. :~7?5kHz (mono /stereo) .f40kHz (main)
~6.75kHz(pilot)
PARTS STANDARDS
Usually, not to alignment for
T2201 presetted. See note ~
Confirm voltage isabout
L2 104 1.1-1 .3V.
STEP ITEMS TUNING
FREQUENCY INPUT COND~
MEASURE ON OUTPUT CONDITION
INPUT IMEASURE OUTPUT
I1IF(V CURVE) 10.7 MHZ IFSweep generator
.—
t-
87.5 MHz
2COVER
108.OMHZ
DC Voltmeter TP202(H)
—-— TP201(E) Confirm voltage is below 8.5V
..’,
L2102
L2103
II90.OMHZ TP211(H) VTVM TP233(L)
TP212(E) Oscilloscope TP234(R)
TP235(E)
FM SG
(about 8dB) AF output maximum
3TRACKING
FCT201
T2202
IDigital Voltmeter TP203(H)
TP204(E) OV tO.05V. See note@
=H
4Ov
5Vco 98.OMHZ FM SG
(66dB)
-.
SVR23 19KHz k50Hz See note@
L-R. R-L :Minimum
..e..-
---—
6SEPARATION DEV(MAIN) =f40kHz
Confirm stereo indicator lights
up.
Stereo
7Sensitivity 98.OMHZ FM SG
Note :~Confirm IF waveform maximum and symmetric as shown below. If IF waveform is NG, please adjust T2201 as it
become GOOD. A--’dX-”-+=L-
GOOD NG NG
.
,. ,.,
,.
@Be careful so that digital voltmeter earth may not be in contact with other measuring equipments earth.
@Adjust in the modulation off after the stereo indicator light on.
2. AM BAND (No alignment)
F
Antenna :IRE Loop, Modulation :1000Hz 30?
STEP ITEMS
1COVER
2TRACKING
=-l=== 3N OUTPUT CONDITION
INPUT MEASURE OUTPUT
I
-Confirm S8.5V (about 7.7V)
531kHz --—
1701kHz
Digital Voltmeter TP202(H)
-—--- TP201 (E)
+
output :Maximum
----- Adjust to near
the effective sensitivity.
--.-—
LOOP VTVM TP233(L)
Oscilloscope TP234(R)
ANT TP235(E)
+
603kHz AM SG
1404kHz (about 80 dB)
-“”EIConfirm auto tuning stops
----.-
LOOP Digital Voltmeter _
ANT
-2-

ii
.- S
PARTS LOCATION (TUNER)
TUNER P.C.B
TP202 TP201
C2102
~~e ‘J
El
—
T2201
)’
J460C
TP204
I!Qil
o3432
T2202 J43& IIIL
J430
TP235 -TP234
TP233 F
..
.’. .
. . . ..
ADJUSTMENT OF DECK
Tape Speed Adjustment
Connect the FREQUENCY COUNTER to TAPE OUT.
1. Insert the test tape(MTT-1 11N, etc. :3000 Hz) into the DECK 1. Note :Set the test tape near the tape end
STOP button, and eject the test tape.
test tape(TCW-211, etc. :1500 Hz) into the DECK 1.
tape (C-60 Blank tape) into the DECK 2.
REC button of DECK 2 and press the DECK 1/2button.
FWD PLAY button. Both mechanism become normal speed dubbing.
high speed test pin to the high speed position.
2. Press the FWD PLAY button.
3. Adjust SVR401 so that afrequency ~-ounter reading of 3000 t5HZ %obtained: ‘“- ““-
4. Press the
5. Insert the
6. Insert the
7. Press the
Press the
8. Short the
(The mechanism is high speed dubbing.)
9. Confirm that afrequency counter n%ding of 3000Hz t10% (300 Hz) is obtained.
PARTS LOCATION (DECK)
DECK AMP Pc.6 - -
Ell
SVR401
I1
-3-
,:..
....:,.

MEASUREMENTS OF TORQUE
ITEM TAKE-UP TORQUE iBACK TENSION PULLEY TENSION
PLAY :TW2111 (FWD) PLAY: TW2111(FWD) Driving power cassette:
Test cassette PLAY :TW2121(REV) PLAY :TW2121(REV)
I
TW-2412(FWD)
F.FWD/REW; TW2231 REW:Torque Gauge TW-2422(REV)
PLAY 30- 60gr.cm 2.0- 4.5gr.cm >60g
F.FWD 55- 120gr.cm
REW 55- 120gr.cm I
REPLACEMENT OF HEADS
TAPE ‘“B”” TAPE ““A””
BROWN PINK PINK
RED
FROM 6P CONNECTOR BROWN
(FROM 9P CONNECTOR) FROM 9P CONNECTOR BLACK
APPLVCEMEDINETOFIX APPLVCEMEOiNETO FIX
HOW TO CD PICKUP -..
f?
f?
?1?
,. .— -..-..
L
4!!3
=a2F
(SHORT)
!
/
L
4!!3
=$z!!16
I(OPEN )
CD MECHANISM DESCRIPTION
1. Sensor &Switches of CD Mechanism
1.
2.
.’
PHOTO SENSOR :
PSOI 1(PSOO1):Detection stop of DISC TABLE, position for reduce of DISC speed and music No.
SWITCHES :
SWI (with PICKUP Mechanism) :Detect limit position of the PICKUP.
SW2(S015 =S002) :Detect complete of chucking for the DISC.
SW3(SOI 4=S001 ):Detect complete of release of chucking for the DISC.
-4-

CD MECHANISM DESCRIPTION
2. Drive Control of DISC TABLE &PICKUP Mechanism
ISW2 ON ICCW: Counter Clock Wise CW :Clock
INPUT+
%“0
.FNO
b1
2==
No. DETECT NO
YES
PAST AT 70mSEC NO
YES
*
+
YES
MOTOR CCW -0
RETURN
}MOVEMENT DIRECTION OF SENSOR
1.
2.
3.
4.
5.
Unless 10 msec. <tl, the microprocessor is not able to detect it.
(a). If the turntable is rotating too slowly (t2 >70 msec.), or
(b). if the turntable is rotating too quickly (tl <10 msec., the turntable will continue to turn (it will not stop rotating).
If, after the slit for the last disc number (@ in illustration) has passed, the next slit is not encountered for more than
70 msec., the next slit is detected and used as the stop position.
If the turntable is rotating too slowly (t2 >70 msec.), the slits between @– and @~~ ~e-mistaken for stop positions.
,...
The base mechanism will rise at these positions and bump into the turntable.
When the base mechanism is rising or lowering, the motor stops when switch 3is not on if 16 sec.. have passed.
Malfunction.
When the base mechanism is rising or lowering, the next disc is selected or switch 3turns on 4 times when switch
is not on if 16 sec.. have not passed.
The control keys have no effect when the base mechanism is rising or lowering.
Action of CD Mechanism
1)DISC SKIP
-._. .. .-
37
21
-5-
Figure 1
2
... .
,( . . . .
,,, ,,,
. ..

ii
.. ●
Figure 1shows what the inside of the unit looks like when adisc is in play. Pressing DISC SKIP button at this point
causes the spindle motor to stop (disc rotation stops) and the shaft of the sled motor to turn counterclockwise. This
causes the pickup to move in direction D. when the position where the limit switch (SW1 )turns on is reached, and the
sled motor stops. Simultaneously, the spindle of another motor (39) starts to turn counterclockwise, causing the gear
(31 )to move in direction F. This causes another gear(31 )to engage yet another gear (27), making the second gear (27)
rotate counterclockwise. The cam portion (@) of another gear (27) is linked to the boss (@) of the lever (44), so the ro-
tation of the above mentioned gear (27) causes the lever (44) to move in direction J. The slide (45) linked to the boss
(@) moves in direction L(the switch (SW2) turns off), and the bosses (@ and @) of the sub-chassis (21) disengage the
parts (@and @) of the slide (45) that they had been linked to. This frees the sub-chassis (21) so that it can move
downward
.,.
.
. .
,..
.. . .
.,,..
Figure 2
AS shown in Figure 2, one of the gears (28) is equipped with acam. One boss (@) of the sub-chassis (21) en9a9es it
while the second boss (@) provide; ”rotating support for the p’anel fdp (See 82 “in ‘“CD Turntable Exploded V!ew).
Therefore, when the gear (28) rotates, the sub-chassis (21 )moves in direction G(downward) as shown .
Figure 1shows how the assembly looks when the gear (28) has turned, causing the sub-chassis (21) to move down-
ward and the slide (45) to move in direction L.
At the same time, Figure 1shows the switch (SW3) turns on, causing the shaft of the motor (39) to switch from coun-
terclockwise to clockwise rotation. This causes the gear (31) to turn in direction E, engaging another gear (37). The
second gear (37) turns clockwise. As shown in Figure 3, this gear (37) engages the inner gear (@) of the turntable
(70), so the turntable (70) turns in aclockwise direction.
. ... .. .-- .—
70
~3\
J-
r
31
.~
,STOP
Y
‘Psol 1
POHTO
SENSOR
\
DISC No.
STOP
.
,’
-6-
Figure 3

.-
AS the turntable (7o) rotates, the sensor (PStM 1)detects the slits (@ and @) in it. The first slit (@) is used tO detect the
disc number and the second slit (@) to detect the stop position. When the senmr (PSO11 )detects the specified disc
number*, the shaft of the motor (39) begins to turn more slowly, and the turntable Sows down. When the next slit (@) is
detected, the rotational direction of the shaft of the motor (39) again reverses and Nbegins to turn counterclockwise. As
shown in Figure 1, this causes the gear (31} to turn in direction F(Figure 1). As shown in Figure 1, another gear (28)
then starts to turn and, in the reverse of the operation described above, the sub-chassis (21) rises and the slide (45)
moves in direction K,eventually ending up as shown in Figure 5.
At this point, the switch (SW2) turns on and the motor (39) stops. At the same time. the sub-chassis (21) is locked in the
lowered position by the slide (45).
Note :●Specified disc number ;DISC SKIP button :the next disc number.
39
&s
37 35
1
,- .1
(!! ~
,. )
.
Y
-\
\l/
31
Figure 4
2)POWER ON (When AC Cord is First Plugged In)– Refer to Figures 1-5-
. .
Basic operations :The turntable rotates to the disc number 1po&ion, %d check stet astet the base mechanism takes
. .... ..
figure 5
1,
2.
place.
If the switch SW3 is not on :
The spindle of the motor (39) rotates counterclockwise, lowering the sub-chassis (21 ). When the switch SW3 turns
on, the rotational direction of the motor shaft changes to be clockwise. This causes the turntable (70) to rotate. When
the sensor (PSO11 )detects the disc 1stop position, the motor (39) switches back to counterclockwise rotation, rais-
ing the sub-chassis (21 )and performing checking. When another switch SW2 turns on, the motor stops.
If the switch SW3 is on :
The spindle of the motor rotates-clockwise. This causes the turntable (70)-to rotate. When the sensor (PSO11 )de- . .,
(. .:
tects the disc 1stop position, the motor (39) switches back to counterclockwise rotation, raising the sub-chassis (21 )
and performing checking. When another switch SW2 turns on, the motor stops.
3)POWER OFF (MANUAL Switch Off)
Basic operations :1. If the motor (39) was stopped, it remains so.
2. If the motor (39) was running, then the motor stops.
..,’.
-7-

.. ,
STANDARD MAINTENANCE FOR CD
1. Applying Grease and Grease point
1)DISC Table (Top
2)CD Mechanism Block A
.“..
.,. ,
Note: S4W4G13EASE SG-7 =SANYO Type N0.HZGSNGROSG7
FLCW OIL 949P =SANYO Type No. HZOFOIL949P
Note: MC-GREASE EM50L =DOW CORNING Type No.
MOLYKOTE EM-50L
Attsr Insert gear lever and special waskf, SPPIY ip@ o
MC-grease EM!50L to 1/3 length portion of shaft APPLY SANGREASE
WASHER tSG-7
APPLY
-%
MC-GREASE EMSOL ‘“’
GEAR LEVER VIEW -A
&
&’
APPLY MC-GREASE EM50L
GEAR ALL AROUND
. ..... $? ‘?.
-. -. .... ... ......
I
-1
1LY SANGREASE
SG-7
I
.. .-.
r--l
After
Lever
Note :After inserting the gear lever and the special washer into the shaft, apply MC-Grease EM50L to the upper 1/3
of the shaft as shown in view-B above.
-8-

3)CD Mechanism Block B
APPLY SANGREASE SG-7
7Ir&
APPLY
FLOIL OIL 949P
(LITTLE )
-...
4)CD Mechanism Block C
APPLY
MOLYKOTEEM-50L .=
GEARALLAROUNO
..
5)CD Mechanism Lead Retainer
.,—
r%
pyu
‘L_7 ‘“-
IORANGEI& 0
@!$
x
-9-
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