Sony CMT-101 / HCD-101 / TC-TX101 Service Manual ▷ View online
— 9 —
There are two methods to enter the TEST mode.
• How to Enter the Test Mode - 1
Remove the AC power cord from wall outlet, and press [EJECT
6]. While pressing [EJECT 6], connect the AC power cord to
wall outlet.
6]. While pressing [EJECT 6], connect the AC power cord to
wall outlet.
• How to Enter the Test Mode - 2
(This method toggles between “Entering the TEST Mode” and
“Exiting the TEST Mode”.)
Turn on the main power. While pressing [TUNING +], press
[DBFB], release hand from [DBFB] then press [FUNCTION].
(Keep pressing [TUNING] all the way.)
Pressing these buttons again in the same order exits the TEST
mode.
“Exiting the TEST Mode”.)
Turn on the main power. While pressing [TUNING +], press
[DBFB], release hand from [DBFB] then press [FUNCTION].
(Keep pressing [TUNING] all the way.)
Pressing these buttons again in the same order exits the TEST
mode.
* The small ATT segment lights in the center top of display during
the TEST mode.
* To exit the TEST mode, disconnect the AC power cord from wall
outlet, or use “How to Enter the TEST Mode - 2”.
1. Audio volume control setting (Can be adjusted only during TEST
mode.)
Press [CD STOP
Press [CD STOP
p] and [VOL–] at the same time
→
VOL MINIMUM appears
Press [CD STOP
p] and [VOL+] at the same time
→
VOL MAXIMUM appears
*
The audio volume data is kept stored even after the main power
is turned off.
is turned off.
2. Audio balance setting (Can be adjusted only during TEST
mode.)
Press [CD STOP
Press [CD STOP
p] and [DBFB] at the same time
→
LEFT 10 appears
Press [CD STOP
p] and [FUNCTION] at the same time
→
RIGHT 10 appears
Press [CD STOP
p] and [CD EJECT 6] at the same time
→
CENTER appears
* The audio balance data is kept stored even after the main power
is turned off.
3. Key test and FL display tube test (Can be adjusted only during
TEST mode.)
• Press [VOL-] and [BAND] at the same time
• Press [VOL-] and [BAND] at the same time
→
All FL tubes
light. Pressing the following key in this status enables key
checks as follows.
checks as follows.
• Display depending upon the pressed key
[FUNCTION]
[FUNCTION]
→
KEY NO. 1
[VOL –]
→
KEY NO. 2
[VOL +]
→
KEY NO. 3
[BAND]
→
KEY NO. 4
[TUNING+]
→
KEY NO. 5
[EJECT
6]
→
KEY NO. 6
[TUNING –]
→
KEY NO. 7
[STOP
p]
→
KEY NO. 8
[PLAY
^]
→
KEY NO. 9
[DBFB]
→
KEY NO. 10
• [POWER]
→
Returns to the TEST mode
* Note: After all keys are (KEY No.1 to KEY No.10) tested,
CHECK OK!! appears.
The following items have no relation with the TEST mode.
4. Initial setting (All clear of all memories)
Disconnect the AC power cord. While pressing [POWER],
connect the AC power cord to wall outlet.
connect the AC power cord to wall outlet.
5. Watch operation check (Can be operated only while the main
power is off.)
Press [FUNCTION] and [BAND] at the same time.
Press [FUNCTION] and [BAND] at the same time.
→
Watch
starts counting.
Various CD tests
Pressing the two keys at the same time enables the various
adjustment and test as follows in the TEST mode, and “ATT”
segment is flashing.
adjustment and test as follows in the TEST mode, and “ATT”
segment is flashing.
1) Pressing [TUNING–] and [CD EJECT
6] at the same time :
The present normal tracking balance value (“31” to “36”) is
displayed when the above key operation is performed and
(TRBAL.) is displayed.
displayed when the above key operation is performed and
(TRBAL.) is displayed.
The tracking gain is fixed to “3F” (TOG1 to TOG2: all off)
2) Pressing [TUNING–] and [DBFB] at the same time :
(SHUFFLE) is displayed.
• ADJUSTMENT mode
• ADJUSTMENT mode
When the above key operation is performed, the machine
enters the ADJUSTMENT mode. The “SHUFFLE” flashes
on display tube.
enters the ADJUSTMENT mode. The “SHUFFLE” flashes
on display tube.
During the ADJUSTMENT mode:
The CLV gain is not switched to 8 cm. (The CLV gain is
fixed to 12 cm always.)
The machine is ready to enter the AF-ADJUSTMENT mode
as described below.
fixed to 12 cm always.)
The machine is ready to enter the AF-ADJUSTMENT mode
as described below.
3) Pressing [TUNING–] and [FUNCTION] at the same time :
(SHUFFLE) and (PROGRAM) are displayed.
• AF-ADJUSTMENT mode
• AF-ADJUSTMENT mode
After the machine enters the ADJUSTMENT mode by the
key operation as described in step 2), the machine can enter
the AF-ADJUSTMENT mode by pressing the above key
operation. [TUNING – /FUNCTION]
The “SHUFFLE” and “PROGRAM” flash on display.
key operation as described in step 2), the machine can enter
the AF-ADJUSTMENT mode by pressing the above key
operation. [TUNING – /FUNCTION]
The “SHUFFLE” and “PROGRAM” flash on display.
During the AF-ADJUSTMENT mode, the tracking and sled
servos are turned off in addition to the ADJUSTMENT mode.
The machine stops the GFS error check which is normally
performed by software.
servos are turned off in addition to the ADJUSTMENT mode.
The machine stops the GFS error check which is normally
performed by software.
• Sled motor check
When disc is removed by pressing EJECT during the AF-
ADJUSTMENT mode, the sled can be moved to inner
circumference or outer circumference by pressing [TUNING–
] or [TUNING+]. At this time, because the microprocessor
is not sensing the sled position, be careful when moving the
sled not to damage gears and other mechanism.
ADJUSTMENT mode, the sled can be moved to inner
circumference or outer circumference by pressing [TUNING–
] or [TUNING+]. At this time, because the microprocessor
is not sensing the sled position, be careful when moving the
sled not to damage gears and other mechanism.
4) Pressing [TUNING–] and [VOL–] at the same time :
• No CDM mode
[1] is displayed.
When the above key operation is performed, the control on
the slot mechanism which takes in and ejects a CD disc is
stopped.
At this time “1” on the display flashes.
When the above key operation is performed, the control on
the slot mechanism which takes in and ejects a CD disc is
stopped.
At this time “1” on the display flashes.
During the no CDM mode,
The TOC data is deleted by the [CD EJECT
6] key.
(When the TEST mode is cleared and a CD disc is inserted,
machine reads the TOC again.)
machine reads the TOC again.)
SECTION 3
TEST MODE
— 10 —
5) Pressing [TUNING–] and [VOL+] at the same time :
• Aging mode
The machine enters the aging mode by inserting a CD disc
and performing the above button
operation. The display starts counting the aging operation
with COUNT display, and “REPEAT” flashes.
and performing the above button
operation. The display starts counting the aging operation
with COUNT display, and “REPEAT” flashes.
Aging operation
1. Machine takes a disc into the machine.
2. Reads the TOC.
3. Accesses to the last track.
4. Plays back the last 2 seconds.
5. Ejects the disc.
2. Reads the TOC.
3. Accesses to the last track.
4. Plays back the last 2 seconds.
5. Ejects the disc.
The one complete operation from step 1 to step 5 is one count.
The cycle is repeated. However, steps 2 to 4 are skipped in all
modes other than the CD function.
Steps 1 and 5 are skipped in the no CDM mode.
The cycle is repeated. However, steps 2 to 4 are skipped in all
modes other than the CD function.
Steps 1 and 5 are skipped in the no CDM mode.
The aging operation ends when an error occurs.
Aging error display
“Load Error”
Aging error display
“Load Error”
: Loading operation is not completed in four
seconds.
“Eject Error”
: Eject operation is not completed in four
seconds.
“Q TOC Err”
: The Q data could not be read during eight
seconds. (During TOC read)
“Q SRCH Err”
: The Q data could not be read during eight
seconds. (During track search)
“Q PLAY Err”
: The Q data could not be read during eight
seconds. (During PLAY)
“FOK UP Err”
: Focus could not be locked in. (During
setup)
“FOK TOC Err”
: Focus is un-locked many times. (During
TOC read)
“FOK SRCH Err” : Focus is un-locked many times. (During
track search)
“FOK PLAY Err” : Focus is un-locked several times. (During
play)
“GFS UP Err”
: GFS error. (During setup)
“GFS TOC Err”
: GFS error. (During TOC read)
“GFS PLAY Err” : GFS error. (During play)
Display selection during aging
The display can be switched by pressing the [TUNING–] and
[FUNCTION] at the same time :
The display can be switched by pressing the [TUNING–] and
[FUNCTION] at the same time :
Count display
Elapsed time display
Other errors
Normal display
Example of display
" COUNT
723 "
(Machine has repeated for 723 times.)
"
12 : 05 : 35 "
(12 hours 5 minutes 35 seconds have elapsed.)
" TW 2
SW 1 "
** Other troubles
“TW*SW*”
TW : Numbers of times that the machine could not read
TOC.
SW : Numbers of times that the machine could not
complete the track search within 16 seconds.
To exit the aging mode and to return the TEST mode, press
[TUNING – ] and [VOL +] at the same time.
[TUNING – ] and [VOL +] at the same time.
— 11 —
CD SECTION
Note:
1. CD Block is basically constructed to operate without adjustment.
1. CD Block is basically constructed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use the oscilloscope with more than 10M
3. Use the oscilloscope with more than 10M
Ω
impedance.
4. Clean an object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
following checks.
5. When optical pickup is replaced during repair, perform the focus
bias adjustment.
Focus Bias Adjustment
This adjustment is to be done when the optical block is replaced.
Adjustment procedure:
1. Connect oscilloscope to test point TP (VC) and TP (RF) on BD
1. Connect oscilloscope to test point TP (VC) and TP (RF) on BD
board.
2. Turned power switch ON. (Stop state)
3. Insert disc (YEDS-18) and press the
3. Insert disc (YEDS-18) and press the
^ button.
4. Adjust RV101 so that the oscilloscope waveform is as shown in
the figure below (eye pattern).
A good eye pattern means that the diamond shape (≈) in the
center of the waveform can be clearly distinguished.
A good eye pattern means that the diamond shape (≈) in the
center of the waveform can be clearly distinguished.
•
RF signal reference waveform (eye pattern)
When observing the eye pattern, set the oscilloscope for AC
range and raise vertical sensitivity.
range and raise vertical sensitivity.
S-Curve Check
Procedure:
1. Connect as oscilloscope to test point TP (VC) and TP (FEO) on
1. Connect as oscilloscope to test point TP (VC) and TP (FEO) on
BD board.
2. Connect a lead wire between test point TP (FOK) and Ground.
3. Turned Power switch on.
4. Insert disc (YEDS-18) and turned Power switch on again to
3. Turned Power switch on.
4. Insert disc (YEDS-18) and turned Power switch on again to
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
table is moving in and out.)
5. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm that peak to peak level is within
2.4 ± 0.7 Vp-p.
2.4 ± 0.7 Vp-p.
S-curve waveform
+
–
–
BD board
TP (RF)
TP (VC)
oscilloscope
(DC range)
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level:
1.3
1.3
±
0.3Vp-p
+
–
–
BD board
TP (FEO)
TP (VC)
oscilloscope
A
B
symmetry
within 2.4
±
0.7 Vp-p
+
–
–
BD board
TP (RF)
TP (VC)
oscilloscope
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level:
1.3
1.3
±
0.3Vp-p
+
–
–
BD board
TP (TEO)
TP (VC)
oscilloscope
(DC range)
SECTION 4
ELECTRICAL ADJUSTMENTS
6. After check, remove the lead wire connected in step 2.
Note:
Note:
•
Try to measure several times to make sure that the ratio of
A:B or B:A is more than 10:7.
A:B or B:A is more than 10:7.
•
Select a longer sweep time and increase the brightness to
obtain best waveform.
obtain best waveform.
RF Level Check
Procedure:
1. Connect oscilloscope to test point TP (VC) and TP (RF) on BD
1. Connect oscilloscope to test point TP (VC) and TP (RF) on BD
board.
2. Turned Power switch on.
3. Insert the disc (YEDS-18) and press the
3. Insert the disc (YEDS-18) and press the
^ button.
4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct.
Note: Clear RF signal waveform means that the shape “≈” can be
clearly distinguished at the center of the waveform.
RF signal waveform
E-F Balance (Traverse) Check
Procedure:
1. Set up the TEST mode step 3) AF-ADJUSTMENT. (see page
1. Set up the TEST mode step 3) AF-ADJUSTMENT. (see page
9.)
2. Connect as oscilloscope to test point TP (TEO) on BD board.
3. Turned Power switch on.
4. Insert the disc (YEDS-18) in and press the
3. Turned Power switch on.
4. Insert the disc (YEDS-18) in and press the
^ button.
5. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0V dc, and check the amplitude.
— 12 —
Focus/Tracking Gain Adjustment
This gain has a margin, so even if it is slightly off. There is no
problem.
Therefore, do not perform, RV102 and RV103 adjustment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
problem.
Therefore, do not perform, RV102 and RV103 adjustment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
Adjustment Location:
[BD BOARD] — Component side —
A
B
0 V
specified value:
amplitude: 300
±
100 mVp-p
×
100 = less than
±
7%
A-B
2 (A+B)
•
•
•
A+B = 300
±
100 mVp-p
Traverse waveform
symmetry
(VC)
(RF)
(PCK)
IC102
IC104
(FOK)
(A.GND)
(D.GND)
(TEO)
(TEI)
RV101
RV102
RV103
(FEI)
(TAO)
(FEO)
Click on the first or last page to see other CMT-101 / HCD-101 / TC-TX101 service manuals if exist.