Sony CMT-BX70DBI / HCD-BX70DBI Service Manual ▷ View online
HCD-BX70DBi
13
3-14. BELT
belt
claw
claw
tray (AU)
belt
position of belt
3-15. OP BASE ASSY (KSM-213D)
Remove four solders.
flexible flat cable (16 core)
(CN301)
(CN301)
CD board
op base assy
(KSM-213D)
(KSM-213D)
HCD-BX70DBi
14
SECTION 4
TEST MODE
COLD RESET
The cold reset clears all data including preset data stored in the
RAM to initial conditions. Execute this mode when returning the
set to the customer.
Procedure:
1. Press three buttons of [
The cold reset clears all data including preset data stored in the
RAM to initial conditions. Execute this mode when returning the
set to the customer.
Procedure:
1. Press three buttons of [
x
/CANCEL], [VOL +] and [
?
/
1
] si-
multaneously.
2. The system is reset and becomes standby states.
COMMON TEST MODE
This mode is used to check operations of amplifi er.
Procedure:
1. Press the [
This mode is used to check operations of amplifi er.
Procedure:
1. Press the [
?
/
1
] button to turn the power on.
2. Press three buttons of [TUNER/BAND], [
x
/CANCEL] and
[ENTER] simultaneously.
3. When the COMMON test mode is activated, “AUDIO IN” is
displayed on the liquid crystal display and “cPLAY SLEEP”
blink on the fl uorescent indicator tube.
blink on the fl uorescent indicator tube.
4. Each time [EQ] button on the remote commander is pressed,
the display changes starting “TONE MAX”, “TONE MIN”
and “TONE FLAT” this order.
and “TONE FLAT” this order.
5. Press the [VOL –] button, “VOLUME MIN” is displayed
on the fl uorescent indicator tube. Press the [VOL +] button,
“VOLUME MAX” is displayed on the fl uorescent indicator
tube.
“VOLUME MAX” is displayed on the fl uorescent indicator
tube.
6. To release this mode, press the [
?
/
1
] button.
PANEL TEST MODE
This mode is used to check the liquid crystal display, LED, model,
destination, software version and key.
Procedure:
1. Press the [
This mode is used to check the liquid crystal display, LED, model,
destination, software version and key.
Procedure:
1. Press the [
?
/
1
] button to turn the power on.
2. Press three buttons of [TUNER/BAND], [DSGX] and [EN-
TER] simultaneously.
3. All segments on the fl uorescent indicator tube, [STANDBY]
LED light up.
4. Press the [ENTER] button, the model and destination are alter-
nately displayed on the fl uorescent indicator tube.
5. Press the [ENTER] button again, MC version is displayed on
the fl uorescent indicator tube.
6. Each time [ENTER] button is pressed, the display changes
starting from MC version, GC version, CLA version, CD ver-
sion, CDD version, CDMA version, CDMB version, BDA ver-
sion, BDB version, ST version, TA version and TM version
this order, and returns to the MC version display.
sion, CDD version, CDMA version, CDMB version, BDA ver-
sion, BDB version, ST version, TA version and TM version
this order, and returns to the MC version display.
7. When [
x
/CANCEL] button is pressed while the MC version
is displayed, year, month and day of the software creation is
displayed. When [
displayed. When [
x
/CANCEL] button is pressed again, the
display returns to the MC version display.
8. Press the [DSGX] button, the key test mode is activated and
“K 0” is displayed on the fl uorescent indicator tube.
9. Each time a button is pressed, “K” value increases. However,
once a button is pressed, it is no longer taken into account.
All keys are pressed, display becomes “K19”.
10. Press the [VOL +] button, the key AD monitor mode is acti-
vated and “FFFFFF” is displayed on the fl uorescent indicator
tube.
tube.
11. Each time a button is pressed, the AD of each button is dis-
played on the fl uorescent indicator tube.
12. To release this mode, press three buttons in the same manner as
step 2, or disconnect the power cord.
CD SHIP MODE
This mode moves the optical pick-up to the position durable to
vibration. Use this mode when returning the set to the customer
after repair.
Procedure:
1. Press the [
This mode moves the optical pick-up to the position durable to
vibration. Use this mode when returning the set to the customer
after repair.
Procedure:
1. Press the [
?
/
1
] button to turn the power on.
2. Press the [FUNCTION] button to select “CD”.
3. Press three buttons of [DSGX], [VOL +] and [
3. Press three buttons of [DSGX], [VOL +] and [
A
] simultane-
ously.
4. After the “STANDBY” display blinks, “LOCK” is displayed
on the fl uorescent indicator tube, the ship mode is set.
CD SHIP MODE & MEMORY CLEAR
This mode is used to perform CD ship mode and cold reset simul-
taneously.
Procedure:
1. Press the [
This mode is used to perform CD ship mode and cold reset simul-
taneously.
Procedure:
1. Press the [
?
/
1
] button to turn the power on.
2. Press three buttons of [
x
/CANCEL], [VOL +] and [
A
] simul-
taneously.
3. After the “STANDBY” display blinks, “LOCK” is displayed
on the fl uorescent indicator tube the ship mode is set and the
system is reset.
system is reset.
ANTITHEFT LOCK MODE
This mode is used to unable to take sample disc out of disc tray in
the shop.
Procedure:
1. Press the [
This mode is used to unable to take sample disc out of disc tray in
the shop.
Procedure:
1. Press the [
?
/
1
] button to turn the set on.
2. Press the [
A
] button to open the disc tray and set the CD disc.
3. Press the [
A
] button to close the disc tray.
4. Press the [FUNCTION] button to select “CD”.
5. Press two buttons of [
5. Press two buttons of [
x
/CANCEL] and [
A
] for 5 seconds.
6. The message “LOCKED” is displayed on the fl uorescent indi-
cator tube and the disc tray is locked. (Even if pressing the Z
button, the message “LOCKED” is displayed on the fl uores-
cent indicator tube and the disc tray is locked)
button, the message “LOCKED” is displayed on the fl uores-
cent indicator tube and the disc tray is locked)
7. To release from this mode, press two buttons of [
x
/CANCEL]
and [
A
] for 5 seconds.
8. The message “UNLOCKED” is displayed on the fl uorescent
indicator tube and the disc tray is unlocked.
CD POWER MANAGE
This mode is used to changed over CD power on/off for decreasing
of reception noise in the tuner mode.
Procedure:
1. Press the [
This mode is used to changed over CD power on/off for decreasing
of reception noise in the tuner mode.
Procedure:
1. Press the [
?
/
1
] button to turn the power on.
2. Press the [FUNCTION] button to select “CD”.
3. Press the [
3. Press the [
?
/
1
] button again to turn the power off.
4. Press two buttons of [
x
/CANCEL] and [
?
/
1
] simultaneously.
5. The message “CD POWER”, “ON” or “CD POWER”, “OFF”is
displayed on the fl uorescent indicator tube, and CD power on/
off is changed over in the tuner mode.
off is changed over in the tuner mode.
HCD-BX70DBi
15
CD SERVICE MODE
This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the optical pick-up.
Procedure:
1. Press the [
This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the optical pick-up.
Procedure:
1. Press the [
?
/
1
] button to turn the power on.
2. Press the [FUNCTION] button to select “CD”.
3. Press three buttons of [
3. Press three buttons of [
x
/CANCEL], [VOL –] and [
A
] simul-
taneously, the message “SERVICE MO” is displayed on the
fl uorescent indicator tube.
fl uorescent indicator tube.
4. Press the [
l
m
TUNE –] button to move the optical pick-
up to inside track and the message “SLED IN” is displayed on
the fl uorescent indicator tube, or press the [
the fl uorescent indicator tube, or press the [
M
L
TUNE
+] button to outside track and the message “SLED OUT” is
displayed on the fl uorescent indicator tube.
displayed on the fl uorescent indicator tube.
5. Press the [CD
u
] button, “LD ON” or “LD OFF” is displayed
on the fl uorescent indicator tube. Each time [CD
u
] button is
pressed, laser diode on/off is changed over.
6. To release this mode, press the [
?
/
1
] button.
HCD-BX70DBi
16
SECTION 5
ELECTRICAL CHECKS
FM TUNE LEVEL CHECK
Procedure:
1. Turn on the set.
2. Input the following signal from signal generator to FM antenna
1. Turn on the set.
2. Input the following signal from signal generator to FM antenna
input directly.
Carrier frequency : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation
Deviation
: 75 kHz
Modulation
: 1 kHz
ANT input
: 35 dBu (EMF)
Note: Use 75 ohm coaxial cable to connect signal generator and the set.
You cannot use video cable for checking.
Use signal generator whose output impedance is 75 ohm.
3. Set to FM tuner function and tune A, B and C signals.
4. Confi rm “TUNED” is lit on the display for A, B and C sig-
4. Confi rm “TUNED” is lit on the display for A, B and C sig-
nals.
When the selected station signal is received in good condition,
“TUNED” is displayed.
“TUNED” is displayed.
Note:
1. CD Block is basically constructed to operate without adjustment.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10 M
1. CD Block is basically constructed to operate without adjustment.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10 M
Ω impedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specifi ed value with the following checks.
5. Check the focus bias check when optical pick-up block is replaced.
FOCUS BIAS CHECK
Procedure:
1. Connect oscilloscope to TP121 (RFI) and TP124 (VC) on the
1. Connect oscilloscope to TP121 (RFI) and TP124 (VC) on the
CD board.
2. Press the [
?
/
1
] button to turn the power on.
3. Set disc (YEDS-18) on the disc tray and press the [CD
u
]
button to playback.
4. Confi rm that oscilloscope waveform is as shown in the fi gure
below. (eye pattern)
A good eye pattern means that the diamond shape (
◊) in the
center of the waveform can be clearly distinguished.
Checking Location:
TUNER SECTION
CD SECTION
signal
generator
set
+
–
–
CD board
TP121 (RFI)
TP124 (VC)
oscilloscope
(DC range)
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
1.2 ± 0.3 Vp-p
TP124
(VC)
– CD Board (Conductor Side) –
TP121
(RFI)
IC101
Click on the first or last page to see other CMT-BX70DBI / HCD-BX70DBI service manuals if exist.