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Model
HCD-TB10
Pages
55
Size
3.78 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-tb10.pdf
Date

Sony HCD-TB10 Service Manual ▷ View online

16
HCD-TB10
SECTION 4
TEST MODE
[Change-over of AM Tuner Step between 9 kHz and 10 kHz]
• A step of AM channels can be changed over between 9 kHz and
10 kHz. (EXCEPT AEP, UK model)
Procedure:
1.
Press the  ?/1  button to turn the set on.
2.
Select the function “TUNER”, and press the  ENTER  button
to select the band “AM”.
3.
Press the  ?/1  button to turn the set off.
4.
Press two buttons  ENTER  and  ?/1  simultaneously, and the
LCD changes to “AM 9 k STEP” or “AM 10 k STEP”, and
thus the channel step is changed over.
[CD Ship Mode ]
• This mode moves the pickup to the position durable to vibra-
tion. Use this mode when returning the set to the customer after
repair.
Procedure:
1.
Press the  ?/1  button to turn the set on.
2.
Press the NX button and the  ?/1  button simultaneously.
3.
The “STANDBY” display blinks instantaneously, then “LOCK”
is displayed and the CD ship mode is set.
[CD Lock Mode ]
• This mode locks the tray and a CD in the set even after power-
off.
Procedure:
1.
Press the  ?/1  button to turn the set on.
2.
Set a CD in the set.
3.
Press two buttons  x  and  Z  simultaneously for five seconds.
4.
The message “LOCKED” is displayed and the tray is locked.
5.
After the power-off, the tray is still locked.
6.
To unlock the tray , press two buttons  x  and  Z  simultaneously
for five seconds.
7.
The message “UNLOCKED” is displayed and the tray is
unlocked.
[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  x  ,  ENTER  and  ?/1  simultaneously.
2. The LCD displays “C RESET” and the set is reset.
[Version and Destination Display Mode]
• The version or destination is displayed.
Procedure:
1.
Turn the set off.
2.
To enter the test mode, press three buttons  DIMMER  ,  x
and  ENTER  simultaneously.
3.
The model and the destination is displayed.
4.
Press the  DISPLAY  button.
5.
The version is displayed.
6.
Press the  DISPLAY  button again.
7.
The date of this version is displayed.
8.
To exit from this mode, press three buttons  DIMMER  ,  x
and  ENTER  simultaneously.
[Panel Test  Mode]
• All LCD segments and LEDs are tested.
• Keyboard check.
Procedure:
1.
Press the  ?/1  button to turn the set on.
2.
To enter the test mode, press three buttons  DISPLAY ,  x  and
ENTER  simultaneously.
3.
All segments and LEDs are turned on.
4.
Press the  DISPLAY  and  FUNCTION  buttons simultaneously,
and the key number check mode is activated.
5.
The message “KEY0 0 0” is displayed.
Each time a button is pressed, the key code number is displayed.
6.
Press the  DISPLAY  and  FUNCTION  buttons simultaneously,
and the key count mode is activated.
7.
The message “CNT 0 1” is displayed.
Each time a button is pressed, “CNT 0 1” value increased.
However, once a button is pressed, it is no longer taken into
account.
8.
Press the  DISPLAY  and  FUNCTION  buttons simultaneously,
and the volume control detect mode is activated.
9.
The message “VOL FLAT” is displayed.
“VOL UP” is displayed if rotating  VOL  knob upward, or “VOL
DOWN” is displayed if rotating dowanward.
10. Press the  DISPLAY  and  FUNCTION  buttons simultaneously,
and the headphone detect mode is activated.
11. The message “HP OFF” is displayed when a headphone jack
is not inserted.
“HP ON ” is displayed when a headphone jack is inserted.
12. To exit from the panel test mode after the headphone detect
mode, press three buttons  DISPLAY ,  x    and  ENTER
simultaneously.
[MC Test  Mode]
• This mode is used to test the function of the equalizer.
Procedure:
1.
Press the  ?/1  button to turn the set on.
2.
To enter the test mode, press three buttons  REC PAUSE/START  ,
 x  and  ENTER  simultaneously.
3.
Rotate the  VOL  knob upward.
The volume is set to “VOL MAX”.
4.
Rotate the  VOL  knob downward.
The volume is set to “VOL MIN”.
5.
Press the  MUSIC MENU  button.
The function of the equalizer is set to “GEQ FLAT”.
4.
Press the  BASS  button.
The function of the equalizer is set to “GEQ MIN”.
5.
Press the  TREBLE  button.
The function of the equalizer is set to “GEQ MAX”.
6.
To exit from this mode, press the  ?/1  button.
The LCD displayed “C RESET”, then the set is reset and turned
off.
[CD Service Mode]
• This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pickup.
Procedure:
1.
Press the  ?/1  button to turn the set on.
2.
Select the function “CD”.
3.
To enter the test mode, press three buttons  CD SYNC  ,  x
and  ENTER  simultaneously.
4.
The message “CD S” is displayed and the CD service mode is
selected.
5.
With the CD in stop status, press the  +/M  button to move
the pickup to outside track and “CD S  –F” is displayed, or
press the  –/m    button to inside track and “CD S  –R” is
displayed.
6.
To exit from this mode, press the  ?/1  button.
The pick up moves to most inside track and the power is turned
off.
17
HCD-TB10
SECTION 5
ELECTRICAL ADJUSTMENTS
FM Tuned Level Adjustment
Procedure:
1.
Supply a 98 MHz signal at 28 dB from the ANTENNA terminal.
2.
Tune the set to 98 MHz.
3.
Adjust SFR101 to the point (moment) when the TUNED
indicator will change from going off to going on.
Adjustment Location: MAIN board
Null Adjustment
Procedure:
1.
Supply a 98 MHz signal at 60 dB from the ANTENNA terminal.
2.
Tune the set to 98 MHz.
3.
Measure voltage between pin 22 and pin 3 of IC 101.  Adjust
T101 until the voltage becomes 0 V.
Adjustment Location: MAIN board
FM RF Signal generator
75 
 coaxial
Carrier frequency : 98 MHz
Modulation           : AUDIO 1 kHz, 75 kHz
                              deviation (100%)
Output level          : 30 dB  (at 75 
 open)
FM ANTENNA terminal
(JK101)
set
FM RF Signal generator
75 
 coaxial
Carrier frequency : 98 MHz
Modulation           : AUDIO 1 kHz, 75 kHz
                              deviation (100%)
Output level          : 60 dB  (at 75 
 open)
FM ANTENNA terminal
(JK101)
set
AM RF Signal generator
30% amplitude
modulation by
400Hz signal
output level : as low as possible
AM ANTENNA terminal
(JK101)
set
AM IF Adjustment
TUNER SECTION
Procedure:
1.
Set the frequency of the AM RF signal generator to 1000 kHz
(at 10 kHz step) or 999 kHz (at 9 kHz step).
2.
Tune the set to AM 1000 kHz (at 10 kHz step) or 999 kHz (at 9
kHz step).
3.
Adjust IFT101 so that the reading on level meter becomes in
maximum.
Adjustment Location: MAIN board
headphones jack (JK302)
level meter
set
16 
T101: NULL
IC101
IFT101: AM IF
SFR101: 
FM TUNED LEVEL
[MAIN BOARD]   Component side
18
HCD-TB10
CN731
TP731:
TP connected to pin 
q;
 (IC751)
IC751
CN733
IC731
Adjustment Location: CDM board
[CDM BOARD] (Component Side)
CD SECTION
RF Level Check
Procedure :
1. Connect oscilloscope to pin q; (IC751).
2. Turn the set on.
3. Load a disc (YEDS-18) and play the number five track.
4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
IC751 pin q; 
GND
CDM board
oscilloscope
Note : Clear RF signal waveform means that the shape “ 
◊ ” can be clearly
distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.4 to 2.1 Vp-p
Note :
1. CD Block is basically designed 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 an oscilloscope with more than 10M
Ω impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
19
HCD-TB10
SECTION 6
DIAGRAMS
6-1. Circuit Boards Location
MAIN board 
PANEL board
LCD board
BACK LIGHT board
H/P board
VOL board
SUB TRANSFORMER board 
P-AMP board 
CDM board 
POWER TRANSFORMER board
MOTOR (TRAY) board
MOTOR board
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