Service Mode - Sony HCD-MD1EX - System Service Manual

Change-over of AM (MW) Tuner Step between 9 kHz and 10 kHz
• A step of AM (MW) channels can be changed over between 9 kHz and 10 kHz.
Procedure:
1. Press 1/u button to turn the set ON.
2. Select the function "TUNER", and press
3. Press 1/u button to turn the set OFF.
[FUNCTION]
and 1/u buttons simultaneously, and the display of fluorescent indicator tube changes to "AM (MW) 9 kHz
4. Press
STEP" or "AM (MW) 10 kHz STEP", and thus the channel step is changed over.
Change-over of LW Tuner Step between 1 kHz and 3 kHz
• A step of LW channels can be changed over between 1 kHz and 3 kHz.
Procedure:
1. Press 1/u button to turn the set ON.
2. Select the function "TUNER", and press
3. Press 1/u button to turn the set OFF.
[FUNCTION]
and 1/u buttons simultaneously, and the display of fluorescent indicator tube changes to "LW 1 kHz STEP" or
4. Press
"LW 3 kHz STEP", and thus the channel step is changed over.
ATT Change-over of TAPE input
Procedure:
1. Press 1/u button to turn the set ON.
2. Select the function "TAPE".
3. Press 1/u button to turn the set OFF.
4. Press 1/u button while pressing
to "Attenuator ON" or "Attenuator OFF", then ATT change-over of TAPE input is completed.
CD tracking balance display
Procedure:
1. Press 1/u button to turn the set ON.
2. Select the function "CD".
[TUNER/BAND]
button while pressing p (CD) button.
3. Press
4. The display of fluorescent indicator tube shows you the following message.
CD TR. BAL. ππ
LED and Fluorescent Indicator Tube All Lit, Key Check Mode
Procedure:
[VOLUME–]
1. Press two buttons
2. LEDs and fluorescent indicator tube are all turned on.
[FUNCTION]
3. When the button is pressed, the fluorescent indicator tube lights up in the order of; partial lighting 1 n partial lighting
2 n all lit n partial lighting 1 n.
[VOLUME+/–]
When the
To end without switching to the key check mode, press the 1/u button to turn off the power.
4. Press p (CD) button, and the key check mode is activated.
5. In the key check mode, the fluorescent indicator tube displays "KEY=0 JOG=0". Each time a button is pressed, "KEY=" value
increases. However, once a button is pressed, it is no longer taken into account.
"JOG=" Value increases like 1, 2, 3 ... if press
6. To exit from this mode, press order all buttons (13 buttons), and press any button, or disconnect the power cord.
SUB CLOCK CHECK
Procedure:
1. Connect an oscilloscope to IC707 pin (¡ and ground of the MAIN board.
[VOLUME–]
2. Press two buttons
3. To check the signal on oscilloscope becomes 32 kHz square wave.
4. Press 1/u button to exit.
SECTION 4

SERVICE MODE

[TUNER/BAND]
[TUNER/BAND]
[FUNCTION]
button. The power is turned on and the display of fluorescent indicator tube changes
[TUNER/BAND]
and simultaneously.
button is pressed, the LED lighting pattern changes.
[VOLUME+]
[REC]
and simultaneously, and the fluorescent indicator tube displays "32.768 kHz (91)".
button to select the BAND "AM (MW)".
button to select the BAND "LW".
button, or it decreases like 99, 98, 97 ... if press
– 19 –
[VOLUME–]
button.