ICD-SX20, ICD-SX30, ICD-SX40 - Sony Audio Service Manual (repair manual). Page 10

10

• Pressing the x

•

B key causes the set to enter the sleep state.

• When the  HOLD .    switch is ON, the LCD is turned off.

When OFF, the LCD is turned on.

• Press any keys to exit the sleep state.

• Beep sound of 1.3 kHz or 2 kHz is output.

• Perform the function test of the RTC and EEPROM.
(1) RTC EEPROM test

Confirmation of writing, reading (verifying) and erasing of
arbitrary data with the specified registers.

(2) RTC clock function test

Confirmation that RTC updates the time to the microcomputer
at one second interval.

•   OK, NG judgement is performed to the test result.

When NG, it is displayed which device RTC or EEPROM
becomes NG.

(All OK : "RTC OK" / RTC NG : "RTC BAD" / EEPROM NG
: "EEP BAD")

• When the any key is pressed, the entry key and the A/D converted

value (hexadecimal) of the two channel keys are displayed.

• When the  x  key is pressed, the A/D value of the key is displayed

while the key is depressed. When the key is released, the screen
returns to the test menu.

• The detected A/D value (hexadecimal) of the battery remaining

power is displayed. When DC jack is inserted, the battery mark
on the LCD is turned off.

• LEDs (OPR: red and green) are all turned on.

• When the menu starts the USB self-check, either presence or

absence of the Vbus is judged.
(Vbus is present: “ON VBUS”, Vbus is absent: “OFF VBUS”)

• The USB driver always works regardless of presence or absence

of the USB signal only when Vbus is available during the USB
test. At this time, turning on  HOLD .  causes the set to move
to the suspend state. Turning off the Vbus causes the set to return
to the test menu.

• In the menumode if the Vbus is supplied, any key will not work.

Therefore the Vbus will be supplied after surely pressing the  x

•

B

key.

• Pressing the  x

•

B  key makes the count to "------" and sets test

standby status.
Once more pressing the  x

•

B  key makes the count to "000000"

and sets the key durable test.
In this mode any key input and slide switch operation are counted
and the number is displayed.
Turn off the power to exit this mode.

• Pressing the  x

•

B    key causes the set to enter the menu

initialization standby state.

• When the following keys are all entered, the EEPROM

initialization (returning setting in the menu and user name to
default value) and formatting process (deleting all message files
in the flash memory) are executed. At the same time, the WakeUp
signal is checked, too.

Check keys: VOL- ,  VOL+ ,  A-B 

 ,  ERASE ,

DIVIDE ,  DPC ON ,  DPC OFF ,  . ,
x•B ,  > ,  FOLDER ,  MENU ,  x ,

z REC ,  HOLD . ON ,  HOLD .

OFF ,  DIRECTNL ON, and DIRECTNL
OFF ,  VOICE UP  ON, and  VOICE UP
OFF

any keys

any keys

(LCD OFF)

(with HOLD 

.

OFF status)

x

•

B

(with HOLD 

.

ON status)

x

•

B

SLEEP SOON

SLEEP IN 

SLEEP  

x

•

B

BEEP 2.0K

BEEP 1.3K

:

:

BEEP1.3K

on BEEP1.3K

on BEEP 2.0K

BEEP  

x

x

x

.

>

(select),

(set)

x

•

B

x

•

B

RTC  

RTC OK

x

bATT FF

bATT C2

x

•

B

DC jack

is inserted

DC jack

is extracted

B A T T

bATT FF

x

x

•

B

LED ON

LED   

x

LED ON (orange)

LED OFF

x

•

B

ON 

cut Vbus

Vbus

on

cut Vbus

Suspend 
mode

HOLD 

.

SUSPEND

VBUS ON

VBUS OFF

USB  

x

x

•

B

x

•

B

any keys or slide

switches operation

KEY 000001

KEY 000000

KEY-----

KEY COUNT

x

Key durable

test

x

•

B

KEY oFFiFF

KEY   

x