ICD-ST30 - Sony Audio Service Manual (repair manual). Page 9

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3. Sleep test
• 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.

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

5. RTC test
• 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")

6. Key entry test
• 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.

7. Battery remaining power and DC IN test
• 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.

8. LED test
• LEDs (OPR: red and green, BL: green) are all turned on.

9. USB test
• 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.

10. Menu reset
• 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

• If all tests end in success, “-ALLOK-” is displayed. If initialization

in the EEPROM is NG, “INIT. NG” appears.

• Turn off the power to exit the test mode.

SLEEP

SOON  

 

IN

SLEEP 

(with HOLD

.

 

OFF status) 

(with HOLD

.

 

ON status) 

(LCD OFF)

any keys

any keys

x B

x B

2.0K

1.3K

:

:

BEEP

1.3K 

1.3K 

2.0K 

.

>

(select),

(set)

x

x

x

x B

x B

OK

RTC

RTC

x

x B

oFF

KEYiFF

KEY

x

x B

FF

BATT

BATT

BATT

BATT

DC jack
is inserted

DC jack
is extracted

x

x B

ON

LED

LED

x

x B

USB

OFF

VBUS

ON

VBUS

PC

LINK

 HOLD

.

 

ON 

x

Suspend
mode

cut Vbus

cut Vbus

Vbus

on

x B

RST

MENU

KEY

PUSH

INIT

OK

ALL

x

All keys
are entered

In the case that 
the initialization
and reset operation 
end correctly.

(blinking)

x B