SONY ICDST20
Service Manual

ICD-ST10/ST20 SECTION 3 TEST MODE
[Setting Method of the Test Mode] To enter the test mode, turn on the HOLD . switch while pressing the x key and VOL+ key at the same time with the power on. [Operation in the Test Mode] After entering the test mode, you can move within the test menu by pressing the . / > key. You can move to the submenu by pressing the x�B key. Then each test mode can be executed. 1. LCD test � LCD is tested of all light-on and all light-off.
xB
ALL

[Exiting Method of the Test Mode] Exit the test mode by turning off the power. [Initial Status of the Test Mode] When the test mode is set, the LCD display appears as shown below. LCD display (Example)

. > (select), x B (set)
LCD

LCD

x

:
OFF LCD CHK LCD ALL LCD

(LCD off)
CHK
ABCDE mM L
H

:

START

STSPLP

AB

5A 102
01
ST20

Iris(DSP) version : 5A SakuraR(CPU) version : 1.02 (In α version or β version, A or B is displayed) LPEC ST version : 01 Model code : ST20

� � �

88 REC 888
YM MM DS

.>
CHK

888888
END

5A102 01ST20

x

x

x

[Flow Chart of the Test Mode]

START TEST MODE

2. Audio test Perform the through-playback and sine wave output. � Contents of the submenu DSP ST: DSP STEREO through mode DSP MO: DSP MONO through mode SIN: 1 kHz sine wave output mode � Select the microphone sensitivity with the A-B switch. HtMtLtHtMt ... � The VOR detection operation can be checked by the LED. Sound: The red LED is turned on. No sound: The red LED is turned off.
RST

. > . LCD . AU IO . SLEEP . BEEP . RTC . > > KEY .
Turn off the power (Extract the batteries or DC jack)
Initial status of test mode Model code, LPEC ST, F/W version display

> MENU > > .
KEY

COUNT > > . USB . LED . BATT

>

>

>

>

� MUTE can be set to �ON� or �OFF� with the ERASE key. � The sound volume can be adjusted with the VOL+ key or VOL- key during the audio test except the MUTE mode. � In the directional microphone selection, ON/OFF of the DIRECTNL switch is performed with the DIVIDE key. DIRECTNL switch ON : The green LED is turned on. OFF : The green LED is turned off. � In the audio test mode the operation is performed according to JACK detection. � The microphone sensitivity, sound volume and MUTE (on/off) are displayed on the LCD. � The microphone sensitivity selection and the VOR test are effective in the through-playback mode. � The directional microphone selection is effective in the DSP MONO through mode.
DSP STEREO through mode / MIC : M / MUTE : ON / VOL-LEVEL : 12 t "M / on / 12 / DSP ST" DSP MONO through mode / MIC : H / MUTE : OFF / VOL-LEVEL : 23 t "H / oF / 23 / DSP MO" 1k sine wave output mode / MUTE : ON / VOL-LEVEL : 06 t "on / 06 / SIN"

END TEST MODE

xB
AU IO

. > (select), x B (set)
DSP ST

x

:
DSP MO SIN DSP ST
H

mM

m

:

on 12 DSP ST

oF 23 DSP MO

on 06 SIN

x

x

x

8