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9

To enter the test mode, turn on the  HOLD 

.  switch while press-

ing the  x  key and   VOL+   key at the same time with the power
on.

Exit the test mode by turning off the power.

When the test mode is set, the LCD display appears as shown below.

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.

•

LCD is tested of all light-on and all light-off.

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.

   H

tLtHtLtHt ...

•

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.

•

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.

Iris(DSP) version : 69

SakuraR(CPU) version : 1.01

LPEC ST version : 01

Model code : ST25

69
101
01
ST25

101

01ST25

69

START

TEST MODE

Initial status of test mode

Model code, LPEC ST,

F/W version display

TEST MODE

>

.

.

.

>

>

.

END

>

LCD

AU IO 

SLEEP

BEEP

RTC

RST

MENU

KEY

COUNT

USB

LED

BATT

KEY

>

>

>

>

.

.

.

.

>

>

>

>

.

.

.

.

Turn off the power
(Extract the batteries or DC jack)

.

>

.

>

OFF LCD

CHK LCD

ALL LCD

:

:

LCD

ALL

LCD

CHK

START

CHK

END

C

B

A

REC

D E

STSPLP

H

M

L

YM

88

888

888888

MM

DS

m

★

★

★

(select),

(set)

(LCD off)

x

x

x

x

x B

x B

DSP STEREO through mode / MIC : L / MUTE : ON / VOL-LEVEL : 12 

t 

"L / 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"

:

:

DSP MO

SIN
DSP ST

AU IO 

DSP ST

23

DSP MO

oF

H

m

12

DSP ST

on

L

m

06

SIN 

on

.

>

(select),

(set)

x

x

x

x

x B

x B

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 con-
verted value (hexadecimal) of the three channel keys are dis-
played.

•

When the  x  key is pressed, the A/D value of the key is dis-
played 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, BL: 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 causes the set to enter the menu ini-

tialization 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,  VOICE UP  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

FF

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

11

•

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.

KEY

COUNT 

KEY

------

KEY

000000

KEY

000001

x

Key durable
test

any keys or slide 
switches operation

x B

x B

12

Note on Schematic Diagrams:
• All capacitors are in 

µ

F unless otherwise noted. (p: pF) 50 WV or

less are not indicated except for electrolytics and tantalums.

• All resistors are in 

Ω

 and 

1

/

4

 

W or less unless otherwise specified.

•      

 

f

: internal component.

•

C

: panel designation.

•

: B+ Line.

• Power voltage is dc 3 V and fed with regulated dc power supply

from DC IN jack (J5001).

• Voltages and waveforms are dc with respect to ground under no-

signal (detuned) conditions.
no mark : PB
[           ] : REC

*

: Impossible to measure

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal production toler-
ances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal production toler-
ances.

• Circled numbers refer to waveforms.

• Signal path.

F

: PB

L

: REC

✩

Replacement of  IC6001 used in this set requires a special tool.

• The voltage and waveform of CSP (chip size package) cannot be

measured, because its lead layout is different from that of conven-
tional IC.

Note on Printed Wiring Boards:
•  

Y

: parts extracted from the conductor side.

•  

: Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

Caution:
Pattern face side: Parts on the pattern face side seen from
(SIDE B)

the pattern face are indicated.

Parts face side:

Parts on the parts face side seen from

(SIDE A)

the parts face are indicated.

•

• MAIN board is multi-layer printed board. However, the patterns of

intermediate-layer have not been included in the diagram.

✩

Replacement of IC6001 used in this set requires a special tool.

• Lead layouts

surface

Lead layout of

conventional IC

CSP (chip size package)