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9

1

button (RS)

2

knob (hold)

4

two sheets

      (hold)

5

two sheets

      (DPC)

6

guard

3

knob (DPC)

10

To enter the test mode, turn ON the 

 > HOLD  switch and while

pressing the  STOP  key and the  VOL–  key at the same time, power
on (set a dry battery).

Remove the battery to exit the test mode.

When the unit enters the test mode, the [Model and version number]
screen is displayed on LCD.

U70  VER.1.60

System controller version (example of version 1.60)

Model information (example for ICD-U70)

1SHUF

LSP HQ

V O R H L

U70  VER.1.60

LCD

BATTERY

MEMORY INIT

INITIALIZE

INIT OK

INIT NG

BATTERY 1.500V

LCD ALL

LCD OFF

1. [Model and version number] screen (when entering the test mode)

2. [LCD] display screen 

Function select screen

Function select screen

.

>

.

>

.

>

STOP

u

All elements of LCD are turned ON.

All elements of LCD are turned OFF.

Screen display during operation

Screen display during operation

3. [BATTERY] (Battery voltage check) screen 

STOP

u

STOP

u

STOP

u

Resultant screen

Battery voltage

.

>

4. [MEMORY INIT] (Flash memory initialize) screen

u

Screen display during operation

Resultant screen

Resultant screen

Formatting and initialization have ended 
with success.

Formatting and initialization have ended
with failure.

STOP

STOP

.

>

11

1. This screen appears when the unit enters the test mode. This

screen shows the model name and the system controller version
number.

2. Press the  >  key to move to the next item (LCD display

check).

1. Press the  NX ,  STOP  ,  . ,  >  key to turn ON or

OFF of all elements of the LCD.

2. Press the  >  key to move to the next item (Battery voltage

check) from the [LCD] display screen, or press the  .  key
to return to the previous item [Model and version number]
screen.

1. Press the  NX  key on the [BATTERY] screen to check the

battery output voltage to the system controller, and the resultant
voltage is displayed. Press the  STOP  key to return to the
[BATTERY] screen.

2. Press the  >  key on the [BATTERY] screen to move to the

next item [MEMORY INIT] or press the  .  key to return
to the previous item [LCD] display screen.

1. Press the  NX  key on the [MEMORY INIT] screen to start

formatting and initialization of the NAND flash memory. When
formatting and initialization of the NAND flash memory are
started, all menu items (including watch setting) of the MENU
information are initialized, and ALL ERASE of all folders are
executed.
When formatting and initialization have ended with success,
[INT OK] is displayed. When formatting and initialization have
ended with failure, [INT NG] is displayed.
Press the  STOP  key to return to the [MEMORY INIT] screen.

2. Press the  >  key on the [MEMORY INIT] screen to return

to the initial screen of [Model and version number]. Press the
>  key to return to the previous item [BATTERY] display
screen.

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 tolerance.

•

C

: panel designation.

•

A

: B+ Line.

• Power voltage is dc 1.5V and fed with regulated dc power supply

from battery terminal.

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

signal (detuned) conditions.
no mark : PLAY
[           ]

  

: 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

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.