Sony NWZ-X1051 用户手册

PARTS  RELATED  TO  SWITCH
In this set, only a part of parts that relate to the switch are supplied. 
Exchange the entire mounted board when parts that do not corre-
spond to it are defective.
The right and wrong of the switch can be judged by the following 
two methods.

1.  Judgment From The Test Mode
Judge the right and wrong of the switch referring to “4-4-2. Key 
check” (page 22).

2.  Judgment from the voltage measurement
Judge the right and wrong of the switch by the voltage measure-
ment with a test point.

u

>

.

When the voltage value is below, [u]/[>]/[.] keys are 
normal.
• [u] key is pressed 

: 0 to 0.25 V

• [>] key is pressed 

: 0.4 to 0.6 V

• [.] key is pressed 

: 0.76 to 0.95 V

When the voltage value is below, [VOL +]/[VOL –]/[HOME] keys 
are normal.
• 

[VOL –] key is pressed  : 0 to 0.25 V

• 

[VOL +] key is pressed  : 0.4 to 0.6 V

• 

[HOME] key is pressed : 0.76 to 0.95 V

2)

When the voltage value is below, HOLD switch (S881) is normal.
• 

HOLD switch is turned on  : 2.85 V

• 

HOLD switch is turned off : 0 V

Note: Refer to page 27 for the schematic diagram. Refer to page 

28 for the printed wiring boards.