Sony NWZE436FR Service Manual page 5

Note: Refer to page 20 for the schematic diagram.
Refer to page 19 for the printed wiring boards.
METHOD OF JUDGING RIGHT AND WRONG OF
PARTS RELATED TO SWITCH
In this set, only a part of parts that relate to the switch are sup-
plied.
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 "4-4-3. Key
check" (page 16).
2. Judgment from the voltage measurement
Judge the right and wrong of the switch by the voltage measure-
ment with a test point.
2-1. RESET key (SW1)
Connection:
digital voltmeter
R1
+
–
T8 (FM_GND)
When the voltage value is below, RESET key (SW1) is nomal.
• RESET key (SW1) is pressed
• RESET key (SW1) is not pressed
2-2. HOLD switch (SW610)
Connection:
digital voltmeter
J601 pin
+
J601 pin –
When the voltage value is below, HOLD switch (SW610) is
nomal.
• HOLD switch (SW610) is turned on : 0 V
• HOLD switch (SW610) is turned off : 3.1 V
2-3. [u]/[B]/[b]/[v]/[V]/[BACK]/[OPTION]/[VOL +]/[VOL –]
keys
Connection:
digital voltmeter
D2 (anode)
+
J4 pin –
When the voltage value is below, [u]/[B]/[b]/[v]/[V]/[BACK]
[OPTION]/[VOL +]/[VOL –] keys are nomal.
• Keys are not pressed
• [u] key (SW605) is pressed
• [B] key (SW606) is pressed
• [b] key (SW607) is pressed
• [v] key (SW608) is pressed
• [V] key (SW609) is pressed
• [BACK] key (SW604) is pressed
• [VOL –] key is pressed
• [VOL +] key was pushed
: 0 V
: 3.1 V
: 3.1 V
: 1.35 to 1.53 V
: 1.71 to 1.85 V
: 2.03 to 2.15 V
: 2.36 to 2.46 V
: 2.69 to 2.85 V
: 1.09 to 1.20 V
: 0.12 to 0.40 V
: 0.68 to 0.95 V
NWZ-E435F/E436F/E438F
2-4. OPTION key (SW601)
Connection:
digital voltmeter
J601 pin
+
–
J601 pin
When the voltage value is below, OPTION key (SW601) is
nomal.
• OPTION key (SW601) is pressed
• OPTION key (SW601) is not pressed : 3.1 V
Connection location:
– MAIN Board (Side A) –
– MAIN Board (Side B) –
R1
– KEY Board (Side B) –
J601
29
30
9
4
1
2
: 0 V
30
29
D2
J4
2
1
T8 (FM_GND)
5