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NWZ-S636F/S636FK/S638F/S639F/S736F/S738F/S739F
5
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 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.
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 16).
Judge the right and wrong of the switch referring to “4-4-2. 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 (S603)
Connection:
Judge the right and wrong of the switch by the voltage measure-
ment with a test point.
2-1. RESET key (S603)
Connection:
+
–
–
digital voltmeter
JL646 (XRESET)
JL910 (D_GND)
When the voltage value is below, RESET key (S603) is normal.
•
•
RESET key (S603) is pressed
: 0 V
•
RESET key (S603) is not pressed : 2.85 V
2-2. NOISE CANCELING switch (S871)
(NWZ-S736F/S738F/S739F
only)
Connection:
+
–
–
digital voltmeter
JL609 (NC_ON)
JL910 (D_GND)
JL910 (D_GND)
When the voltage value is below, NOISE CANCELING switch
(S871) is normal.
•
(S871) is normal.
•
NOISE CANCELING switch (S871) is turned on : 0 V
•
NOISE CANCELING switch (S871) is turned off : 2.85 V
2-3. HOLD switch
Connection:
Connection:
+
–
–
digital voltmeter
R861
JL910 (D_GND)
When the voltage value is below, HOLD switch is normal.
•
•
HOLD switch was is turned on : 0 V
•
HOLD switch was is turned off : 2.85 V
2-4. [VOL +]/[VOL –] keys
Connection:
Connection:
+
–
–
digital voltmeter
JL867 (KEY_VOL_I)
JL910 (D_GND)
When the voltage value is below, [VOL +]/[VOL –] keys are nor-
mal.
•
mal.
•
Keys are not pressed : 2.85 V
•
[VOL -] key is pressed : 0 to 0.25 V
•
[VOL +] key is pressed : 0.4 to 0.6 V
2-5. [
u
]/[
B
]/[
b
]/[
v
]/[
V
] keys (S872 - S876)
Connection:
+
–
–
digital voltmeter
JL874 (KEY_AD0)
JL875 (A_GND)
When the voltage value is below, [
u
]/[
B
]/[
b
]/[
v
]/[
V
] keys are
normal.
•
•
Keys (S872 - S876) are not pressed : 2.85 V
• [
u
] key (S872) is pressed
: 0 to 0.25 V
• [
B
] key (S873) is pressed
: 0.4 to 0.6 V
• [
b
] key (S874) is pressed
: 0.75 to 0.95 V
• [
v
] key (S875) is pressed
: 1.11 to 1.31 V
• [
V
] key (S876) is pressed
: 1.46 to 1.66 V
2-6. [BACK] [OPTION] keys (S877, S878)
Connection:
Connection:
+
–
–
digital voltmeter
JL873 (KEY_AD1)
JL875 (A_GND)
When the voltage value is below, [BACK] [OPTION] keys (S877,
S878) are normal.
•
S878) are normal.
•
Keys (S877, S878) are not pressed : 2.85 V
•
[BACK] key (S877) is pressed
: 0.75 to 0.95 V
•
[OPTION] key (S878) is pressed : 1.11 to 1.31 V
Connection location:
JL910
(D_GND)
JL875
(A_GND)
JL874
(KEY_AD0)
JL873
(KEY_AD1)
JL609
(NC_ON)
JL646
(XRESET)
R861
– MAIN Board (Side B) –
– SW/AU Board (Side A) –
Note: Refer to page 19 for the schematic diagram. Refer to page
20 for the printed wiring boards.
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