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NWZ-A726, NWZ-A726B, NWZ-A728, NWZ-A728B, NWZ-A729 - Sony Audio Service Manual (repair manual). Page 11

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11
NWZ-A726/A726B/A728/A728B/A729
4-2-1. Output check
“1 kHz 0 dBs L-ch/R-ch VOLUME: 25” audio signal is output-
ted.
Checking method:
1.  Enter the test mode.
2. Press 
the 
[
v
]/[
V
] key to select the “AUDIO”, and press the [
B
] 
key to enter the minor item.
3.  Press the [
v
]/[
V
] key to select the “OUTPUT”.
4.  Press the [
u
] key, “1 kHz 0 dBs L-ch/R-ch VOLUME: 25” 
audio signal is outputted.
   
liquid crystal display
AUDIO OUTPUT
1kHz 0dBs L/Rch
HPOUT [ VOL: 25 ]
START
5.  Press the [BACK] key, return to minor item selection screen.
4-2-2. S/N check
“Infi nity Zero VOLUME: 30” audio signal is outputted.
Checking method:
1.  Enter the test mode.
2. Press 
the 
[
v
]/[
V
] key to select the “AUDIO”, and press the [
B
] 
key to enter the minor item.
3.  Press the [
v
]/[
V
] key to select the “SN”.
4.  Press the [
u
] key, “Infi nity Zero VOLUME: 30” audio signal 
is outputted.
   
liquid crystal display
AUDIO SN
Infi nity Zero
HPOUT [ VOL: 30 ]
START
5.  Press the [BACK] key, return to minor item selection screen.
4-2-3.  Frequency characteristic 1 check
“20 Hz 0 dBs L-ch/R-ch VOLUME: 25” audio signal is output-
ted.
Checking method:
1.  Enter the test mode.
2.  Press the [
v
]/[
V
] key to select the “AUDIO”, and press the [
B
] 
key to enter the minor item.
3.  Press the [
v
]/[
V
] key to select the “F1”.
4.  Press the [
u
] key, “20 Hz 0 dBs L-ch/R-ch VOLUME: 25” 
audio signal is outputted.
   
liquid crystal display
AUDIO F1
20Hz 0dBs L/Rch
HPOUT [ VOL: 25 ]
START
5.  Press the [BACK] key, return to minor item selection screen.
4-2-4.  Frequency characteristic 2 check
“20 kHz 0 dBs L-ch/R-ch VOLUME: 25” audio signal is output-
ted.
Checking method:
1.  Enter the test mode.
2.  Press the [
v
]/[
V
] key to select the “AUDIO”, and press the [
B
] 
key to enter the minor item.
3.  Press the [
v
]/[
V
] key to select the “F2”.
4.  Press the [
u
] key, “20 kHz 0 dBs L-ch/R-ch VOLUME: 25” 
audio signal is outputted.
   
liquid crystal display
AUDIO F2
20kHz 0dBs L/Rch
HPOUT [ VOL: 25 ]
START
5.  Press the [BACK] key, return to minor item selection screen.
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