ICD-UX502 - Sony Audio Service Manual (repair manual). Page 14

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ICD-UX502
14
4-3. AUDIO LOOP
Audio loop back operation can be performed.
Procedure:
1.  Enter the test mode.
2.  Press the [
>
] or [
.
] keys to select the “AUDIO LOOP”, 
and press the [
N
/ENTER] key.
3.  Audio loop back operation is performed.
 
(Displayed characters/values in the following fi gure are ex-
ample)
Note: When mode is active, the recording level for VOR is acquired at in-
tervals of 1 second, and it is displayed. When the acquired recording 
level is larger than the VOR setting value, the operation indicator 
LED redly lights up.
 
(Threshold value is based on operation of this unit)
<AUDIO LOOP>
MIC: M AGC: OFF
Vol: 10 MIC IN
D H0 D0
VOR: 00003FFF
D: DAMP, (A: Codec)
H0: HP_MUTE=L, (H1: H)
D0: DAMP_XSEL=L, (D1: H)
LCD Display
 
Initial value:
 
Play back volume 
: 10 (stereo)
 
fs 
: 44.1 kHz
 
Microphone sensitivity  : M
 
External microphone 
: MIC IN
 HP_MUTE 
L
 DAMP_XSEL 
L
 
Sound is outputted from the D-AMP built-in CPU at the time 
of headphone wearing.
 
Key input settings under this mode of operation:
 
[VOL +] 
: Volume up
 
[VOL –] 
: Volume down
 [REC/PAUSE/
z
] : Microphone sensitivity change 
 
 
  (H → L → M → H...)
 
[
N
/ENTER] 
: External microphone sensitivity
 
 
  (mounted model only)
 
 
  (MIC IN ↔ LINE IN)
 
[
.
: AGC operation (ON ↔ OFF)
 
[
>
: The headphone amplifi er change
 
 
  (mounted model only)
 
 
  (D-AMP ↔ Codec)
 
[ERASE] 
: HP_MUTE forcible operation
 
 
  Only HP_MUTE is changed with a 
 
 
  play back state held (ON ↔ OFF).
 
[
 /
A-B] 
: DAMP_XSEL forcible operation
 
 
  Only DAMP_XSEL is changed with
 
 
  a play back state held (ON ↔ OFF).
Operation of others by the plug/unplug signal (the external micro-
phone jack and headphone jack) are based on operation of this unit.
Releasing method:
Press the [STOP/
x
] key, return to test mode menu.
4-4. SIN
Sine wave can be outputted.
Procedure:
1.  Enter the test mode.
2.  Press the [
>
] or [
.
] keys to select the “SIN”, and press 
the [
N
/ENTER] key.
3.  Sine wave is outputted.
 
(Displayed characters/values in the following fi gure are ex-
ample)
<SIN>
Vol:10
LCD Display
 
Initial value:
 
Play back volume  : 10 (stereo)
 fs 
44.1kHz
 
Sound is outputted from the D-AMP built-in CPU at the time 
of headphone wearing.
 
Key input settings under this mode of operation:
 
[VOL +]  : Volume up
 
[VOL –]  : Volume down
Operation of others by the plug/unplug signal (the external micro-
phone jack and headphone jack) are based on operation of this unit.
Releasing method:
Press the [STOP/
x
] key, return to test mode menu.
4-5. BEEP
Beep sound (1.3 kHz) can be outputted.
Procedure:
1.  Enter the test mode.
2. Press 
the 
[
>
] or [
.
] keys to select the “BEEP”, and press 
the [
N
/ENTER] key.
3.  Beep sound (1.3 kHz) is outputted.
 
(Displayed characters/values in the following fi gure are ex-
ample)
<BEEP>
1.3KHz ON
Vol:10
LCD Display
 
Key input settings under this mode of operation:
 
[VOL +]  : Volume up
 
[VOL –]  : Volume down
Releasing method:
Press the [STOP/
x
] key, return to test mode menu.
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