ICD-SX750, ICD-SX750D, ICD-SX850, ICD-SX850D, ICD-SX950 - Sony Audio Service Manual (repair manual). Page 11

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ICD-SX750/SX750D/SX850/SX850D/SX950
11

3. Loop test
Execute the DSP LOOP BACK.
1
6
3
4
2
5
•  Press the [ /MENU] button to return to the test mode 
screen.
4. ExtMic Cal
•  The external microphone R and L channels level difference 
is calibrated.
•  Press the [
Nx
] button to start calibration.
•  Press the [
x
] button to return to the test mode screen.
5.   SetMic Cal
•  The internal microphone R and L channels level difference 
is calibrated.
•  Press the [
Nx
] button to start calibration.
•  Press the [
x
] button to return to the test mode screen.
6. Beep test
•  Beep sound of 1.3 kHz is output.
•  Press the [
Nx
] button to start outputting and press the [
x
] 
button to stop.
•  Press the [ /MENU] button to return to the test mode 
screen.
7.  LCD Contrast test
•  Adjust the LCD contrast.
  Default value is 10. 
•  Adjust the LCD contrast using the [
>
]/[
.
] button.
•  Press the [ /MENU] button to return to the test mode 
screen.
8.  Cluster Num test
•  This is the cluster number display to be used for engineering 
design.
•  Press the [
x
] button to return the test mode screen.
9.  RTC Interrupt test
•  Perform the self test of the RTC.
•  Press the [
x
] button to return to the test mode screen.
10. Battery test
•  The detected A/D value of the battery remaining power is 
checked. 
•  Press the [
x
] or [ /MENU] button to return to the test 
mode screen.
11. Batt Cnt test
•  The present A/D value of the center of the battery remaining 
is checked. 
•  When the battery is not connected, NG is display.
•  Press the [
x
] or [ /MENU] button to return to the test 
mode screen.
12. Batt AC2 test
•  The present A/D value of the side of VBatAC x2 on the error 
amplifi ed circuit (IC1603 output) is checked. 
•  Press the [
x
] or [ /MENU] button to return to the test 
mode screen.
13. Batt AB4 test
•  The present A/D value of the side of VBatAB x4 on the error 
amplifi ed circuit (IC1603 output) is checked. 
•  Press the [
x
] or [ /MENU] button to return to the test 
mode screen.
* : 12, 13 items, refer to following fi g.
70k
110k
ADIN1
(VCCVBAT)
ErrorAmp
ADIN7
(VBAT_ERR)
ADIN8
(VBAT_CNT)
B
C
A
VBatAB
VBatBC
VBatAC
IC1001
IC1603
Q1664
Q1663
x2SIDE
x4SIDE
14. VBUS test
•  The present value of the VBUS is checked.
  If it is connected, OK is display. 
•  Press the [
x
] or [ /MENU] button to return to the test 
mode screen.
15. Sleep test
•  Sleep is tested.
 

Note:  When <Sleep> is selected, the machine enter the sleep mode. 
To exit the sleep mode, turn off the power, by removing the bat-
teries and reenter the test mode.
16. App Log Out test
•  This is the app log out to be used for engineering design.
•  Press the [
x
] button to return the test mode screen.
17. Log Output test
•  This is the log output to be used for engineering design. 

 Note:  Not used.
•  Press the [
x
] button to return to the test mode screen.
Test
Key SWITCH
Description
1
Sound vol-
ume test
[VOL +], 
[VOL –]
The sound volume can be adjusted 
(Default value is 20.)
2
Recording 
level test
[.], [>]
Press the [.HOLD] switch to ON 
for MANUAL mode.
The recording level can be adjusted 
(Default value is 30.)
3
Muting test [DIVIDE/ ]
Muting test can be set to “ON” or 
“OFF”.
Directivity [DIRECTNL]
“ON” or “OFF” of the switch can be 
set the directivity of the microphone.
4
Setting of 
recording 
AUTO/
MANUAL
[.HOLD]
OFF: AUTO
ON: MANUAL
5
Sensitivity/
Limitter
[NOISE 
CUT]
AUTO ([.HOLD] SW:OFF):
(OFF: Sensitivity H, ON: Sensitiv-
ity L)
MANUAL ([.HOLD] SW:ON):
(OFF: Limitter OFF, ON: Limitter 
ON)
6
Selection 
of the 
external 
micro-
phone
[DPC]
Press the [.HOLD] switch to ON 
for MANUAL mode.
OFF: MIC IN, ON: AUDIO IN
Display
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