Sharp GX20 Service Manual - Page 81

Audio Test

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4. Audio Test Serial Signal Format for Audio Test Item Audio system power source and codec loop-back test. Incoming Serial Signal Command n PCMLP 4xx 3xx 2xx 1xx 0 H/S Detection EAR None CONFIDENTIAL Outgoing Serial Signal Response PCMLPnxx (xx: Volume level) Contents Mic to JackEar path check. JackMic to Earpiece check. Jack to Jack path check. Mic to Earpiece path check. Path release (Finished) EARON•EAROFF Detection of hands free insertion. GX20 Test Method Loop-back test for codec IC. Ex.: xx=20 (when the volume level is 5) PCMLP120: Checking that signals from the main unit microphone (TP324) are transmitted to the main unit earpiece (between TP167 and TP168). (In case that the volume level is 20) (Other cases.) PCMLP220: Inputting the signal from headset microphone (TP106) to check that it is output at the headset earpiece (TP107). PCMLP320: Between the hands free microphone and the main unit earpiece. PCMLP420: Between the main unit microphone and the hands free earpiece. PCMLP000: Exiting from the loopback. Detecting that the hands free is connected to the hands free connector. When "EAR" is transmitted: "EARON" is returned if the hands free is connected, and "EAROFF" returned if not connected. Gain Table during "Mic to Earpiece" and "JackMic to Earpiece" Path Check. xx 00 03 07 11 15 20 0x1F 0x12 0x10 0x0D 0x08 0x03 Table Value of Audio Volume DAC Output Gain (dB) Mute -18.0 dB -15.0 dB -10.5 dB -3.0 dB +4.5 dB Equivalent to Volume Position for User Setting Mute VOLUME 1 VOLUME 2 VOLUME 3 VOLUME 4 VOLUME 5 Gain Table during "Jack to Jack" and "Mic to JackEar" Path Check. xx 00 03 07 11 15 20 0x1F 0x0F 0x0C 0x09 0x06 0x03 Table Value of Audio Volume DAC Output Gain (dB) Mute -13.5 dB -9.0 dB -4.5 dB 0 dB +4.5 dB Equivalent to Volume Position for User Setting Mute VOLUME 1 VOLUME 2 VOLUME 3 VOLUME 4 VOLUME 5 2 - 75

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GX20
2 – 75
CONFIDENTIAL
4. Audio Test
Serial Signal Format for Audio Test
Gain Table during “Mic to Earpiece” and “JackMic to Earpiece” Path Check.
Gain Table during “Jack to Jack” and “Mic to JackEar” Path Check.
Item
Incoming Serial Signal
Outgoing Serial Signal
Contents
Test Method
Command
n
Response
Audio system
power source
and codec
loop-back
test.
PCMLP
4xx
3xx
2xx
1xx
0
PCMLPnxx
(xx: Volume level)
Mic to JackEar path check.
JackMic to Earpiece check.
Jack to Jack path check.
Mic to Earpiece path check.
Path release (Finished)
Loop-back test for codec IC.
Ex.: xx=20 (when the volume level
is 5)
PCMLP120: Checking that signals
from the main unit microphone
(TP324) are transmitted to the
main unit earpiece (between
TP167 and TP168). (In case that
the volume level is 20)
(Other cases.)
PCMLP220: Inputting the signal
from headset microphone (TP106)
to check that it is output at the
headset earpiece (TP107).
PCMLP320: Between the hands
free microphone and the main unit
earpiece.
PCMLP420: Between the main unit
microphone and the hands free
earpiece.
PCMLP000: Exiting from the loop-
back.
H/S Detection
EAR
None
EARON•EAROFF
Detection of hands free insertion.
Detecting that the hands free is
connected to the hands free con-
nector.
When “EAR” is transmitted:
“EARON” is returned if the hands
free is connected, and “EAROFF”
returned if not connected.
xx
Table Value of
Audio Volume
DAC Output Gain (dB)
Equivalent to Volume
Position for User Setting
00
0x1F
Mute
Mute
03
0x12
–18.0 dB
VOLUME 1
07
0x10
–15.0 dB
VOLUME 2
11
0x0D
–10.5 dB
VOLUME 3
15
0x08
–3.0 dB
VOLUME 4
20
0x03
+4.5 dB
VOLUME 5
xx
Table Value of
Audio Volume
DAC Output Gain (dB)
Equivalent to Volume
Position for User Setting
00
0x1F
Mute
Mute
03
0x0F
–13.5 dB
VOLUME 1
07
0x0C
–9.0 dB
VOLUME 2
11
0x09
–4.5 dB
VOLUME 3
15
0x06
0 dB
VOLUME 4
20
0x03
+4.5 dB
VOLUME 5