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Versione corrente di: Daniel B ,

Testo:

[quote] Earphone jack not working [/quote] is not precise enough but a common issue seems to be the small headphone icon is no more displayed when connecting a headphone. This may happens for 2 reasons:
+
- Some male jacks does not respects dimensional specifications and are not properly recognised. Either N8 says "Device not supported" or nothing happens. Try with another headphone.
+
- Some users reports the earphones are not recognised following a chock. User should remember their N8 felt on the ground.
-The female connector on the printed board is not the root cause, neither is the small flat cable. It seems there is a sensitivity on the main board (or "G fuse" set for purpuse) that locks the feature. I checked on a device having the problem and all points described below were ok.
+The female connector on the printed board is not the root cause, neither is the small flat cable. It seems there is a sensitivity on the main board (or "G fuse" set for purpose) that locks the feature. I checked on a device having the problem and all points described below were ok.
-The phone detects a headphone via 2 informations.
+The phone detects a headphone via 2 informations.
+
1) The female connector on the N8 features a switch that activates circuitry only if a jack is introduced. This saves power. Introduction of a dummy jack in plastic activates the switch that power-on the circuitry (i.e. the microphone input receives 2.4v) but a headphone is not detected by the N8.
+
2) Actual identification of the type of headphone is based on resistance between ground and microphone input:
- - short-circuit (~0 volts) = just a headphone
- - medium resistance (i.e. resulting in ~1.2 volts) = headset with a mike.
+
+- short-circuit (~0 volts) = just a headphone
+
+- medium resistance (i.e. resulting in ~1.2 volts) = headset with a mike.
Using a 3 poles standard jack cable we can check that: Introducing the jack, it short-circuits ground and microphone tip and the small headphone icon is displayed.
+
Using a 4 poles jack allows to check the voltage on the microphone tip.

Stato:

open

Modifica di: Daniel B ,

Testo:

-The jack on the printed board features a switch for physical introduction detection but it seems not connected: Introduction of a dummy jack in plastic activates the switch but is not detected by the N8.
+[quote] Earphone jack not working [/quote] is not precise enough but a common issue seems to be the small headphone icon is no more displayed when connecting a headphone. This may happens for 2 reasons:
+- Some male jacks does not respects dimensional specifications and are not properly recognised. Either N8 says "Device not supported" or nothing happens. Try with another headphone.
+- Some users reports the earphones are not recognised following a chock. User should remember their N8 felt on the ground.
-The phone detects introduction of a jack by temporary short-circuits between ground and microphone input (purple link on the picture). A small headphone icon is displayed.
+The female connector on the printed board is not the root cause, neither is the small flat cable. It seems there is a sensitivity on the main board (or "G fuse" set for purpuse) that locks the feature. I checked on a device having the problem and all points described below were ok.
-Identification of the type of headphone is based on resistance between ground and microphone input:
+The phone detects a headphone via 2 informations.
+1) The female connector on the N8 features a switch that activates circuitry only if a jack is introduced. This saves power. Introduction of a dummy jack in plastic activates the switch that power-on the circuitry (i.e. the microphone input receives 2.4v) but a headphone is not detected by the N8.
+2) Actual identification of the type of headphone is based on resistance between ground and microphone input:
+ - short-circuit (~0 volts) = just a headphone
+ - medium resistance (i.e. resulting in ~1.2 volts) = headset with a mike.
-short-circuit = pure headphone
-
-medium resistance (~1 kohm) = headset with a mike.
-
-Some male jacks does not respects dimensional specifications and are not properly recognised. Either N8 says "Device not supported" or nothing happens (no headphone icon).
+Using a 3 poles standard jack cable we can check that: Introducing the jack, it short-circuits ground and microphone tip and the small headphone icon is displayed.
+Using a 4 poles jack allows to check the voltage on the microphone tip.

Stato:

open

Post originale di: Daniel B ,

Testo:

The jack on the printed board features a switch for physical introduction detection but it seems not connected: Introduction of a dummy jack in plastic activates the switch but is not detected by the N8.

The phone detects introduction of a jack by temporary short-circuits between ground and microphone input (purple link on the picture). A small headphone icon is displayed.

Identification of the type of headphone is based on resistance between ground and microphone input:

short-circuit = pure headphone

medium resistance (~1 kohm) = headset with a mike.

Some male jacks does not respects dimensional specifications and are not properly recognised. Either N8 says "Device not supported" or nothing happens (no headphone icon).

Stato:

open