12 063
правки
WB SH 3.5: Errata/en: различия между версиями
Новая страница: «thumb|500px| C5 capacitor in WB SH rev. 3.5 (0350006)»
(Новая страница: «'''Description'''») |
(Новая страница: «thumb|500px| C5 capacitor in WB SH rev. 3.5 (0350006)») |
||
| (не показано 14 промежуточных версий этого же участника) | |||
| Строка 117: | Строка 117: | ||
'''Description''' | '''Description''' | ||
PRTCTRL lines (power management for USB devices) | |||
are susceptible to interference from the radiation of the GSM antenna. | |||
At high output power GSM and is close to the antenna location, interference lead to short-term withdrawal power with USB devices. | |||
''' | '''Symptoms''' | ||
If GSM is active and the signal level is poor, it can be observed under certain conditions: | |||
* | * disable and reconnect the Wi-Fi module | ||
* | * disconnect and reconnect external USB devices | ||
''' | '''How to fix''' | ||
* | * Change the location of the built-in GSM antenna in the housing | ||
* | * Take the built-in GSM antenna outside the case | ||
* | * Use external GSM antenna | ||
== 0350006: | = = = 0350006: Board power supply problems == | ||
''' | '''Revision''': | ||
3.5 | 3.5 | ||
''' | '''Description''' | ||
Incorrect C5 capacitor value in a very small number of boards shipped before June 10, 2014. | |||
''' | '''Symptoms''' | ||
There are problems with switching the Board on: the device turns on only after several switches of the on/off button. | |||
''' | '''How to fix''' | ||
* | * Change the capacitor C5 to the capacitor of capacity 1 µf (see figure) | ||
[[File:WB3top c5.jpg|thumb|500px| | [[File:WB3top c5.jpg|thumb|500px| C5 capacitor in WB SH rev. 3.5 (0350006)]] | ||