HP ZBook Studio x360 Maintenance and Service Guide - Page 132

USB, The s below are intended for authorized service providers/technicians.

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Items Procedures In the example to the left, U-APSD support (Unscheduled Automatic Power Save Delivery) is changed to Disabled to resolve an incompatible access point. If disabling U-APSD improves the throughput issue, check with the access point provider for updated firmware that resolves the issue. 11. Test with verified working operating system or perform operating system recovery to verify that the issue is not caused by customized settings. 12. Test with a verified working wireless module. The sections below are intended for authorized service providers/technicians. 1. Verify that the wireless module and its antenna cables are fully inserted and in good condition (see WLAN module removal and replacement section). Reseat wireless module and antenna connection. 2. Verify module antenna cable connection are not loose. 3. Verify antenna cables are properly connected to the MAIN and AUX terminals (see WLAN module removal and replacement section). USB Items Symptoms ● USB devices are not recognized ● USB devices are not charging Examples of USB device Not Recognized Procedures Possible causes USB devices do not have the latest software drivers, port insufficient power, or not compliant. NOTE: USB Type-C uses a different connector entirely Troubleshooting steps 1. Unplug USB device and/or restart the computer (wait for 2-5 minutes) to reset USB port/hub in case of power surge. 2. Soft Reset (9. Soft reset (Default Settings) on page 87) and verify if USB device is recognized. 3. Verify if USB device is recognized in Device Manager > Universal Serial Bus Controller, or USB is recognized without Yellow bang. 4. Verify if the latest USB driver or/and USB chipset driver are installed. USB driver could be removed and reinstalled. 5. Make sure USB device is supported, for example, USB 3.0 device requires more power drawn (0.9A) from USB port than USB 2.0 device (0.5A). As a result, identify USB charging port to be used for charging a USB device, or an external AC power adapter may be required for an external USB storage to work properly. 6. Test with verified working USB devices (keyboard, mouse, USB key) to make sure USB ports are functional. 120 Chapter 6 Troubleshooting guide

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Items
Procedures
In the example to the left,
U-APSD support
(Unscheduled Automatic Power
Save Delivery) is changed to
Disabled
to resolve an incompatible access
point. If disabling U-APSD improves the throughput issue, check with the
access point provider for updated
firmware
that resolves the issue.
11.
Test with
verified
working operating system or perform operating system
recovery to verify that the issue is not caused by customized settings.
12.
Test with a
verified
working wireless module.
The sections below are intended for authorized service providers/technicians.
1.
Verify that the wireless module and its antenna cables are fully inserted
and in good condition (see WLAN module removal and replacement
section). Reseat wireless module and antenna connection.
2.
Verify module antenna cable connection are not loose.
3.
Verify antenna cables are properly connected to the MAIN and AUX
terminals (see WLAN module removal and replacement section).
USB
Items
Procedures
Symptoms
●
USB devices are not recognized
●
USB devices are not charging
Possible causes
USB devices do not have the latest software drivers, port
insufficient
power, or not
compliant.
NOTE:
USB Type-C uses a
different
connector entirely
Examples of USB device Not Recognized
Troubleshooting steps
1.
Unplug USB device and/or restart the computer (wait for 2-5 minutes) to reset USB
port/hub in case of power surge.
2.
Soft Reset (
9. Soft reset (Default Settings)
on page
87
) and verify if USB device is
recognized.
3.
Verify if USB device is recognized in
Device Manager > Universal Serial Bus
Controller
, or USB is recognized without Yellow bang.
4.
Verify if the latest USB driver or/and USB chipset driver are installed. USB driver
could be removed and reinstalled.
5.
Make sure USB device is supported, for example, USB 3.0 device requires more
power drawn (0.9A) from USB port than USB 2.0 device (0.5A). As a result, identify
USB charging port to be used for charging a USB device, or an external AC power
adapter may be required for an external USB storage to work properly.
6.
Test with
verified
working USB devices (keyboard, mouse, USB key) to make sure
USB ports are functional.
120
Chapter 6
Troubleshooting guide