General checkout
21
To verify a symptom, follow the steps below:
1.
Turn off the computer.
2.
Remove the battery pack.
3.
Connect the AC adapter.
4.
Make sure that power is supplied when you turn on the computer.
5.
Turn off the computer.
6.
Disconnect the AC adapter and install the charged battery pack.
7.
Make sure that the battery pack supplies power when you turn on the
computer.
If you suspect a power problem, see the appropriate one of the following power
supply checkouts:
• “Checking the Computer AC Charger” on page 21
• “Checking the internal battery status” on page 22
Checking the Computer AC Charger
When you use the computer AC Charger to charge the tablet but no power is
charged, see the instructions in this topic to check the computer AC Charger.
To check the computer AC Charger, do the following:
1.
Disconnect the micro-USB cable from the tablet.
2.
Measure the output voltage across the connector marked B of the micro-USB
cable. Refer to the following figure:
Note:
The output voltage across pin 3 of the micro-B connector might be
different from the one you are servicing.
3.
If the voltage is not correct, replace the micro-USB cable.
4.
If the voltage is acceptable, replace the system board.
Power system checkout
Pin
Volta
g
e (V dc)
1
Ground
2
0
3
+5
1 2
3 (5V)
Summary of Contents for PB1-750M
Page 1: ...Lenovo PHAB Hardware Maintenance Manual Lenovo PB1 750M Lenovo PB1 750N Lenovo PB1 750P ...
Page 33: ...Lenovo PHAB 29 ...
Page 41: ...Lenovo PHAB 37 Figure 1 7 The removed rear cover and side key ...
Page 45: ...Lenovo PHAB 41 Figure 2 6 The removed battery pack ...
Page 55: ...Lenovo PHAB 51 Figure 7 3 The removed speaker box ...
Page 65: ...Lenovo PHAB 61 Figure 9 11 The removed main FPC ...
Page 68: ...Lenovo PHAB Hardware Maintenance Manual 64 Figure 10 4 The removed SIM board ...
