Test 33 Bb Cal Ichar Gain; Test 34 Bb Cal Ichar Offset - Nokia RH-17 Series Troubleshooting - Rf

RH-17
Troubleshooting — RF
Troubleshooting:
For production the VCHAR voltage is sent to galvanic pads on the PWB. Check for solder
bridge on X104, fuse F100, L100, C106 and V100. Remember that this gain factor is
determined using Test 26 as a reference, make sure it was within limits also.

Test 33 BB Cal ICHAR Gain

Description:
This baseband calibration teaches the ADC what two different charger current inputs
look like. Voltage input is at 6.0 Vdc at two different current limits, lower being limited
to 200 mA, higher current limit is set at 800 mA. Then PCI command to instruct phone to
turn on charger circuitry.
Explanation of Result:
The gain factor is a result of the two current limits along with global value determined
in Test 25 which is then used to calculate ICHAR Gain.
Manual Verification:
In Phoenix set phone to local mode then EM Calibration. Press read from phone.
Troubleshooting:
For production the VCHAR voltage is sent to galvanic pads on the PWB. Check current
sensing resistor R200 then D200, where the charging circuitry resides. Remember that
this gain factor is determined using Test 25 as a reference, make sure it was within limits
also.

Test 34 BB Cal ICHAR Offset

Description:
This baseband calibration teaches the ADC what two different charger current inputs
look like. Voltage input is at 6.0 Vdc at two different current limits, lower being limited
to 200 mA, higher current limit is set at 800 mA. Then PCI command to instruct phone to
turn on charger circuitry.
Explanation of Result:
The offset is a result of the two current limits along with global value determined in Test
26 which is then used to calculate ICHAR offset.
Manual Verification:
In Phoenix set phone to local mode then EM Calibration. Press read from phone.
Troubleshooting:
For production the VCHAR voltage is sent to galvanic pads on the PWB. Check current
sensing resistor R200 then D200, where the charging circuitry resides. Remember that
this gain factor is determined using Test 26 as a reference, make sure it was within limits
also.
Page 26
Nokia Corporation
CCS Technical Documentation
Confidential Issue 1 04/2003