TEST AND MEASUREMENT
Issue 1
Section 6
MCUK990801C8
Revision 0
– 48 –
Service Manual
16.
Press [F6]. Go to, and select: "TRIM Other" again. Go to, and select: "BAT TEMP". Enter value from step 14 above.
Charging Calibration
17.
For this procedure, set up the equipment as follows.
a.
Connect 82
Ω
1 W resistor between VBAT and Ground.
b.
Connect PSU1 between VBAT and Ground, set to 3.7 volts and switch on. (note that this gives 50 mA)
c.
Connect a second PSU (PSU2) to the phone via the phone's external connector. Set PSU2 to 5.8 volts - current limit
set to 700 mA.
18.
Press {shift}+[F4].
19.
Go to, and select: "Set DAC Data". Type a value of 714, [enter].
20.
Using arrows
↑↓
, highlight "Control out". Use
←→
arrows to highlight and select "CRG ON".
21.
Disconnect VBAT by switching PSU1 output OFF.
22.
Measure VBAT voltage at test battery. If the voltage is inside the range 4.1 V ± 5 mV then go to step 27 below. Otherwise,
calculate the difference thus:- (measured voltage - 4.2)/0.00616 = difference.
23.
Press {shift}+[F4].
24.
Go to, and select: "Set DAC Data". Enter value of:- (previously set value (which you originally set to 714)) - result from step
22 above (integer only).
25.
Repeat steps 22 to 24 until measured voltage is 4.1 V ± 5 mV
26.
If the final value for DAC Data is outside the range 710 ± 40 then there is a fault, and further investigation is required.
Otherwise store the value as described below.
27.
Press [F6]; Go to, and select:- "Trim Other";
28.
Go to, and select:- "DAC Reference"; Enter value.
29.
Press {shift}+[F4].
30.
Go to, and select:- "Set DAC Data".
31.
Enter:- (value stored in step 28) - 200.
32.
Press [F4].
33.
Go to, and select:- View ADC lines.
34.
Read value for ADIN1 ("BAT VOLT").
35.
If ["BAT VOLT HIGH" (from step 5) - value read above], is inside the range 213 ± 42 then go to step 36 below to store
value. Otherwise there is a fault, and further investigation is required.
36.
Press [N] (in repeat yes/no box), then [enter]. Press [F6]; Highlight and select "Trim Other".
37.
Highlight and select "DAC Step".
38.
Enter value obtained in step 35, above.
39.
Press {shift}+[F4].
40.
Select: "Set DAC Data".
41.
Re-enter original value from step 26 (i.e. present value +200).
42.
Press [F4].
43.
Highlight, and select:- "View ADC Lines".
44.
Read ADIN5 (CRG CURRENT) value and record it as "Total current".
45.
Disconnect the 82
Ω
Resistor.
46.
Press [Y], [enter] to read ADC value again, and record it as "Phone current".
47.
"Charge current" = "Total current" - "Phone current". If this outside the range 43 ± 4 then there is a fault, and further
investigation is required. Otherwise, calculate offset thus:- "Charging current" - 43 = Offset.
48.
Press [N] (in repeat yes/no box), then [enter]. Press [F6]
49.
Go to, and select:- "TRIM other".
50.
Go to, and select:- "Complete offset".
51.
Enter offset calculated above.
52.
At the end of all tests, turn OFF power supplies and remove the phone.
