Panasonic GD90 Service Manual page 54

TEST AND MEASUREMENT
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
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.
Issue 1
Revision 0
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arrows to highlight and select "CRG ON".
Section 6
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MCUK990801C8
Service Manual