Panasonic EB-GD52, Service Manual

Page: 57 / 92

TEST AND MEASUREMENT
MCUK000601C8 Section 6 Issue 1
Service Manual – 53 – Revision 0
Figure 6.34: Charging Calibration 2
5. Disconnect VBAT by setting the BCVCU Voltage switch to OFF.
6. Measure the voltage across the Test Battery terminals. If the voltage is within the range 4.2 V ±5 mV, proceed to step 11.
Otherwise, calculate the difference (DAC STEP) as follows:
difference = (measured voltage - 4.2 V) / 7.4 mV
7. Press Shift + F4.
8. Scroll down and select PROG CHARG-DAC DATA and enter the value calculated by subtracting the value recorded in
step 6 from the initial CHARG-DAC DATA value (439).
9. Repeat steps 6 to 8 until the measured voltage is 4.2 V ±5 mV.
10. If the final value is outside the range 342 - 542, then there is a fault and further investigation is required. Otherwise, record
the value for use later.
11. Press F6. Highlight TRIM OTHER and press ENTER. Highlight DAC REFERENCE and press ENTER.
Figure 6.35: Charging calibration 3
12. Enter the value recorded in step 10.