Panasonic G600 Technical Manual

Also see for EB-CR600: Service manual Service manual Service manual

Contents

http://cxema.ru10.2 Dual Charger10.2.1 Circuit DescriptionA battery present is detected by the TH input, and battery type is detected by the S input. The S input isopen-circuit on a small battery, pulling the base of Q13 high, turning it off. The base of Q2 is pulled low throughR24, turning Q2 ON. This switches the extra control resistor VR1 into circuit, increasing the timer clock rate. VR2 isused to control the clock rate when a large battery is connected.The charging circuit is controlled by the current drawn by the handheld unit. If the handheld unit receives a call andthus requires greater than 300mA, then it switches the charger off, only switching it back on again when the currentdrops below 200mA. These current levels are controlled by VR3 (set the stop point) and VR4 (set the start point).The power out for the handheld unit is protected by Q11, Q16, and Q5. When the power is connected, a smallcurrent can flow through R27 and the bleed resistor R33. Through the potential divider R39 and R38, this turns Q5ON, turning Q16 ON. Should the output CN2 become accidentally short-circuited the base of Q5 becomes lowturning Q5 OFF. This pulls the base of Q16 high, turning Q16 OFF and shutting off the power.10.2.2 Adjustment ProcedureIf any of the main components in the charger are replaced then the following procedure must be followed. Theprocedure first adjusts the charge rate timer for each battery, followed by the control current levels for switching thecharger on and off.Connect the charger as shown in the following diagram.Figure 1: Charger Connections 600-1101Adjust VR2 until the pulses on pin 3 of IC 2 have a period of 10mS ± 0.5mS. Open the switch S1 and adjust VR1until the pulses have a period of 3.45mS ± 1.5mS.With S1 closed connect a load of 300mA ± 5mA across the output that goes to the handheld unit. Adjust VR3 sothat clock pulses on pin 3 of IC 2 stop i.e. there is a steady level of 5V or 0V. Now reduce the load to 200mA ± 5mAand adjust VR4 so that the pulses start again.MCUK980101G8 Section 10 Issue 1Technical Guide 10 - 5 Revision 0ACCESSORIES+STHGND10KS130 3W10mS

/ 45

Related manuals for Panasonic EB-CR600