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KX-FP365CX / KX-FM388CX
6.3.7.
RTC Backup Circuit
1.
Function
This unit has a lithium battery (BAT401) which works for Real Time Clock IC (RTC: inside IC1).
The RTC continues to work, backed up by a lithium battery even when the power switch is OFF.
The user parameters for autodial numbers, the system setup data and others are in the FLASH MEMORY (IC6).
2.
RTC Inside (IC1) Backup Circuit Operation
When the power switch is turned ON, power is supplied through Q7 to the RTC (inside IC1). At this time, the voltage at pin 14
of the IC1 is +2.5V. When the power switch is turned OFF, the BAT401 supplies power to RTC through D407 and Q505. The
voltage at pin 14 of IC1 is about +2.2V. When the power switch is OFF and the voltage of +3.3V decreases, pin 14 of RTC
(IC1) becomes roughly the same voltage as the battery voltage. RTC goes into the backup mode, in which the power con-
sumption is lower.
Summary of Contents for KX-FM388CX
Page 12: ...12 KX FP365CX KX FM388CX 6 Technical Descriptions 6 1 Connection Diagram ...
Page 14: ...14 KX FP365CX KX FM388CX 6 2 1 General Block Diagram ...
Page 16: ...16 KX FP365CX KX FM388CX 6 3 2 Memory Map ...
Page 25: ...25 KX FP365CX KX FM388CX 6 4 2 Block Diagram ...
Page 27: ...27 KX FP365CX KX FM388CX ...
Page 78: ...78 KX FP365CX KX FM388CX Countermeasure ...
Page 79: ...79 KX FP365CX KX FM388CX REFERENCE Test Mode P 63 ...
Page 80: ...80 KX FP365CX KX FM388CX REFERENCE Test Mode P 63 ...
Page 81: ...81 KX FP365CX KX FM388CX REFERENCE Test Mode P 63 ...
Page 82: ...82 KX FP365CX KX FM388CX REFERENCE Test Mode P 63 ...
Page 83: ...83 KX FP365CX KX FM388CX ...
Page 84: ...84 KX FP365CX KX FM388CX ...
Page 85: ...85 KX FP365CX KX FM388CX REFERENCE Test Mode P 63 ...
Page 89: ...89 KX FP365CX KX FM388CX ...
Page 114: ...114 KX FP365CX KX FM388CX ...
Page 121: ...121 KX FP365CX KX FM388CX I O and Pin No Diagram ...
Page 124: ...124 KX FP365CX KX FM388CX 12 5 5 2 NG Example ...
Page 130: ...130 KX FP365CX KX FM388CX 12 5 8 2 Troubleshooting Flow Chart ...
Page 136: ...136 KX FP365CX KX FM388CX 12 5 12 Thermal Head Section Note Refer to Thermal Head P 26 ...
Page 139: ...139 KX FP365CX KX FM388CX 13 Service Fixture Tools ...
Page 142: ...142 KX FP365CX KX FM388CX 14 1 2 How to Remove the Thermal Head ...
Page 144: ...144 KX FP365CX KX FM388CX 14 2 2 How to Remove the Pickup Roller ...
Page 145: ...145 KX FP365CX KX FM388CX 14 2 3 How to Remove the Paper Exit Roller and Cassette Lever ...
Page 146: ...146 KX FP365CX KX FM388CX 14 3 Lower Cabinet Section 14 3 1 How to Remove the Bottom Frame ...
Page 147: ...147 KX FP365CX KX FM388CX 14 3 2 How to Remove the Digital Analog Interface and Sensor Boards ...
Page 148: ...149 KX FP365CX KX FM388CX 14 3 4 How to Remove the Gear Block and Separation Roller ...
Page 149: ...148 KX FP365CX KX FM388CX 14 3 3 How to Remove the Power Supply Board and AC cord ...
Page 150: ...150 KX FP365CX KX FM388CX 14 3 5 How to Remove the Component parts of Gear Block ...
Page 153: ...153 KX FP365CX KX FM388CX 14 4 3 How to Remove the Separation Rubber ...
Page 154: ...154 KX FP365CX KX FM388CX 14 5 Installation Position of the Lead Wires ...
Page 155: ...155 KX FP365CX KX FM388CX ...
Page 168: ...168 KX FP365CX KX FM388CX 16 1 4 Power Supply Board 16 1 5 Interface Board ...
Page 170: ...170 KX FP365CX KX FM388CX 16 3 Test Chart 16 3 1 ITU T No 1 Test chart ...
Page 171: ...171 KX FP365CX KX FM388CX 16 3 2 ITU T No 2 Test Chart ...
Page 172: ...172 KX FP365CX KX FM388CX 16 3 3 Test Chart ...
Page 173: ...173 KX FP365CX KX FM388CX Memo ...
Page 194: ...194 KX FP365CX KX FM388CX 20 1 2 Operation Cover Section ...
Page 195: ...195 KX FP365CX KX FM388CX 20 1 3 Back Cover Section ...
Page 196: ...196 KX FP365CX KX FM388CX ...
Page 197: ...197 KX FP365CX KX FM388CX 20 1 4 Upper Cabinet Section ...
Page 198: ...198 KX FP365CX KX FM388CX 20 1 5 Lower Cabinet Section ...
Page 199: ...199 KX FP365CX KX FM388CX 20 1 6 Gear Block Section 20 1 7 Screws ...
Page 200: ...200 KX FP365CX KX FM388CX 20 1 8 Accessories and Packing Materials ...