6.3.8.
SRAM AND RTC BACKUP CIRCUIT
1. Function
This unit has a lithium battery (BAT501) which works for the SRAM (IC504) and Real Time Clock IC (RTC: inside IC501).
The user parameters for autodial numbers, the system setup data and others are stored in the SRAM (IC504).
The RTC continues to work, backed up by a lithium battery even when the power switch is OFF.
2. SRAM (IC504) Backup Circuit Operation
When the power switch is turned ON, power is supplied through pin 12 of IC501 to the SRAM (IC504). At this time, the voltage
at pin 28 of the SRAM is 5V. When the power switch is turned OFF, the BATT supplies power to the SRAM through J501, R556
and D508. The voltage at pin 28 of the SRAM is about +2.5V. When the power switch is OFF and the voltage of +5V decreases,
the voltage detect IC (IC509) outputs "Low " level and the IC501 outputs the reset signal. Pin 28 of the SRAM becomes roughly
the same voltage as the battery voltage. At this point, pin 20 (CS) of IC504 becomes high level, causing the SRAM to go into
the backup mode, in which the power consumption is lower.
3. RTC Inside (IC501) Backup Circuit Operation
When the power switch is turned ON, power is supplied through DA501 to the RTC (inside IC501). At this time, the voltage at
pin 7 of the IC501 is +3.3V. When the power switch is turned OFF, the BATT supplies power to RTC through DA501. The
voltage at pin 7 of IC501 is about +2.5V. When the power switch is OFF and the voltage of +3.3V decreases, pin 7 of RTC
(IC501) becomes roughly the same voltage as the battery voltage. RTC goes into the backup mode, in which the power
consumption is lower.
150
KX-FP121AL / KX-FM131AL
Содержание KX-FM131AL
Страница 3: ...15 8 FIXTURES AND TOOLS 231 3 KX FP121AL KX FM131AL ...
Страница 9: ...1 11 ITU T No 1 Test Chart 9 KX FP121AL KX FM131AL ...
Страница 11: ...1 12 2 CONTROL PANEL 11 KX FP121AL KX FM131AL ...
Страница 13: ...1 13 1 Connecting to a computer KX FM131 ONLY 13 KX FP121AL KX FM131AL ...
Страница 18: ...1 14 7 ADDING PAPER TO THE PAPER TRAY 1 14 8 DOCUMENTS THE UNIT CAN FEED 18 KX FP121AL KX FM131AL ...
Страница 21: ...1 14 12 REPLACING THE FILM CARTRIDGE 21 KX FP121AL KX FM131AL ...
Страница 22: ...22 KX FP121AL KX FM131AL ...
Страница 29: ...Note The explanations given in the are for servicemen only 29 KX FP121AL KX FM131AL ...
Страница 33: ...2 3 3 TROUBLESHOOTING ITEMS TABLE 33 KX FP121AL KX FM131AL ...
Страница 34: ...2 3 3 1 Simple Check List 34 KX FP121AL KX FM131AL ...
Страница 36: ...2 Document JAM 36 KX FP121AL KX FM131AL ...
Страница 40: ...6 Paper JAM 7 Multiple feed and skew 40 KX FP121AL KX FM131AL ...
Страница 43: ...Fig C 12 A blank page is received 43 KX FP121AL KX FM131AL ...
Страница 47: ...2 3 3 3 1 Defective facsimile section 1 Transmit problem 47 KX FP121AL KX FM131AL ...
Страница 55: ...55 KX FP121AL KX FM131AL ...
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Страница 57: ...57 KX FP121AL KX FM131AL ...
Страница 58: ...58 KX FP121AL KX FM131AL ...
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Страница 61: ...61 KX FP121AL KX FM131AL ...
Страница 62: ...62 KX FP121AL KX FM131AL ...
Страница 70: ...I O and Pin No Diagram 70 KX FP121AL KX FM131AL ...
Страница 72: ...72 KX FP121AL KX FM131AL ...
Страница 74: ...NG Example 74 KX FP121AL KX FM131AL ...
Страница 75: ...2 3 3 4 2 Check the Status of the Digital Board 75 KX FP121AL KX FM131AL ...
Страница 76: ...2 3 3 4 3 RS 232C serial communication KX FM131 only 76 KX FP121AL KX FM131AL ...
Страница 77: ...77 KX FP121AL KX FM131AL ...
Страница 80: ...Note Inside the digital board 80 KX FP121AL KX FM131AL ...
Страница 83: ...Refer to 2 3 3 5 Analog Board Section 83 KX FP121AL KX FM131AL ...
Страница 85: ...2 Troubleshooting Flow Chart 85 KX FP121AL KX FM131AL ...
Страница 87: ...2 3 3 7 Operation Panel Section 1 No key operation 2 No LCD indication 87 KX FP121AL KX FM131AL ...
Страница 90: ...2 3 3 9 CIS Contact Image Sensor Section Refer to 6 4 4 SCANNING BLOCK 90 KX FP121AL KX FM131AL ...
Страница 91: ...91 KX FP121AL KX FM131AL ...
Страница 92: ...2 3 3 10 Thermal Head Section Refer to 6 4 3 THERMAL HEAD 92 KX FP121AL KX FM131AL ...
Страница 93: ...2 3 3 11 PANA LINK 93 KX FP121AL KX FM131AL ...
Страница 94: ...94 KX FP121AL KX FM131AL ...
Страница 95: ...95 KX FP121AL KX FM131AL ...
Страница 96: ...96 KX FP121AL KX FM131AL ...
Страница 97: ...97 KX FP121AL KX FM131AL ...
Страница 100: ...100 KX FP121AL KX FM131AL ...
Страница 114: ...2 4 7 3 PRINTOUT EXAMPLE 114 KX FP121AL KX FM131AL ...
Страница 115: ...115 KX FP121AL KX FM131AL ...
Страница 118: ...2 5 3 PRINT TEST PATTERN 1 Platen roller Reference pattern 118 KX FP121AL KX FM131AL ...
Страница 119: ...2 Left margin Top margin Reference pattern 119 KX FP121AL KX FM131AL ...
Страница 120: ...3 Thermal head 1 dot Reference pattern 120 KX FP121AL KX FM131AL ...
Страница 143: ...6 3 2 MEMORY MAP 143 KX FP121AL KX FM131AL ...
Страница 155: ...155 KX FP121AL KX FM131AL ...
Страница 165: ...6 4 6 3 2 Transmitting documents 6 4 6 3 3 Receiving FAX 165 KX FP121AL KX FM131AL ...
Страница 166: ...6 4 6 3 4 Copying 166 KX FP121AL KX FM131AL ...
Страница 176: ...b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format 176 KX FP121AL KX FM131AL ...
Страница 184: ...184 KX FP121AL KX FM131AL ...
Страница 190: ...190 KX FP121AL KX FM131AL ...
Страница 204: ...9 6 MEMO KX FP121AL KX FM131AL 204 ...
Страница 205: ...10 TERMINAL GUIDE OF THE IC S TRANSISTORS AND DIODES 205 KX FP121AL KX FM131AL ...
Страница 206: ...11 FIXTURES AND TOOLS 206 KX FP121AL KX FM131AL ...
Страница 207: ...12 CABINET MECHANICAL AND ELECTRICAL PARTS LOCATION 12 1 OPERATION PANEL SECTION 207 KX FP121AL KX FM131AL ...
Страница 208: ...12 2 UPPER CABINET SECTION 208 KX FP121AL KX FM131AL ...
Страница 209: ...12 2 1 PICK UP BASE SECTION 209 KX FP121AL KX FM131AL ...
Страница 210: ...12 3 LOWER CABINET P C B SECTION 210 KX FP121AL KX FM131AL ...
Страница 211: ...12 4 MOTOR SECTION 211 KX FP121AL KX FM131AL ...
Страница 212: ...12 5 ACTUAL SIZE OF SCREWS AND WASHER 212 KX FP121AL KX FM131AL ...
Страница 213: ...13 ACCESSORIES AND PACKING MATERIALS 213 KX FP121AL KX FM131AL ...