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CASIO LX-522
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of CASIO LX-522 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 12 (click to view)
Power supply circuit
1) Power supply circuit for CPU, GATE ARRAY and RAMs.
When the main batteries are set, the voltage (9V) is applied to the terminal VDD1 of CPU (LSI1), GATE ARRAY (LSI2) and RAM (LSI4). When IC2 receives the voltage, it provides 4V to the GND lines from the terminal OUT (Pin No.1).

2)

Main switch
The CPU (LSI1) detects the informations of the Main switch by the terminal SW (Pin No.36) from the SWO signal of the GATE ARRAY (LSI2).

3)

How to turn the display ON.
When pressing "ON" key under the ON side of the Main switch , the CPU (LSI1) generates the signal to turn the display ON on the terminal V2ON (Pin No.45). This signal goes to the terminal VIN (Pin No.24) of the GATE ARRAY (LSI2), then the GATE ARRAY (LSI2) generates "L" level on the terminal VOB (Pin No.28). When the transistor 2SA1179 (Q2) receives "L" level, the transistor 2SC2812 (Q1) will be also turned ON. Then LCD drive voltage V1~V4 will be applied.

4)

How to detect the voltage for the main batteries.
When the voltage of the VDD lines becomes +6.6V±0.18V, the terminal OUT (Pin No.1) of the detector RH5V60BA (IC4) becomes "L" level, then this signal goes to the terminal INTO (Pin No.70) of the CPU (LSI1) and the terminal PDN (Pin No.35) of the GATE ARRAY (LSI2). The CPU detects the low battery condition, then the display turns OFF.

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