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AIWA CTX418
Service Manual


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

Description of AIWA CTX418 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 13 (click to view)
Pin No.

Pin Name

1/0 Programmable

Description counter input in the AM band. The PLL command switches between

the direct division method (LF mode) and pulse swallow method (HF mode). With the direct division method, the 0.5-20MHz (0.3Vp-p min.) local oscillation output (VCO output) is input; with thepulse 52 AMIN I oscillation output (VCO output) is input. An input amp is built in, and C-coupling. small-amplitude operation is performed. swallow method, the l-40MHz (0.3 Vp-pmin.) local

Note: If the all the reference internal ports (4 bits) are set to “1”, or FMH mode or FML mode is set, the input is pulled down. Power input. When PLL is operating, 5 V * 10% is applied. The voltage can be dropped to 2 V in the backup status (when the CKSTP command is being executed). If the voltage drops below 3.5 V when the CPU is operating, the CPU will stop to prevent malfunctions. 53 VDD . initialized and the clock corrected by program as required. When the voltage O+ 3.5 V is applied to this pin, the system reset signal will be supplied to the device, and the program will start from address O. Note: Set the rise time of the device supply voltage between 10-100 ms because of the power on reset operation. (See note 1) 54 GND 1 . Ground of the CPU and logic block For the connection of a 7.2MHz crystal oscillator. Adjust the oscillation frequency 55,56 XT, XT (7.2MHz), observing the LCD segment waveforms. The oscillator stops automatically when the CKSTP command is executed. 4-bit (P5- 1- P5-4) I/O port. This port can designate inputs and outputs for every bit: 57-60 P5-1 - P5-4 Ilo the designation is executed by the contents of the internal port called PORT-5 I/O CONTROL. (See notes 1-3) When the voltage rises to more than 3.5 V, the CPU will restart.

This status (Wait mode) can be detected by the Wait F/F bit, so the CPU should be

Note 1: When a reset signal (VDD = O+ 3.5V and INI = “L” + “H”) is input to the device, the I/O ports will be set to inputs, the
common pins of I/O ports and AD/DA converters will be set to inputs of I/O ports, the common pins of I/O ports and serial UO ports will be set to inputs of I/O ports, and the common pins of IF counter inputs and I/O ports will be set to IF counter inputs. Note 2: When the CKSTP command is executed, all outputs of the output ports and I/O ports will be set to “L”. Note 3: When the device is reset, the contents of output ports and internal ports are uncertain, so the device should be initialized by program as required.

17

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