Enraf Nonius 1403773, Service Manual

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Enraf-Nonius B.V. Curapuls 670 Service Manual 1403773
Description June 1997 2-1
2 DESCRIPTION
Because of the modular construction of the Curapuls 670 the description is done in
module level. The modules can be found in the block diagram.
2.1 BLOCK DIAGRAM (see appendix B fig. 1)
The electronic circuit of the Curapuls 670 is located on 2 modules:
- Application module HF. (also referred to as main PC Board).
- User interface module (also referred to as user interface PC Board) including LCD
parameter display with backlighting.
Input power and output power devices:
- Mains supply circuit
- Circuplode(s)
2.1.1 Application module HF. (main PC Board)
The function of the application module is to generate the shortwave output power as
specified for the Curapuls 670.
The application module comprises the following circuits:
- AC/DC power supply circuits.
- Fuses
- Processor circuits ( P)
- Program memory
- Analogue to digital (AD) and digital to analogue (DA) converters
- Timer circuits,
- VCO circuit
- Measuring circuits
- Monitoring/safety circuits.
- Driver and output stages
Description of the application module:
The functions of the Curapuls 670 are controlled by the microprocessor ( P). The P
gathers information about connected electrodes (which type, which channel) and about
the set parameters (pulse duration, pulse frequency, treatment time, intensity etc.). The
software used for these functions is stored in EPROM. Timer circuits are used for
generating treatment parameters and for measuring the output signals. Safety circuits
are applied for checking the safe operation of the Curapuls 670, also is checked that
the output does not exceed maximum values. All signals are generated by the
P and
converted by a DA converter to analogue signals. These signals are measured and
converted by a AD converter. This signal is fed back to the
P for comparison with the
set parameters and the output is corrected if necessary. The Voltage Controlled
Oscillator (VCO) is also checked for the output frequency which is 27.12 MHz (±0.6%).
The driver and output stages generate the output as specified for the Curapuls 670.