Physiomed PHYSIOTHERM-S User manual

S E R V I C E M A N U A L

PHYSIOTHERM-S

Revision: 09 / 2008

Table of Contents

1 GENERAL			3
1.1	Packaging / Transport		4
1.1.1		Transporting the Unit	4
1.1.2		Unpacking the Unit	4
1.1.3		Packing the Unit	4
1.2	Notes on Safety		5
1.3	Service Principle		5

2 TECHNICAL DESCRIPTION		6
2.1	Technical Data	6
2.2	Circuit Description	7
2.3	Power Supply with PCB Input	7
2.4	PCB Power Supply	7
2.4.1 Power Setting – PCB Power Supply		9
2.5	HF Signal Generator	10
2.6	Preliminary Amplifier	10
2.7	Power Amplifier	10
2.8	Output Circuit	11
2.9	Operating Panel	11

3 MOUNTING AND DISMOUNTING ELEMENTS AND PARTS		12
3.1	Elements	12
3.2	Spare Parts	13
3.3	Opening and Closing the Unit	15
3.4	Exchanging PCB Controller, Display and Key Pad	16
3.5	Exchanging the Signal Generator and the Preliminary Amplifier	16
3.6	Exchanging the Power Amplifier	17
3.7	Exchanging the Output Circuit	17
3.8	Exchanging the Tuning Element	18
3.9	Exchanging the Power Switch	18

3.10	Exchanging the Power Supply	18
3.11	Exchanging the Anode/Control Transformer	19

4	SERVICE SETTINGS AND CHECKS		21
	4.1	The Service Menu	21
	4.1.1 Activating the Service Menu		21
	4.2	Manufacturer recommendations on safety inspections according to 93/42 EEC	22
	4.3	Visual Inspections and Function Checks	22
	4.4	Setting the Output Power (PCB power supply)	23
	4.5	Setting the Voltage of the Input Circuit	24
5	ERROR DIAGNOSIS PHYSIOTHERM-S		25

General

1 General

With PHYSIOTHERM-S you have acquired a high-quality and extremely versatile unit for short wave therapy. The most remarkable features of PHYSIOTHERM-S are its convenient operation and modern design as well as its easy maintenance and servicing and high degree of reliability.

The integrated safety functions for improving patient safety more than fulfill legal requirements. The unit is CE-labelled and thus meets the basic requirements laid down in the EC regulations for medical products.

Please note that this Service Manual was established on the basis of the Operating Instructions. Important notes on handling and operating the unit are contained in the Operating Instructions.

If your PHYSIOTHERM-S is in need of service, please contact:

PHYSIOMED ELEKTROMEDIZIN AG

Hutweide 10

D-91220 Schnaittach / Laipersdorf (Germany)

Phone [phone]

Fax [phone]

In case of technical problems or if you have technical questions, please contact your local distributor or the address mentioned above.

The unit may only be maintained by PHYSIOMED ELEKTROMEDIZIN AG or an authorized dealer.

If you ever need to return the unit to your dealer or to PHYSIOMED ELEKTROMEDIZIN AG, the original packaging needs to be used. The following information needs to be included:

•owner's name and address

•serial and device number

•description of the error (including error code)

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3

General

1.1 Packaging / Transport

1.1.1Transporting the Unit

In order to ensure save transportation of PHYSIOTHERM-S, the original packaging should be used for transportation. This particular packaging offers the protection required for the transport of the unit in an upright position. Protection is not ensured for flat transportation, which may result in the unit being damaged and impaired in its function.

The authorized dealer or the owner is responsible for proper packaging and needs to ensure that all safety and accident prevention requirements are met.

1.1.2Unpacking the Unit

The unit is generally delivered with the packaging material supplied by the manufacturer. Since the unit's weight is about 60 kg, it must be unpacked by at least two people!

Proceed as follows:

•Position the transport packaging so that the UP mark is pointing upward.

•Remove the safety straps from the transport packaging.

•Lift the upper part of the transport packaging and remove it from the unit.

•Remove the top part of the foam material.

•Lift (at least two people) the unit from the lower part of the packaging.

1.1.3Packing the Unit

The unit should always be transported in its original packaging. Since the unit's weight is about 60 kg, it must be packed by at least two people!

Proceed as follows:

•Bend down both electrode arms.

•Affix the lower part of the transport packaging to the pallet.

•Place the bottom part of the foam material into the lower part of the transport packaging, the square cut-out facing up.

•Put the unit into the square cut-out (at least two people are required!) of the bottom part of the foam material.

•Pack all accessories separately. They may be placed in the space left by the unit (between the case and the operating panel) and shipped within the transport packaging.

•Place the protective cover (if available) over the unit.

•Now place the top part of the foam material over the unit.

•Put the upper part of the transport packaging over the unit packed in the foam material and slide it over the lower part of the packaging.

•Secure the complete packaging (upper + lower part of packaging + pallet) with safety straps.

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General

1.2 Notes on Safety

Some parts within the unit are directly connected to the electric supply system. For some service work it may be required to operate PHYSIOTHERM-S while the unit is open and conduct measurements and settings. For this purpose, the usual safety regulations for preventing electric shock need to be observed.

During operation, voltages of up to several thousand volts are produced in the electric wiring system and the high frequency generator. In particular, the high-voltage supply unit, the tube power amplifier and the transformers may carry currents against electric earth that could result in electric shock.

For use of this Service Manual, knowledge of the Operating Instructions is required.

1.3 Service Principle

PHYSIOTHERM-S is of a modular design. All parts can be mounted and dismounted quickly. Electric and electronic modules are plugged in so that no soldering is required. In case an error occurs on a board or a module it will be replaced for a replacement charge, since repair of a board is usually not practicable on site. Repair is carried out at the manufacturer, if feasible. For this reason, no circuit diagrams of the modules are included in this Service Manual.

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Technical Description

2 Technical Description

2.1 Technical Data

Mains connection	115 V / 230 V; 50-60 Hz
	set by voltage selector (anode and control transformer)
	within the unit
Power line input	without HF output		approx. 200 VA
	with maximum output		approx. 1400 VA
Line fuse (unit)	16 A (115V)	8 A (230V)
Protection class	I
Class acc. to EC 93/42	IIa
Type	BF
HF nominal power	1000 W pulsed mode (at pulse peak)
	400 W continuous mode
Power setting	10 W increments (CW mode)
	50 W increments (pulsed mode)
Power indication	Amplitude and effective power
Working frequency	27.12 MHz +/- 0.6 %
Pulse duration	200 - 600 μs
Pulse frequency	10 - 300 Hz
Treatment duration	1 - 60 min
Design	IEC 601-1, IEC 601-2-3, IEC 601-1-2
Weight	approx. 60 kg
Dimensions in mm	420 x 970 x 405 (W x H x D)
	conforms to European Council Directive concerning medical
	devices 93/42 EEC

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Technical Description

2.2 Circuit Description

The electric components of PHYSIOTHERM-S are located beneath the covering plate (operating panel) and on the boards for power supply; preliminary amplifier and signal generator are located behind the casing cover. The boards and all other electric components are connected via a plug connection and flat strip wires. The following functional blocks may be distinguished according to the block diagram on the following page.

2.3 Power Supply with PCB Input

Power is supplied via the mains supply. The supply voltage is directed to the power switch on the left side of the unit via the PCB input (X1).

Power is supplied via the PCB input to the no-heating appliance plug, the power switch and the anode and control transformers.

The voltage selectors for 115 V or 230 V operation are placed in sockets X10 and X3.

Current limitation control transformer: via NTC resistor R12

Current limitation anode transformer: via resistor R1/R2 and relay K1. After current limitation, the resistors are bridged by the switching contacts of relay K1. The LED V3 indicates that the relay K1 has been activated.

Switching anode voltage: via the relay K2 on the primary side of the anode transformer. The LED V4 indicates that the relay K2 has been activated. The relay is controlled by the power supply via the terminal X9.

The anode transformer is connected to the terminals X7 and X8. The thermal switches of the anode and control transformers are connected to the terminals X7 and X8.

2.4 PCB Power Supply

The high voltage generated by the anode transformer is supplied via the terminals X3 and X5.

In the lower range of performance (up to 280 W), the voltage amounts to 700 V AC, and to 1000 V AC in the upper range of performance (above 280 W).

High voltage is rectified, smoothed and increased by the factor 2.5.

Rectified high voltage in the lower range of performance: approx. 1,750 V DC (700 V x 2.5)

Rectified high voltage in the upper range of performance: approx. 2,500 V DC (1,000 V x 2.5)

The PCB power supply generates the grid voltage required for setting the operating point of the tube.

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Technical Description

The PCB power supply also generates the rectified and stabilised supply voltages of 5 V, +/- 15 V, + 24 V and the unstabilised voltage of 50 V. These voltages are required for operating the individual modules.

Supply voltages at terminal strip X4 (HF power output 0 Watt / cont.)

Pin	Measuring point	LED	Voltage
(terminal strip)
1	MPP5VDC-A	-	4.8 V-5.2 V
2	MPP5VDC-AS	-	4.8 V-5.2 V
3	MPP5VDC-B	B3	4.8 V-5.2 V
4	MPP15VDC	B4	14.4 V-15.6 V
5	MPM15VDC	B5	-14.4 V-(-15.6 V)
6	MPP24VDC	B4	23 V-25 V
7	Earth	-	0 V
8	free	-	-
9	MPP50VDC	B4	49 V-55 V
10	Earth	-	0 V

Grid current measuring point at terminal strip X1 (HF power output 400 Watt / cont.)

Pin	Measuring point	Voltage
(terminal strip)
1	Earth	0 V
2	MPIG-A	0-100 mV
3	free	-
4	MPIG-B	0-100 mV
5	Earth	0 V

Measured with voltmeter between PIN2 and PIN4 (1 mV corresponds to 1 mA)

Anode current measuring point at terminal strip X2 (HF power output 400 Watt / cont.)

Pin	Measuring point	Voltage
(terminal strip)
1	Earth	0 V
2	MPIA-A	0-400 mV
3	free	-------
4	MPIA-B	0-400 mV
5	Earth	0V

Measured with voltmeter between PIN2 and PIN4 (1 mV corresponds to 1 mA)

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