Dr. Oppel (ST-501)
Service Manual
s^metech
.5У www.sometech.com
Contents
1.	Name & Function of parts....2-5
2.	BLOCK DIAGRAM	........6
3.	Tips for BLOCK DIAGRAM......7
4.	CIRCUIT DIAGRAM	.......8
5.	Output power of each stage..9
6.	TROUBLESHOOTING ............10-12
7.	PART LIST	........13-15
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1. Name and function of parts
- Summary
- Dr. Oppel(ST-501) is a surgical unit to cut and coagulate the affected part using High Frequency.
-Appearance and Structure
1) Appearance
(A) Picture
[Appearance of main body]
3
(В) Description
9	10	8 11	1
0 7	5	4 3	2
[Front View]
No.	Name	Function
1	Power switch	ON/OFF mode by pressing the switch and the lamp inside the switch turns on at ON mode.
2	Foot switch	A female jack to connect a foot switch.
3	Alarm lamp	In case the patient plate is separated or cut from the connector, or there is something wrong with the monitor circuit of the patient plate, the lamp turns on with alarm.
4	Patient plate connector	A female jack for the patient plate.
5	Monopolar connector	A female jack for Monopolar.
6	Bipolar connector	A female jack for Bipolar.
7	Bipolar/Monopolar optional switch	You can turn this switch to the left for Bipolar and to the right for Monopolar.
8	Output power controlling knob	You can turn this knob to the right for power increase and to the left for power decrease.
9	Indication lamp for output power time	Each lamp turns on when you choose time for output power.
10	Optional switch for output power	You can choose time for output power
11	Output power indicator	The lamp turns on when output power is generated.
4
12
13
[Side View]
No.	Name	Function
12	Heat emitting hole	To emit heat generated in the main unit to the outside.
13	Rubber foot	To secure safety and insulation in using the main unit.
5
14	15
16
[Back View]
No.	Name	Function
14	Fuse box	To protect the main body from over voltage and over electric current.
15	Beeping sound controlling switch	To control the level of beeping sound (more than 65dB) when output power is generated
16	Power switch input socket	To insert the input power cord.
6
2. [BLOCK DIAGRAM]
Input power
220VAC / 60Hz (110VAC /50HZ, 60HZ)
[BLOCK DIAGRAM]
7
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3.	Explanation of BLOCK DIAGRAM
(1)	By using high frequency current controlled from Input power, it does not give micro shock
of direct current or low frequency current to human body. In other word, it cut, coagulate
and stop bleeding by directly using the current without giving electric shock to human body.
(2)	High frequency departure circuit is convertible between monopolar and bipolar. The high
frequency starts from high frequency departure circuit operated by vacuum tube, then goes
to output power circuit by resonance coupling of C and L.
(3)	This surgical unit maintains stable cut and coagulation performance though the shape of
active electrodes are changed because the departure circuit reacts delicately to the change
of tissue of human body.
(4)	This surgical unit modulates 6.15MHz sign wave of departure high frequency by half cycle
input frequency (60Hz) modulation. The frequency is modulated to 60Hz in so called
incision wave so that the frequency becomes a middle wave of incision and coagulation and
the out power becomes 130W. Therefore, once setting output power control, it is possible
to cut and coagulation by only change active electrode without resetting output power
control.
8
4. [CIRCUIT DIAGRAM]
9
5. Output power for each stage (VR : 30kQ)
Test Equipment : TEKTRONIX TDS 430
		0	1	2	3	4	5	6	7	8	9	10
	Peak to peak (P.P.)	0	5.78w	98w	224.7w	386.4w	544.5w	616.5W	626.6w	655w	699.4w	729.6w
	Route mean square (R.M.S.)	0	0.73w	11.61W	24.6w	43w	62.3w	78.8w	80.4w	81.3w	82.7w	83.5w
BIP		0	1	2	3	4	5	6	7	8	9	10
	Peak to peak (P.P.)	0	3.92w	61.6w	149.6w	231.Iw	266.8w	295.2W	315w	325.12w	340.6w	356.4w
	Route mean square (R.M.S.)	0	0.36w	6.84w	17.52w	25.2w	28. Iw	29.64w	3081w	32.4w	33.4w	35.19w
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6. [TROUBLESHOOTING]
l.In case the high frequency cannot be produced
1)	Check if the input power cord connects properly.
2)	Check if the power switch turns on or not.
3)	Check if the output power volume stands at 0 - If the output power volume
stands at 0, no output power can be produced.
4)	Check if the connection among the device, patient plate, hand prove, and foot
switch is properly made.
5)	Check if the connection between hand prove and Electrode (Monopolar or
Bipolar) is properly made.
6)	Check if you set up the switch as either Monopolar mode or Bipolar without fail
for your proper use.
-Turning to the Bipolar mode, you cannot produce output power in the Monopolar
terminal.
7)	Check if you set up the output power timer properly.
-In case you set up the timer as 1/8 second you could misunderstand that
no output power is produced.
8)	Check if the fuse is off.
2.1n case beeping sound of output power cannot be produced
-Check if the beeping sound controlling volume at the rear of the device turns on.
3.1n case the timer change switch doesn’t work
-Check if you change the timer switch with Foot Switch pressed.
(You cannot change the timer when you are pressing Foot Switch (Power -On
mode), even thought you press the timer switch.
*If there are other problems which are not mentioned above, please do not
hesitate to contact us.
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4.	How to change the vacuum electronic tube
1)	Release all the screws and take the upper case out.
2)	Be loosened the screw of the silicon wire and take the wire apart from the vacuum tube as
picture A and B.
A.	В
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3)	Take the vacuum electronic tube out. and replace the new vacuum tube into white circle of
picture C above.
4)	Assemble in the reverse order.
5.	How to change fuse (250V, 5A)
1)	Release A by turning to the left (with pushing slightly) using ' - ' driver.
2)	Take out two of fuse
3)	Put the two new fuses into the proper position.
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7. [PART LIST]
	No	Description	standard	Quantity
main body	1	Front Panel Ass’y		
	2	Light Holder	LD-5 110V	1
	3	Rotary S/W	з<а 3#	1
	4	VR	6W 30КП 25S	1
	5	Illuminated S/W	31-282-015	1
	6	Jump Nut Receptacle	M16-3P	li
	7	Circular Connector	DIN-4S	1^
	8	Jack	JB-601	2
	9	Microphone Jack	MONO	1
	10	Selector S/W	SRF-114	1
	11	Out put power indication lamp	PP-12	
	12	Rear Panel Ass’y		
	13	EMI Filter	ID-0642-S	1
	14	Fuse Holder	R3-9	2
	15	Fuse	250V AC/5A	2
	16	Main Board Ass’y		
	17	Trans Main	Iron core 96mm	1
	18	Trans Heater	Iron core 66mm	1
	19	Departure coil		1
	20	High frequency chalk coil		1
	21	Vacuum tube	6KG6/EL509	1
	22	Vacuum tube socket	NL91129	1
	23	Vacuum tube CAP		1
	24	Resistor W/W	5W2KO	1
	25	Resistor W/W	5W100Q	1
	26	Resistor W/W	5W10KQ	1
	27	Cap-M/F	2J 104	1
	28	Cap-Ceramic	15KV 102	6
	29	Cap-Ceramic	4KV 200pF	1
	30	Cap-titanium	RE-40 lOOpF	1
	31	Cap-titanium	RE-40 500pF	1
	32	Cap-M/F	AC250V 0.22uF	1
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	33	Relay	MY2-AC6V	1
main body	34	RELAY socket	ML2	1
	35	Relay	G4W-22129-US-TV5	1
	36	Fan	DC 12V 60mm	1
	37	Bracket	“~i” Bracket	1
	38	Fan Bracket		1
	39	Trans Bracket		1
	40	Relay Bracket		1
	41	Spacing bar	5mm	2
	42	Spacing bar	10mm	2
	43	Spacing bar	35mm	4
	44	Ring terminal		3
	45	Wire (high voltage)	450mm	
	46	Wire	1007 AWG 18 1000mm	
	47	Wire	1015 AWG 18 500mm	
	48	PCB	FR4-2oz 3.2t 230x210	1
	49	PCB	FR4-2oz 1.6t 85x80	1
	50	PCB	FR4-2oz 1.6t 40x20	1
	51	PCB	FR4-2oz 1.6t 70x20	1
	52	VR	500П GF06P	1
	53	Diode-Bridge	W02G	1
	54	Buzzer	CM 1206	1
	55	Cap- Electrolytic	25V lOOOuF SMS	1
	56	Cap-Electrolytic	25V 470uF	1
	57	Cap-Ceramic	50V104	1
	58	Picking Coil	222	2
	59	Diode	1N4004	2
	60	Res-Carbon	1/2 W 10Q	1
	61	Res-Carbon	1/4 W 1.2KQ	1
	62	Res-Carbon	1/4W 220Q	1
	63	Relay	G6A-2742P	1
	64	Relay	DS2Y-5V	1
	65	Regulator	7805	1
	66	IC-CPU	89C1051	1
	67	IC-Reset	DS1232	1
	68	TR	A733YC	1
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