8/13/2019 Servicio tcnico STAC100 (Ingls)

1/4

Page 1 of 4 ISSUE 1-0

Buckleys (UVRAL) Ltd

Beta Works, Range Road, Hythe, Kent. CT21 6HG. UK

- + - +

SERVICING INSTRUCTIONS

ST-AC 100

ALL WORK SHOULD BE PERFORMED BY QUALIFIED PERSONS.

WORKING ON THE UNIT WHILE IT IS CONNECTED TO A MAINS SUPPLY SHOULDBE AVOIDED.

Test equipment required:

- Isolated Mains A.C. power supply.

- Portable Appliance Tester.

- Digital Multimeter.

- Tools, Standard Electronic Servicing.

1. PLEASE REFER TO THE CIRCUIT DIAGRAM. The ST-AC 100 spark tester can be

divided into three sections:

A. - Filter PCB including mains Transformer (TRN1) and On/Off Switch (SW1)

B. - Main Control PCB including Output Control (VR2)C. - Test Probe Handle lead, Handle PCB and Nose Cone.

2. Complete a visual inspection of the ST-AC 100 checking for signs of damage, paying

particular attention to the Mains lead, Handle lead and Nose Cone.

3. Remove the front and rear grey plastic case bezels, undo the top 2 case screws from the front

and rear panels. Using a large flat bladed screwdriver gently prise the lid from the case and

check for internal damage. Ensuring that there are no loose wires, or damaged components.

4. Check continuity of the Mains lead, Filter PCB (including fuses F1 & F2) and the internal

wiring. Check the control PCB looking for any damaged, broken or burnt components.

Component values can be checked using a standard digital multimeter.

5. Remove the Nose Cone by first loosening the 2 grub screws in the Nose Cone Locking

Ring and then un-screw the Locking Ring itself. Check for signs of excessive oil around the

3 brass pins in the Nose Cone base.

6. Locate and remove the 4 retaining screws from the Nose Cone socket (in the Test Probe

Handle), loosen the cable gland at the rear of the Test Probe Handle and carefully push theHandle cable/PCB assembly out from inside the Handle.

7. Check continuity of the 4 Handle wires and the condition of the Handle PCB.

NEVER OPERATE THE ST-AC 100 WITH ITS NOSE CONE DISCONNECTED.

8/13/2019 Servicio tcnico STAC100 (Ingls)

2/4

Page 2 of 4 ISSUE 1-0

Buckleys (UVRAL) Ltd

Beta Works, Range Road, Hythe, Kent. CT21 6HG. UK

- + - +

8. The most common faults that have shown over a period of time are-

TR1 - Handle PCB, Short Circuit.

R4 - Control PCB, Open Circuit. Usually due to TR1 (Handle PCB) being short.

Open Circuit Handle Lead, normally at the cable gland entry points.

Nose Cone, Open Circuit.

9. Should it be necessary to take voltage readings, the ST-AC 100 MUSTbe connected to amains Isolated A.C Supply to ensure safety. Replace any faulty/damaged components with

components of identical specification.

10. Following repair, but before re-commissioning of the ST-AC 100, it is important to carry

out an electrical safety check on the ST-AC 100 using a suitable Portable Appliance Tester.

This is to ensure that it is safe for the operator(s) to use. A record of the repair work and test

results should be provided.

8/13/2019 Servicio tcnico STAC100 (Ingls)

3/4

Page 3 of 4 ISSUE 1-0

Buckleys (UVRAL) Ltd

Beta Works, Range Road, Hythe, Kent. CT21 6HG. UK

- + - +

8/13/2019 Servicio tcnico STAC100 (Ingls)

4/4

Page 4 of 4 ISSUE 1-0

Buckleys (UVRAL) Ltd

Beta Works, Range Road, Hythe, Kent. CT21 6HG. UK

- + - +

Parts List For Main STAC PCB

QTY PARTNUMBER DESCRIPTION REFERENCE1 C0183 0.15uF X2 SUPP CAPACITOR C1

1 C0510 10n POLYESTER CAPACITOR C4

1 C0585 0.47uf 400V DC PMR METALISED CAP C21 C0680 10uf 100V RADIAL CAPACITOR C3

1 C1062 CHOKE 2 AMP (SMV 20) L12 D0100 DIODE UF4002 100V D1-21 D0240 BZX79 6V2 ZENER ZD2

1 D0420 DIODE 1N5346B 9v1 ZENER ZD1

1 P0595 3/8"sq. 0.5W 1K M/T POT. VR1

1 R0180 10K METAL FILM 0.25W 1% RESISTOR R2

1 R0230 1K2 METAL FILM 0.25W 1% RESISTOR R5

1 R0305 1M5 0.5W RESISTOR 5% R1

1 R0370 220 OHM METL FILM 0.25W 1% RESISTOR R3

1 R0490 33K METAL FILM 0.25W 1% RESISTOR R41 T0310 BC327 (PNP) TRANSISTOR T1

1 T0340 BC337 (NPN) TRANSISTOR T2

Parts List For Handle PCB

QTY PARTNUMBER DESCRIPTION REFERENCE3 C0585 0.47uf 400V DC PMR METALISED CAP C1,C5,C61 D0310 IN5408 3A 1000V DIODE D3

1 T0400 THYRISTOR BT152-600R TR1

Parts List For Filter PCB

QTY PARTNUMBER DESCRIPTION REFERENCE4 B0410 BRASS BUSH FOR FILTER

2 C0185 CAP.250V AC .0022UF CLASS Y CERAMIC C3, C4

2 C0513 0.1uF CLASS X2 POLY.CAP C1, C2

1 C1060 CHOKE 0.4 AMP CH1

1 C2110 CONNECTOR-STRAIGHT 3 WAY

1 C2185 IEC TWIN FUSED PLUG COVER1 P0475 TWIN FUSED CHASSIS PLUG

1 R0650 560K METAL FILM 0.25W 1% RESISTOR R1