Hypertherm PMX1000 Referenzhandbuch

PMX1000 & PMX1250

RCD Resistor Replacement

Field Service Bulletin

804950 – Revision 2 – July, 2017

Hypertherm Inc.

Etna Road, P.O. Box 5010

Hanover, NH 03755 USA

603-643-3441 Tel 603-643-5352 Fax

www.hypertherm.com

RCD RESISTOR REPLACEMENT

Field Service Bulletin 1

Introduction

Purpose

Describes necessary steps to replace the RCD resistors (R119 and R120) on the power board of the PMX1000 and

PMX1250.

Note: This upgrade only applies to power supplies with serial numbers prior to:

PMX1000 – 1000-013717

PMX1250 – 1250-007888

Tools Needed

Phillips head screwdriver

Wire cutters

Kit Contents

Item Part Number Description Qty

1 109529 24K 13W resistor 2

WARNING

ELECTRIC SHOCK CAN KILL

Disconnect electrical power before performing any maintenance.

All work requiring removal of the power supply cover must be performed by a

qualified technician.

See Section 1 of the Operator Manual for more safety precautions.

RCD RESISTOR REPLACEMENT

Field Service Bulletin 2

Replace damaged resistors

1. Disconnect power and remove cover from power supply.

2. Discharge capacitors C94 and C98. See photo below.

3. Use wire cutters to remove resistors R119 and R120.

Note: cut leads next to the surface of the power board.

WARNING

ELECTRIC SHOCK CAN KILL

Use a multi-meter in VDC mode to discharge the capacitors to

less than 10VDC before removing the mounting screws.

Cut 4 places as shown

C98

C94

C98

C94

4. Remove screws from capacitors C94 and C98 as show.

R119

R120

Resistor (2)

Field Service Bulletin 3

Correct Installation

5. Install new resistors on capacitors C94 and C98 as shown. Tighten screws to 20 inch pounds (24 kg cm).

Note: Align bleeder hole on capacitor with view hole on power board.

6. Install power supply cover.

Bleeder hole

View hole (2)

Torque screws (4) to

20 inch pounds (24 kg cm)

CAUTION: Cross-threading the screws may cause

the capacitors to fail.

Note: assemble in the following order.

PCB, resistor, large terminal, small terminal, screw

C94

C98

Hypertherm and Powermax are trademarks of Hypertherm Inc.

and may be registered in the United States and/or other countries.

RCD RESISTOR REPLACEMENT

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