Replacing The Varistor On The Pc Board; Replacing The Varistor On The Pc Board - Respironics REMstar Choice Service Manual

Repair and Replacement
6.5.2.1 REPLACING THE VARISTOR
ON THE PC BOARD
Part #502190
Included with the Replacement Kit:
• Varistor
Additional Supplies Required:
• Phillips Screwdriver
• Slotted Screwdriver (smaller than 1/8")
• Six-pin Jumper* (Used for REMstar Choice LS repair only)
• Vacuum type desoldering tool
• Solder: "44" Rosin Core (60% tin; 40% Lead)
• Soldering Iron with temperature control
WARNING: Electrical Shock Hazard: Disconnect the electrical supply before making repairs to the unit.
CAUTION: Electronic components used in this unit are subject to damage by static electricity. Use proper
static discharge and grounding precautions when servicing the equipment.
NOTE: Before attempting this repair, check that the PC board is not damaged (i.e., no burn marks,
solder pads are not lifted, no other components are damaged).
STEP 1 Desolder the Varistor, either VR1 or RV1
(both are located in the same place on the
PC board) and remove.
NOTE: If the PC board is damaged during
the removal process, discard and
replace with a new PC board.
STEP 2 Orient and fit the new varistor into the
PC board.
STEP 3 Solder the varistor to the PC board
(the heat setting of the soldering iron must
not exceed 675° Fahrenheit).
6-20
*Retained from old LS Board
Ramp Adjust. CB/
Time Meter
Connector
(8 Pin)
J4
Power Switch
Connector
(2 Pin)
Motor
Connector
J1
(8 Pin)
J2
DC Inlet
Wires
(2 Pin)
Transformer
Wires
(4 Pin)
REMstar Service Manual
VR1 or RV1
(PLD Boards are
RV1 and other
boards are VR1)