HindlePower AT30 SERIES Operating And Service Instructions page 67

Replacing resistors (R3, R4, R6 or R14) on Gate Driver PC Board (A15)
In all AT30s, resistors R4, R6, and R14 are soldered directly onto the Gate
Driver PC Board (A15). For 12 Vdc and 24 Vdc AT30s, R3 is also
soldered directly onto A15. For proper location see the figure below.
If any of these resistors need to be replaced, we suggest ordering a new
Gate Driver PC Board (A15). See Replacing the Main Control PC Board
(A1) and/or Gate Driver PC Board (A15) on page 59.
If any of these resistors must be replaced without replacing A15, select the
proper part number listed in the table starting on page 62 and order it from
the factory or your sales representative.
Remove A15 as described on page 59. Using wire cutters, clip the
soldered leads of the old resistor and remove it from A15. Carefully
solder on the new resistor, making sure not to damage any other
components on A15. Polarity is not vital for these resistors. Once the
solder cools, replace A15 as described on page 59.
Replacing the power supply resistor (R3) - 48 and 130 Vdc units only
In 48 Vdc and 130 Vdc AT30s, R3 is mounted with metal brackets onto
the back panel of the enclosure, not on the A15 pc board.
Cut wires # 49 and # 51, connected to R3, as close to the resistor leads as
possible. Strip off 0.25in / 6.4mm of insulation from the cut ends of the
wires. Unscrew the top mounting bracket and remove the existing
resistor. Mount the replacement R3 resistor and attach the top mounting
bracket. Polarity is not vital. Carefully re-solder the cut wires to R3.
For further information, refer to Service Instruction (JD5010-00).
SERVICING THE AT30
61