Lincoln Electric POWER WAVE SVM135-B Service Manual page 122

F-58
DUAL ENCODER PC BOARD TEST (continued)
1 2 3 4 5 6 78
J1
TEST PROCEDURE
1. Remove input power from control box
assembly.
2. Using the Phillips head screwdriver,
remove the display/encoder assembly
panel from the Control Box. Refer to
Figure F.15.
NOTE: The panel assembly cannot be
removed completely without removing the
lead plug from the control board. DO NOT
remove the lead plug.
3. Locate the dual encoder PC board and
plug J1. Also locate plug J4 on the
control board.
4. Apply the correct input power (from the
Power Wave 455 control cable) to the
Control Box.
5. Check for approximately 12 VDC from
plug J1 pin 2+ (lead 512C) to plug J1
pin 1 - (lead 500C). This is the supply
voltage from the control board to the
encoder board. If this voltage is miss-
ing, check the continuity of the leads
between the control board (J4) and the
encoder board (J1). See wiring dia-
gram. The control board may be faulty.
TROUBLESHOOTING AND REPAIR
FIGURE F.15 — DUAL ENCODER TEST.
DISPLAY
BOARD
POWER WAVE 455/POWER FEED 10
CONTROL
BOARD
8
9
10
11
12
13
14
6. While rotating the wire feed speed
(WFS) control check for a "pulsing" 0
to 5 VDC signal at plug J1 pin 5 + (lead
553) to J1 pin 1 - (lead 500C). Also
check for a "pulsing" 0 to 5 VDC signal
from plug J1 pin 6 + (lead 554) to J1 pin
1 - (lead 500C).
7. While rotating the volts/trim control
check for a "pulsing" 0 to 5 VDC signal
at plug J1 pin 3 + (lead 555) to J1 pin 1-
(lead 500C). Also check for a "pulsing"
0 to 5 VDC signal at plug J1 pin 4 +
(lead 556) to J1 pin 1 - (lead 500C).
8. If the 12 VDC supply in Step 5 is pre-
sent and any of the 0 to 5 VDC "puls-
ing"* signals are missing, the encoder
PC board may be faulty.
*"Pulsing" means that as the control is
rotated the signal will fluctuate from 0
to 5 VDC.
9. Remove input power to the control box
assembly.
10. Install the display/encoder assembly
panel into the Control Box.
F-58
1
2
3
4
5
6
7