Lincoln Na5 Service Manual

NA-5F-38
TROUBLESHOOTING & REPAIRF-38
TEST DESCRIPTION
This will help determine if the power and logic boards are supplying the\
 correct DC voltages
to the NA-5 circuitry.
MATERIALS NEEDED
5/16 Nutdriver
Volt/Ohmmeter (Multimeter)
Wiring diagram
DC POWER SUPPLY TEST 
Service and repair should be performed only by Lincoln Electric factory trained per-
sonnel. Unauthorized repairs performed on this equipment could result in danger to
the technician or the machine operator and will invalidate your factory...

F-39TROUBLESHOOTING & REPAIRF-39
TEST PROCEDURE
1.  Remove input power to the NA-5.
2.  Using the 5/16 nutdriver open thecontrol box PC board access door.
3.  Locate the power, logic, voltage, control and procedure boards.  See
Figure F.1
4.  Apply 115VAC to the NA-5  wire feeder at the correct pins.  See
wiring diagram. 5.  Perform the power supply checks as
described in Table F.1  If any of the
readings are incorrect (out of range)
or missing the power or logic board
may be faulty.  See wiring...

F-40TROUBLESHOOTING & REPAIRF-40
CHECK POINT TEST CONNECTOR LEAD NO. NORMAL
LOCATION DESCRIPTION PLUG PIN NO. ACCEPTABLE  VOLTAGE READING
CONTROL PC  CHECK +15VDC PIN 10 +525 + 14.0 - 16.0 VDC
BOARD  SUPPLY FROM PIN 9 -510 -
CONNECTOR POWER BOARD
PLUG TO
CONTROL BOARD
VOLTAGE PC  CHECK +15VDC PIN 3 +525 + 14.0 - 16.0 VDC
BOARD 12 PIN  SUPPLY FROM  PIN 7 -510 -
CONNECTOR POWER BOARD
PLUG TO
VOLTAGE BOARD
VOLTAGE PC  CHECK -10VDC PIN 6 -500 - 9.0 - 11.0 VDC
BOARD 12 PIN  SUPPLY FROM PIN 7+510 +
CONNECTOR...

F-41TROUBLESHOOTING & REPAIRF-41
DC POWER SUPPLY TEST (continued)
NA-5
CHECK POINT  TEST  CONNECTOR LEAD NO. NORMAL
LOCATION DESCRIPTION PLUG PIN NO. ACCEPTABLE 
VOLTAGE READING
PROCEDURE  CHECK +15VDC PLUG J19 515 +
PC BOARD  SUPPLY FROM PIN 5 +
J19 CONNECTOR  LOGIC BOARD 14.0 - 16.0 VDC
PLUG  TOPLUG J19 500 -
PROCEDURE BOARD  PIN 15 - 
VOLTMETER   CHECK +5VDC TEST POINT
1.TP5 +
BOARD SUPPLY TP5 + PRODUCED 4.75 - 5.25 VDCON THE 
VOLTMETER TEST POINT
1.LEAD 510P -
BOARD 510P  -
SPEEDMETER  CHECK +5VDC...

F-42TROUBLESHOOTING & REPAIRF-42
NA-5
TEST DESCRIPTION
This test will help the technician to determine if the T1 and/or T2 tran\
sformers are functioning
properly.
MATERIALS NEEDED
115VAC power supply
Volt-Ohmmeter (Multimeter)
5/16 Nutdriver
Slot head screwdriver
T1  and T2 TRANSFORMER TEST
Service and repair should be performed only by Lincoln Electric factory trained per-
sonnel. Unauthorized repairs performed on this equipment could result in danger to
the technician or the machine operator and will...

F-43TROUBLESHOOTING & REPAIRF-43
PROCEDURE
1.  Remove all input power to the NA-5.
2.  Using 5/16 nutdriver open the con-trol box PC board access door.
3.  Locate the T1 and T2 transformers. See Figure F.2
4.  Locate and remove the two sets of primary leads (#531B and #532)
from the upper terminal strip TS2.
Label leads for reassembly.  See
wiring diagram and Figure F.2 5.  Using the 115VAC supply carefully
apply 115VAC to the T1 primary
leads #531B and #532.
6.  Check for approximately 10VAC at the...

F-44TROUBLESHOOTING & REPAIRF-44
7.  Check for approximately 22VAC atthe blue secondary leads.  The blue
secondary leads are connected to
the logic board.  See wiring diagram.
8.  Check for approximately 18VAC at the white to red leads.  The white
and red leads are connected to the
power board.  See wiring diagram.
9.  Check for approximately 36VAC at the red to red leads.  Both red leads
are also connected to the power
board.  See wiring diagram.
10.  If  all the secondary voltages are
correct the T1...

F-45TROUBLESHOOTING & REPAIRF-45
NA-5
TEST DESCRIPTION
This test will aid the technician in determining if the transformer on t\
he voltage board is func-
tioning properly.
MATERIALS NEEDED
5/16 Nutdriver
Phillips head screwdriver
115VAC power supply
Volt/Ohmmeter
VOLTAGE BOARD TRANSFORMER TEST
Service and repair should be performed only by Lincoln Electric factory trained per-
sonnel. Unauthorized repairs performed on this equipment could result in danger to
the technician or the machine operator and...

F-46TROUBLESHOOTING & REPAIRF-46
TEST PROCEDURE
1.  Remove all input power to the NA-5.
2.  Using the 5/16 nutdriver open thecontrol box PC board access door.
3.  Locate the voltage board.  See Figure F.3 4.  Remove the molex type plugs from
the voltage board.
5.  Using the phillips head screwdriver remove the voltage board from the
control box.
6.  Locate the transformer and test points on the voltage board.  See
Figure F.4
VOLTAGE BOARD TRANSFORMER TEST(Continued)
NA-5
FIGURE F.3  VOLTAGE BOARD...

F-47TROUBLESHOOTING & REPAIRF-47
7.  Using the 115VAC supply carefullyapply 115VAC to pins #8 and #9 in
the nine pin molex plug cavity on the
voltage board.  See Figure F.4
Make sure the board and leads are
insulated from each other and any
metal conductors.
8.  Using the voltmeter check for approximately 24VAC at the sec-
ondary test points.  See Figure F.4 
Note: The secondary voltage will vary
with the input primary voltage. The
insulating material will have to be
removed from the secondary test...