Troubleshooting Guide

VT-751D and VT-752D
Master Appliance Corp.
2420 18
th
St.
Racine, WI 53403-2381 USA
Tel: [phone]
Email: [e-mail]
www.masterappliance.com
58279E REV A
pg. 3 of 7
DISASSEMBLY INSTRUCTIONS
UNPLUG HEAT GUN. TAKE NOTE OF WIRING LAYOUT.
To remove dial, gear and support (Figure 2)
NOTE: Dial, Gear, and Support must be removed to remove the
circuit board and motor.
1. Cut small incision thru center of label on dial to expose the #6-32
nut Ⓐ. and washer.
2. Loosen the #6-32 nut, Ⓐ and remove the dial Ⓑ, spring and
the gear Ⓒ. The nut and washer Ⓐ can remain assembled
between the label and the dial.
3. Remove the two (2) round head screws Ⓓ, then remove the
support Ⓔ and the hex bolt Ⓕ.
To remove cover and handle halves (Figure 1)
1. Remove two (2) nozzle mounting screws Ⓦ at the rear of the
shield. If nozzle mounting screws are lost or damaged, replace
only with #6-32 steel machine screws, 3/16-inch minimum length
to 1/2- inch maximum length.
2. Gently pull shield from gun housing. Shield, nozzle and mica
insulator may come apart as one unit. Pull element out of
housing.
3. Remove (2) housing screws (#6-32 x .50) Ⓗ and remove cover.
4. Remove (4) handle screws (#6-19 x .63 long) Ⓙ and remove
handles from housing.
To remove the motor (Figure 1)
1. Loosen the set screw in the blower wheel with a 1/8 hex key
wrench, then remove the blower wheel from the motor. Remove
screw Ⓚ from the bottom of the housing. (Figure 2).
2. Place the heat gun on a flat surface with the motor facing
upward. Remove (2) outer screws Ⓛ on the top flange of the
motor. Gently pull the motor straight up and out of the housing,
taking care not to disconnect the white or black wire terminals.
Set the motor on the outside of the housing. If wires become
disconnected, see motor assembly instructions for proper wiring
locations.
To disconnect electrical terminals for the motor kit, the element
connector kit, and the cordset kit (not required for switch/bezel kit
or circuit board kit):
1. Cut and remove the existing cable ties and shrink tube to expose
the quick-connect terminals (Figure 3).
2. Disconnect the black lead wire of the motor from the switch.
Disconnect the white lead wire of the motor from the piggyback
terminal on the white wire from the element connector.
To remove the switch/bezel assembly:
1. Lift the switch/bezel assembly away from the handle, being
careful not to break the tabs of the handle (Figure 4) .
Disconnect all wires from the switch.
To remove the circuit board:
1. Remove the #6-32 pan head screws (2 screws) Ⓜ from the top
of the circuit board. (Figure 1). Remove the shrink tube over the
terminals of the black wires between the circuit board and the
element connector Ⓣ (Figure 5).
2. Disconnect the terminals Ⓟ. (Figure 5).
3. Disconnect the circuit board from the switch Ⓝ (Figure 5).
4. Remove the circuit board.
SWITCH / BEZEL
Figure 4
TABS IN
HANDLE
Ⓟ
WIRE FROM CIRCUIT BOARD
CONNECTS TO BLACK WIRE OF
ELEMENT CONNECTOR. COVER
CONNECTION WITH SHRINK TUBE
BLACK WIRE FROM CIRCUIT BOARD
CONNECTS TO SWITCH
Ⓝ
CIRCUIT BOARD
ELEMENT
CONNECTOR
Figure 5
Ⓣ
SHRINK TUBE
Figure 3
CABLE TIES
TERMINALS
SHRINK TUBE