TROUBLE SHOOTING PROCEDURE
lf entire unit is not working, proceed as follows:
1.
Check circuit breaker box to insure that breaker for hood is not tripped.
2.
Remove printed circuit board enclosure cover by removing two screws securing the cover.
(See Figure I .)
CAUTION: SHOCK HAZARD
SOME CIRCUIT BOARD COMPONENTS (INCLUDING HEAT SINKS) ARE NOT ISOLATED FROM
THE AC POWER LINE.
3.
Disengage five pin connector from P. C. board and check for 115VAC (nominal) AC line voltage
between the black wire socket (end socket) and white wire socket (center socket) by inserting
VOM probes into sockets.
4.
If voltage is not present, proceed as follows:
a. Turn off power at breaker box.
b. Check connections in rear power entry box. (See Fig. 1.)
(1) Push in filter retainmg tabs and remove filter from wiring compartment.
(2) Remove cover retaining screws and cover.
(3) Remove wiring box covers (2).
C.
Check continuity of wires from wire nut connections to P. C. board sockets by inserting one
meter probe in wire nut connection and the other probe in respective socket connector.
d. Repair or replace as required, restore power to unit and again check for voltage at P. C. board
connector.
5.
If the fan or light still does not operate, proceed as follows:
a. With five pin connector plugged into board and light and/or fan turned on, check output of the
red (light) and blue (fan) wires in the five pin connector by inserting one probe of the meter in
the backof thesocket at therespectivewireconnection (redor blue) andtheotherprobein the
back of the socket at the black wire connection.
(1) Reading for red wire output should be 50-65 VAC if the light is on “Lo” or loo-125 VAC if
the light is on “Hi”.
(2) Reading for blue wire output should be between 72 VAC and the line voltage reading,
depending upon fan speed setting.
b. If output readings are correct, problem is in the wiring from plug to devices (fan and light) or in
the devices themselves. (Bad socket or bulb and/or defective fan motor.)
C.
If outputs are not correct, problem is in the circuit board or membrane switch. (See Page 2.)
CIRCUIT BOARD ENCLOSURE -,
COVER
MTG SCREWS (2),
\
FIVE PIN CONNECTOR
.y TRIM RETAINING SCREWS (41,
FILTER RETAINING TABS (4)
-J
COVER RETAINING
SCREWS (2)
A626-476
FIG. 1
INSIDE OF HOOD
(1)
1-11-64
