3-25. DRYER UVSCANNERAND FLAME SAFEGUARD ASSEMBLY(CONT)
10. Push dryer start switch and check
for 120 V ac on terminal (22) and (23)
of base terminal board (24). If voltage
is not normal, check incoming power
source (appendix E, figure 4). If voltage
at terminals 2 and 7 is normal, install
flame safeguard control circuit card (13)
and two screws (10).
N O T E
If buzzer sounds, an ignition failure is indicated.
Unit maintenance has determined that ignition
takes place momentarily but system shuts down
immediately after ignition.
11. With multimeter set for dc operation,
press dryer start switch, press reset push-
button (14), and check voltage at test points
(16) and (17). If voltage is not 5 to 6 Vdc,
replace UV scanner.
Unit maintenance has determined that
ignition does not occur after pressing reset
pushbutton but buzzer sounds.
12. With multimeter set for ac operation,
press dryer start switch and check for
120 V ac at test points (19) and (18)
after pressing reset pushbutton (15).
If voltage is zero, replace flame safe-
guard control circuit card (13).
Callouts (22) and (23) are
actually terminals 2 and 7