3-26. DRYER UV SCANNER AND FLAME SAFEGUARD ASSEMBLY (CONT)
Push dryer start switch and check for 120 V ac
on terminals (24) and (25) of base terminal
board (12). If voltage is not normal, check
incoming power source (FIG. 2-4). If voltage at
terminals 2 and 7 is normal, install flame
safeguard control circuit card (11) and two
If the buzzer sounds, an ignition
failure is indicated.
Unit maintenance has determined
that ignition takes place momentarily
but system shuts down immediately
With multimeter set for dc operation, press dryer
start switch, press reset pushbutton (13), and
check voltage at test points (14) and (15). If
voltage is not 5 to 6 V dc, replace UV scanner.
ignition does not occur after pressing reset
pushbutton but buzzer sounds.
With multimeter set for ac operation, press dryer
start switch and check for 120 V ac at test points
(16) and (17) after pressing reset pushbutton
(13). If voltage is zero, replace flame safeguard
control circuit card (11).
Callouts (24) and (25) are actually
terminals 2 and 7 respectively.