Dacor EORS127 Service Manual page 12

Dacor Renaissance Wall Oven Service Guide
Symptoms
No elements cycling in
ALL modes (cont.)
Bake element only is not
cycling during preheat,
bake, conv bake, conv
roast, self clean, HOLD
Page 8
All the voltage test points will be at the relay board.
10) L1B - L2 = 240 VAC (Lower elements). Continued...
If continuity tests on previous page and above are good and voltage
check is good, run any mode on faulty cells and check the following...
11) K7 L2 IN1 – K7 L2 OUT1 = 0 VAC (upper/single DLB relay)
12) K4 L2 IN2 – K4 L2 OUT2 = 0 VAC (lower DLB relay)
If more than 100 VAC is present then the DLB relay it is not activating
due to faulty communication with the display board. Check the
following...
13) Make sure P3 connector and cable are properly connected. If in doubt
replace with new P3 cable.
14) See if the DLB relay is damaged. If so replace relay board.
15) If the above does not work, replace the display board as last resort.
16) Upon replacement of wires, connectors, relay board or display board,
rerun the above test to confirm problem is corrected.
1) Make sure that only the bake element is not cycling. If the other elements
are not cycling, see No elements cycling in ALL modes on previous
page.
2) Start with a cold oven and run BAKE, CONV BAKE, etc. on the faulty cell
and make sure that oven goes to preheat mode. If it does not go to
preheat, cool down the oven and rerun the mode until it is cold enough to
go into preheat. Once oven goes into preheat, test these point of the
faulty cell using voltmeter. The voltages should follow the preheat cycling
pattern:
3) Check upper or single bake, K7 L2 OUT1 – BAKE 1 (P19) (Check upper
BAKE ON and OFF time)
4) Check lower bake, K4 L2 OUT2 – BAKE 2 (P24) (Check lower BAKE ON
and OFF time).
5) If the oven is in preheat and there is no activity and no cycling indicated
by voltmeter, then the bake relay is damaged and relay board needs to
be replaced. Upon replacement do the same test again.
6) If there is activity indicated by voltmeter, then turn OFF the power and
check the bake element resistance on the following terminals:
7) Check upper or single bake element, K7 L2 OUT1 - BAKE 1 (P19) =
approximately 20 ohms.
8) Check lower bake element, K4 L2 OUT2 - BAKE 2 (P24) =
approximately 20 ohms.
9) If resistance is high, then check for continuity of the bake element wires
on the faulty cell:
10) Check upper or single bake wire, BAKE 1(P19) to Upper Bake Element
terminal.
11) Check lower bake wire, BAKE 2(P24) to lower bake element terminal.
12) Check upper or single bake wire, K7 L2 OUT1 to the other upper bake
element terminal.
13) Check lower bake wire, K4 L2 OUT2 to the other lower bake element
terminal.
14) If continuity is good for all wires, check to make sure the bake element
connector is connected to the bake element terminal. If connection good,
disconnect bake connections and directly measure the bake element
resistance and if it not near 20 ohms, replace bake element. Continued...