I 120v, Transformer, 120 vac to transformer – A.O. Smith 960 through 967 User Manual
Page 20
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BTH S E R V I C E H A N D B O O K
T R O U B L E S H O O T I N G
TRANSFORMER
STEP 2
120 VAC TO TRANSFORMER
I 120V
CO
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STEP 2: CHECK FOR 120 VAC TO TRANSFORMER FROM PIN 1 AND 2 ON CONTROL
BOARD CN4 TERMINAL.
Condition:
• Disconnect CN4 plug from control board.
• On/Off switch is on.
Check for 120 VAC between pin 1 and 2 at CN4 on the control board as illustrated above. Perform
this test with the CN4 plug disconnected and the On/Off switch turned on.
IF...
THEN
120 VAC is not present
check CN1 plug connection
replace control board if Step 1 has been performed and results were successful.
120 VAC is present
reconnect CN4 plug to control board, continue to Step 3.
A. O. Smith Water Products Co.
Ashland City, Tennessee © 2004
19
Technical Training Department
TC-044 Revision 6