Tektronix DM505 Instruction Manual page 72

POWER SUPPLIES
FOR ANY MALFUNCTION
WHEH THE CAUSE IS NOT
READILY APPARENT, FIRST
SUPPLIES.
f
12 V
SUPPLY
NO
ALSO CHECK FOR EXCESSIVE
+5 Y
SUPPLY
LOAD ON f 5 V SUPPLY.
13A AND 138
CHECK FOR MALFUNCTION
IN
-12
Y
SUPPLY WHICH MAY
1
L O A D D O W N T H E
/
TRANSFORMER.
I
ALL SgEPLIES
I