Tektronix 551 Dual Beam Instruction Manual page 100

Fig. 2. Shows fan connection for
234V operation.
To convert the Type 551 indication and power supply units for operation an
234 V nominal line voltage:
1. Remove the straps between terminals 1 and 2, 3 and 4 on all three of the
transform ers (2 in Power Supply and 1 in Indicator).
2. Remove the strap between terminals 13 and 14 of the inter-connecting plug
on the Power Supply.
3. Looking at the bottom of the Power Supply unit from the rear. Move the
right-hand fan lead from the third slot to the second slot in the ceramic
strip. This movement in the Power Supply unit will convert the fan motors
of both units for operation on 234 volts.
4. Place straps between terminals 2 and 3 on the transform ers. Remember to do
all three of the transform ers.
5. Put in the correct value fuses as called out in the parts list of the manual.
TYPK 551
Fig. I. Transform er
connections.