TM11-6125-256-34
four screws, flat washers, and lock washers onto four
threaded spacers
Regulator Assembly, Type 4B93-1-A.
(4) Attach variable resistor R23 to control box
(fig 3-6)
assembly with the internal tooth lock washer and hex
a Removal
nut Loosely install jam nut Attach wires between van-
(1) Remove the control box cover
able resistor R23 at terminals 8, 9, and 11 (fig 3-6)
(2) Remove jam nut, hex nut, and internal tooth
Do not tighten jam nut until voltage adjustment has
lock washer and remove variable resistor R23 from
been performed (para 3-5) Tie lead wires from van-
control box assembly front panel Cut ties from harness
able resistor R23 to wiring harness
to free leads
(5) Install the control box cover
(3) Remove the regulator board leads from ter-
minals 1 through 6 and 10, by removing seven screws
and lock washers
(4B93-1-A)
(4) Remove four screws, flat washers, and lock
Use the operational test procedure given in paragraph
washers and remove the voltage and frequency regu-
3-5 to test the output frequency
lator assembly from the threaded spacers in the control
box assembly
Equipment which meets the performance standards in
b Installation
tables 3-3 and 3-4 may be considered acceptable for
(1) Install the regulator board leads to terminals
service Perform each step of the tables in sequence
1 through 6 and 10, by fastening them with seven
For each step, perform all the actions in the control
screws and washers
setting columns and then perform the specific pro-
(2) Check that frequency adjustment has been
cedure and verify it against its performance standard
performed (para 3-5)
If any abnormal actions or readings occur, refer to the
(3) Position the voltage and frequency regulator
troubleshooting procedures listed in table 3-2
assembly in the control box assembly and secure with
