Casio PRT-40C Repair Manual page 17

1) Materials Used
a) One module equipped with an EL (transformer
up-conversion type)
QW-1199/1219/1298/1188/1289/1431/1433/
1299/1441/1557 or equivalent modules
b) Two alligator clips (with lead wires)
2) Disassemble the module and remove the PCB
ass'y.
3) Solder one of the lead wires of the alligator clips
to the SE terminals of the four terminals to which
the transformer is soldered on the PCB ass'y. (Fig.
6-1/Fig. 6-2)
4) Reassemble the module with the lead wires still
soldered to the PCB ass'y. The lead wires should
extend outside the module from the side of hous-
ing-2. (When it is difficult to pull the lead wire
through the gap in housing-2, either grind hous-
ing-2 slightly or melt it with a soldering iron to
create a larger gap.)
5) Twist the other lead wire around one of the four screws on the main plate and fasten it to the plate/
main. (This completes the EL checker.)
6) When checking the EL, connect alligator clips to the two terminals of the EL being checked and try
illuminating the EL by pressing the light button of the checker (module) to make the circuit. (Fig. 6-
3) At this time, the EL connected with the alligator clips is not defective if it lights simultaneous to
pressing of the light button on the EL checker.
Alligator clip
Fig. 6-2
Lead wire
P.C.B. Ass'y
Alligator clip
— 13 —
Fig. 6-1
SE Terminal
Fig. 6-3
EL
EL Checker