Instruction manual, SPT and MPT 31x series transponders

SPT and MPT 31x series
Note
The socked head screws are manufactured of SMO steel, and
must only be replaced by screws of the same material.
How to replace a transponder circuit board
Refer to How to open a transponder on page 71.
Refer to How to assemble a transponder on page 78.
Rx board, Tx board and Microcontroller
board
To replace one of these circuit boards, follow the procedure
below:
1 Short-circuit the capacitor in the electronics chassis, to
discharge the transmitter capacitors (use a 10 to 20 Ω
resistance). The location of the capacitor may vary,
depending on model.
CAP
(Cd6542)
Figure 27 Part of a transponder, indicating location of the
electronics chassis capacitor
2 Unscrew the plastic locking devices. The appropriate
board can now be removed from the chassis.
76 160820/O