KX-TDA0194XJ, KX-TDA0194X - Panasonic PBX Service Manual (repair manual). Page 10

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To protect the back board from static electricity,do not touch parts on the back board in the main unit and on the optional service
cards.To discharge static,touch ground or wear an earthing strap.
The following software version corresponds to ESVM4.

TDA100/200/600 : MPR V5.xx
TDE100/200        : MPR V2.xx
TDA0190             : LPR V4.xx

Function
4-channel simplified voice message card for Built-in Simplified Voice Message feature.
Also supports MSG card features. To be mounted on the OPB3 card.

Accessory and User-supplied Items
Accessory (included):screws X 3
User-supplied (not included): none

CAUTION
When installing/uninstalling an ESVM card, be careful not to damage the chips around the connection parts.
Doing so may cause severe damage to the ESVM card.

Note
When using an ESVM card for the SVM feature, it must be mounted on sub-slot 3 (highest slot) of the OPB3 card.