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Nem Call Initiation From Na Sub When An Na-t/a Is Also... 4 - Moderate/hard - Internal Connection Or Component Addition.

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SYSTEM/MODEL: MODIFICATION: DIFFICULTY LEVEL: COMPONENTS REQUIRED: INSTR/OPERATIONS: NEM Call initiation from NA sub when an NA-T/A is also used 4 - Moderate/hard - Internal connection or component addition. 1.Capacitors: Three Aiphone model NP-25V (33 µfd, 25V, Non-polarized) 1. Install capacitors as shown on following schematic. 2. Remove capacitor shown and replace with jumper. REFERENCE DRAWING #: 0998-624 Aiphone’s product warranty applies to products properly modified using these instructions. However, if a unit is damaged as a result of improper modification, the warranty does not apply. MODIFICATION DIAGRAM NA-T/A USED IN CONJUNCTION WITH A STANDARD SUB STATION Remove capacitor and replace with a jumper PC-253C 68Ω, 1/2W RED Add capacitor here 2.2KΩ, 1/4W WHITE 100Ω, 1/4W B.P. 33µfd 25V 22Ω, 1/4W YELLOW 1 ORANGE 2 50F1 24Ω, 1W BLUE 50F1 62Ω, 2W BLACK Add capacitor here BROWN RED 3 4 All Diodes are 1N-4007 NOTES: 1. This modification will allow the call button on an NEM series sub station to place a call to the master. 2. Picking up the NA-T/A handset will also activate the call-in from the sub location. 3. Capacitors being added are the NP-25V (33 µfd, 25V, non-polarized) Drawing Name: 624-NEM-NAT SUB Drawing # 0998-624