GAI-Tronics 352-001 UL Class I Division 1 Telephones - Manual (Page 8)

Pub. 42004-454A
Model 352-001, 352-002, 352-003, and 352-004 Division 1 Telephones Page: 8 of 13
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3. When a Ring Relay PCBA is present, connect the incoming subscriber line to the TB1 terminal block.
See Figure 8 and Figure 9.
Figure 8.
Figure 9.
4. Connect the external sounder or beacon to TB2, for activation with an incoming telephone call.
5. Reconnect the USOC RJ11C modular connector cord to the Ring Relay PCBA, from the main PCBA
on the front panel, before reattaching the front cover.
WARNING Any external equipment connected to the Ring Relay PCBA must be rated for the
hazardous area where it will be located. Improper installation or equipment may cause a safety hazard
and consequent injury or property damage.
Volume Control Jumper Setting
The handset receiver volume control is factory set to default to its original setting (0 dB) when the
telephone is hung up. To save the volume control setting, jumper J4, which is factory set at positions 2
and 3, must be moved to positions 1 and 2. Refer to Figure 7 for the location of J4.