P83676 A
Sheet 4 of 5
OPERATING INSTRUCTIONS:
- Pick up telephone hand set and press the CO line button, or dial the number assigned to paging. When used with Wheelock Zone
Control, next touch/dial single digit number assigned to zone in which TBH-104-LH has been connected, and listen for page alert
tone.
- Paging and talkback is now possible. The calling party has control of the conversation (direction of speech).
- Talkback is possible only while LED is illuminated and calling party is silent.
- Talkback (respond hands free) at a voice level normally used (in that location) to respond to another person at the same distance.
- Adjust the "HORN VOL" (PAGE) control and "MIC VOL" (TALKBACK) control located on the printed circuit board to desired
levels See
Figure
5.
- Replace cover on control unit and tighten sufficiently to ensure a watertight seal with the gasket.
Figure 5: Simplified Schematic & Wiring Diagram
NOTE:
If Zone Control is not used, then install jumper between adjacent terminals "INH" and "GND".
TROUBLING SHOOTING:
CONDITION
CHECK
1. No sound in page mode.
1) Check that horn volume control is turned up (clockwise).
2) Check presence and polarity of -24VDC and GND.
3) Check audio presence and level on TIP and RING at TBH-104-LH
Control Unit , and if necessary also at the audio source. (-15dBM is
minimum audio level required)
2. Low volume in page mode.
1) Check that "HORN VOL" (PAGE) control in Control Unit is turned up
(clockwise).
2) Check audio presence and level on TIP and RING at Control Unit, and if
necessary also at the audio source. (-15dBM is minimum audio level
required).
3. Listening volume at phone is too high
or too low in talkback mode.
1) Set the "MIC VOL" (TALKBACK) control to the suitable listening level.
NOTE:
Some telephone systems require that CO trunk port (loop start) or CO line port be equipped with a trunk card, page card or
other equipment. Consult the telephone manufactures system manual for equipment or programming required.
ANY MATERIAL EXTRAPOLATED FROM THIS DOCUMENT OR FROM WHEELOCK MANUALS OR OTHER
DOCUMENTS DESCRIBING THE PRODUCT FOR USE IN PROMOTIONAL OR ADVERTISING CLAIMS, OR FOR
ANY OTHER USE, INCLUDING DESCRIPTION OF THE PRODUCT'S APPLICATION, OPERATION, INSTALLATION
AND TESTING IS USED AT THE SOLE RISK OF THE USER AND WHEELOCK WILL NOT HAVE ANY LIABILITY
FOR SUCH USE.
CAUTION:
These devices are not intended for use in hazardous locations as defined by the National Electrical Code (NEC) and
by the National Fire Protection Association (NFPA).
Limited Warranty
