Pub. 42004-120C
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
Model 478-002
Centra-Page Desktop Subs et
Confidentiality Notice
This manual is pr ovided s olely as a n op erat ional, installation, and maintenance guide and contains sens itive
bus ines s and t echnic al infor ma tion tha t is confident i al and p roprietary to G AI-Tronics. GAI-Tronics
retains a ll intellectual pr operty and other rights in or to t he inf ormation c ontained herein, and s uch
informa tion may only be used in connection wit h the operation of you r GAI- Tronic s pr oduct or system.
This ma nual may not be disclosed in any form, in whole or in p art, dir ec tly or indirectly, to any t hird pa rty.
General Information
The GAI- Tr onic s Centra-Page s ystem provides dependable p aging and party-line communications f or
rugged and hazardou s industrial fac ilities. Centr a-Page systems feat ure centrally- loc ated electronics that
provide envir onmental pr otection and unitized amplifica tion for easy maint enance. S tandard C ent ra- Page
cabinets can support up to 30 handset stations, and in most cases, up to 60 speakers. Alarms and telephone
interf acing can als o be added to Centra-P age systems.
The Model 478-002 Desktop Station is used for paging and party-line communications. Equipped with a
pus h- to-page handset and pa rty- line s elect or, the station is easy to u se.
To generate a page, the station user lift s the handset, c hecks for an availab le p arty line, presses the handset
pres sba r while announcing their page making s ure to indic ate which p arty line they are using, and relea ses
the pr es sba r. The paged individu al then goes t o a st ation, tur ns the part y- line s elect or swit c h to the
approp riate party line, lifts the handset , and answer s the page. T wo- way communica tion can then ta ke
place on the p ar ty li ne.
Although t here is no absolute limit on the number of stations in use on a given int ercom path (part y line 1
or 2) , for a “conference” ca ll, the effectiveness of t he si det one rejection circuit diminishes , and overall
perf ormance begins to diminish when four or more sta tions a re connected t oget her. It is therefore
recommended that “conference” c all pa rty line conver sat ions be limited to fou r simult aneous u sers.
GAI-Tronics Corporation P.O. Box 1060, Reading, PA 19607-1060 USA
610-777-1374 800-492-1212 Fax : 610-796-5954
ISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
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Model 478-002, like the other Centra-Page station models, corresponds to a plug-in PCBA located in the
central card rack assembly. The Model 69037-101 Line Cards are sold and shipped separately from this
station. The card contains the handset dc power sou rce, dual s witching relays, and a 1 6-watt s peaker
amplifier with 8-ohm and 70-volt line ou tput s.
This publication provides instructions on installation and operation of the Model 478-002 Desktop Station.
A list of replacement part s is included for repairs.
CAUTION
Do not install this desktop subset in any hazardous areas. This desktop subset is for “safe area”
operation only. Such installation may cause a safety hazard and consequent injury or property
damage.
Figure 1. Model 478-002 Centra-Page Desktop Subset Outline Details
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Installation in Centra-Page Systems
1. Remove the two s c rews on t he back and the t wo screws on the bottom of the s ubset .
2. Hinge the hous ing f orward, b eing careful of the ha rness still interconnected. This p rovides a c c es s to
the ter mination bloc ks on the PCBA (mounted on the subset base assembly a s shown in Fi gure 2) .
3. Field wiri ng c able is u ser-s upplied. W iring shou ld c onsist of three twis ted and individually shielded
pairs of No. 18 AWG (white and black, brown and yellow, a nd red and b lue when using GAI - Tr onic s
Model 60051-001 wire).
4. Spade lug the wires, and connect them to the 6-p oint ter mina l block.
5. Included in a n envelope is a st rain-relief bushing. Us ing a pa ir of pliers, fit the b u shing around the
cab le and into the cable entrance on t he s ubset. The b ushing will protect the cab le entranc e.
6. Feed the ca ble into the condu it tha t ru ns to the cent ral c abinet.
7. The terminal bloc ks for each st ation (one sta tion per terminal block) a re on the cha ssis that is mounted
on the ba c k of the card rack. These blocks are labeled like the bloc ks in the desktop station. Make
sure that the wire colors for each lug match the one in the station.
8. Spade lug the wires, and secure them at the central ca binet. Close the centra l c abinet door.
Figure 2. Subset Wiring for Centra-Page
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Maintenance
The following table lists some of the most common difficulties encountered in Model 478-002 Desktop
Stations . Inclu ded are some troubles hooting hints to aid in remedying these prob lems.
Troubleshooting
Problem Solution
Integral sp eaker level requires
adjustment.
Station shows a lways on
hook.
Incoming convers ation level
requires adju stment.
Miscellaneous
1. Adjust the volume contr ol on the subset.
2. Adjust the volume contr ol at t he cent ral c abinet ( Centra-P age
systems only).
3. Rep lac e the integral speaker.
4. Replace the 70.7 V line matching transformer.
The reed switch may be defec tive. Si mula te r eed switch operati o n by
disconnect ing the reed switc h at t he t erminal board, and s horting
(connect) pins 1 and 2 or J3 and J4. This should c ause the station to
go off hook. If it does, the defective reed is pr obab ly defective and
requires rep lacement. (The reed swit c h is located under t he handset
cradle. Contact a GAI-Tronics S ervice Center for f u rther
information).
Rep lac e the receiver element located i n the hands et.
1. Keep all mechanical parts well lub ricated. This will help avoid
gumming and jamming due t o wast e b uildup.
2. A defective stat ion c ard in the central ca binet can cau se numerous
problems. If a station is non-functional, try switching 69037 cards
with a known good sta tion.
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Specifications
Electrical
Handset:
Microphone.....................................................10 ohms; pressure differential, noise-canceling dynamic
Receiver.................................................... 150 ohms; high-efficiency dynamic, hearing-aid c ompatib le
Cable.................................................................................. Retractile, 6-foot (1.82 m) extended, PVC
Material ......................................................................................................................Light gray AB S
Control.................................................................................................Pressbar (push-to-page) switch
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Frequency response....................................................................................................200–2000 Hz, +
3 dB
Distortion........................................ Microphone input to r eceiver outp ut 2 % ( nomina l line level @ 1 kH z )
Sidetone rejection.................................................................................14 dB (nominal line level @ 1 kHz)
DC line current........................................................................................................Handset: 8 mA typical
Mechanical
Construction/finish:
Housing.......................................................................................................................Light gray ABS
Front panel and base............................................16 gauge CRS with black polyurethane enamel finish
External controls................................................Rotary party line selector, integral speaker volume control
Connections ...............................................................................Internal, screw-type barrier terminal block
Integral speaker.............................. 3 sq. in., 45-ohm, 4-watt, moisture-proof, shielded magnetic pole piece
Temperature range, operating............................................................-22° F to +140° F (-30° C to +60° C)
Dimensions...............................................9.35 L × 10.46 W × 4.81 H inches (237.5 × 265.7 × 122.2 mm)
Shipping weight................................................................................................................................. 5 lbs.
Approvals..........................................................................................................................................None
Replacement Parts
Part Number Description
10450-004 Pressbar Handset Assembly
12511-001 Dynamic Noise-canceling Transmitter with Cap
12514-007 6-foot PVC Coil Cord
12550-002 Receiver Replacement Kit
25728-003 Housing/Hookswitch Assembly
61504-025 Speaker/Volume Control Harness Assembly
61504-049 Rotary Switch Harness Assembly
61504-029 Transformer Harness Assembly
69142-001 Termination PCBA
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Warranty
Equipment. GAI-Tronics warrants for a period of one (1) year from the date of shipment, that any
GAI-Tronics equipment supplied hereunder shall be free of defects in material and workmanship, shall
comply with the then-current product specifications and product literature, and if applicable, shall be fit
for the purpose specified in the agreed-upon quotation or proposal document. If (a) Seller’s goods prove
to be defective in workmanship and/or material under normal and proper usage, or unfit for the purpose
specified and agreed upon, and (b) Buyer’s claim is made within the warranty period set forth above,
Buyer may return such goods to GAI-Tronics’ nearest depot repair facility, freight prepaid, at which time
they will be repaired or replaced, at Seller’s option, without charge to Buyer. Repair or replacement shall
be Buyer’s sole and exclusive remedy. The warranty period on any repaired or replacement equipment
shall be the greater of the ninety (90) day repair warranty or one (1) year from the date the original
equipment was shipped. In no event shall GAI-Tronics warranty obligations with respect to equipment
exceed 100% of the total cost of the equipment supplied hereunder. Buyer may also be entitled to the
manufacturer’s warranty on any third-party goods supplied by GAI-Tronics hereunder. The applicability
of any such third-party warranty will be determined by GAI-Tronics.
Services. Any services GAI-Tronics provides hereunder, whether directly or through subcontractors,
shall be performed in accordance with the standard of care with which such services are normally
provided in the industry. If the services fail to meet the applicable industry standard, GAI-Tronics will
re-perform such services at no cost to buyer to correct said deficiency to Company's satisfaction provided
any and all issues are identified prior to the demobilization of the Contractor’s personnel from the work
site. Re-performance of services shall be Buyer’s sole and exclusive remedy, and in no event shall GAITronics warranty obligations with respect to services exceed 100% of the total cost of the services
provided hereunder.
Warranty Periods. Every claim by Buyer alleging a defect in the goods and/or services provided
hereunder shall be deemed waived unless such claim is made in writing within the applicable warranty
periods as set forth above. Provided, however, that if the defect complained of is latent and not
discoverable within the above warranty periods, every claim arising on account of such latent defect shall
be deemed waived unless it is made in writing within a reasonable time after such latent defect is or
should have been discovered by Buyer.
Limitations / Exclusions. The warranties herein shall not apply to, and GAI-Tronics shall not be
responsible for, any damage to the goods or failure of the services supplied hereunder, to the extent
caused by Buyer’s neglect, failure to follow operational and maintenance procedures provided with the
equipment, or the use of technicians not specifically authorized by GAI-Tronics to maintain or service the
equipment. THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE IN LIEU OF AND
EXCLUDE ALL OTHER WARRANTIES AND REMEDIES, WHETHER EXPRESS OR IMPLIED BY
OPERATION OF LAW OR OTHERWISE, INCLUDING ANY WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Return Policy
If the equipment requires service, contact your Regional Service Center for a return authorization number
(RA#). Equipment should be shipped prepaid to GAI-Tronics with a return authorization number and a
purchase order number. If the equipment is under warranty, repairs or a replacement will be made in
accordance with the warranty policy set forth above. Please include a written explanation of all defects to
assist our technicians in their troubleshooting efforts.
Call 800-492-1212 (inside the USA) or 610-777-1374 (outside the USA) for help identifying the
Regional Service Center closest to you.
(Rev. 10/06)
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