VSP-V-2925A
Issue 3
TALKBACK INTERCOM SYSTEM
V-2925A - ADD ON EXPANSION UNIT
FOR THE V-2924A
The basic V-2924A Talkback Intercom System provides 24 stations with one-way, two-way, group call and all call
pages. The V-2925A Expansion Unit is an add on unit for the V-2924A. Each V-2925A Expansion Unit will
expand the V-2924A by twenty-four (24) additional stations. Up to three (3) Expansion Units can be added to a
system for a total of 48, 72, or 96 zones of paging.
The V-2925A can ONLY be used with the V-2924A. If you have the V-2924 model, please contact Technical
Support for assistance.
WARNING: Disconnect main power before servicing.
Mounting
• Plug the Expansion Unit into the Control Unit. For the first Expansion Unit, insert the P1 connector from the
Expansion Unit into the P8 connector on the Control Unit (Refer to Figure 1 for location of connectors). (For
each additional Expansion Unit, insert P2 into P1 – Refer to Figure 1 of the Control Unit document).
• Close latches attached to the top and bottom of the Expansion Unit over the keepers on the top and b ottom of
the Control Unit.
• Drill holes into backboard through mounting flanges on the Expansion Unit.
• Insert screws into ho les and tighten screws firmly.
Connections
Each Expansion Unit requires (2) 66B type punchdown blocks. Mount these on the backboard near the associated
Expansion Unit. Make connections to the punchdown blocks as specified in Figure 2 – Punchdown Block
Connections.
Setting Option Switches
All options programmed for the Control Unit are available on the additional stations provided by the Expansion
Units. The only switches on the Expansion Unit requiring attention are those for Background Music. Refer to
Figure 1 for location and Table 1 for the default values of these switches. Make changes as desired for the various
zones.
Dimensions/Weight
• 17.5”H x 8.37”W x 3.06”D
(44.45cm H x 21.26cm W x 7.77cm D)
• 11 lbs. (5.0 kg)
Operation
Same as Control Unit.
V-2924A with V-2925A Expansion Unit.
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FIGURE 1 - V-2925A CONTROL AND CONNECTOR LOCATIONS
Side View Top View
P1
P1
P4
P2
SW1
P3
Power
LED
Connectors:
P1
- Connects to the V-2924A Contro l Unit
P2
- Connects to an additional V-2925A Expansion Unit
P3
- Switch Inputs
P4
- Speaker Outputs
AC
Power
115/230
Switch
Fuse
Battery Backup
Connector
Switches:
SW1 - BGM Group Select Dip Switch (See Table)
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26
27
28
29
30
31
32
33
34
35
10
36
11
37
12
38
13
39
14
40
15
41
16
42
17
43
18
44
19
45
20
46
21
47
22
48
23
49
24
50
25
1
2
3
4
5
6
7
8
9
FIGURE 2 - PUNCHDOWN BLOCK CONNECTIONS
Block P3 - Switch Inputs Block P4 – Speaker Outputs
W/BL
BL/W
W/O
O/W
W/GR
GR/W
W/BR
BR/W
W/S
S/W
R/BL
BL/R
R/O
O/R
R/G
G/R
R/BR
BR/R
R/S
S/R
BK/BL
BL/BK
BK/O
O/BK
BK/G
G/BK
BK/BR
BR/BK
BK/S
S/BK
Y/BL
BL/Y
Y/O
O/Y
Y/G
G/Y
Y/BR
BR/Y
Y/S
S/Y
V/BL
BL/V
V/O
O/V
V/G
G/V
V/BR
BR/V
V/S
S/V
Expansion
Unit #1
INA25
INB25
INA26
INB26
INA27
INB27
INA28
INB28
INA29
INB29
INA30
INB30
INA31
INB31
INA32
INB32
INA33
INB33
INA34
INB34
INA35
INB35
INA36
INB36
INA37
INB37
INA38
INB38
INA39
INB39
INA40
INB40
INA41
INB41
INA42
INB42
INA43
INB43
INA44
INB44
INA45
INB45
INA46
INB46
INA47
INB47
INA48
INB48
N.C.
N.C.
*Expansion
Unit #2
INA49
INB49
INA50
INB50
INA51
INB51
INA52
INB52
INA53
INB53
INA54
INB54
INA55
INB55
INA56
INB56
INA57
INB57
INA58
INB58
INA59
INB59
INA60
INB60
INA61
INB61
INA62
INB62
INA63
INB63
INA64
INB64
INA65
INB65
INA66
INB66
INA67
INB67
INA68
INB68
INA69
INB69
INA70
INB70
INA71
INB71
INA72
INB72
N.C.
N.C.
*Expansion
Unit #3
INA73
INB73
INA74
INB74
INA75
INB75
INA76
INB76
INA77
INB77
INA78
INB78
INA79
INB79
INA80
INB80
INA81
INB81
INA82
INB82
INA83
INB83
INA84
INB84
INA85
INB85
INA86
INB86
INA87
INB87
INA88
INB88
INA89
INB89
INA90
INB90
INA91
INB91
INA92
INB92
INA93
INB93
INA94
INB94
INA95
INB95
INA96
INB96
N.C.
N.C.
26
27
28
29
30
31
32
33
34
35
10
36
11
37
12
38
13
39
14
40
15
41
16
42
17
43
18
44
19
45
20
46
21
47
22
48
23
49
24
50
25
1
2
3
4
5
6
7
8
9
W/BL
BL/W
W/O
O/W
W/GR
GR/W
W/BR
BR/W
W/S
S/W
R/BL
BL/R
R/O
O/R
R/G
G/R
R/BR
BR/R
R/S
S/R
BK/BL
BL/BK
BK/O
O/BK
BK/G
G/BK
BK/BR
BR/BK
BK/S
S/BK
Y/BL
BL/Y
Y/O
O/Y
Y/G
G/Y
Y/BR
BR/Y
Y/S
S/Y
V/BL
BL/V
V/O
O/V
V/G
G/V
V/BR
BR/V
V/S
S/V
Expansion
Unit #1
T STA25
R STA25
T STA26
R STA26
T STA27
R STA27
T STA28
R STA28
T STA29
R STA29
T STA30
R STA30
T STA31
R STA31
T STA32
R STA32
T STA33
R STA33
T STA34
R STA34
T STA35
R STA35
T STA36
R STA36
T STA37
R STA37
T STA38
R STA38
T STA39
R STA39
T STA40
R STA40
T STA41
R STA41
T STA42
R STA42
T STA43
R STA43
T STA44
R STA44
T STA45
R STA45
T STA46
R STA46
T STA47
R STA47
T STA48
R STA48
N.C.
N.C.
*Expansion
Unit #2
T STA49
R STA49
T STA50
R STA50
T STA51
R STA51
T STA52
R STA52
T STA53
R STA53
T STA54
R STA54
T STA55
R STA55
T STA56
R STA56
T STA57
R STA57
T STA58
R STA58
T STA59
R STA59
T STA60
R STA60
T STA61
R STA61
T STA62
R STA62
T STA63
R STA63
T STA64
R STA64
T STA65
R STA65
T STA66
R STA66
T STA67
R STA67
T STA68
R STA68
T STA69
R STA69
T STA70
R STA70
T STA71
R STA71
T STA72
R STA72
N.C.
N.C.
*Expansion
Unit #3
T STA73
R STA73
T STA74
R STA74
T STA75
R STA75
T STA76
R STA76
T STA77
R STA77
T STA78
R STA78
T STA79
R STA79
T STA80
R STA80
T STA81
R STA81
T STA82
R STA82
T STA83
R STA83
T STA84
R STA84
T STA85
R STA85
T STA86
R STA86
T STA87
R STA87
T STA88
R STA88
T STA89
R STA89
T STA90
R STA90
T STA91
R STA91
T STA92
R STA92
T STA93
R STA93
T STA94
R STA94
T STA95
R STA95
T STA96
T STA96
N.C.
N.C.
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Table 1 - Background Music Options
Background Music
Stations Main Board SW1
1-6 SW1-1
7-12 SW1-2
13-18 SW1-3
19-24 SW1-4
25-30 SW1-1
31-36 SW1-2
37-42 SW1-3
43-48 SW1-4
49-54 SW1-1
55-60 SW1-2
61-66 SW1-3
67-72 SW1-4
73-78 SW1-1
79-84 SW1-2
85-90 SW1-3
91-96 SW1-4
Expansion Board 1:
Expansion Board 2:
Expansion Board 3:
Table 2 - Numbering Plan
Switch OFF Switch ON
No BGM group 1 BGM group 1
No BGM group 2 BGM group 2
No BGM group 3 BGM group 3
No BGM group 4 BGM group 4
No BGM group 5 BGM group 5
No BGM group 6 BGM group 6
No BGM group 7 BGM group 7
No BGM group 8 BGM group 8
No BGM group 9 BGM group 9
No BGM group 10 BGM group 10
No BGM group 11 BGM group 11
No BGM group 12 BGM group 12
No BGM group 13 BGM group 13
No BGM group 14 BGM group 14
No BGM group 15 BGM group 15
No BGM group 16 BGM group 16
2 Digit Zone Access:
Dial Code Function
10..33 Handsfree speakers - Main board
34..57 Handsfree speakers - Expansion board 1
58..81 Handsfree speakers - Expansion board 2
82..99 * Handsfree speakers - Expansion board 3 (1st 18 sta.)
"**" during hf to
zone 30,31,32, or 33
(Station 1 = code 10, station 2 = code 11, and so on)
Operate relay for longer of 2.5 seconds or duration of
second press, or until attendant releases hf.
3 Digit Zone Access:
Dial Code Function
101..124 Handsfree speakers - Main board
125..148 Handsfree speakers - Expansion board 1
149..172 Handsfree speakers - Expansion board 2
173..196 Handsfree speakers - Expansion board 3
"**" during hf to zone
121, 122, 123, or 124
(Station 101 = code 101, station 102 = code 102, and so forth)
Operate relay for longer of 2.5 seconds or duration of
second press, or until attendant releases hf.
*If the 2-digit dialing option is enabled in a system with 3 expansion units, the maximum number of zones
is 90.
The 3-digit dialing option must be enabled to access 96 zones.
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Table 3 - Page Dial Codes:
Dial Code Main Board Expansion 1 Expansion 2 Expansion 3
#10
external all
call
#11
system all
call
#!2
#13
#14
#15
#16
#17
*
#60
#61
#62
#63
#64
#65
#66
#67
#68
#70
#71
#72
#73
#74
#75
#76
#77
#78
#79
#80
#81
#82
#83
#84
#85
12345678910111213141516
Example: #60 + 72 + 74 + … + * Serial Group Call - User may select any combination of group codes during dialing
Groups
• Group 10 (External All Call) is not a valid group selection when using these dial codes
NOTE: For Group selection and Background Music Programming:
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Group 7
Group 8
Group 9
Group 10
Group 11
Group 12
Group 13
Group 14
Group 15
Group 16
Stations 1 – 6
Stations 7 – 12
Stations 13 – 18
Stations 19 – 24
Stations 25 – 30
Stations 31 – 36
Stations 37 – 42
Stations 43 – 48
Stations 49 – 54
Stations 55 – 60
Stations 61 – 66
Stations 67 – 72
Stations 73 – 78
Stations 79 – 84
Stations 85 – 90
Stations 91 - 96
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Problem Corrective Action
No system operation.
No paging at speaker.
Paging at speaker but no reply from
speaker.
No system ringing when call button is
pressed.
Background music not heard at speakers.
No dial tone.
TROUBLESHOOTING CHART
• Verify AC voltage is present at the receptacle.
• Check the fuse located on the bottom of the unit. If blown, replace with
a 1 amp, 250 VAC fuse.
• Verify that 25 pair cable connectors are completely plugged into circuit
board connectors.
• Refer to Figure 1 and verify all connections.
• Refer to Figure 1 and adjust volume.
• Refer to Figure 1 and adjust volume.
• Verify all associated connections.
• Verify connection of speakers and background music input.
• Refer to dip switch settings.
Valcom, Inc. warrants its products to be free from defects in materials and workmanship under conditions of normal use and
service for a period of one year from the date of shipment. The obligation under this warranty shall be limited to the replacement,
repair or refund of any such defective device within the warranty period, provided that:
1. inspection by Valcom, Inc. indicates the validity of the claim,
2. the defect is not the result of damage, misuse, or negligence after the original shipment,
3. the product has not been altered in any way or repaired by others and that factory sealed units are unopened
(A service charge plus parts and labor will be applied to units defaced or physically damaged),
4. freight charges for the return of products to Valcom are prepaid,
5. all units 'out of warranty' are subject to a service charge. The service charge will cover minor repairs
(Major repairs will be subject to additional charges for parts and labor).
This warranty is in lieu of and excludes all other warranties, expressed or implied, and in no event shall Valcom, Inc. be
liable for any anticipated profits, consequential damages, loss of time or other losses incurred by the buyer in
connection with the purchase, operation or use of the product.
This warranty specifically excludes damage incurred in shipment. In the event a product is received in damaged condition, the
carrier should be notified immediately. Claims for such damage should be filed with the carrier involved in accordance with the
F.O.B. point.
Headquarters:
Valcom, Inc.
5614 Hollins Road
Roanoke, VA 24019-5056
Phone: (540) 563-2000
FAX: (540) 362-9800
In Canada:
CMX Corporation
35 Van Kirk Drive #11 and 12
Brampton, Ontario L7A1A5
Phone: (905) 456-1072
FAX: (905) 456-2269
TECHNICAL ASSISTANCE
When trouble is reported, verify there are no broken connections. Assistance in troubleshooting is available from
the factory. Call (540) 563-2000 and ask for Technical Support, or call (540) 767-1555 for Valcom 24-hour
Automated Support or visit our website at http://www.valcom.com.
VALCOM LIMITED WARRANTY
Valcom equipment is not field repairable. Valcom, Inc. maintains service facilities in Roanoke, VA. Should
repairs be necessary, attach a tag to the unit clearly stating company name, address, phone number, contact person,
and nature of the problem. Send the unit to:
Valcom, Inc.
Repair & Return Dept.
5614 Hollins Road
Roanoke, VA 24019-5056
6 947212
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