ZETRON 27 User manual

/
Z E T R 0 N
Model 27 Receiver Monitor Panel
Technical Manual
#025-9186D
EXPERTS IN M IS SIO N-C RITIC A L COM M UNICATION SYSTEMS
[ Z E T R O N )
^ i ■■■■■■■ ■mi

Z E T R 0 N
Model 27 Receiver Monitor P nel
Technic l M nu l
#025-9186D
COPYRIGHT 1991 1992 ZETRON INC.

TABLE OF CONTENTS
Operation ...................................... 1
"Call" LED .................................. 1
"Mute" button and LED
.......................... 1
Speaker volume
............................... 1
Specifications .................................. 1
Installation .................................... 2
Power
..................................... 2
Audio signals ................................ 2
Busy/mute signals ............................. 3
Input level adjustments
......................... 3
Mute level adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Minimum volume level adjustments . . . . . . . . . . . . . . . . . . . 4
Labeling
...................................... 4
Service diagrams ................................. 5
Model 27 receiver monitor panel parts list (901-9233B) .... 5
Model 27 receiver monitor parts list (702-9372E)
........ 6
Model 27 receiver monitor panel schematic (008-9372E)
..... 9
Model 27 receiver monitor panel silkscreen (702-9372E) .... 13

WARRANTY
Zetron Inc. warrants that all equipment sold pursuant to any resultant
agreement shall be free from defects in material or workmanship at the time
of delivery. Such warranty shall extend from the time of delivery for One
Year. Buyer must provide written notice to Zetron within this prescribed
warranty period of any defect; if the defect is not the result of improper
usage service maintenance or installation and equipment has not been
otherwise damaged or modified after delivery Zetron shall either replace
or repair the defective part or parts of equipment or replace the equipment
or refund the purchase price at Zetron's option after return of such
equipment by buyer to Zetron. Shipment to Zetron's facility shall be borne
on account of buyer.
1. Consequential Damages: Zetron shall not be liable for any incidental or
consequential damages incurred as a result of any defect in any equipment
sold hereunder and Zetron's liability is specifically limited to obligation
described herein to repair or replace a defective part or parts covered by
this warranty.
2. Exclusive Warranty: The warranty set forth herein is the only warranty
oral or written made by Zetron and is in lieu of and replaces all other
warranties expressed or implied including the warranty of merchantability
and the warranty of fitness for particular purpose.
COPYRIGHT NOTICE
The software in this product is copyrighted by and remains the property of
Zetron Inc. Reproduction duplication or disclosure is not permitted. No
part of this document may be copied or reproduced in any form without the
prior written consent of Zetron Inc.

MODEL 27 RECEIVER MONITOR PANEL
OPERATION
The Model 27 Receiver Monitor Panel contains two identical and independent
audio circuits: one on the left and one on the right. Each circuit features
four receiver audio inputs each with its own "Call” LED "Mute" LED and
"Mute" button. In addition each circuit has a knob to adjust the overall
volume of the circuit's speaker.
"C ll” LED
When audio traffic is present on a receiver its "Call" LED will blink.
The "Call" LED will illuminate steady if the receiver is being muted
externally. Normally external muting is performed if the receiver is on the
same frequency as a transmitter that is being operated within acoustic
range of the Monitor Panel. External muting prevents audio feedback.
"Mute" Button nd LED
Pressing the receiver's button will mute the receiver's audio. This is
indicated by the illumination of the "Mute" LED. Pressing the button again
will unmute the audio causing the "Mute" LED to extinguish.
Spe ker Volume
The knob under the speaker is the master volume control for the four
receivers associated with the speaker. Turning the knob clockwise will
increase the volume level. Turning the knob counter-clockwise will decrease
the volume level. Turning the knob fully counter-clockwise may not
completely turn off the volume (depending on adjustments made at
instal1 at ion).
SPECIFICATIONS
Power
Size
Weight
Configuration
Busy/Mute Inputs
11 to 16 Volts DC. 0.3 A typ standby 2.0 A max (full
output).
5.25" high 19.00" wide 1.50" deep
5 lb.
Two independent audio circuits each with four mutable
audio inputs summed to feed a single speaker with
volume control.
Each audio input has an associated Busy/Mute Input
which when shorted to ground mutes the audio
input.
1

MODEL 27 RECEIVER MONITOR PANEL
Audio Inputs
Impedance: 10 000 ohms or 600 ohms balanced (60 dB) DC blocking.
Level For Full Output:
-30 to +10 dBm adjustable (unmuted).
Mute Level: 0 to 40 dB adjustable level reduction compared to
unmute.
Frequency Response:
150 to 12K Hz
Speaker Outputs (at 13.8 VDC power 1 kHz tone)
0.2 % typ. distortion at 2 Watts output.
10 % maximum distortion at 5 Watts output.
INSTALLATION
The Model 27 Receiver Monitor Panel is designed to be installed in 19" EIA
compatible rack furniture. The rear cover of the Monitor Panel gives clear
indications of signal names and locations.
Power
The removable screw terminal block Jl located near the center of the rear
cover is used to route power to the Panel. 11 to 16 Volts DC should be
used. The positive lead should connect to pin 5 or 6 of Jl. The negative
lead (which is also connected to chassis) should connect to pin 7 or 8 of
Jl. When the Panel is used in conjunction with other Series 4000 products
it may share the power from those products. Keep in mind that if full
output power is desired the Monitor Panel may draw as much as 2.0 Amperes.
Audio Sign ls
Both circuits labeled "Left" and "Right" have four receiver audio
channels labeled "A" "B" "C" and "D". These correspond to the Buttons
and LEDs on the front of the Panel as follows: top=’'A" next down="B" next
down="C" and bottom="D".
Each receiver audio input is transformer coupled with a DC blocking
capacitor in series. The impedance of the audio input is 600 ohms as set at
the factory. The impedance may be altered to 10K ohms by changing jumpers
located on the circuit board to the "B" position.
Audio signal pairs are connected to the panel using removable screw
terminal blocks Jl J2 and J3 as follows:
Channel B1 ock Pins Impedance Jumper
Right-A Jl 3&4JP1
Right-B J2 3& 4 JP2
Right-C J2 7 & 8 JP3
Right-D J2 11
&
12 JP4
Left -A Jl 11 &
12 JP5
Left -B J3 3
&
4 JP6
Left -C J3 7
&
8 JP7
Left -D J3 11 & 12
JP8
2

MODEL 27 RECEIVER MONITOR PANEL
Busy/Mute Sign ls
Each receiver audio input has an associated Busy/Mute input which when
shorted to ground will completely mute the audio input and steadily
illuminate the receiver's "Call" LED. This is most often used if the
associated receiver is monitoring the same frequency as a transmitter that
is operated from a location within acoustic range of the Monitor Panel. The
Busy/Mute input is usually derived from the PTT signal of such a
transmitter.
Busy/Mute signal pairs (labeled "X-Busy" on the rear cover) are connected
to the panel using removable screw terminal blocks Jl J2 and J3 as
fol1ows:
Channel B1 ock Pins
Right-A Jl 1 & 2
Right-B J2 1&2
R i g h t - C J2 5 & 6
Right-D J2 9&10
Left -A Jl 9 &10
Left -B J3 1 & 2
Left -C J3 5 & 6
Left -D J3 9& 10
Input Level Adjustments
Each receiver audio input has two adjustments; the "Input Level" and the
"Mute Level".
1 he "Input Level" adjustment is a four-turn trim potentiometer located
within the cut-out area of the rear cover. Turning this pot clockwise will
decrease the attenuation of the input signal. When turned fully clockwise a
-30 dBm level (25 mVrms) will be capable of producing the full 5-Watt
rating on the associated speaker.
Recommended Procedure: Turn the "Input Level" adjustment fully counter
clockwise (no more than four turns or until clicking is heard). Place a
signal of typical level across the associated audio input pair while
observing the associated "Call" LED. Turn the "Input Level" adjustment
clockwise until the "Call" LED begins to blink. Turn the adjustment one
additional turn clockwise to ensure proper dynamic range of the "Call" LED.
Once each of the four inputs have been adjusted it may be desirable to
compare the listening level of each and readjust the "Input Level" to bring
all inputs to a comparable listening level.
3

MODEL 27 RECEIVER MONITOR PANEL
Mute Level Adjustments
The "Mute Level" adjustment is a single turn potentiometer located next to
the associated "Input Level" pot. Turning this pot clockwise will decrease
the attenuation of the mute level. This adjustment sets the mute level
relative to the "Input Level" adjustment (i.e. the absolute mute level is
affected by the "Input Level" adjustment).
In order to adjust the "Mute Level" the associated mute function must be
activated by pressing the "Mute" Button such that the "Mute" LED turns on.
The "Mute Level" may then be adjusted to the desired listening level. If
full mute is desired the adjustment should be turned fully counter
clockwise.
Minimum Volume Level Adjustments
Each speaker has a "Minimum Volume Level" adjustment. This allows the
setting of the lowest volume achievable when the master knob on the front
panel is turned fully counter-clockwise. When this single turn trim
potentiometer is turned fully counter-clockwise the minimum volume level is
zero (no sound). Turn the trim pot clockwise in order to increase the
minimum volume level above zero.
LABELING
The "Mute" Buttons feature removable transparent covers. It is suggested
that labels be inserted under the covers which identify the name of the
associated receiver.
4

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NQTESi
1. TEST AND CALIBRATE ACCORDING TO
PROCEDURE 02Q-C12 .
0=0 CUT WIRE, ITEM 16, INTO FOUR 4' PIECES,
SOLDER 2 TP EACH SPEAKER. ITEM 13, CONE
PER TAB>. CRIMP THE OTHER
ENDS TO IDC CONNECTOR, ITEM 15.
GD INSTALL IDC CONNECTOR, ITEM 15, INTD JP9
AND JP10 OF BOARD, ITEM 2 .
£T> SECURE U19, U20, U28, U29 TO BOARD
ITEM 2 , AND FRONT PANEL. ITEM 19,
VITH SCREVS, ITEM 5,
GO PLACE ITEMS IN PLASTIC BAG, ITEM 23.
SO PLACE ITEMS IN PLASTIC BAG ITEM 24,
, PLACE UNIT IN BAG ITEM 25,
EO PLACE LABEL ITEM 1 , ON BACK OF UNIT.
2 i 02-93 2 M2 REC, MON, BOARD
26 A/R 561-0003 ADHESIVE
25 1449-9052 BAG PLAS, 10X8X24 1,5 GA
24 1449-9042 BAG PLASTIC 2X3 ,004 GA
23 I449-9019 BAG PLASTIC 5X ,004 G-
22 I449-9016 BOX, CDBD V/FDAM ENDS
21 1416-1202 1FUSE AGC 2A
20 1415-9504-1 M2 DL MN PN REAR COY
19 1415-9582-1 M2 REC MN FRDMT PANE_
18 2415-9193 M20 TBLTOP SPEAKER GRI_
1 1415-9003 DECAL. TI-5100 PN/SN/IFT
16 16' 408-2201 22 GA, VIRG VHITE
15 2 401-01 5 2 COND IDC, 26 GA X .1
14 3401-0016 12 PDS BLOCK FEMALE
13 2 305-0021 SPEAKER 4 OHM 5V
12 2 265-0013 CAP FOR 265-0012
11 2 265-0012 KNOB V / INDICATOR BLK
10 251-1239 440X.031 NYLON
9250-0105 440X3/8 V/STUL
8250-0103 440X3/4 V/STUD
4236-0004 VASHER, NYLON *10 BLftC*.
64220-0250 1032X3/4 FLT HD PHIL
54220-0108 440X1/4 PAN PHILLIPS
410 220-010 440X3/16 PAN PHILLIPS
38210-0001 440 KEPT NUT PG4TED
21108-0000 A' 1GNMENT TOOL
11025-9186 k? REC. MflN PAN. MANUAx.
ITEM QTY. PART « ! DESCRIPTION
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5

MODEL 27 RECEIVER MONITOR PANEL
Model 27 Receiver Monitor P rts List (702-9372E)
LEGEND:
i = NOT INSTALLED
A = INSTALLED ON HIGHER ASST
+ = OPTION (INSTALLED PER CUSTOMER ORDER)
ITEM
m
COMPONENT REFERENCE PART NO. DESCRIPTION MANUFACTURE P/N
1 6 R4 R42 R123 R130 R163
R176 101-0010 1 OHM 1/4W 5* CARBON FILM 1/4-51
2 4 R12Q R128 R132 R175 101-0013 2.2 OHM 1/4W 5* CARBON FILM
314 R18 R40 R57 RB1 R96
, R115
R127 R129 R131 R140 R160
R170 R171 R172
101-0057 220 OHM 1/4W 5% CARBON FILM
4 2 K179 R1SQ 101-0061 330 OHM 1/4W 51 CARBON FILM
5 8 R6 R23 R24 R64 R65 R70
R103 R104 101-0068 620 0 1 1/4W 51 CARBON FILM
6 18 R10 R12 R32 R34 R46 R48
R73 R75 R87 R89 R1Q7
R109 R125 R133 R152 R154
R174 R178
101-0073 IK 1/4W 5? CARBON FILM
78R22 R44 R61 R85 R100
R119 R144 R164 101-0085 3.3K 1/4W 5% CARBON FILM
8 52 Rl# R2 R3|lR5fR7(R8(R9
Rll R13/RI4lR16 R21 R25i?y
R26yS27 R28 R29yR30 R31#J
R33 R35 R36(R37 R45 R47
R49 R50(E55 R60 R68 R69
R74/R76 R77 R78 R86 R88/
R90 R91 R94 E99 R108
R110 S111 R112 R134 R135
R136 R138 R143 R153 R155
R156 R158 R165 R177
101-0097 10K 1/4H 51 CARBON FILM
9 1 R149 101-0105 22K 1/ffl 5% CARBON FILM
10 1 R148 101-0121 100K 1/4W 5% CARBON FILM
11 8R19 R41yR58 R82 R97 R116
R141.R161 101-0125 150K 1/4W 5% CARBON FILM
12 10 R15 R17# R38(R39# R54#
R56# R79 R80# R93 R95$
R1I3 R114# R122IR137
R139# R157 R159# R167
101-0145 1M 1/4W 51 CARBON FILM
13 2 E173 R126 107-0002 10K R0T0SY POT RH1631110-1O KB
14 2R169 R121 107-0202 2K POT 1 TURN 3386P-1-202
15 8R53 R63 R67 R72 R102
R106 E147 R151 107-0502 50K POT 1 TURN 3386P-1-503
16 2 R166(R124 107-0504 20OK POT 1 TURN 3386P-1-204
17 8 R52/R62 R66 R71JR101
R105 R146 R150 108-0103 10K POT 4 TURN 1102P-1-103K
18 8 C4 C15 C17 C23 C26 C42
048 C55 150-0096 1000 PF 1KV 1-20! CERAMIC DISC GE-102G
19 1C56 150-0110 .01 UF 50V 80%-20% CERAMIC DISC DF-1032
6

MODEL 27 RECEIVER MONITOR PANEL
Model 27 Receiver Monitor P rts List (702-9372E) cont'd
ITEM QTY COMPONENT REFERENCE PART NO. DESCRIPTION MANUFACTURE P/N
20 8 C1 C12 C16 C22 C24 C25
C30 C47 151-0180 .1 OF 50V 4-101 CERAMIC UNSTABLE AVXSR205E104MAA
21 4C34 C35 C49 C52 151-0181 .1 UF .1 SPACE 50V CERAMIC TEMP. STABLE CW20C104K
22 2C58 C59 151-0199 .47 UF 50V 4-51 POLYESTER ECQVIH474JZ
23 «05 06 010 011 018)019
020 021 152-0030 2.2 UF 250V 4-101 POLYESTER ECQ-E2225KS
2 4 2053 037 152-0085 .01 UF 50V 4- 5% POLYESTER ECQ-V1H103JZ
20 11 02 03 09 013 014 036 040
041 045 046 054 154-0025 1 UF 35V TANTALUM ECS-F-35E1
26 4027 031 033 038 154-0100 10 UF 16V TANTALUM ECS-FICE1Q6K
27 408 043 044 057 155-0052 10 UF 35V 4-201 RADIAL ALUMINUM ELECTROLYTIC ECEA1VU100
28 307 028 051 155-0077 100UF 25V 4-201 RADIAL ALUMINUM ELECTROLYTIC ECEA1EU101
20 4 029 032 039 050 155-0083 470 UF 10 VOLT RADIAL ALUMINUM ELECTROLYTIC ECEA-1AU471
30 8 T1 T2 T3 T4 T5 T6 T7 T8 305-0103 10K:10K OHM AUDIO HR671-1459
31 16 DS1 DS2 DS3 DS4 DS5 DS6
DS7 DS8 DS9 DS10 DS11
DS12 DS13 DS14 DS15 DS16
311-0022 LED RED T-l LTL-4221
32 2VR) VR2 316-0005 REGULATOR 5V LOW POKER LK78L05
33 4(119 1120 U28 U29 316-2003 8W AUDIO AMP HORIZ MOUNT TDA2002H
34 1! U2 06 118 U12 U14 018 022
U27 316-3403 QUAD OP AMP MC3403P
35 4U1 05 U.13 U17 323-4013 DUAL D-FF KC14013B
36 8U3 U4 U9 U10 U15 U16 U23
U25 323-4053 3PDT SWITCH MC144053
37 5U7 Ull 021 1)24 U26 323-4093 QUAD N M D SCHMITT MC14093B
3B 8 Ql Q3 Q5 Q7 Q10fQ12 Q14
Q16 340-3904 NPN 40V/200MA 2N3904
39 BQ2 Q4rQ6 Q8 Q9 Qll Q13
Q15 340-3906 PNP 4QV/20QMA 2N3906
40 10 CR1 CR2 CR3 CR5 CR6 CR7
CR8 CR9 CR10 CR11 342-3009 SILICON .50 SP 1N4148
41 1CR4 343-3108 1W 15V 4-5! .50 SP 1K4744A
42 R SW1 SW2 SW3 SW4 SW5 SW6
SW7 GWfl 371-0003 SINGLE KEY-NO LIGHT JM2005I01
43 3 J1 J2 J3 401-0015 12 POS BLOCK MALE 1103.6
44 0 PI
}
401-0079 6 PIN TELCO PER? 520258-3
4') 2 JP10 JP9 403-0002 2 OF 401-0052
46 0 JP1 JP2 JP3 JP4 JP5 JP6
JP7 JP8 403-0003 3 OF 401-0052
47 1FI 416-6025 FUSE AGC 2.5ASB-LITTLEFUSE MDL 2.5ASB
48 16 XDS1 XDS2 XDS3 XDS4
XDS5 XDS6 XDS7 XDS8
XDS9 XDS1.0 XDS11 XDS12
XDS13 XDS14 XDS15 XDS16
251-3125 440x5/16 SPACER
7

MODEL 27 RECEIVER MONITOR PANEL
Model 27 Receiver Monitor P rts List (702-9372E) cont'd
ITEM QTY COMPONENT REFERENCE PART NO. DESCRIPTION MANUFACTURE P/N
49 8XJP1/XJP2 XJP3 XJP4 402-3040 MINI JUMPER
XJP5 XJP6 XJP7 XJP8 (POS A)
50 17 M XD2 XU5 XU6(XU7 XU8
XU11 XY12 f XU13 XU14 f XU17
XU18 XU21 XU22 XU24 XU26
XU27
407-0014 SKT 14 PIN DIP
51 8 XU3#XU4 XU9fXU10 XI115(
XU16 fXU23 XU25 407-0016 SKT 16 PIN DIP
52 2 J6-J7 J17-J18 408-0001 WIRE JUMPER
53 1PCB 410-9372C PCB DUAL MONITOR SPEAKER BOARD
54 2XF1 416-3040 FUSE CLIPS
8

SHEET 2
RST ►
BLINK ►
►left L-AB ►
L—A+ ►
L -A -»
►RIGHT R—A8 ►
R—A+ ►
R -A -fc
. .... . ...... i
00893722.SCH
SHEET 3
>RST
►BLINK
►L-AB
► L-A +
► L-A-
LEFT ►-
O 0 B937 2 3.SCH
REV DESCRIPTION DR APBO DATE
ARELEASE Rn 1
HCN 1604 KN
cHCN 1695A □ W
D HCN 1790 KM
. e
________ HCN 1 B 40 ______
DW > •
SHEET A
NOTES: UNLESS OTHERWISE SPECIFIED.
1. ALL CAPACITORS ARE IN MICROFARADS.
2. ALL RESISTORS ARE IN OHMS. 1/4W. 5%.
3. ALL POTENTIOMETERS ARE 1 TURN. !
I UNUSED PARTS: 1 ' S
I
--- ---
-►RST
-►BLINK
-►R-A3
-►R-A+
-►r-a-
OOBS37H4.SCH
RIGHT!
B
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9
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13
if V ^ -
---- ' U24C T
---- ^ U24D
4093 4093
I
LEGEND: ~T
OPTION INSTALL PER
CUSTOMER ORDER.
INSTALLED ON
HIGHER ASSEMBLY .
* NOT INSTALLED.
.x_______ CUT TRACE.
JUMPER WIRE.
2ETR0N. INC.
12335 134TH COURT N.E.
REDMOND. WASHINGTON 98052-2433
Title MODEL 27 RECEIVER MONITOR PANEL
Size Document Number PEV
B008—9372 E
Date: ADrll 7. 1992 ISheet 1 o f 4
9

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ZETRON INC.
Title MODEL 27 RECEIVER MONITOR PANEL
Size
BDocument Number 00B — 9372 REV
E
Dote; Sectember 15. 1992 iSheet _ g of 4
10

11

RIGHT >
ZETRON INC.
Title MODEL 27 RECEIVER MONITOR PANEL
Size
BDocument Number OOB — 9372
REV
E
Dote: September 15. 1992lSheet A of
___ 4.
1 2

ZETRON DUAL MONITOR SPEAKER BOARD SUSCREEN
13

IZE TR D N ) Technical In ormation
Battery Disposal Instructions
Information on Disposal of Old Electrical and Electronic E uipment and
Batteries (applicable for EU countries that have adopted separate waste
collection systems)
- .r- t - Products and batteries with the symbol (crossed-out
K-r-f wheeled bin) cannot be disposed as household
F H waste. Old electrical and electronic equipment and
batteries should be recycled at a facility capable of
— —— handling these items and their waste byproducts.
Contact your local authority for details in locating a
recycle facility nearest to you.
Proper recycling and waste disposal will help
conserve resources whilst preventing detrimental
effects on our health and the environment.
Notice: The sign “Pb” below the symbol for
batteries indicates that this battery contains lead.
011 0793A 1 of 1

Z E T R O N U S A
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Redmond, WA
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USA
TEL [phone]
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