AUSTRALIAN MONITOR AMIS250 Series User manual

AMIS250 Series Service Manual
Product Description
Set-Up/Test Procedures
Component Lists
Full Schematics
PCB Overlays
Australian Monitor. Private Bag 149 Silverwater NSW 1811. Australia
www.australianmonitor.com.au

AMIS250
Circuit Description
The AMIS250 mixer amplifier is designed for commercial installations. It operates on [230/240 VAC,
50Hz] (240V version)/[115VAC, 60Hz] (115V version) and may be desk or rack mounted (rack mount kit
supplied). The AMIS250 delivers 250 watts into a load of 4 ohms, [70 or 100 volt line] (240V version)/ [25
or 70 volt line] (115V version). As standard, the AMIS250 is supplied self standing with rubber feet. It
features 6 microphone/line input channels as well as a host of unique features including multiple levels of
muting and 24 VDC make the AMIS250 a very flexible amplifier. [The 115V version also has a
transformer balanced, 600 ohm telephone input] (115V version).
Power Switch
This switch controls the switching of AC power to the amplifier. A blue ‘On’ LED will indicate whether
the amplifier is switched on or off. This switch will not switch DC power on or off in DC operation. In DC
operation mode, the amplifier is always on and the blue power LED will always be illuminated.
Protect LED
A feature of the AMIS250 is high temperature protection. In most applications, the internal cooling fan will
most probably never switch on. When used with demanding speaker loads or in difficult operating
environments, the fan may regularly switch on to cool the amp down and then switch off again. This
switching on and switching off is quite normal. The “Protect” function is there to protect the amplifier from
high temperature problems which would only occur if the fan stopped working or became clogged up. In
this very rare occurrence, the amplifier will shut down and the protect LED will illuminate. The amplifier
will automatically restart once it’s internal temperature has fallen below the fan switch on temperature.
The fan switch on temp is preset at 60degC by the trimmer on the power amp board R58 (10k) and the
NTC R25 (10k@25degC).
The high temperature trip point is set at the factory by trimmer R58. Turning the trim pot clockwise will
cause the amplifier to trip and mute at a lower temperature.
AC Power Inlet
The operating voltage is [230/240 VAC @ 50 Hz] (240V version)/[115 VAC @ 60Hz] (115V version). The
3 pin IEC power inlet is located on the bottom left of the rear panel and accepts a standard mains power
lead fitted with an IEC connector. Before plugging in a power lead, please check the rear panel of the
amplifier to ensure that the voltage switch is set correctly for your part of the world.
The inlet is equipped with an in-built AC fuse holder fitted with a [6.3 amp] (240V version)/[8 amp] (115V
version) fuse plus a spare within the holder. Power consumption is 550 VA.
24 Volt DC Power Inlet
The AMIS250 features optional 24VDC power to run off a battery supply if required. This is connected via
the rear terminal strip. The front panel Power Switch will not switch DC power ‘on’ or ‘off’ in DC
operation. In this mode the amplifier is always ‘on’.
[230V/240V Slide Switch] (240V version)
The operating voltage of the amplifier is user selectable between 230V and 240V via a slide switch located
on the right of the AC inlet. This switch should be set to match the AC voltage of your country. The mains
transformer is wound with a 230V winding plus a 10V winding internally connected.
Power Amp
The power amp is a push pull single supply amplifier driving a centre tapped transformer. The amplifier
has an overall gain of approximately x10 and the transformer has a turns ratio of approximately [x7] (240V
version)/[x5] (115V version). The sensitivity of the amp is approximately 2.7V.

A particularly good aspect of this amplifier is the current limiting circuit. The sensing circuit is a standard
rail load line limiting circuit but it is the drive circuit that is important. As transistors V12 & V6 (BC640)
turn on transistor V11 (BC639), it pulls bias current away from the amp through diodes D1 & D4 (BAV21)
and pulls drive away from the op amp IC1 (LM1458) through the diode/resistor pair D2/R12 (BAV21/3k3)
& D3/R23. Individually each topology acts to limit the current in the amp but it is the combination of the
two and the fine tuning of there interaction that produces the characteristic soft limiting without the harsh
crossover distortion. It is not until the amp is in hard clip does the amp produce the high freq crossover
distortion. This makes for nice sounding current limit that allows for soft distorted peaks to get through but
limits continuous excessive current while maintaining thermal stability.
Speaker Output Terminal Strip
(240V version)
The screw terminals on the left hand side of the strip allow access to the direct speaker outputs of the
amplifier. Reading from left to right the terminals are:
COM Common or “-” for low impedance speaker loads (4 ohms)
4 Positive “+” for 4 ohm speaker loads (use with common)
COM Common or “-” for 70v or100v speaker loads (maximum load of 40 ohms at 100v)
70 Positive “+” for 70v line speaker loads (use with common)
100 Positive “+” for 100v line speaker loads (use with common)
Please ensure that the correct “Common” is used. Low impedance and 70/100v loads can be used
simultaneously but please pay careful attention to the overall speaker load.
Note: The minimum impedance (or maximum load) at 100 volt line should be no less than 40 Ohms.
(115V version)
The screw terminals on the left hand side of the strip allow access to the direct speaker outputs of the
amplifier. Reading from left to right the terminals are:
COM Common or “-” for low impedance speaker loads (4 ohms).
4 Positive “+” for 4 ohm speaker loads (use with common)
COM Common or “-” for 25v or 70v speaker loads (maximum load of 20 ohms at 70v)
25 Positive “+” for 25v line speaker loads (use with common)
70 Positive “+” for 70v line speaker loads (use with common)
Please ensure that the correct “Common” is used. Low impedance and 25/70v loads can be used
simultaneously but please pay careful attention to the overall speaker load.
Note: The minimum impedance (or maximum load) at 70 volt line should be no less than 20.
Terminal Strip
The remaining terminals read as:
Spare
Tone Generator Common (use with one of the 4 tones listed below)
Pre-Announce Chime
Alert Tone
Bell Chime
Evacuation Tone
[600 Ohm Telephone Input] (115V version)

Phantom Power
This button enables or disables the 15 volts DC phantom power to all microphone inputs XLR’s. Do not
plug an unbalanced microphone in any amplifier or mixer when phantom power is switched on.
The phantom voltage is connected through 4k7 1/4W resistors. The maximum current draw available per
microphone is approximately 3mA.
Line Output
The balanced XLR line level output provides a maximum of 700mV to allow for the connection of up to 6
power amplifiers. Pin connections are: pin 1-earth; pin 2-signal (hot +); pin 3-signal (cold -).
The output is electronically balanced with an inverting op-amp and buffered with voltage follower op
amps. Neither hot nor cold output should be grounded when connecting as unbalanced.
Tape Output
Dual RCA output connectors provide a line level output with a maximum of 350mV into 10k Ohms. This
output is sourced before the master gain control so the tape output level is not influenced by the operation
of the master gain control.
Microphone Inputs
All four inputs are dual mic/line with microphone inputs being via a 3 pin XLR connector per channel. The
mic input sensitivity is 1mV @ 200 ohms. Pin connections are: pin 1-earth; pin 2-signal (hot +); pin 3-
signal (cold -). Phantom power of +15 volts is available on all microphone inputs. Reading from left to
right across the rear panel, the inputs are 6,5,4, 3, 2, & 1.
Line Inputs
Line inputs 1, 2, 3, 4, & 5 have an input sensitivity of 150mV @ 100K ohms. Input 6 has an input
sensitivity of 300mV @ 220K ohms making it suitable for high level inputs such as a CD player. Reading
from left to right across the rear panel, the connections are for inputs 6, 5, 4, 3, 2, & 1 respectively.
[600 Ohm Telephone Input] (115V version)
The 600 ohm transformer balanced Telephone Input is summed with input 2 through 100k ohms.
The input sensitivity is 150mV (driving the amp to full power)
Insert Point
The Insert Point is located electronically after the master volume pot and before the balancing circuit for
the power amp and line output.
The Insert Point is a 3 conductor (Tip, Ring, Sleeve) phone socket which accepts a standard stereo 6.35mm
(1/4”) jack. The connections are:
Tip Amplifier in.
Ring Mix Output.
Sleeve Ground
The switched contacts are used to break the signal internally.
When an external processor is used via the insert point, it only affects the power amplifier section and line
output of the AMIS60 &AMIS120. The tape output remains unprocessed.
Tone Generators

Four separate tones are available from the in-built tone generator board. All four tones can be activated
individually via a contact closure connected to the screw terminals on the rear of the amplifier. When any
tone is activated, all inputs (except for inputs 1 and 2) will automatically mute. The level of the tone
generator is controlled by the pot labeled R6 (located behind the Bass adjustment pot). This pot adjusts the
level for all 4 tones.
Tones available on the AMIS250 include:
- Evacuation Tone
- Alert Tone
- Bell Tone
- Pre-Announce Chime
Theses inputs are pulled up to 5VDC internally through 1k resistors.
The tones are generated through a combination of digital frequency modulation and analogue amplitude
modulation. The output of the microcontroller IC7 (PIC16C55A) on pin 6 is a 0-5V square wave of varying
frequency (depending on the tone selected). This signal is amplitude modulated using a VCA IC8
(M5222P). The envelope is controlled by the charging and discharging of the electrolytic capacitor C40
with the sink and sourcing of current on the microcontroller outputs pins 8, 9 & 17.
VOX Muting
This feature provides automatic muting channels 3 & 4 when signal is applied to either channels 1 or 2. It is
normally used so that a paging microphone can have priority (by muting) over background music. The
muted channels will automatically ramp back up to normal volume when the signal on channels 1 and/or 2
is no longer active. The amplifier ships with the VOX muting function enabled. To disable the VOX
muting move the jumper (labeled JP2, located just to the left and behind the level pot for channel 1) to the
middle and rear pins. (Factory setting is with VOX enabled with the jumper on the middle and front pins).
Channels 3, 4, 5 & 6 are summed through IC1A (LM1458 or equivalent) to the VCA IC4 (M5222P) which
does the muting. The VCA is held on (i.e. no attenuation) by R22 (10k) pulled to the reference voltage and
the reverse biasing of diode D2 (BAV21 or equivalent) by R20 and R21. This is to eliminate any
attenuation by the op amp IC1B (LM1458 or equivalent) and its ½ supply which may be different to the
internal reference voltage of the VCA.
The control pin of the VCA is pulled down by op amp IC1B. This op amp runs at very high gain to activate
on even very small signal. The jumper JP2 shorts out the feedback resistor thus removing the sensitivity.
The attack of the muting circuit is controlled by the charging of C13 (47uF) through R20 (100k) and the
release by the discharge if C13 through R16 (2k2). Note that VCA will mute at 250mV (-80dB) below the
reference voltage so the muting will occur only over the range of approximately (depends on VCA
production batch) 7.2V to 7.5V. The charging of the capacitor occurs from approximately 1V to 8.1V.
VCA M5222P pin out
1 – Output1
2 – Input1
3 – Reference voltage (½ Vcc)
4 – Gnd
5 – Control
6 – Input2
7 – Output2
Note: The M5222P is a current in, current out device. Voltage conversion is done through resistors. The
maximum input current is 50uA rms. Current gain is 0.5.
Fuse Sizes
(240V version)
Mains: 230 VAC 6.3 Amperes Slow Blow

DC: 10 Amperes Slow Blow
(115V version)
Mains: 230 VAC 8 Amperes Slow Blow
DC: 10 Amperes Slow Blow

TEST PROCEDURE MODEL - AMIS 250 (US)
1. Perform physical inspection (Visual Inspection stage).
1.1 Check:
•All screws for tightness (esp. bridge rectifier and transistor bolts),
•Earth connection for good contact (XLR GND to AC earth),
•All wiring points for good contacts (soldering and crimping)
PRETESTING
PRE TESTING SETUP REQUIREMENT
a. Oscilloscope.
b. Variac
c. Multimeter.
d. Load [4Ω]
e. Signal generator
2. Set up amplifier for test :
2.1 Check :
•AC fuses (8A), 20mm
•DC fuses (10A), 20mm
•
2.2 Connect amplifier to :
•Variac (0 VAC),
•Signal generator (mic1, no signal),
•Resistive load ( 4Ωon 4Ωterminal ).
•Connect 24V DC supply externally for the relay on amplifier PCB. (Optional test for 24V DC
operation)
2.3 Reset controls :
•Volume controls to minimum,
•Bass/treble control to center,
•R33 & R34 (Bias adjust pots) Amplifier PCB fully anticlockwise.
3Power up :
3.1 Turn on the power switch and adjust the variac voltage to 115VAC . Watch current meter for
excess current draw. Current should not exceed 0.5A.
3.2 Check DC power supply at the fuses, the measurement should be approximately. 40V (±1.5V)
3.3 Check DC voltage on the mixer board, the measurement should be approximately. 15V (±0.5V).
3.4 Check 1/2 VCC on mixer board, the measurement should be 8VDC (±0.5).
3.5 Measure the DC voltages on the IC’s of the mixer & input PCB's, Pin 8, 15V (+5%), Pin 4 0V
(+100mV),
Pin l, 8V (±5%) but on power it should be P8 18V (±5%) other remain same.
3.6 Put a multimeter across R47, the meter should read 0.3 mV (±5%). Slowly adjust the preset
R 33 so that you measure 2.5mVin addition to the base reading
3.7 Repeat 3.7 for R55 adjusting preset R34.

4AC Check:
4.1 Set signal generator to 1mV. Turn up Mic1 volume control to full. Watch for irregularities
in the output waveform.
4.2 Set output voltage to 35V using the master volume control. Check voltages across the Emitter resistors
(on the output power devices)
4.3 Voltage should be between 150mV – 200mV. Min. and Max. values should be between 33% of the
average value ( i.e. min/max = 0.5mV ).
4.4 Turn the master up to full. Check sensitivity of the microphone inputs. – MIC 1mV (+ 1mV) 32V in a
4Ωload.
4.5 Check the output level of the amplifier using each of the input channels.
4.6 Measure 25V line 70V LINE.
4.7 Check tape outputs (L and R) 300mV (+50mV) (Measure on RCA socket).
4.8 Check line outputs. Approx. (2.0V ±25mV).
5. Function Checks :
5.1 check the position of header links.
a. Vox muting enabled.
b. VCA Con. Disabled.
5.2 Keep signal in CH1 insert ‘INSERT-PLUG’ having external signal of different frequency the out put
should cut off and switch over to applied insert signal, check signal on inset plugs ring terminal with
respective ground should be 300mV. Remove insert plug .
5.3 Check Phantom Switch for on/off operation. Measure Phantom voltage on an XLR inputs ( the
measurement should be 14.5VDC) (Reset the phantom switch)
5.4 Switch off the set connect battery (24V) check for rated out put power (out put signal will clip up
to 2% on battery power)
FINAL TESTING
Requirements for final testing
a. Load 40Ω.
b. Multimeter
c. Oscilloscope
d. Microphone
e. Variac
6Check sensitivity of all channels.
6.2 Mic input (CH1-CH4) = 1mV out put =70V (±5V)
6.3 AUX input (CH1-CH5) = 150mV out put =70V (±5V)
6.4 AUX input (CH6) = 150mV out put = 32.5V (±1.5V)
6.5 Check the Power bandwidth of CH 1 MIC input. – (68Hz ±5Hz – 15KHz ±2KHz).
6.6 Check Bass control @ 100HZ = + 10dB (TOL. +1dB), MID Control + 10dB (TOL. +1dB) and treble @
10kHz = + 10dB (TOL. ±1dB)
6.7 Check that input signal and output signal are in same phase by comparing CH 1 AUX Input and all
other Outputs ( 25V, 70v, 4Ω, 8Ω)

7Priority check
7.2 Plug microphone into input 1 and oscillator to input 3. Check for muting of channel 3.
7.3 Plug microphone into input 2. Check for muting of channel 3.
7.4 Check ‘Mute Disable’ function. Insert Disable / Enable link (Factory set – ENABLE).
8Check 4 tone switched inputs. Set output level of tones to approx. 14Vrms (+ 2V) using Evac tone.
Make sure channel 3 – 6 mutes with any of the tone’s.
9Check telephone input sensitivity for CH2
Tel input =180 mV output =70V (±5V).
10 Increase the signal such that you get 76V & you can see the overload protection coming on with a kink
visible on the sine wave if it is there then reduce the voltage to 35V out and then short output. Release the
shorting and check for the return of output waveform
11 Remove input signal and check for Hum & Noise (<20mVrms).
12 Reset volumes to minimum.
THERMAL CHECK
13 Connect load to the amplifier apply signal such that you get 42Vat out put. Set for thermal shut off at
110°C (+ 5°C)
LISTENING TEST
Requirements for Listening Test Setup :
a. CD Player
b. Speaker
c. Microphone
14 Connect amplifier to the program source and speaker
14.2 Set all input pots at minimum and all tone pots to the centre (12 o’clock) position and check for turn
on thump
14.3 Check CD Player (AUX) inputs each channel and tone controls for each channel
14.4 Check Priority functions: CH 1 over CH 3 – CH 6, CH 2 over CH 3 – CH 6.
14.5 Check that all generated (alert, evacuation) tones function

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File: C:\AMIS60-120 Manual\CD6306-1.DDB Drawn By:
C26
470u
C25
470u
R65
10R
C24
100P
C23
680P
R64
1K
C22
47u C21 4u7
C20
4u7
X3
V2
BC546
R63
100K
R62
10K
R61
2K2
R60
10R
D10
24V
D9
1N4004
V1
BD139
C18
4u7
D8
4V7 R59
4K7
R58
10K
LK2 LK1
C17
4u7
X1
C16
.33u
R57
1K
VCCR40
10K
R39
10K
R30
10K
R26
10K
R25
10K NTC
IC3B
LM1458
IC3A
LM1458
R56
0.047
R55
0.047
R54
0R22
R53
0R22
R52
0R22
R51
0R22
V20
TIP36C
V19
TIP36C V24 TIP36C
V23
TIP36C
R2
4K7
R1
4K7
R50
0R22
R49
0R22
R48
0.047
R47
0.047
R44
0R22
R43
0R22
V22
TIP36C
V21
TIP36C
V18
TIP36C
V16
TIP36C V17 TIP36C
V15
TIP36C
VCC
C19
47u
R46
0R22
R45
0R22
C3
4u7
C8
15000u
R42
0R22
R41
0R22
V13
TIP36C
X2
D5 1N4004
C2
120p
C4
120p
VCC
R31
10R
C10
47u
C7
15000u
IC2
LM7818
C11
100n
R10
1k
R13
1M
R5
10k
R9
47k
R33
100R
R4
3k3
R7
1k
R6
10k
R3
470R
IC1A
LM1458
C1
470n
V7
BC639
V3
BD140
V9
TIP42C
R11
1k
R22
1k
V10
TIP42C
V8
BC639
C6
470n
C5
4u7
IC1B
LM1458
R17
470R
R20
10k
R19
1k
R16
3k3
R34
100R
R14
47k
R15
10k
R21
1M
R24
1k
V4
BD140
V11
BC639
R8
330R
R18
330R
R29
100K
R27
1k
D1
BAV21
D4
BAV21
V12
BC640
C9
10n
R28
2K7
D3 BAV21
D2 BAV21
R12
3K3
R23
3K3
C12
22P
C13
22P
V5
BC639
R35
22K
R36
470k
D6
1N4004
D7
1N4004
C14
47u
C15
47u
RY1
R37
2K7
V6
BC640
R38
1k
V14
TIP36C
C27
1n
C28
1n
8V2
8
7
6
5
4
3
2
1
-
+
FAN
35VDC
QC11
35VDC TO F1 & F2
35VDC FROM BRIDGE
+BAT VIA DIODE
GND BATTERY
GND BRIDGE RECT
QC/9
QC/8
QC/7
QC/6
FROM FUSE F2
OUTPUT TR
QC/2
CT OUTPUT TR
POWER TR
+BAT TERMINAL
OUTPUT TR
QC/1
FROM FUSE F1
GND
FAN
INPUT
1/2VCC
GND
N/C
CUT OUT
FAN ON
TO 24VAC
11
CD6306-1
AMIS 250 POWER AMP
4
8
BP
BP
35VDC
1
2
3
5
6
7
RS
QC10
QC11
QC3
QC4
QC/5
C

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R76
100R
R86
47k
R72
100k
C34
47P
C35
470u
R12
10R
R70
10R
R51
10R
C37
4u7
R54
10R
R71
100R
C6
47u
R69
1K
R68
1K
R67
100R
R59
10K
R10
50K
R5
50K
R58
10K
V3
BC546
D1
R57
470R
R56 R55
1
2
3
4
5
6
7
8
9
10
11
12
13
14 15
16
17
18
19
20
21
22
23
24
25
26
27
28
IC7
16C55
C24
.1u
C23
4u7
R45
10K
C10
4u7
C9
10u
V2
BC546
R15
4K7
R14
3K9
R13
4K7
R6
10K
C26
.47u
R7
10K
R8
10K
R23
10K
R25
50K
R26
50K
R27
50K
R28
50K
R29
22K
R30
22K
C25
4u7
IC2A
LM1458
IC2B
LM1458
R31
100K
R32
1K
R33
100R
R34
6K8 R35 6K8
R36
10K
C27
82P
R38
50K
R39
50K
C28 .03u
C29
2N7
R41
3K3 R42 3K3
R44
1K C31
4u7
R24
10K
C38
4u7
C39
100u
R40
50K
IC8
M5222
R61
10K
C41
22P
C42
22P
XT1
VDD
D6
D7
D8
R66 1K8
R65 220R
R64 100R
R62
100k
C43
.47u C45
.47u
C40
22u
IC9
7805
C36
10u
VDD
VCC
IC1A
1458
IC1B
1458
IC4
M5222
R1
10K
R2
100k
R3
10K
R111M
R17
100k
D5
D9
C4
4u7 C5
4u7
C8
4u7
C13
47u
C14 82p
C15
33p
C16
4u7
VCC
R21
120k
VCC
R37
4K7
R43
1M
R4
6K8 R18 6K8
R19
50K
C1 5N6
C2
.03u
IC3A
LM1458
IC3B
LM1458
R46
10K
R47
10K
R48
10K
R49
39K
R50
1K
R52
1K
R53
1K
C3
4u7
C11
4u7
C21
4u7
C30
4u7
VCC
C32
100P
C33
100P
VCC
C22
47u
VCC
R16
2k2
R20
100k
D2
R22
10k
IC10B
LM358
R73
15k
R74
4k7
VCC
V1
BC546
R60
47k
R63
2k2
IC10A
LM358
R75
47k
R9
33k
C20
4u7
N.R.N.R.
E
R70
+19V
+9V
4X 1K
CH6
CH5
SLOW START
X2/6
X2/5
X2/4
X2/3
X2/1
HI TEMP
HT PTC
FAN PTC
FAN
X2/8
X2/7
X2/2
+19VDC
X3/1
1
AG(1/2VCC)
CH4
CH2
CH3
CH1
AG
AG
AG(1/2VCC)
TAPE OUT
1
2
3
4
8
7
6
5
RS
X1/1
X4/1
EVAC
BELL
ALERT
PRE AN
AG
AG
JP2
1
5VDC
CD6239-1
AMIS250 MIXER
TAPE
OUT
OUT
GND
1
2
3
4
5
8
1
2
3
4
5
8
X5/1
INSERT POINT

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A3
Date: 12-Feb-2003 Sheet of
File: C:\AMIS60-120 Manual\CD6238-11.DDB Drawn By:
C29
4u7(NP)
C28
4u7(NP)
C26
4u7(NP)
C24
4u7(NP)
C23
4u7(NP)
C22
4u7(NP)
C13
4u7(NP)
C15
4u7(NP)
C14
4u7(NP)
R55
100K T2 600:600ohm
VCC
VCC
VCC
VCC
C42
.1u
6L
5L
R54
220K
R53
100K
R52
4k7 R51 4k7
R50
10R
R49
4K7
R48
4K7
6XLR
5XLR
IC3A
LM1458
IC3B
LM1458
R47
680R
R46
680R
R45
100K
R44
22K
R43
22K
R37
22K
R36
22K
R35
220K
R34
680R
R33
680R
C41
4u7
C40
4u7
C39
4u7
C38
4u7
C37
150P
C36
150P
C35
150P
C31
150P
C27
4u7
5R
C32
4u7
D1
R32
10K
R31
10K
L
R
4R
3R
2R
1R
C21
4u7
C20
150P
C19
150P
C18
150P
C17
150P
C16
4u7
C12
4u7
C8
150P
C7
150P
C6
150P
C5
150P
C4
4u7
R22
680R
R21
680R
R20
22K
R19
22K
R18
22K
R12
22K
R4
100K
R17
100K
R16
680R
R15
680R
R14
680R
R13
680R
R11
100K
R10
22K
R9
22K
R6
22K
R5
22K
R3
100K
R2
680R
R1
680R
IC2B
LM1458
IC2A
LM1458
IC1B
LM1458
IC1A
LM1458
1XLR
2XLR
3XLR
4XLR
R7
4K7 R8
4K7
R23
4K7 R24 4K7
R25
4K7 R26 4K7
R27
10R
R29
4k7 R30 4k7
R38
100K
R39
100K
R40
100K
R41
100K
1L
2L
3L
4L
C33
.1u
C34
.1u
R42
10R
R28
100R
R56
100R
R57
100R
C43
4u7
C45
100u
7XLR
F1
10A SB
F2
10A SB
C25
.1u
VCC
V1
78LS18
6R
C1
4u7(NP)
C2
4u7(NP)
C3
4u7(NP)
C9
4u7(NP)
C10
4u7(NP)
C11
4u7(NP)
TELEPHONE INPUT (US only)
X2
AMIS 250 MIC INPUT
CD6238-1
CH 6 OUT
CH 5 OUT
AG
AG
AG
AG
AG
AG
12
3
4
76
5
8
+15V
PHANTOM
SW1
X1/1
(CD)
CH 4 OUT
CH 3 OUT
CH 2 OUT
CH 1 OUT
TAPE OUT
AG(1/2 VCC)
+VCC
+15V
8
8
5
67
4
3
21
5
67
4
3
21
RS
GND
GND
LINE OUT
X2/1
19VDC
+45VDC A
B
C
!
!
D

AMIS250 Power amp Component List
Designato
r
Part Type Description Manufacturer's Code
C1 470n Metalised Poly 100V 2124262472
C10 47u Electrolytic 35V 2121250470
C11 100n Metalised Poly 100V 2124282101
C12 22P Multi Layer Ceramic 100V 2127181220
C13 22P Multi Layer Ceramic 100V 2127181220
C14 47u Electrolytic 35V 2121250470
C15 47u Electrolytic 35V 2121250470
C16 .33u Metalised Poly 100V 2124282331
C17 4u7 Electrolytic 35V 2121230479
C18 4u7 Electrolytic 35V 2121230479
C19 47u Electrolytic 35V 2121250470
C2 120p Multi Layer Ceramic 100V 2127180121
C20 4u7 Electrolytic 35V 2121230479
C21 4u7 Electrolytic 35V 2121230479
C22 47u Electrolytic 35V 2121250470
C23 680P Multi Layer Ceramic 100V 2127181681
C24 100P Multi Layer Ceramic 100V 2127181101
C25 470u Electrolytic 50V 2121250470
C26 470u Electrolytic 50V 2121250470
C27 1n Multi Layer Ceramic 100V 2122250017
C28 1n Multi Layer Ceramic 100V 2122250017
C3 4u7 Electrolytic 35V 2121230479
C4 120p Multi Layer Ceramic 100V 2127180121
C5 4u7 Electrolytic 35V 2121230479
C6 470n Metalised Poly 100V 2124262472
C7 15000u Electrolytic 50V 2121250153
C8 15000u Electrolytic 50V 2121250153
C9 10n Metalised Poly 100V 2124182100
D1 BAV21 Small Signal Diode 2133400201
D10 24V Zener Diode 1Watt 2136010240
D2 BAV21 Small Signal Diode 2133400201
D3 BAV21 Small Signal Diode 2133400201
D4 BAV21 Small Signal Diode 2133400201
D5 1N4004 Rectifier Diode 2133440004
D6 1N4004 Rectifier Diode 2133440004
D7 1N4004 Rectifier Diode 2133440004
D8 4V7 Zener Diode 1Watt 2136010479
D9 1N4004 Rectifier Diode 2133440004
IC1A LM1458 Dual op-amp DIP 8 Pin 2152810458
IC1B LM1458 Dual op-amp DIP 8 Pin 2152810458
IC2 LM7818 Regulator T0220 2151370815
IC3A LM1458 Dual op-amp DIP 8 Pin 2152810458
IC3B LM1458 Dual op-amp DIP 8 Pin 2152810458
LK1 Link
LK2 Link
R1 4K7 Resistor, metal film 1/2 watt 9111590472
R10 1k Resistor, metal film 1/2 watt 9111590102
R11 1k Resistor, metal film 1/2 watt 9111590102
R12 3K3 Resistor, metal film 1/2 watt 9111590332
R13 1M Resistor, metal film 1/2 watt 9111590105
R14 47k Resistor, metal film 1/2 watt 9111590473
R15 10k Resistor, metal film 1/2 watt 9111590103
R16 3k3 Resistor, metal film 1/2 watt 9111590332

R17 470R Resistor, metal film 1/2 watt 9111590471
R18 330R Resistor, metal film 1/2 watt 9111590331
R19 1k Resistor, metal film 1/2 watt 9111590102
R2 4K7 Resistor, metal film 1/2 watt 9111590472
R20 10k Resistor, metal film 1/2 watt 9111590103
R21 1M Resistor, metal film 1/2 watt 9111590105
R22 1k Resistor, metal film 1/2 watt 9111590102
R23 3K3 Resistor, metal film 1/2 watt 9111590332
R24 1k Resistor, metal film 1/2 watt 9111590102
R25 10K NTC Thermistor 2111911103
R26 10K Resistor, metal film 1/2 watt 9111590103
R27 1k Resistor, metal film 1/2 watt 9111590102
R28 2K7 Resistor, metal film 1/2 watt 9111590272
R29 100K Resistor, metal film 1/2 watt 9111590104
R3 470R Resistor, metal film 1/2 watt 9111590471
R30 10K Resistor, metal film 1/2 watt 9111590103
R31 10R Metal oxide resistor 2W 2111221100
R33 100R Resistor, metal film 1/2 watt 9111590101
R34 100R Resistor, metal film 1/2 watt 9111590101
R35 22K Resistor, metal film 1/2 watt 9111590223
R36 470k Resistor, metal film 1/2 watt 9111590474
R37 2K7 Resistor, metal film 1/2 watt 9111590272
R38 1k Resistor, metal film 1/2 watt 9111590102
R39 10K Resistor, metal film 1/2 watt 9111590103
R4 3k3 Resistor, metal film 1/2 watt 9111590332
R40 10K Resistor, metal film 1/2 watt 9111590103
R41 0R22 Wire wound 5 watt resistor 2111450228
R42 0R22 Wire wound 5 watt resistor 2111450228
R43 0R22 Wire wound 5 watt resistor 2111450228
R44 0R22 Wire wound 5 watt resistor 2111450228
R45 0R22 Wire wound 5 watt resistor 2111450228
R46 0R22 Wire wound 5 watt resistor 2111450228
R47 0.047 Wire wound 5 watt resistor 2111450177
R48 0.047 Wire wound 5 watt resistor 2111450177
R49 0R22 Wire wound 5 watt resistor 2111450228
R5 10k Resistor, metal film 1/2 watt 9111590103
R50 0R22 Wire wound 5 watt resistor 2111450228
R51 0R22 Wire wound 5 watt resistor 2111450228
R52 0R22 Wire wound 5 watt resistor 2111450228
R53 0R22 Wire wound 5 watt resistor 2111450228
R54 0R22 Wire wound 5 watt resistor 2111450228
R55 0.047 Wire wound 5 watt resistor 2111450177
R56 0.047 Wire wound 5 watt resistor 2111450177
R57 1K Resistor, metal film 1/2 watt 9111590102
R58 10K Resistor, metal film 1/2 watt 9111590103
R59 4K7 Resistor, metal film 1/2 watt 9111590472
R6 10k Resistor, metal film 1/2 watt 9111590103
R60 10R Metal oxide resistor 2W 2111221100
R61 2K2 Resistor, metal film 1/2 watt 9111590222
R62 10K Resistor, metal film 1/2 watt 9111590103
R63 100K Resistor, metal film 1/2 watt 9111590104
R64 1K Resistor, metal film 1/2 watt 9111590102
R65 10R Resistor, metal film 1/2 watt 9111590100
R7 1k Resistor, metal film 1/2 watt 9111590102
R8 330R Resistor, metal film 1/2 watt 9111590331

R9 47k Resistor, metal film 1/2 watt 9111590473
RY1 2P2T Relay 2523120001
V1 BD139 Transistor 2141400139
V10 TIP42C Transistor 2141300042
V11 BC639 Transistor 2144200639
V12 BC640 Transistor 2144200640
V13 TIP36C Transistor TOP-3 2141600036
V14 TIP36C Transistor TOP-3 2141600036
V15 TIP36C Transistor TOP-3 2141600036
V16 TIP36C Transistor TOP-3 2141600036
V17 TIP36C Transistor TOP-3 2141600036
V18 TIP36C Transistor TOP-3 2141600036
V19 TIP36C Transistor TOP-3 2141600036
V2 BC546 Transistor 2144200546
V20 TIP36C Transistor TOP-3 2141600036
V21 TIP36C Transistor TOP-3 2141600036
V22 TIP36C Transistor TOP-3 2141600036
V23 TIP36C Transistor TOP-3 2141600036
V24 TIP36C Transistor TOP-3 2141600036
V3 BD140 Transistor 2141400140
V4 BD140 Transistor 2141400140
V5 BC639 Transistor 2144200639
V6 BC640 Transistor 2144200640
V7 BC639 Transistor 2144200639
V8 BC639 Transistor 2144200639
V9 TIP42C Transistor 2141300042
X1 SIL8
X2 SIL2
X3 SIL2

AMIS250 Mixer Component list
Designato
r
Part Type Description Manufacturer's Code
C1 5N6 Metalised Poly 100V 2124180562
C10 4u7 Electrolytic 35V 2121230479
C11 4u7 Electrolytic 35V 2121230479
C13 47u Electrolytic 35V 2121250470
C14 82p Multi Layer Ceramic 100V 2127181820
C15 33p Multi Layer Ceramic 100V 2127280336
C16 4u7 Electrolytic 35V 2121230479
C2 .03u Multi Layer Ceramic 100V 2127280336
C20 4u7 Electrolytic 35V 2121230479
C21 4u7 Electrolytic 35V 2121230479
C22 47u Electrolytic 35V 2121230479
C23 4u7 Electrolytic 35V 2121230479
C24 .1u Metalised Poly 100V 2128280019
C25 4u7 Electrolytic 35V 2121230479
C26 .47u Metalised Poly 100V 2124262472
C27 82P Multi Layer Ceramic 63V 2127181820
C28 .03u Multi Layer Ceramic 100V 2127280336
C29 2N7 Multi Layer Ceramic 100V 2127181279
C3 4u7 Electrolytic 35V 2121230479
C30 4u7 Electrolytic 35V 2121230479
C31 4u7 Electrolytic 35V 2121230479
C32 100P Multi Layer Ceramic 100V 2127180155
C33 100P Multi Layer Ceramic 100V 2127180155
C34 47P Multi Layer Ceramic 100V 2127181470
C35 470u Electrolytic 35V 2121230471
C36 10u Electrolytic 35V 2121220100
C37 4u7 Electrolytic 35V 2121230479
C38 4u7 Electrolytic 35V 2121230479
C39 100u Electrolytic 35V 2121220101
C4 4u7 Electrolytic 35V 2121230479
C40 22u electrolytic 35V 2121250220
C41 22P Multi Layer Ceramic 100V 2127181220
C42 22P Multi Layer Ceramic 100V 2127181220
C43 .47u Metalised Poly 63V 2124262472
C45 .47u Metalised Poly 63V 2124262472
C5 4u7 Electrolytic 35V 2121230479
C6 47u Electrolytic 35V 2121250470
C8 4u7 Electrolytic 35V 2121230479
C9 10u Electrolytic 35V 2121220100
D1 LED 3.0mm Red Led 2137200003
D2 BAV21 Small Signal Diode 2133400201
D5 BAV21 Small Signal Diode 2133400201
D6 BAV21 Small Signal Diode 2133400201
D7 BAV21 Small Signal Diode 2133400201
D8 BAV21 Small Signal Diode 2133400201
D9 BAV21 Small Signal Diode 2133400201
IC10A LM358 Dual op-amp DIP 8 Pin 2152800358
IC10B LM358 Dual op-amp DIP 8 Pin 2152800358
IC1A LM1458 Dual op-amp DIP 8 Pin 2152810458
IC1B LM1458 Dual op-amp DIP 8 Pin 2152810458
IC2A LM1458 Dual op-amp DIP 8 Pin 2152810458
IC2B LM1458 Dual op-amp DIP 8 Pin 2152810458
IC3A LM1458 Dual op-amp DIP 8 Pin 2152810458

IC3B LM1458 Dual op-amp DIP 8 Pin 2152810458
IC4 M5222 VCA DIP 8 Pin 2153850222
IC7 16C55 PIC-16C55X1,TP,28PIN 2159601655
IC8 M5222 VCA DIP 8 Pin 2153850222
IC9 7805 Regulator, T092 2151270805
R1 10K Resistor, metal film 1/2 watt 9111590103
R10 50K Potentiometer Linear 2021000503
R11 1M Resistor, metal film 1/2 watt 9111590105
R12 10R Resistor, metal film 1/2 watt 9111590100
R13 4K7 Resistor, metal film 1/2 watt 9111590472
R14 3K9 Resistor, metal film 1/2 watt 9111590392
R15 4K7 Resistor, metal film 1/2 watt 9111590472
R16 2k2 Resistor, metal film 1/2 watt 9111590222
R17 100k Resistor, metal film 1/2 watt 9111590104
R18 6K8 Resistor, metal film 1/2 watt 9111590682
R19 50K Potentiometer Linear 2021000503
R2 100k Resistor, metal film 1/2 watt 9111590104
R20 100k Resistor, metal film 1/2 watt 9111590104
R21 120k Resistor, metal film 1/2 watt 9111590124
R22 10k Resistor, metal film 1/2 watt 9111590103
R23 10K Resistor, metal film 1/2 watt 9111590103
R24 10K Resistor, metal film 1/2 watt 9111590103
R25 50K Potentiometer Linear 2021000503
R26 50K Potentiometer Linear 2021000503
R27 50K Potentiometer Linear 2021000503
R28 50K Potentiometer Linear 2021000503
R29 22K Resistor, metal film 1/2 watt 9111590223
R3 10K Resistor, metal film 1/2 watt 9111590103
R30 22K Resistor, metal film 1/2 watt 9111590223
R31 100K Resistor, metal film 1/2 watt 9111590104
R32 1K Resistor, metal film 1/2 watt 9111590102
R33 100R Resistor, metal film 1/2 watt 9111590101
R34 6K8 Resistor, metal film 1/2 watt 9111590682
R35 6K8 Resistor, metal film 1/2 watt 9111590682
R36 10K Resistor, metal film 1/2 watt 9111590103
R37 4K7 Resistor, metal film 1/2 watt 9111590473
R38 50K Potentiometer Linear 2021000503
R39 50K Potentiometer Linear 2021000503
R4 6K8 Resistor, metal film 1/2 watt 9111590682
R40 50K Potentiometer Linear 2021000503
R41 3K3 Resistor, metal film 1/2 watt 9111590332
R42 3K3 Resistor, metal film 1/2 watt 9111590332
R43 1M Resistor, metal film 1/2 watt 9111590105
R44 1K Resistor, metal film 1/2 watt 9111590102
R45 10K Resistor, metal film 1/2 watt 9111590103
R46 10K Resistor, metal film 1/2 watt 9111590103
R47 10K Resistor, metal film 1/2 watt 9111590103
R48 10K Resistor, metal film 1/2 watt 9111590103
R49 39K Resistor, metal film 1/2 watt 9111590393
R5 50K Potentiometer Linear 2021000503
R50 1K Resistor, metal film 1/2 watt 9111590102
R51 10R Resistor, metal film 1/2 watt 9111590100
R52 1K Resistor, metal film 1/2 watt 9111590102
R53 1K Resistor, metal film 1/2 watt 9111590102
R54 10R Resistor, metal film 1/2 watt 9111590100