AUDIO TELEX IC30 Operating and installation instructions

Australian Monitor
1 Clyde Street, Silverwater NSW 2128 Australia
[phone]
www.australianmonitor.com.au
SERVICE INFORMATION
AUDIO TELEX
IC30
MIXER AMPLIFIER
CONTENTS:
OPERATION MANUAL
SCHEMATIC DIAGRAMS
BOARD OVERLAY
PARTS LISTING
TEST PROCEDURE

IC30
Circuit Description
The IC30 is a 30 watt mixer amplifier which operates on 230/240 VAC, 50Hz or 12 VDC via an external
DC power supply source. The amplifier is supplied free standing with rubber feet but can be rack mounted
via an optional rack mount kit (IC30RMK). The IC30 will deliver 30 watts into a load of 4 ohms, 70 volt or
100 volt line. The IC30 may be stacked to a maximum of four units high. An IEC type mains cord and
receptacle are provided, the receptacle also houses the mains fuse in a drawer which pulls open to expose
the fuse. A single spare fuse is also located in this drawer.
AC Power Inlet
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 operating voltage is 230/240 VAC @ 50 Hz. The inlet is equipped with an inbuilt AC fuse holder fitted
with a 1 amp plus a spare within the holder].
Power consumption is approximately 60 VA.
12 Volt DC Operation
The IC30 features optional 12VDC 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’. When running from 12 VDC power, the LED will not illuminate.
There is no trickle charge resistor across the diode.
230V/240V Slide Switch
The operating voltage of the amplifier is user selectable between 230V and 240V via a slide switch located
on the top left side of the rear panel. 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 IC30 uses two(2) Philips amplifier ICs (TDA1516) with built in current overload and thermal
protection. The two amplifier modules are capacitively coupled to the two primary windings of the output
transformer in parallel (not in bridge).
Speaker Output Terminal Strip
The screw terminals in the middle 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 or 8 ohms).
4 Positive “+” for 4 ohm speaker loads (use with common)
COM Common or “-” for 70v or100v speaker loads (maximum load of 80 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 80 Ohms

Muting
The last two(2) terminals on the barrier strip are for muting. Channels 2 and 3 are muted when the two
mute contacts are shorted together. The muting is done by a FET switch so there is no ramping. An optional
VOX muting module (TX3010) is also available with has ramping.
Phantom Power
The IC30 does not have phantom power on the XLR’s.
Tape Output
A mono RCA output connector provides a line level output with a maximum of 350mV into 10k Ohms.
Signal from all three input channels are fed to the tape output. Level adjustments made to the three input
channels will affect the level going to the tape output.
Microphone/Line Inputs
Three universal microphone/line inputs are provided. Microphone inputs are via the 3 pin XLR connectors
while line inputs are via the RCA style connectors (one of each is provided per channel). All three inputs
can be used for microphone and auxiliary input sources. It is also possible to connect both a microphone
and line/aux source to the one channel simultaneously however their relative levels to one another will be
fixed, as there is only one gain control per channel.
The XLR connectors are wired: Pin 1: Earth. Pin 2: Active (high, +), Pin 3: Active (low, -). Microphone
input sensitivity is 1.5mV at 200 ohms.
The RCA connectors have an input sensitivity of 80mV at 47K ohms.
Microphone Inputs
All three(3) inputs are dual mic/line with microphone inputs being via a 3 pin XLR connector per channel.
The mic input sensitivity is 1.5mV @ 200 ohms. Pin connections are: pin 1-earth; pin 2-signal (hot +); pin
3-signal (cold -). Phantom power is not available. Reading from left to right across the rear panel, the inputs
are 3, 2, & 1.
Line Inputs
All three(3) inputs are dual mic/line with line/auxiliary inputs being via mono RCA connectors per channel.
Line input sensitivity is 75mV @ 47K ohms. Reading from left to right across the rear panel, the inputs are
3, 2, & 1.
Optional Accessories
Tone Generators
Four separate tones are available as an optional plug in card (ATC5488). The ATC5488 is a small circuit
board which simply plugs into a socket inside the amplifier. Activation is via contact closures which may
be wired to the rear panel of the IC30 or to external switches or a timer. Full installation instructions are
provided with the tone generator.
Tones available on the ATC5488 tone generator board are:
Evacuation Tone (to Australian Standard AS2220.1.2)
Alert Tone (to Australian Standard AS2220.1.2)
Bell TonePre Announce Chime
VOX Muting Module
An optional VOX muting module (TX3010) is available. When installed inside the amplifier, signal on
channel 1 of the amplifier will automatcially mute channels 2 and 3. When there is no signal on channel 1,
channels 2 and 3 will operate normally. Full installation instructions are provided with the TX3010.

Rack Mouting Kit
An optional rack mounting kit (IC30RMK) is available to mount the IC30 in a standard 19" equipment
rack.
Fuse Sizes
Mains 230 VAC: 1 Amperes Slow Blow
The DC fuse is located on the circuit board. This is a feature of the AMIS series amplifiers, which are
equipped with a current limiting circuit preventing excessive DC currents, thus eliminating the risk of
blowing high tension fuses. In the unlikely event that the DC fuse actuates, the output IC modules should
be checked, as it is probable that the amplifier has been subjected to very extreme conditions. The DC fuses
are 4A time lag fuses.

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Title
Number RevisionSize
A3
Date: 21-Oct-2002 Sheet of
File: C:\Protel Files\CDTRAX\CD6168-1.DDB Drawn By:
R49
100R
P2
X5
R48
1M
C37
1u
C49
470u
C47
10u
C50
10u
C46
10u
C45
10u
C38
2200u
C41
2200u
V1
BD139
D6
11V
C43
100u
R35
4K7
C32
47u
C33
47u
C35
47u
C34
47u
C30
0.47
C31
0.47
C36
82P
C28
0.03
C29
1200P
R43
50K
R42
50K
R41
68K
R40
68K
R39
0R
R33
1K
R45
1K
R44
10R
R34
6K8
R31
6K8
R32
10K
R30
10K
R47
10K
IC6
LM741
2
13
3 7
12
9
5
10 11 8 6
4
1
IC4
TDA1516
2
13
3 7
12
9
5
10 11 8 6
4
1
IC5
TDA1516
N1
F1 S1
D1
C44
47u
F2
C42
470u
C40
2200u
C39
2200u
T1
D2-D5
P1
X7
T2
R38
10R
R37
1K
R36
1K
R29
10K
R28
0R
R27
47K
R26
1K
5
67
IC2B
LM1458
C27
1u
C26
1u
C25 100P
C23
1u
C22
1u
C24
1u
C14
1u
R16
100R
R17
10K
43
5
IC3C
4066
12
13
IC3A
4066
R25
47K
3
21
8 4
IC2ALM1458 C21
1u
C20
330P
C19
1u
C18
330P
C17
1u
C16
1u
C15
1u
R24
4K7
R23 22K
R22
10R
R21
22K
R20
680R
R19
680R
R18
47k
R9
47k
R10
680R
R11
680R
R12
22K
R13 22K
R14
4K7
C8
1u
C9
1u
C10
1u
C11
330P
C12
330P
C13
1u
5
67
IC1BLM1458 R15
47K
R8
47K
3
21
8 4
IC1ALM1458 C7
1u
C6
330P
C5
1u
C4
330P
C3
1u
C2
1u
C1
1u
R7
4K7
R6 22K
R5
10R
R4
22K
R3
680R
R2
680R
R1
47k
R50 10R
B
GRD
+14VDC
+5V
+5V
+10V
+10V
+5V
+5V
+10V
+10V
+5V
7
6
4
3
2
70V
4 OHM
+14VDC
+14VDC
RS 11
IC30 MIX/POWER PCB
MIC3
AUX3
MIC2
AUX2
MIC1
AUX1
240VAC
+12V
BATTERY
+12V
MUTE
+14V
TAPE OUT
PIN 14 4066 C
100V
C
CD6168-1
+10V
+5V
4A SB
1A SB

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Title
Number RevisionSize
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Date: 4-Jul-2003 Sheet of
File: C:\AMIS604 Manual\CD6168-1.DDB Drawn By:
R49
100R
P2
X5
R48
1M
C37
1u
C49
470u
C47
10u
C50
10u
C46
10u
C45
10u
C38
2200u
C41
2200u
V1
BD139
D6
11V
C43
100u
R35
4K7
C32
47u
C33
47u
C35
47u
C34
47u
C30
0.47
C31
0.47
C36
82P
C28
0.03
C29
1200P
R43
50K
R42
50K
R41
68K
R40
68K
R39
0R
R33
1K
R45
1K
R44
10R
R34
6K8
R31
6K8
R32
10K
R30
10K
R47
10K
IC6
LM741
2
13
3 7
12
9
5
10 11 8 6
4
1
IC4
TDA1516
2
13
3 7
12
9
5
10 11 8 6
4
1
IC5
TDA1516
N1
F1 S1
D1
C44
47u
F2
C42
470u
C40
2200u
C39
2200u
T1
D2-D5
P1
X7
T2
R38
10R
R37
1K
R36
1K
R29
10K
R28
0R
R27
47K
R26
1K
5
67
IC2B
LM1458
C27
1u
C26
1u
C25 100P
C23
1u
C22
1u
C24
1u
C14
1u
R16
100R
R17
10K
43
5
IC3C
4066
12
13
IC3A
4066
R25
47K
3
21
8 4
IC2ALM1458 C21
1u
C20
330P
C19
1u
C18
330P
C17
1u
C16
1u
C15
1u
R24
4K7
R23 22K
R22
10R
R21
22K
R20
680R
R19
680R
R18
47k
R9
47k
R10
680R
R11
680R
R12
22K
R13 22K
R14
4K7
C8
1u
C9
1u
C10
1u
C11
330P
C12
330P
C13
1u
5
67
IC1BLM1458 R15
47K
R8
47K
3
21
8 4
IC1ALM1458 C7
1u
C6
330P
C5
1u
C4
330P
C3
1u
C2
1u
C1
1u
R7
4K7
R6 22K
R5
10R
R4
22K
R3
680R
R2
680R
R1
47k R50 10R
D
GRD
+14VDC
+5V
+5V
+10V
+10V
+5V
+5V
+10V
+10V
+5V
7
6
4
3
2
70V
4 OHM
+14VDC
+14VDC
SBG11
IC30 MIX/POWER PCB
MIC3
AUX3
MIC2
AUX2
MIC1
AUX1
240VAC
+12V
BATTERY
+12V
MUTE
+14V
TAPE OUT
PIN 14 4066 C
100V
C
CD6168-1
+10V
+5V
4A SB
0.5A SB

IC30 Parts List
Designato
r
Part Type Description Manufacturer's Code
C1 1u Electrolytic capacitor 63V 2121280010
C10 1u Electrolytic capacitor 63V 2121280010
C11 330P Multi layer ceramic capacitor 100V 2127181331
C12 330P Multi layer ceramic capacitor 100V 2127181331
C13 1u Electrolytic capacitor 63V 2121280010
C14 1u Electrolytic capacitor 63V 2121280010
C15 1u Electrolytic capacitor 63V 2121280010
C16 1u Electrolytic capacitor 63V 2121280010
C17 1u Electrolytic capacitor 63V 2121280010
C18 330P Multi layer ceramic capacitor 100V 2127181331
C19 1u Electrolytic capacitor 63V 2121280010
C2 1u Electrolytic capacitor 63V 2121280010
C20 330P Multi layer ceramic capacitor 100V 2127181331
C21 1u Electrolytic capacitor 63V 2121280010
C22 1u Electrolytic capacitor 63V 2121280010
C23 1u Electrolytic capacitor 63V 2121280010
C24 1u Electrolytic capacitor 63V 2121280010
C25 100P Multi layer ceramic capacitor 100V 2127181101
C26 1u Electrolytic capacitor 63V 2121280010
C27 1u Electrolytic capacitor 63V 2121280010
C28 0.03 Multi layer ceramic capacitor 100V 2124292330
C29 1200P Multi layer ceramic capacitor 100V 2127181122
C3 1u Electrolytic capacitor 63V 2121280010
C30 0.47 Metalised Poly Capacitor 2124262472
C31 0.47 Electrolytic capacitor 63V 2124262472
C32 47u Electrolytic capacitor 35V 2121230470
C33 47u Electrolytic capacitor 35V 2121230470
C34 47u Electrolytic capacitor 35V 2121230470
C35 47u Electrolytic capacitor 35V 2121230470
C36 82P Multi layer ceramic capacitor 100V 2127181820
C37 1u Electrolytic capacitor 63V 2121280010
C38 2200u Electrolytic capacitor 35V 2121220222
C39 2200u Electrolytic capacitor 35V 2121220222
C4 330P Multi layer ceramic capacitor 100V 2127181331
C40 2200u Electrolytic capacitor 35V 2121220222
C41 2200u Electrolytic capacitor 35V 2121220222
C42 470u Electrolytic capacitor 35V 2121230471
C43 100u Electrolytic capacitor 100V 2121220101
C44 47u Electrolytic capacitor 35V 2121230470
C45 10u Electrolytic capacitor 50V 2121250100
C46 10u Electrolytic capacitor 50V 2121250100
C47 10u Electrolytic capacitor 50V 2121250100
C49 470u Electrolytic capacitor 35V 2121230471
C5 1u Electrolytic capacitor 63V 2121280010
C50 10u Electrolytic capacitor 50V 2121250100
C6 330P Multi layer ceramic capacitor 100V 2127181331
C7 1u Electrolytic capacitor 63V 2121280010
C8 1u Electrolytic capacitor 63V 2121280010
C9 1u Electrolytic capacitor 63V 2121280010
D1 Diode 1N5408 2133450408
D2-D5 Diode 1N5408 2133450408
D6 12V Zener Diode 1W 12V 1N4742 2136010120
F1 .5A 0.5 Amp Anti-surge Fuse 2543210059

F2 4.0A 4.0 Amp Anti-surge Fuse 2541210840
IC1 LM1458 IC Dual Op Amp DIP8 2152870558
IC2 LM1458 IC Dual Op Amp DIP8 2152870558
IC3 4066 I.C. CD 4066BCN VCA (14 PIN) 2159440066
IC4 TDA1516 Amplifier IC TDA1516BQ 2153121516
IC5 TDA1516 Amplifier IC TDA1516BQ 2153121516
IC6 LM741 LM741 IC 2152080741
P1 X7 Transistor BD139 2141400139
P2 X5 Transistor BD139 2141400139
R1 47k Resistor, metalfilm .5W 9111590473
R10 680R Resistor, metalfilm .5W 9111590681
R11 680R Resistor, metalfilm .5W 9111590681
R12 22K Resistor, metalfilm .5W 9111590223
R13 22K Resistor, metalfilm .5W 9111590223
R14 4K7 Resistor, metalfilm .5W 9111590472
R15 50K Potentiometer linear 2021000503
R16 100R Resistor, metalfilm .5W 9111590101
R17 10K Resistor, metalfilm .5W 9111590103
R18 47k Resistor, metalfilm .5W 9111590473
R19 680R Resistor, metalfilm .5W 9111590681
R2 680R Resistor, metalfilm .5W 9111590681
R20 680R Resistor, metalfilm .5W 9111590681
R21 22K Resistor, metalfilm .5W 9111590223
R22 10R Resistor, metalfilm .5W 9111590100
R23 22K Resistor, metalfilm .5W 9111590223
R24 4K7 Resistor, metalfilm .5W 9111590472
R25 50K Potentiometer linear 2021000503
R26 1K Resistor, metalfilm .5W 9111590102
R27 47K Resistor, metalfilm .5W 9111590473
R28 0R Resistor, metalfilm .5W 9111590000
R29 10K Resistor, metalfilm .5W 9111590103
R3 680R Resistor, metalfilm .5W 9111590681
R30 10K Resistor, metalfilm .5W 9111590103
R31 6K8 Resistor, metalfilm .5W 9111590682
R32 10K Resistor, metalfilm .5W 9111590103
R33 1K Resistor, metalfilm .5W 9111590102
R34 6K8 Resistor, metalfilm .5W 9111590682
R35 4K7 Resistor, metalfilm .5W 9111590472
R36 1K Resistor, metalfilm .5W 9111590102
R37 1K Resistor, metalfilm .5W 9111590102
R38 10R Resistor, metalfilm .5W 9111590100
R39 0R Resistor, metalfilm .5W 9111590000
R4 22K Resistor, metalfilm .5W 9111590223
R40 68K Resistor, metalfilm .5W 9111590683
R41 68K Resistor, metalfilm .5W 9111590683
R42 50K Potentiometer linear 2021000503
R43 50K Resistor, metalfilm .5W 2021000503
R44 10R Resistor, metalfilm .5W 9111590100
R45 1K Resistor, metalfilm .5W 9111590102
R47 10K Resistor, metalfilm .5W 9111590103
R48 1M Resistor, metalfilm .5W 9111590104
R49 100R Resistor, metalfilm .5W 9111590101
R5 10R Resistor, metalfilm .5W 9111590100
R50 10R Resistor, metalfilm .5W 9111590100
R6 22K Resistor, metalfilm .5W 9111590223

R7 4K7 Resistor, metalfilm .5W 9111590472
R8 50K Potentiometer linear 2021000503
R9 47k Resistor, metalfilm .5W 9111590473
S1 Rocker switch SPST 2511213112

WORK INSTRUCTION
Testing of IC 30
1. Perform physical inspection ( Visual Inspection stage )
1.1 Check :
•All screws for tightness ( esp. H/S & IC fixing).
•Capacitors for polarity.
•Earth connection for good contact (XLR gnd to AC earth), including earthing of
RCA’s,
•All wiring points for good contacts (Soldering and Crimping)
2. Set up amplifier for test (Pre (PCB testing) ).
2.1 Connect amplifier to :
•Variac (0 Vac)
•Signal generator (Mic 1, no signal),
•Resistive load (4ohm on 4ohm output).
2.2 Reset controls :
•Volume controls to minimum,
•Bass/treble control to center,
•Phantom power switch to off,
3. Power up (Pre (PCB testing).
3.1 Turn on power switch and adjust voltage to 120VAC. Watch current meter for
excess current draw.
3.2 Check DC power supply at fuse. Should be approximately. 7V ( + 1V )
3.3 Check DC voltage on mixer board. Should be approximately. 6V (Check on 8 No.
Pin of 1458).
3.4 Adjust variac to 240VAC. Check DC power supply. Should be approx. 15V
(+ 1V) loaded, no load (16.5V + 1V).
3.5 Check DC voltage on mixer board. Should be approx. (11V + 1V).
4. AC Check (Final stage).
4.1 Set signal generator to (1mV) + 0.2mV. Turn up Mic1 volume control to full.
Watch for irregularities with output. Check sensitivity of input. – MIC 1mV
(+ 0.2mV) in 10.5Vrms out (2.6% THD).
4.2 Measure 100V line, 70V line, tol. 5%
4.3 Check tape output (0.4V + 100mV).
4.4 Check Bass control @100HZ = + 12dB (can get only upto 8V O/P with total swing
of (20 – 24dB) ) and treble @10KHz = + 10dB (tolerance. 10%) total swing (18 –
22dB).

5. Function Checks (Final stage).
5.1 Move signal generator to Mic2. Turn up volume control. Watch for irregularities.
Check for 10.5V out.
5.2 Move signal generator to Mic3. Turn up volume control. Watch for irregularities.
Check for 10.5V out.
6. Line level inputs (Final stage).
6.1 Connect signal generator to Line1 input. Check input sensitivity – LINE (85mV +
20mV) in 10.5V out.
6.2 Move signal generator to Line2 input. Check 10.5V out.
6.3 Move signal generator to Line3 input. Check 10.5V out.
6.4 Check muting function by shorting mute terminals on rear barrier strip.
6.5 Check operation of (230 – 240)V selector switch for full wattage in each position
of switch.
6.6 Frequency Response – Check the frequency response and power bandwidth of 1st
set of every new batch of production.
Frequency Response – (250Hz – 10kHz).
Power band – (250Hz – 6.5kHz).
7. Finishing up (Final stage).
7.1 Short output and check that signal cuts out and returns after short is removed.
7.2 Remove input signal and check for Hum and Noise (<20m Vrms)
7.3 Connect 12V DC to rear barrier strip, turn off power switch. Check signal remains.
7.4 Reset volumes to minimum.
7.5 Disconnect from test bench and inspect for scratches on external paint.
8. Burn In.
8.1 Leave units on (with lid) for 24 hrs.
9. Sound Test (Check Fuse Ratings).
9.1 Adjust tone controls to minimum. and maximum listening for scratches and
irregularities. Similarly for each level control with MASTER full.
9.2 Connect CD player to Line4 and bring up channel and master volumes.
9.3 Listen for irregularities.
9.4 Check priority of (MIC1 and MIC2) over all other channels.
9.5 Check all the tones.

WORK INSTRUCTION
Testing of IC 30
1. Perform physical inspection ( Visual Inspection stage )
1.1 Check :
•All screws for tightness ( esp. H/S & IC fixing).
•Capacitors for polarity.
•Earth connection for good contact (XLR gnd to AC earth), including earthing of
RCA’s,
•All wiring points for good contacts (Soldering and Crimping)
2. Set up amplifier for test (Pre (PCB testing) ).
2.1 Connect amplifier to :
•Variac (0 Vac)
•Signal generator (Mic 1, no signal),
•Resistive load (4ohm on 4ohm output).
2.2 Reset controls :
•Volume controls to minimum,
•Bass/treble control to center,
•Phantom power switch to off,
3. Power up (Pre (PCB testing).
3.1 Turn on power switch and adjust voltage to 230VAC. Watch current meter for
excess current draw.
3.2 Check DC power supply at fuse. Should be approximately. 7V ( + 1V )
3.3 Check DC voltage on mixer board. Should be approximately. 6V (Check on 8 No.
Pin of 1458).
3.4 Adjust variac to 240VAC. Check DC power supply. Should be approx. 15V
(+ 1V) loaded, no load (16.5V + 1V).
3.5 Check DC voltage on mixer board. Should be approx. (11V + 1V).
4. AC Check (Final stage).
4.1 Set signal generator to (1mV) + 0.2mV. Turn up Mic1 volume control to full.
Watch for irregularities with output. Check sensitivity of input. – MIC 1mV
(+ 0.2mV) in 10.5Vrms out (2.6% THD).
4.2 Measure 100V line, 70V line, tol. 5%
4.3 Check tape output (0.4V + 100mV).
4.4 Check Bass control @100HZ = + 12dB (can get only upto 8V O/P with total swing
of (20 – 24dB) ) and treble @10KHz = + 10dB (tolerance. 10%) total swing (18 –
22dB).

5. Function Checks (Final stage).
5.1 Move signal generator to Mic2. Turn up volume control. Watch for irregularities.
Check for 10.5V out.
5.2 Move signal generator to Mic3. Turn up volume control. Watch for irregularities.
Check for 10.5V out.
6. Line level inputs (Final stage).
6.1 Connect signal generator to Line1 input. Check input sensitivity – LINE (85mV +
20mV) in 10.5V out.
6.2 Move signal generator to Line2 input. Check 10.5V out.
6.3 Move signal generator to Line3 input. Check 10.5V out.
6.4 Check muting function by shorting mute terminals on rear barrier strip.
6.5 Check operation of (230 – 240)V selector switch for full wattage in each position
of switch.
6.6 Frequency Response – Check the frequency response and power bandwidth of 1st
set of every new batch of production.
Frequency Response – (250Hz – 10kHz).
Power band – (250Hz – 6.5kHz).
7. Finishing up (Final stage).
7.1 Short output and check that signal cuts out and returns after short is removed.
7.2 Remove input signal and check for Hum and Noise (<20m Vrms)
7.3 Connect 12V DC to rear barrier strip, turn off power switch. Check signal remains.
7.4 Reset volumes to minimum.
7.5 Disconnect from test bench and inspect for scratches on external paint.
8. Burn In.
8.1 Leave units on (with lid) for 24 hrs.
9. Sound Test (Check Fuse Ratings).
9.1 Adjust tone controls to minimum. and maximum listening for scratches and
irregularities. Similarly for each level control with MASTER full.
9.2 Connect CD player to Line4 and bring up channel and master volumes.
9.3 Listen for irregularities.
9.4 Check priority of (MIC1 and MIC2) over all other channels.
9.5 Check all the tones.