Infinite 4/5/6 V2
Service Manual
Written By Rog Mogale
Infinite 4/5/6 V2
Controls
6
3
1
4
12 13
7
10
14
1 2
oo
Power
Infinite X6
0
1
ON -18 -6 0 L P
oo
0
2
Front Panel
1.Power Switch
Used to turn the amplifier on or off.
2.Standby LED
Indicates that the amplifier is connected to the mains but has not been switched
on.
3.Level Controls
Used to control CH 1 & 2's output levels.
4.Power LED's
The Power LED's indicate that each channel is active.
5.Signal LED's
When illuminated the LEDs indicate an audio signal is present at the channel's
output.
6.'CEP' LED's (L)
The CEP LED's indicate the Clip Elimination circuit is active. The CEP circuit
works by examining the audio output signal, it then regulates many circuits
within the amplifier to reduce clipping at the output. Note that the CEP circuit
can only prevent a clipped waveform from be generated within the amplifier
itself, it cannot remove a clipped waveform that has been produced from a
component earlier in the chain.
7.Protect LED's (P)
The protect LED's light up when the amplifier detects speaker over excursion,
dangerous subsonic frequencies, DC or thermal overload. Note the protect LED's
also indicate the soft start circuit is active, so will illuminate during power on.
See page 8 for more details about the VSP protection circuit.
5 8
2
9
11
15
Rear Panel
1.Input XLR's
The input impedance of the balanced XLR's is 20Kohms. Pin 2 is signal +
2.Output XLR's
Linked outputs from the inputs.
3.Bridge Mode Switch
Selects Bridge Mode. A red LED will illuminate when the amplifier is operating
in bridge mode. Use input 1 in bridge mode. See page 8 for more details.
4.25Hz Hi Pass Filter Switches
Turns each channels 25Hz 18 dB/oct butterworth Hi Pass filter on or off.
For maximum protection leave both filters on (pressed in position).
5.Parallel Mode Switch
Links input 1 with input 2. See page 8 for more details.
6.Limiter Switches
Turns each channels limiter on or off. For maximum protection leave in the
on position (pressed in).
7.Filter Select Switches
Independent channel selection of Hi Pass, Lo Pass or bypassed filters.
8.Crossover Frequency Switch
Selects the crossover frequency point between the Lo and Hi Pass filters.
9.Crossover outputs
Jack outputs for both Hi and Lo pass filters. See page 8 for more details.
10.CH1 Speakon Outputs
In stereo/parallel mode use +1 and -1. In bridge mode use +1 and +2.
CH2 output is on pins +2 and -2.
11.CH2 Speakon Outputs
In stereo/parallel mode use 1+ and 1-. Pins +2 and -2 are not used.
12.Ground Switch
Ground is connected when pressed in and lifted when pressed out.
13.Output Binding Posts
Accepts both 4 mm plugs or bare wire. Use CH1 + and CH 2 + for bridge out.
14.Fuse
Replaceable fuse for amplifier protection.
15.Power Cable
AC power in 230 VAC 50Hz. Fitted with UK 3 pin fused mains plug.
(16 Amp CEE Form on Infinite 6)
page 1
Infinite 4/5/6 V2
TECHNICAL SPECIFICATIONS
FREQUENCY RESPONSE ref.100W@8W
THD ref. 4W, 1KHz
S/N 20Hz-20kHz, ref full output
INPUT SENSITIVITY
INPUT IMPEDANCE
CROSSTALK
CMRR ref. 1KHz
SLEW RATE
DAMPING FACTOR 1kHz and Below
CONNECTORS
COOLING
AMPLIFIER PROTECTION
VOLTAGE RANGE
RMS Output Power per ch
Mode
Stereo
(Both CH Driven)
Bridge Mode
Voltage Gain (8 W)
Maximum Current Draw
0.1%THD+N 0.1%THD+N 0.1%THD+N
Impedance
1kHz
680
4
8
440 434 540 535
4
1680
8
1360 1344 1780
both ch - 2 ohms 9.5 Amps
For Infinite models 4 - 6 v2
20Hz - 20kHz +0.04 dB / -0.06 dB
Infinite 4 - 5 0.01% - Infinite 6 0.02%
106 dB
1.4 Vrms
20kW balanced
>95dB
>90dB
Infinite 4 - 5 60V/us - Infinite 6 55V/us
Infinite 4 - 5 >680 - Infinite 6 >700
Input: balanced XLR Output: Speakon + Binding posts
2 Variable speed fans
Full short circuit, open circuit, thermal, ultrasonic, and
RF protection, stable into reactive or mismatched loads
230 VAC 50Hz +/- 10%
Infinite 4
10Hz-20kHz
672
1670
42x (36dB) 48x (37dB) 60x (38.5dB)
Infinite 5
RMS Output Power per ch
0.1%THD+N
1kHz
890 882
2190 2179
both ch - 2 ohms 12.3 Amps
10Hz-20kHz
1764
Infinite 6
RMS Output Power per ch
0.1%THD+N 0.1%THD+N
1kHz
1200 1190
740 733
2700 2687
2400
both ch - 2 ohms 15.6 Amps
10Hz-20kHz
2380
Infinite 4 to 6 V2 amplifiers are only stable into 2 ohm loads per channel when driving midtop
speakers, i.e. from 100Hz upwards. The minimum impedance for bass use must be 4 ohms
per channel, i.e. two 8 ohm speakers in parallel from each amplifier channel.
Dimensions :
48.3 cm (19") wide, 8.9 cm (3.5") high and 46.2 cm (18.2") deep.
Weight:
Infinite 4 :
20.2 Kg (44.5 pounds) net.
24.0 Kg (52.9 pounds) shipping weight.
Infinite 5 :
22.0 Kg (48.5 pounds) net.
25.8 Kg (56.9 pounds) shipping weight.
Infinite 6 :
24.0 Kg (52.9 pounds) net.
27.8 Kg (61.3 pounds) shipping weight.
Notes
Specifications
Bridge Mode
When driving bass speakers the minimum load in bridge mode must be 8 ohms.
Connect to input 1 only and use the two CH1 speakon outputs or both + binding posts.
Use +1 for signal + and +2 for signal - Minimum impedance in bridge mode must be 8
ohms for bass use or 4 ohms for midtop use. The amplifier is mono when running in
bridge mode and both CH1 speakons output the same signal. When using the binding
posts for bridge mode, CH 1 + terminal is signal + and CH2 + terminal is signal -
Parallel Switch
Input 1 is linked to input 2. Connect to input 1 or input 2, the same signal will output
from both CH1 and CH2 outputs. Each channels level is set with its own level control.
Note that parallel operation on Infinite amplifiers is not like the parallel mode on some
amplifiers that allow you to drive into very low impedances. Parallel mode on Infinite
series amplifiers makes both inputs receive the same signal.
VSP Velocity Sense Protection
All version 2 Infinite amplifiers are equipped with velocity sensing protection.
The VSP circuit monitors back EMF and will attenuate the output for a very brief period
if the amplifier detects over excursion or potential damage to a speaker.
If very severe overload conditions are detected and speaker failure is imminent, the
amplifier will mute its output for a brief period. Reducing the amplifiers output level will
stop the protection circuit from muting the output in this situation.
Please note that the VSP circuit can only assist with protecting your speakers.
It in no way guarantees complete protection against any component failure and safe
working practices should always be followed with regard to matching amplifier output
levels to speaker input ratings.
Onboard Filter Network
The onboard filter network allows both Hi and Lo pass filters to be set on individual
channels. A typical arrangement might be to set a Lo pass filter on channel 1 and use it
to drive bass speakers and to set a Hi pass filter on channel 2 and use it to drive
midtop speakers. The frequency select switch would be used to set the crossover
frequency in this case. The crossover frequency can be 90Hz, 120Hz or 160Hz.
Both Hi and Lo sections of the crossover are also output from the 4 rear panel jack
sockets, permitting the onboard crossover to feed other amplifiers in the system. The Hi
outputs are from the Hi Pass section and the Lo outputs are from Lo Pass section. This
allows for the amplifier with the crossover to drive bass speakers and other amplifiers
to drive midtop speakers, or vice versa. Note that the crossover outs, output both Lo
page 2
Infinite 4/5/6 V2
FAN
-
TO
INPUT
Ch1
AC45V
AC90V
0V
HV
LV
SIG IN
LIM -
LIM+
PRO
GND
28V
AC 20V
Ch1 LIMI
Ch1 Vol
SIG IN
LIM -
LIM+
PRO
GND
28V
POWER SW
Ch2 LIMi
Ch2 Vol
AC45V
0V
AC45V
AC90V
AC45V
LV
0V
HV
LV
LV
15V
+ 15V
GND
POWER SW
AC IN (L)
AC IN (N)
AC OUT
FROM
INPUT
TO CON
15V
GND
-15V
TO
Ch1 AMP
Ch1 LIM Ch2 LIM
15V
GND
-15V
Ch2 AMP
CH1VOL
Ch2 VOL
Ch1 FAN
TO CON
TO
+ +
-
Ch1 OUT
Ch2 OUT
240V~ IN
LN
FUSE
Cable Layout
page 3
FAN
TO
INPUT
15V
Ch2
+ 15V
GND
FROM
INPUT
TO CON
Ch2 FAN
Infinite 4/5/6 V2
INPUT_CH1
INPUT_CH2
LO_OUT
Hi_OUT
LIMI_CH1
PARALLEL
LO_OUT
Hi_OUT
LIMI_CH2
J15
1
2
3
4
5
J16
1
2
3
4
5
2
1
JP1
XLR_3-P
2
3
1
JR1
XLR_3-R
0
2
3
1
0
J19
1
2
3
4
5
J20
1
2
3
4
5
2
1
JP2
XLR_3-P
2
3
1
JR2
XLR_3-R
0
2
3
1
0
COM
0 0
SW4
0
0
C58
1 2
100n-250V
R132
10k
R137
10k
R172
10k
R177
10k
0
21
U105D
12
13
21
21
U205D
12
13
21 21
GROUNDING
OFF
ON
R112
470R
R117
470R
2 1
2 1
C31 100P
1 2
R133 10k
+15V
+
-
-15V
R138 10k
C33 100P
1 2
2 1
2 1
1 2
+15V
+
-
-15V
1 2
SW8
OUT
R152
470R
R157
470R
C45
100P
R173
10k
OUT
R178
0
1
C47
100P
21
21
00
21
MC33079/MC
21
21
MC33079/MC
k
C26
1 2
22uF-16V
R113
100k
C27
1 2
22uF-16V
R119
100k
14
21
21
14
LIMITER_ON (CH1)
SW2
0
R135
21
R136
21
10k
+15V
U105C
C36
C35
1 2
1 2
180n
C40
1 2
22uF-16V
R153
100k
0
C41
1 2
22uF-16V
R159
100k
0
OFF
ON
0
C49
1 2
180n
180n
LIMITER_ON (CH1)
C50
1 2
180n
10
+
8
OUT
9
ÂMC33079/MC
R143
21
-15V
90.9k
0
SW6
R176
21
10k
+15V
U205C
10
+
8
OUT
9
ÂMC33079/MC
R183
21
-15V
90.9k
0
25HZ HIPASS
SW3
OFF
R144
2 1
ON
620k
0
25HZ HIPASS
SW7
OFF
R184
2 1
ON
620k
0
3.6k
R139
21
3.6k
+15V
U105B
R140
5
21
+
10k
OUT
6
ÂMC33079/MC
-15V
C39
1 2
100P
R147
10k
R149
2.4k
R151
R150
21
10k
15k
R175
3.6k
R179
3.6k
+15V
U205B
R180
5
21
+
10k
OUT
6
ÂMC33079/MC
-15V
C57
1 2
100P
R187
10k
R188
2.4k
R190
R189
21
10k
15k
R141
21
7
20k
21
21
21
21
21
R181
21
7
20k
21
21
21
R114 120k
21
R115 39k
21
R116 20k
21
R118 120k
21
R120 39k
21
R121 20k
21
R123 120k
21
R124 39k
21
R127 20k
21
R129 120k
21
R130 39k
21
R134 20k
21
C32
1 2
100n
U106C
-15V
MC33079/MC
9
-
8
OUT
10
+
+15V
0
R154 120k
21
R155 39k
21
R156 20k
21
R158 120k
21
R160 39k
21
R161 20k
21
R163 120k
21
R164 39k
21
R167 20k
21
R169 120k
21
R170 39k
21
R174 20k
21
C46
1 2
100n
-15V
U206C
MC33079/MC
9
-
8
OUT
10
+
+15V
0
XOVER CH1
+15V
U105A
3
+
1
90Hz/120Hz/160Hz
C34
1 2
100n
U106A
R142
20k
R182
20k
-15V
0
0
2
-
3
+
XOVER CH2
90Hz/120Hz/160Hz
1 2
2
-
3
+
MC33079/MC
R145
1
OUT
+15V
C48
100n
U206A
-15V
MC33079/MC
OUT
+15V
21
20k
R185
1
21
20k
21
21
C37
1 2
100n
U106B
-15V
MC33079/MC
6
-
5
+
+15V
0
1 2
-15V
6
-
5
+
+15V
0
OUT
C51
100n
MC33079/MC
OUT
R146
7
20k
U206B
R186
7
20k
C38
1 2
100n
-15V
13
21
-
12
+
+15V
0
C52
1 2 1 2
100n
-15V
13
21
-
12
+
+15V
0
1 2
OUT
1 2
U206D
MC33079/MC
OUT
BYPASS
C30
22uF-16V
U106D
14
C44
22uF-16V
14
BYPASS
MC33079/MC
LO PASS
HI PASS
LO PASS
HI PASS
FILTER TYPE1
SW ROTARY 2P-3W
FILTER TYPE2
SW ROTARY 2P-3W
21
21
-15V +15V
C53
1 2
100n
C55
100uF-25V
D64
D1N4007
J23
POWER_IN (CH1)
OUT
2
R126
ÂMC33079/MC
20k
-15V
0
R166
20k
0
0 0
D65
D1N4007
123
21
+15V
U205A
3
+
1
OUT
2
ÂMC33079/MC
-15V
21
D1N4007
Input Board
& Crossover
Schematics
J17
VOL_CH1
123
0 0
R125
C29
21
1 2
10k
22uF-16V
R128
21
R131
100k
0
R171
100k
0
D66
J24
POWER_IN (CH2)
C54 100n
123
J21
VOL_CH2
123
100uF-25V
D67
D1N4007
+15V
0
C56
10k
0
-15V
NJM5532D
6
-
OUT
5
+
+15V
0
R148
21
8.2k
D63
1 2
BRIDGED_LED
C43
22uF-16V
-15V
SW5
R165
21
10k
R168
21
10k
0
0
J18
OUTPUT_CH1
1
C28
1 2
27P
R122
21
10k
-15V
U107A
NJM5532D
2
-
1
OUT
3
+
+15V
U107B
7
BRIDGED
C42
1 2
27P
R162
21
10k
-15V
U207A
NJM5532D
2
-
1
OUT
3
+
+15V
-15V
U207B
NJM5532D
6
-
7
OUT
5
+
+15V
2
J22
OUTPUT_CH2
1
2
0
page 4
R75
21
D37
P2
6 21
5
4
3
2
1
J9
CON6
P2
R92
21
D47
P2
6
5
4
3
2
1
J12
CON6
P2
J7
CON2
Infinite 7/8 V2
1
+24V
R76
21
Q30
D45
D1N4148
Q2N5551
22k
D38
LED
R85
100k
R86
21
21
100R
R90
21
20k
22k
LED
R83
100k
R84
21
100R
R89
21
100k
Q31
D43
D1N4148
21
R77
D39
Q2N5551
R78
22k
LED
R87
100k
R88
21
100R
R91
21
5.6k
21
22k
D40
LED
Q32
21
Q2N5551
D44
D1N4148
R79
21
100R
D41
LED
D42
LED
D36
D1N4148
R81
1k
P2 P2 P2
+24V
Q34
D53
D1N4148
21
R94
D49
Q2N5551
22k
LED
R104
100k
R105
2121
21
100R
R108
21
5.6k
R93
22k
LED
R100
100k
R101
21
100R
R106
21
100k
21
22k
D48
LED
Q33
D55
D1N4148
Q2N5551
R102
100k
21
R103
21
100R
R107
21
20k
P2
Q35
D54
21
D1N4148
R95
D50
Q2N5551
P2P2
R96
22k
LED
21
100R
D51
LED
D52
LED
D46
D1N4148
R98
1k
2
Control Schematics
2
U3
21
J10
CON2
21
1
4N25A
1
2
2
U4
1
4N25A
3
4
3
4
R80
21
10k
R82
B10K
R97
21
10k
R99
B10K
J8
1
2
3
CON3
J11
1
2
3
CON3
2
1
J14
AC22V
page 5
D59
D1N4007
D61
D1N4007
D60
D62
D1N4007
D1N4007
C24
1000uF-35V
P2
R109
21
R111
100k-1W
100k-1W
21
+24V
C25
1 2
100n-250V
J13
POWER ON
2
1
SW1
SW KEY-Y2011
R110
100k-1W
21
D56
D1N4007
Standby LED
D57
LED
D58
3V9-0.5W
C23
4.7uF-50V
Infinite 4/5/6 V2
Output Schematics
R1
U2
7824
21
21
R69
220k
IN1OUT
GND
3
R45
51R-3W
+15V
-15V
21
D28
D1N4007
C21
22uF-50V
10k
R14
10k
D1N4007
21
21
21
FB
2
D24
R56
430R-3W
Q25
RT2
PTC55
0
J1
1
2
3
CON3
J2
1
2
3
CON3
0
J3
1
2
3
4
5
6
CON6
R38
51R-3W
t
J4
2
1
CON2
J5
2
1
C16
CON2
J6
CON4
47uF-50V
4
3
0
2
1
P6KE27A
C20
D32
47uF-50V
R5
3
2
D1N4007
D33
D1N4007
1k
1 2
+
-
21
Q2N5401
D29
C1
100P
R2
10k
R15
10k
1 2
430R-3W
R70
100k
D1N4007
D34
C8
100P
R57
21
U1A
OUT
NE5532P
21
21
D1N4007
R37
10R-3W
M4
1
+HV1
M1
1
+LV
M2
FB
1
FB
M5
1
OUTPUT+
M6
1
OUTPUT+
M7
1
-LV
M8
1
-HV
+HV
R3
220R
C3
150P-1KV
1 2
R44
3V3-0.5W
1 2
Q2
D3
R34
12R-0.5W
12R-0.5W
D26
1 2
R73
220R
P1
R24
22R-1W
21
12
21
21
21
3.3k-3W
21
P1
21
3.3k-3W
Q2SC2383
R13
3K3-3W
22R-1W
R66
3K3-3W
Q29
R4
220R
R18
R48
R58
Q2SC4793
2 1
FB
Q14
Q2SC5200
21
Q3
21
Q2SA1943
21
FB
Q27
Q2SA1837
Q5
Q2SC5200
Q16
Q2SC5200
Q23
Q2SA1943
21
21
Q11
Q2SA1943
21
21
Q6
Q2SC5200
R20
0.1R
R27
0.22R
Q17
Q2SC5200
R51
0.22R
R60
Q24
0.1R
Q2SA1943
F1
F2
21
21
Q2SA1943
21
21
15A
Q12
15A
R61
0.1R
R21
0.1R
R28
0.22R
R52
0.22R
C17 100n-250V
Q18
Q2SC5200
1 2
C7
100n-250V
1 2
21
Q13
Q2SA1943
21
2
1
3
D5
MUR3030PT
R29
0.22R
R53
0.22R
D23 MUR3030PT
R62 2.7R-3W
R17 2.7R-3W
3
1
D1N5408
P1
P1
D20
D1N5408
2
21
212 1
1
M3
L1
GND
1uH
1
M4
1 2
GND
D22
D1N4007
R36
21
21
10R-3W
R41
5R6-3W
2 1
C15
100n-250V
1 2
P1
LS1
2
1
4
3
5
953-1A-24DG-2
Q4
Q2SC5200
R19
21
D4
0.1R
FR157
R25
R26
21
0.22R
0.22R
Q9
Q10
Q2SA1943
Q15
Q2SC5200
R49
R50
21
0.22R
0.22R
R59
21
D27
FR157
Q22
0.1R
Q2SA1943
0
21
R6
C2
0
1
15K
47uF
21
R11
150R
R30
C13
NC
R39
2K2
0
1 2
R40
21
21
100K
000
21
D30
220uF25V
Q21
Q2N5551
R65
21
3.3k
R68
21
Q26
100k
C22
1 2
Q2N5401
D31
R71
21
1.5k
D1N4007
LED
21
R7
R8
3.9k-3W
3.9k-3W
2 1
D1
D1N4007
C9
1000uF35V
+15V
D8
U1B
D1N4744A
NE5532P
5
+
7
21
R63
100k
D35
OUT
6
-
D16
D1N4744A
-15V
C14
1000uF35V
D21
D1N4007
D25
7V5-0.5W
21
21
R64
t
10k-1W
C5 120n
1 2
D6
D1N4007
12
C11
2.2n
P1
D17
D1N4007
R47 3.9k-3W
2 1
R54 3.9k-3W
R55
10k-3W
RT3
NTC95
R22
R23
21
21
R9 33k-1W
C4 47P-1KV
1 2
R12 68k
R16 1k
1.8k-3W
1.8k-3W
D14
D1N4007
2 1
R46 1k
+HV
21
21
D11
D1N4007
21
21
D2
4.7V-0.5W
21
FB
P1
D18
4.7V-0.5W
R35
D12
D15
D1N4007
D1N4007
100R
1.5n-1KV
1 2
FB
R10
22k-3W
D7
SF14
C10
D9
SF14
R31
100R
RT1
NTC500
Q2SC4793
C12
D13
FR157
33n
1 2
t
R32
2.2k
R42
2.2k
D19
FR157
Q2SA1837
R67
22k-3W
21
Q1
Q2SA1013
Q2SA1013
21
C6
470P-1KV
3V3-0.5W
FB
Q7
Q8 D10
Q2SC4793
21
R33
21
12R-0.5W
21
21
R43
12R-0.5W
Q20
Q19
Q2SA1837
FB
P1
C18
21
470P-1KV
C19 150P-1KV
Q28
Q2SC2383
R72
21
220R
page 6
M9
HV(AC)
R74
1
21
3R3
0 P1
AC_240V1
AC_0V1
T1
T1 TRAN_FBP1S4/SM
T1
T2
10
1
1
1 1
2
9
3
8
4
7
5
6
2
9
3
8
4
7
5
6
4
7
P1
1
ACH2
P2
1
ACL1
P3
1
COM1
P4
1
ACL3
P5
1
ACH4
P6
1
ACH6
P7
1
ACL5
P8
1
COM4
P9
1
ACL7
P10
1
ACH8
J25
1
2
AC_22V
ACH1
ACH3
ACL2
COM2
ACL4
ACH5
ACH7
ACL6
COM5
ACL8
ACH9
ACH10
1
T2
1
T3
1
T4
1
T5
1
T6
1
T7
1
T8
1
T9
1
T10
1
T11
1
T12
1
- +
- +
D68
KBPC3510S
D70
KBPC3510S
D69
KBPC3510S
- +
D71
KBPC3510S
- +
C59
10000uF-80V
C60
10000uF-80V
C61
10000uF-80V
C62
10000uF-80V
C63
10000uF-80V
C64
10000uF-80V
C65
10000uF-80V
C66
10000uF-80V
Infinite 4/5/6 V2
T13
1
+HV2
T14
1
+LV1
T15
1
COM3
T16
-LV1
T18
1
-HV1
T19
1
+HV3
T20
1
+LV2
T21
1
COM6
T22
1
-LV2
T23
1
-HV2
PSU Schematics
page 7
AC_IN(240V)1
AC_0V(BKL)1
5.1R-1W
T24
POWER ON
BTA41-600
X1
D72
KPB210
21
470k-1W
470k-1W
R192
1k-0.5W
R193
R194
- +
21
1 2
21
21
R191
2
J26
1
1
T26
C67
680n-275VAC
470uF-35V
NTC_2R1
NTC_2R2
R
T
4
1
2
C68
R
T
5
LS2
953-1A-24DG-2
3
C69
470uF-35V
AC_OUT(240V)1
11
T25
Infinite 4/5/6 V2
Control PCB
22K
22K
22K
22K
22K
22K
100K
100
100K
LED3
LED2
100K
100
100K
2U_CON.PCB
1N4148
LED5
LED4
1N4148
1N4148
1N4148
LED7
LED6
2N5551
1N4148
100K
100
20K
2N5551
2N5551
2N5551
LED9
LED11
LED10
LED8
2N5551
20K
100
100K
2N5551
1N4148
100K
100
5K6
LED13
22K
22K
LED12
100
5K6
100
100K
1
100
1
35V1000U
250V104
1
1K
1N4148
+
1N4007
1N4007
1N4007
1N4007
LED1
POWER
50V4U7
3V9
1N4007
1W100K
1W100K
1W100K
1
POWER
1K
1N4148
B10K
1
VR1
10K
LCR0202
OPTOIS
1
OPTOIS
1
VR2
B10K
10K
LCR0202
1
page 8
Front View
Infinite 4/5/6 V2
Input PCB 1
BRIDGED
47U-16V
CH2
LOW_CUT
184-63V
1
VR2
1
1
1
1
1
1
1
-15V_A+15V_A
LIMI_CH2 LIMI_CH1
104-250V
CH2
VR1
CH2
CH1
100U-25V
-15V_B +15V_B
POWER
++
LIMITER_ON
100U-25V
CONNECT
100n
CONNECT
47U/16V
47U/16V
GND
CH1
LIMITER_ON
GROUNDING
47U/16V
184-63V
CH1
184-63V
184-63V
ON
47U/16V
LOW_CUT
LO
HI
LO
HI
PARALLEL
INPUTS
2U_IN_PRO.PCB
page 9
47U-16V
CONNECT
CONNECT
47U/16V
47U/16V
Rear View
Infinite 4/5/6 V2
Input PCB 1
1
1
1
LIMI_CH2 LIMI_CH1
-15V_A+15V_A
-15V_B +15V_B
POWER
1
1
CH1
100U-25V
1
CH2
VR1
1
VR2
1
8K2
104J 104J
100P
10K
15K
20K
470
100K
470
100K
10K
100P
120K
120K
104J
104J
104J
120K
120K
120K
20K
39K
20K
20K
39K
20K
20K
39K
20K
20K
120K
20K
20K 20K
20K
39K
39K
39K
10K
15K
3K6 3K6
2K4
MC33079
104J
104J
3K6
3K6
2K4
100K
10K
100P
10K
10K
10K
MC33079
10K
47K
620K10K
LM833
27P
10K
10K
10K
20K
100P
100K
100P
10K
10K
MC33079
10K
10K
LM833
27P
10K
100P
47K
10K
10K
620K
10K
10K
100K
page 10
20K
100K
470
470
120K
20K
39K
120K
20K
39K
20K
20K
MC33079
104J
10K
104J
104J
Front View
Infinite 4/5/6 V2
Input PCB 2
220U-25V
222-630V
220U-25V
OUTPUT_CH2
200E
15P-1KV
1
-FB_CH2
100U_16V_NP
22K-1%
22K-1%
15P-50V
105J
NE5532P
IN POWER
1
1
+15V0-15V
104J
220U-25V
NE5532P
15P-1KV
220U-25V
200E
22K-1%
22K-1%
15P-50V
222-630V
OUTPUT_CH1
1
-FB_CH1
100U_16V_NP
105J
page 11
16V47U_NP
25V100U
INPUT_CH2
1
25V100U
16V47U_NP
INPUT_CH1
1
11
CLIP_ON_CH2
CLIP_ON_CH1
Rear View
Infinite 4/5/6 V2
Input PCB 2
100E
104J
100E
100E
104J
100E
100E
100E
104J
100E
100E
104J
47E-1%
47E-1%
620E-1%
464-1%
620E-1%
4K53-1%
9K31-1%
39K
224J
9K31
330P
5532
220P
4K53
562J
4K7
27P
100E
7K5
10K
7K5
100E
100E
100E
JRC13600
39K
39K
C1815
150K
270E
A1015
820E
A1015
270E
820E
7K5
10K
150K
C1815
7K5
4148
4148
10K
10K
10K
10K
18K
820E
A1015
4148
4148
27P
10K
18K
102J
10K
4K7
27P
4148
10K
4148
4148
A1015
4148
18K
10K
18K
102J
562J
620E-1%
10K
10K
10K
10K
27P
820E
620E-1%
464-1%
5532
220P
4K53
4K53-1%
330P
9K31
9K31-1%
224J
39K
page 12
Infinite 4/5/6 V2
Right CH Output PCB
SF14
SF14
KA7824
1N4007
X4
1
3W_51R
333
15K
100K
3W_51R
1
50V47U
25V47U
150
0
0
TI
2K2
NE5532P
1
1
1
101101
10Kx4
F55
500
101
35V1000U
35V1000U
1K
M2
C4793
4V7
1KV152
1K
100
3W3R3
1K
1
4V7
FR157
0.5W12
0.5W12
M1
C4793
0.5W12
102
A1837A1837
MJL21193
FR157
102
0.5W12
1KV47P
1N4744A
68K
124
G
-+
1N4744A
1W33K
1N4007
1
1N5408
5W_0R22
MJL21194
MJL21193 MJL21193 MJL21193 MJL21193 SF3006PT MJL21194 MJL21194 MJL21194
3W_3K9
1N4007
5W_0R225W_0R22
3W_3K9
5W_0R22
1W22
5W_0R22
1N5408
3W_2R7
5W_0R22
M6
5W_0R22
250V104
3W_2R7
3W_1K8
5W_0R22
3W_3K9
3W_3K9
3W_1K8
250V224
5W_0R22
1W22
3W_2R7
5W_0R22
250V224
250V104
M3
M7
15A
3W_2R7
3W_3K3
200
5W_0R1
M4
15A
3W_3K3
M5
5W_0R1
5W_0R1
200
222
1N4007
1N4007
MJL21194 MJL21194 MJL21194 MJL21194 SF3006PT MJL21193 MJL21193 MJL21193
A1013
A1013
200
5W_0R1
3W_22K
FR157
3W_5R6
3W_22K
FR157
5W_0R1
C2383
5W_0R1
151
1uH
0
151
3W_10R
3W_3K3
200
C2383
3W_3K3
1
I(2U)_AMP_090624
C4793
1KV471
3W_10R
A1837
1
1W10K
953-1A-24DG-2
M8
1N4007
L90
7V5
1N4007
100K
2N5551
2N5401
100K
25V220U
3W_10K
1
3W_10K
3V3
250V104
1KV471
3V3
M9
I(2U)_AMP_090624
M10
2N5401
1N4007
100K
3K3
3W_430R
1N4007
X4
220K
3W_430R
1K5
50V22U
P6KE27A
1N4007
50V47U
page 13
POWER
5R1-1W
Infinite 4/5/6 V2
PSU PCB
BTA41-600
or
AC_IN
1
Q6025L6
1K-0.5W
1W470K
684/275VAC
1W470K
BLK
2W220R
KBP210
35V_470U 35V_470U
2R515
2R515
AC_OUT
+HV
+LV
80V10000uF
80V10000uF
80V10000uF
COM
-LV
-HV
80V10000uF
80V10000uF
80V10000uF
80V10000uF 80V10000uF
+-+- +-+-
ACH ACL ACL ACL ACL ACH ACH
ACH
KBPC3510S
COM COMACH
-HV
-LV
COM
+LV
+HV
ACH
KBPC3510SKBPC3510S KBPC3510S
page 14
Infinite 4/5/6 V2
Test Procedures
1. Control Board Voltage Check.
With the amplifier connected to 230VAC, check that the front panel 'standby' LED is illuminated.
If the green standby LED is illuminated then voltage is reaching the control board. If the
standby LED is not illuminated, then check the rear panel fuse.
2. Protect and Channel Power On Check.
If the front panel 'standby' LED is illuminated switch on the amplifier via the front panel 'power'
button. Both channels pink protect (P) LED's should illuminate between 1 to 2 seconds. You
should also be able to hear the relays engage as the protect LED's stop illuminating. Now
check if both channels 'on' LED's are illuminated. If one or both protect LED's stay illuminated,
this indicates a problem on the channel(s) main output board.
3. PSU Output Voltage Assessment.
Make sure the mains input voltage is 230 VAC +/- 1V and connect the - probe of a DVM to
chassis ground and the + probe to the + and - Hv, Lv outputs on the PSU board. The outputs on
the PSU board are shown in fig 1.
BTA41-600
or
Q6025L6
+HV
+LV
-LV
AC_IN
POWER
1
5R1-1W
+HV
+LV
COM
-LV
-HV
1K-0.5W
1W470K
684/275VAC
80V10000uF
80V10000uF
80V10000uF
80V10000uF 80V10000uF
-HV
+-+- +-+-
ACH ACL ACL ACL ACL ACH ACH
ACH
KBPC3510S
Here are the correct voltages for each respective Infinite model.
BLK
1W470K
COM COMACH
35V_470U 35V_470U
KBP210
2W220R
fig 1. PSU Board
80V10000uF
80V10000uF
80V10000uF
2R515
2R515
AC_OUT
-HV
-HV
-LV
-LV
COM
+LV
+LV
+HV
+HV
ACH
KBPC3510SKBPC3510S KBPC3510S
4. Channel Output Board LV Check.
Make sure the mains input voltage is 230 VAC +/- 1V and connect the - probe of a DVM to
chassis ground and the + probe to the bottom fuse on the left CH 1 output board. Do the same
with the top fuse on the left channel and both top and bottom fuses on the right CH 2 output
board. Left and right (CH 1 and CH 2) identifications are looking from the front of the amplifier.
The following voltages should be measured if the amplifier is in correct working order.
Infinite 6 V2
Left CH bottom fuse +58 VDC
Left CH top fuse - 58 VDC
Right CH bottom fuse - 58 VDC
Right CH top fuse +58 VDC
Infinite 5 V2
Left CH bottom fuse +56 VDC
Left CH top fuse - 56 VDC
Right CH bottom fuse - 56 VDC
Right CH top fuse +56 VDC
Infinite 4 V2
Left CH bottom fuse +53 VDC
Left CH top fuse - 53 VDC
Right CH bottom fuse - 53 VDC
Right CH top fuse +53 VDC
Fig 2. shows the positions of the fuses on the right channels output board.
KA7824
1N4007
1
3W_51R
15K
25V47U
100K
3W_51R
1
1
50V47U
IN4744A Diode
SF14
SF14
M2
500
X4
101
1KV152
333
1K
150
0
1
35V1000U
35V1000U
4V7
0
TI
2K2
NE5532P
1
1K
1K
101101
1
10Kx4
F55
M1
IN4744A Diode
MJL21193
C4793
C4793
FR157
0.5W12
0.5W12
4V7
100
1N4744A
124
3W3R3
G
-+
1N4744A
FR157
102
0.5W12
0.5W12
A1837A1837
MJL21193 MJL21193 MJL21193 MJL21193 SF3006PT MJL21194 MJL21194 MJL21194
3W_3K9
3W_3K9
222
102
1KV47P
68K
1N4007
1W33K
1N4007
1N4007
1
1N4007
1N5408
5W_0R225W_0R22
5W_0R22
MJL21194
3W_3K9
3W_3K9
MJL21194 MJL21194 MJL21194 MJL21194 SF3006PT MJL21193 MJL21193 MJL21193
5W_0R22
5W_0R22
1W22
3W_1K8
3W_1K8
250V224
5W_0R22
5W_0R22
1W22
3w 3k9 Resistors
3W_2R7
5W_0R22
1N5408
3W_2R7
3W_2R7
5W_0R22
fig 2. Right CH 2 Output Board
Top FuseBottom Fuse3w 3k9 Resistors
I(2U)_AMP_090624
1
3W_3K3
M6
5W_0R22
250V104
250V224
M7
15A
250V104
M3
5W_0R1
3W_2R7
A1013
200
5W_0R1
M4
15A
3W_3K3
M5
5W_0R1
3W_22K
3W_5R6
3W_22K
5W_0R1
5W_0R1
200
C2383
C4793
A1013
200
5W_0R1
FR157
FR157
1KV471
3W_3K3
151
1uH
0
151
3W_10R
3W_3K3
200
C2383
1
A1837
7V5
1W10K
3W_10K
3V3
1N4007
3W_10R
953-1A-24DG-2
3W_10K
250V104
1KV471
3V3
M9
M8
I(2U)_AMP_090624
5. Input Board Voltage Check
To check that the rear input board is receiving the correct voltage connect the - probe of a DVM
to chassis ground and the + probe to the +15 VDC & - 15 VDC inputs on the rear input board.
Fig 3. shows the location of the +/- 15 VDC inputs for both channels on the input board.
1
L90
M10
2N5401
1N4007
100K
1N4007
100K
3K3
2N5551
2N5401
3W_430R
100K
1N4007
X4
25V220U
220K
3W_430R
1K5
50V22U
P6KE27A
1N4007
50V47U
Infinite 6 V2
+HV +118 VDC
+LV + 58 VDC
- LV - 58 VDC
- HV - 118 VDC
Infinite 5 V2
+HV +112 VDC
+LV + 56 VDC
- LV - 56 VDC
- HV - 112 VDC
Infinite 4 V2
+HV +105 VDC
+LV + 53 VDC
- LV - 53 VDC
- HV - 105 VDC
The PSU is working correctly if the measured voltages correspond to the above.
Remember to check both channels output voltages.
page 15
The +/- 15 VDC for each channels input board is fed from the main output board.
The four 3w 3k9 resistors and both IN4744A diodes are responsible for the voltage step down
to 15 VDC. Fig 2. shows the location of the four resistors and two diodes.
The Infinite 4 V2 model uses two 5w 1.5k resistors in place of the four 3w 3k9 resistors, but
shares the same diodes as both Infinite 5 and 6 models.
Infinite 4/5/6 V2
CH 1 +15 VDC
1
470
100K
470
100K
1
LIMI_CH2 LIMI_CH1
470
100K
470
6. Bias Check and Trim
CH 1 - 15 VDC
CH 2 - 15 VDC
1
-15V_A+15V_A
-15V_B +15V_B
104J 104J
100K
120K
20K
39K
20K
120K
20K
39K
20K
120K
20K
39K
10K
120K
39K
20K
20K
120K
20K
39K
20K 20K
120K
20K
39K
20K
120K
120K
20K
20K
39K
39K
20K
fig 3. input board (rear view)
Test Procedures
CH 2 +15 VDC
1
POWER
15K
3K6 3K6
100P
104J
1
CH1
100U-25V
20K
100P
10K
100K
10K
MC33079
1
CH2
100P
15K
10K
10K
10K
47K
2K4
10K
MC33079
104J
LM833
104J
104J
3K6
104J
3K6
2K4
MC33079
104J
20K
10K
10K
104J
104J
620K10K
10K
27P
10K
1
VR1
10K
100K
10K
100P
20K
MC33079
100P
LM833
10K
10K
1
VR2
8K2
100P
47K
10K
10K
10K
10K
620K
10K
10K
27P
7. Current Limit Check And Trim
Turn both channels limiters off and connect each output of the amplifier to a dual trace
oscilloscope and an 8 ohm dummy load with a power rating sufficient for the amplifiers rated
output into 8 ohms. Fed both channels inputs from a signal generator capable of generating sine
waves from 20Hz to 20kHz. Set the sig gen to 100Hz and turn up the gain control on one of the
amplifiers channels until the waveform just begins to clip. Both + and - peaks should clip at the
same time and look identical. If one side of the waveform looks different, then adjust Pots 102
as shown in fig 4. until both sides of the waveform are the same. There are two 102 Pots, one
adjusts the + current limit while the other adjusts the - current limit. Do this for both channels
then display both channels on the scope at the same time and make sure all the waveforms
reach clip at the same time and look the same. Also perform this test with the amplifier in bridge
mode to check for the uniformity of the waveform.
Fig 5. shows how the waveform should look when the current limit is correctly setup.
Correct Incorrect
fig 5.
With the amplifier from cold, use a DVM to measure the voltage across one of the 5w 0.22 ohm
resistors. The voltage measured should be 1mV. If the measured voltage is not 1mV then adjust
pot 101 until you get a reading of 1mV. Fig 4. shows the position of one of the 5w 0.22 ohm
resistors and Pot 101. Check both channels and make sure the channel to channel tolerance is
below 0.4 mV. i.e. channel 1 reading 1.2 mV and channel 2 reading 0.8 mV. These values are
the same for Infinite 4, 5 and 6 models.
Pot 101 Pot 102
SF14
SF14
KA7824
1N4007
X4
1
3W_51R
15K
25V47U
100K
3W_51R
1
1
1
50V47U
M2
C4793
500
4V7
101
1KV152
333
1K
150
0
1
35V1000U
35V1000U
4V7
0
TI
2K2
NE5532P
1
1K
1K
101101
FR157
10Kx4
F55
M1
C4793
0.5W12
100
3W3R3
1N4744A
102
0.5W12
0.5W12
A1837A1837
Pot 102
5w 0.22 ohm Resistor
MJL21193
FR157
0.5W12
1N4744A
124
G
-+
MJL21193 MJL21193 MJL21193 MJL21193 SF3006PT MJL21194 MJL21194 MJL21194
3W_3K9
3W_3K9
222
102
1KV47P
68K
1N4007
1W33K
1N4007
1N4007
1
1N4007
1N5408
5W_0R225W_0R22
5W_0R22
MJL21194
3W_3K9
3W_3K9
MJL21194 MJL21194 MJL21194 MJL21194 SF3006PT MJL21193 MJL21193 MJL21193
5W_0R22
5W_0R22
1W22
1N5408
3W_1K8
3W_1K8
250V224
5W_0R22
5W_0R22
1W22
fig 4. Right CH 2 Output Board
Test Points
I(2U)_AMP_090624
1
3W_2R7
5W_0R22
5W_0R22
3W_2R7
250V224
3W_2R7
250V104
M3
5W_0R22
3W_3K3
M6
250V104
M7
15A
5W_0R1
3W_2R7
A1013
200
5W_0R1
M4
15A
3W_3K3
M5
5W_0R1
3W_22K
3W_5R6
3W_22K
5W_0R1
5W_0R1
200
C2383
C4793
A1013
200
5W_0R1
FR157
151
FR157
200
C2383
3V3
1KV471
3W_3K3
1uH
0
3W_10R
151
3W_10R
3W_3K3
250V104
1
3V3
A1837
page 16
8. Output Power Check
While the amplifier is still connected to the scope, sig gen and 8 ohm dummy load, connect a
true RMS volt meter across the output of one of the channels. Run both channels and the same
time and check that the voltages measured on each channel are the the same as listed below at
50Hz, 100Hz, 1Khz and 20kHz. Make sure both channels output limiters are on during this test.
1
L90
M10
7V5
2N5401
1W10K
1N4007
3W_10K
100K
1N4007
100K
3K3
2N5551
1N4007
2N5401
3W_430R
100K
1N4007
X4
25V220U
953-1A-24DG-2
1KV471
M9
220K
3W_10K
3W_430R
1K5
50V22U
P6KE27A
1N4007
M8
50V47U
I(2U)_AMP_090624
Infinite 6 V2
66v into 8 ohms
Both ch driven
Infinite 5 V2
64v into 8 ohms
Both ch driven
Infinite 4 V2
60v into 8 ohms
Both ch driven
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