Page 1
_VTOP
B2_P
B2_N
B3_P
32
1
+
EL2257C
E
14
114
U11:3
EL2257C
IX2
DR2
14
13
C
-
U11:1
DS
G
32
1
+
EL2257C
E
13
C
-
U14:1
56
7
+
EL2257C
E
9
8
C
-
U11:2
DS
G
This connects to
chassis gnd at the
rear panel.
_BOP
56
7
+
EL2257C
E
9
8
C
-
U14:2
1 2
_SPK
_SPK_GND
DS
G
1
2
_BGND
EL2257C
EL2257C
U13:2
56
7
+
E
9
U12:2
8
C
-
DS
G
56
7
+
E
9
8
C
-
EL2257C
EL2257C
13
13
U13:1
U12:1
32
1
+
E
14
C
-
B1_P
114
U12:3
EL2257C
B1_N
IX1
DR1
32
1
+
E
14
C
-
B3_P
DS
G
114
U14:3
EL2257C
IX3
DR3
DS
G
_VBOT
PM_REF
DS
G
DS
G
114
U13:3
EL2257C
IX4
DR4
ITEM NO.QTY PART NO. DESCRIPTION VENDOR
Page 2
IX1
DR1
DR3
IX3
IX2
DR2
DR4
IX4
C129
22u-25V
C125
PM_REF
22u-25V
_BOP
_BGND
_VBOT
_VTOP
U21:1
14
13
CA3054M96
U21:3
5
CA3054M96
1
2
3
4
_BGND
_BOP
_VBOT
_VTOP
U21:2
8
9
11
12
CA3054M96
_BGND
7
6
_BOP
_VBOT
C126
22u-25V
B3_N
CWCCW
W
DN_DRV
HOT
UP_DRV
Page 3
_V200
_N_STEP
Values shown preclip a fixed
5 volts below the rails up to
15 amps of output current.
After that, preclip advances
120 mV per ampere output,
for 12v preclip at 70 amps.
CLIP
Gain = 1/37.5
6
5
I_MON
3
+
1
2
-
5V=187V
Positive = Clip
7
+
5
+
7
6
-
2
-
1
3
+
2
1
3
+
VP
VN
CLAMP_SIG
0.84 atten.
3
+
1
2
-
_BOP
MUTE
With values shown, the effective
step switch time delay is 4us
flat out to 50 KHz.
-POL-
5
+
6
-
3
+
7
14
10 12
9
+
15
16
13
-
VP
VN
1
2
-
P_ISENSE
N_ISENSE
+POL+
DIFF_AMP_BIAS
Closed loop gain
=37.5 or 31.5 dB
_SPK_GND
_BOP
-POL-
_SPK
PRE_LIM
REREF
-POL-
Gain = 1.67
Limiter is shown in "fast clip-tracking"mode.
To convert to a slow attack/release limiter,
open the 3 places shown shorted with lines,
and make the connection shown by the
arrow line.
+15V_
84
5
+
6
-
-15V_
VP
7
-POL-
116
3
7 5
8
VN
+
2
1
4
-
VP
VP
GAIN_RETARD
CLIP_FEED
VP
LOSS_OF_FEEDBACK
DN_DRV
VN
UP_DRV
Page 4
8
STANDBY
STANDBY
MSP_VMON
MSP_VMON
D_GND
MSP_IMON
MODE_FLAG
CLIP_
SIG_GNDSIG_GND
CH_IN_NCH_IN_N
CH_IN_PCH_IN_P
I_SET
7
6
5
4
3
2
1
J6:1
1
PWR_GND
PSENABLE_A
I_SET
PWR_GND
PSENABLE_K
POT_TOP
SHED_V SHED_V
+15V
PSENABLE_A
1
2
3
4
5
6
7
8
9
MSP_VMON
MSP_IMONMSP_IMON
-POL-
+POL+
280 KHz LPF
2
-
3
+
PSENABLE_K
1
+POL+
C88
47-10NP-10%
+POL+
REREF
POST_POT_NPOST_POT_N
POST_POT_PPOST_POT_P
PRE_LIMPRE_LIM
+15V_+15V_
SMPS_VSMPS_V
-15V_-15V_
10
11
12
13
14
15
16
C63
22u-25V
C68
22u-25V
B1_P
B1_N
SMPS_ON
PRE_LIM
REREF
PROTECT
-POL-
LOSS_OF_FEEDBACK
STANDBY_LED
CLIP
-POL-
CLIP_FEED
V_MON
+15V
J6:2
2
J6:3
3
J6:4
4
J6:5
5
J6:6
6
J6:7
7
J6:8
VP
VN
8
J6:9
9
J6:10
10
J6:11
11
J6:12
12
J6:13
13
J6:14
14
REREF
POST_POT_N
POST_POT_P
SIG_GND
STANDBY_LED
SIG_GND
VP
VN
+15V
V_MON
PROTECT
PWR_GND
CLIP_FEED
J6:15
15
J6:16
16
CLIPCLIP
PWR_GND
Page 5
VP
Current gain: 22,460.
3.0 mA total set curent
results in 68A peak output.
Minumum at full cut-back is
250 uA or 5.6A output.
PROTECT
_V50
FAN_N
DIFF_AMP_BIAS
SMPS_ON
MUTE
I_SET
Nominal I_SET = 3ma to 5ma.
Amp is fully on at I_SET>1ma.
Above 3ma fan is unaccellerated.
From 3ma to 1ma speed rises.
Below 1ma fan speed reduces
back linearily to normal speed.
C117
22u-25V
600ms delay to enable audio.
1
2
3
4
C55
22u-25V
Fan idles at 10V up
to 60C. From 60C to
80C fan ramps from
10V to 24V. At 85C
fan V = 28V MAX.
(Note that SMPS can
also speed fan up.)
B3_N
_N_STEP
200ms delay to disable audio.
5
+
7
6
-
VN
GAIN_RETARD
2
1
VP
3
DS
G
6
-
7
5
+
Gain = 1/37.5
-POL-
VP
STANDBY_LED
PSENABLE_A
_BOP
PSENABLE_K
VN
_BGND
_BOP
_SPK_GND
V_MON
MSP_VMON
HOT=250uA
@ 80 deg C.
HOT
5V = 100 deg C.
1
U1
2.5V-1%
5
SNAPPER PTC
6
-
7
5
3
+
2
-
VP
The "HOT" threshold is 80C
Cutback begins at 100C and
full shutdown happens at 110C.
(+/- 3 degrees)
VN
+
Total Gain = 16.85dB
2
-
1
3
+
+
7
6
-
P_ISENSE
N_ISENSE
I_MON
MSP_IMON
Page 6
Clamps caps to 48-54V
_V200
CLAMP_SIG
V_MON
LOSS_OF_FEEDBACK
D S
G
VN
_V150
5
+
7
6
-
_N_STEP
NOTE: This opamp must not
clamp its input terminals
together. TL072 or EQIV!!!
5
+
7
6
3
+
1
2
-
-
VN
5
+
7
6
-
VN
DS
G
_V150
DS
G
_V100
_N_STEP
_V100
5
+
7
6
-
VN
3
+
1
2
-
VN
5
4
3
2
1
PROTECT
SHED_V
I_MON
2
-
3
+
+
1
-
3 volts here signifies
50 amps output, so
load is likely 2 ohms.
1
DS
G
_V50
3
+
1
2
-
_N_STEP
VN
3
2
VN
5
+
7
6
-
VN
B4_P
C49
C19
22u-25V
C33
22u-25V
VN
VP
84
84
VN
84
84
84
C48
22u-25V
C30
C31
22u-25V
B4_N
22u-25V
22u-25V
_V50
_VTOP
_VBOT
_N_STEP
Page 7
B1_P
+15V
C62
22u-25V
VP
C111
22u-25V
1
8 7
B2_P
2
C107
22u-25V
VN
B1_N
12 11
10 914 13
B2_N
B3_P
B3_N
B4_P
B4_N
VP
1
2
2
6 3
1
2
7
DRAIN
SOURCE
CONTROL
D
S
C
64
84
2 1
84
84
VN
84
84
84
C6
22u-25V
C7
22u-25V
84
Page 8
A_POT_TOP
A_REREF
A_POST_POT_N
A_POST_POT_P
SIG_GND
A_STANDBY_LED
SIG_GND
A_VP
A_VN
A_+15V
A_V_MON
A_PROTECT
PWR_GND
A_CLIP_FEED
A_CLIP
PWR_GND
+POL+
J501:2
J501:4
J501:6
J501:8
J501:10
J501:12
J501:14
J501:16
J501:1
J501:3
J501:5
J501:7
J501:9
J501:11
J501:13
J501:15
-POL+POL+
R509
10K-DET-THRU-PCB
U501:2
TL072
TL072
U501:1
Page 9
B_POT_TOP
B_REREF
B_POST_POT_N
B_POST_POT_P
SIG_GND
B_STANDBY_LED
SIG_GND
B_VP
B_VN
B_+15V
B_V_MON
B_PROTECT
PWR_GND
B_CLIP_FEED
B_CLIP
PWR_GND
+POL+
J601:2
J601:4
J601:6
J601:8
J601:10
J601:12
J601:14
J601:16
J601:1
J601:3
J601:5
J601:7
J601:9
J601:11
J601:13
J601:15
-POL-
R609
+POL+
10K-DET-THRU-PCB
U601:2
TL072
TL072
U601:1
Page 10
SW1:4
SW1:1
220p
C300
220p
C302
220p
C400
220p
C402
U300:1
U300:2
U400:2
U400:1
TL072
TL072
E2
E3
TL072
TL072
SW1:3
SW1:2
Page 11
C1
220p
Page 12
Page 13
ITEM NO.QTY PART NO. DESCRIPTION VENDOR
Page 14
V+17.2
HOT
PRI_LO
PRICAPCT
PRI_HI
SWITCHEDHV
V+17.2
V+17.2
V+17.2
PRI_LO
SYNCOUTB
OUTA
RELAY/AMP_DRIVE
PRI_LO
PRI_LO
V+17.2
NEUTRAL
PRI_LO
PRI_LO
PRI_LO
SWITCH_INHIBIT
PRI_LO
V+17.2
SWITCH_INHIBIT_DRIVE
PRI_LO
PRI_LO
PRI_LO
PRI_LO
SOFTSTART
PRI_LO
PRI_LO
PRI_LO
PRI_LO
XFM_NTC+
XFM_NTC-
V+17.2
PFC_NTC+
PFC_NTC-
COR_NTC+
COR_NTC-
RELAY/AMP_DRIVE
PRI_LO
PRI_LO
SHUTDOWN_NOT
PRI_LO
V+17.2
PRI_LO
PRI_LO
200V
150V
100V
50V
HVCOMMON
Page 15
HOT
NEUTRAL
AC_LINE
AC_LINE_LO
D15 >> D18
L1
V+17.2_FLOATING
V+17.2_FLOATING
PUMP_POS
2 Watts
Max Dis.
PRI_HI
PRI_HI
PRICAPCT
PRI_LO
2 Watts
Max Dis.
PRI_LO
PUMP_NEG
PUMP_NEG
PUMP_NEG
PUMP_NEG
PRI_HI
cut board out,
under body
3
2
PRI_LO
V+5
PRI_HI
V+5
+
-
RELAY/AMP_DRIVE
1
375v to 385V
Reg Range
2.5v
PRI_LO
V+5
V+5
Scale Factor
1V = 150V
5
+
6
-
Hard Limit
at 395V-400V
V+5
7
V+5
PRI_LO
PRI_LO
AC_LINE
26Kohm @ 60Hz
V+5
PRICAPCT
12V
(Unused)
15v
pri
5v
PUMP_NEG
V+5
PRI_LO
15v
V+17.2
PRI_LO
PRI_LO
Stop
Threshold
PRI_LO
PRI_LO
of
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