LTO D1 User manual

M
O
DEL: D1
/
D2
/
D
3/
D4

CONTENT
1. INTRODUCTION……………………………………………………………………………..1
2. TECHNICAL SPECIFICATION……………………………………………………………..2
3. BLOCK DIAGRAM……………………………………………………………....................35
4. SCHEMATIC DIAGRAM…………………………………………………………………….5
5. WIRING DIAGRAM…………………………………………………………………………10
6. PCB LAYOUT……………………………………………………………………………….12
7. TEST PROCEDURE…………………………………………………………....................21
8. EXPLODED VIEW & MECHANICAL PARTS LIST……………………………………..27
9. BOM…………………………………………………………………………………………..36

Fantastic audio quality even with extremely high volume levels
Solid and durable, can be mounted into a cabinet
Automatic limiter
Stereo (dual-channel), or bridge mono operating modes
Balanced XLR, 6.3 inputs / parallel outputs to ensure noiseless long wiring
Binding post and professional speak-on connectors for output
Stereo, bridge, and parallel output wiring possibility
Front panel LED indicators for power-on, signal, protection and clip
Accurate gain control
Independent DC, thermal, overload and short-circuit protection on each channel automatically protects amplifier
and speaker
Used together with line array cabinet in one audio system
Manufactured under TS16949, ISO 14001 certified management system and RoHS directive
2U rack, multi-channel high power amplifier
Class D technology, switch power, light weight and high power
The D series includes D1, D2, D3, D4. It is a line of high power, low profile, professional Power Amplifiers withLTO
advanced features and great reliability. They deliver tremendous power in only two rack spaces, providing high level
performance under the most demanding conditions. An automatic speed fan matches cooling capacity with heat
requirements. The amplifier frame contains all solid-state circuitry, using complementary silicon output devices. The
amplifier is supplied with a single moulded AC cord having an appropriate AC plug for the intended operating voltage.
The amplifier employs forced air cooling with a variable speed fan for minimum acoustic noise. Air flow is from rear to
front to avoid temperature rise inside the Rack. D1, D3 contain two independent channels and D2, D4 contain four
independent channels, with separate AC transformer secondaries, power supplies and protection system. All protection
systems, except the main AC one, are self resetting upon removal of fault, and the remaining channel shall continue
to operate. Each channel has independent protective circuitry against short circuit, over-loads and over temperature,
and also has DC protection. Each channel has also LEDs for power-on, signal, clip and protection. Standard power
connectors are used for . Input can be parallel or stereo or bridge and an high quality audio transformerpower outputs
can be added on the input stage of each channel. It provides the following features:
1. INTRODUCTION
- 1 -

14.8"(376mm) deep
11.2"(285mm) deep
Indicators (1per channel)
Distortion(AMPTE-IM)
Frequency Response
Damping Factor, at 8 ohms
Output power
Power continuous @0.5% THD . Both channels driven, 230V
8ohms per channel(RMS)
4ohms per channel(RMS)
Power EIAJ@1% THD, both channels driven, 230V
8ohms per channel(EIAJ)
4ohms per channel(EIAJ)
BRIDGED MODE
16ohms (EIAJ)
8ohms (EIAJ)
Load Protection
Power Requirements
Signal to Noise, 20Hz -20KHz
Voltage Gain
Input Sensitivity @ 4ohms
Input Clipping
Input Impedance
D1 D2 D3 D4
2CH Amplifier 4CH Amplifier 2CH Amplifier 4CH Amplifier
2 X 240W
2 X 390W
4 X 240W
4 X 390W
2 X 340W
2 X 540W
4 X 340W
4 X 540W
2 X 270W
2 X 500W
4 X 270W
4 X 500W
2 X 370W
2 X 750W
4 X 370W
4 X 750W
1 X 520W
1 X 1000W
2 X 520W
2 X 1000W
1 X 740W
1 X 1500W
2 X 740W
2 X 1500W
0.5%(THD, DIM, SMPTE)
20Hz-20kHz+/-0.1dB, -3dB points: 10Hz - 60kHz
300 at 8ohms
500
200
105dB/A weighted
40 X (32dB)
1Vrms
10Vrms (+2 )2dB
10k ohms unbalanced, 20k ohms balanced 56(36dB)
Front: AC switch, gain knobs
Power-on: blue
Operation/Protection: red
Clip: red
Rear: low pass filter, mode selector
100
Continuously 7-variable-speed fan, rear- to - front air flow
On/off muting, DC-fault load grounding relay. Internal fault fuses
AC230V,AC115V, 50-60Hz
19"(483mm) rack mounting, 3.5"(88.8mm) tall (2 rack spaces)
11.2"(285mm) deep
5.50Kg 7.90Kg 7.90Kg
5.50Kg
100Hz
Cooling
10KHz
Controls
1KHz
Dimensions
Net Weight
14.8"(376mm) deep
2. TECHNICAL SPECIFICATION
- 2 -

1 2 3 4 56
A B C D
6
54321
D
C B A
M
BREAKER
AC IN
AC SW
DIGIMOD
SIG IN
CH2 VR CH1 VR
CH3 IN
CH4 IN
GND GND
CH1 SP
CH2 SP
FAN
LED
SIN PROTCLIP
D4 FAN POWER
1 2 3
SW SLIDE-A
BRIDGED PARALLEL STEREO
3. BLOCK DIAGRAM
- 3 -
-
+
-
+

1 2 3 4
A B C D
4
321
D
C B A
M
BREAKER
AC IN
AC SW
DIGIMOD
SIG IN
CH2 VR CH1 VR
CH1 IN
CH2 IN
GND GND
CH1 SP
CH2 SP
DIGIMOD
SIG IN
CH4 VR CH3 VR
CH3 IN
CH4 IN
GND GND
CH1 SP
CH2 SP
FAN
LED
SIN PROTCLIP
SIN PROTCLIP
1 2 3
SW SLIDE-A
BRIDGED PARALLEL STEREO
1 2 3
SW SLIDE-A
BRIDGED PARALLEL STEREO
- 4 -
-
+
+
-
+
-
+
-

1 2 3 4 56
A B C D
6
5
43
2
1
D
C B A
3 2
1
U2A
NJM4580
84
U2C
NJM4580
C209 0.1uF
C210 0.1uF
C211 0.1uF
C212 0.1uF
GND
1 2 3
CN203
2.54 3P
+12V1
-12V1
C204
22uF/50V
C203
22uF/50V
1 2 3
CN101
CON3
3 2
1
U1A
NJM4580
5 6
7
U1B
NJM4580
C106
4.7uF/50V
C107
4.7uF/50V
R101
10K
R102
10K
R103
10K
R104 15K
R105 47K
GND
C103
33pF
C105 1uF
1 2 3
CN201
CON3
84
U1C
NJM4580
5 6
7
U2B
NJM4580
C206
4.7uF/50V
C207
4.7uF/50V
C208
33pF
C214
1uF
R201
10K
R203
10K
R202
10K
R207 15K
R208 47K
GND
C215
0.1uF
C109 0.1uF
R106 100R
R206 100
C104 1uF
C213 1uF
1 2 T S G 3 R
JK101
LA1117-L
1 2 T S G 3 RJK201
LA1117-L
R216 22k
R121 22k
R221 22k
R116 22k
R112
15k
5 6
7
U3B
NJM4580
3 2
1
U3A
NJM4580
5 6
7
U4B
NJM4580
3 2
1
U4A NJM4580
84
U3C
NJM4580
84
U4C NJM4580
C111
33P
R111 12K
R110 10K
R113 68R
R114 18K
R119
15K
R115 18K
R118 8K2
C113 47UF
C110
33P
C112
33P
C114 33P
C219 33P C217 33P
GND
GND R120
68R
C115 47UF
GND GND
R117 10K
R219 15K
R220 68R
R218 12K
R217 10K
R214 18K
R215 18K
R213 68R
R210 10K
GND C220
47UF
C216 33P
C221 47UF
GND GND
R212 15K
C218 33P
R211 8K2
GND
R8 10K R7 10K
R10 10K R9 10K
C101 33P
C102
33P
C201 33P
C202
33P
GND
GND GND
GND
GND
GND
GND GND
GNDGND
GND
GND
R2 10K
R6 10K
12
34
56
78
910
1112
1314
1516
SW102 HSWL-3/16P 3
2
1
U5A
NJM4580
5 6
7
U5B
NJM4580
4 8
U5C
NJM4580
GND
R1 27K
R4 27K
R5 1K
GND
C1 33P
2
4
6
SW101B HSWA-2/3P
1
5
3
SW101A HSWA-2/3P
CH1
CH2
1 2 3 4 5 6
CN1
CN-6P
GND
R3 27K
4. SCHEMATIC DIAGRAM
D3 INPUT(1/1)
- 5 -

1 2 34
A
B
C D
4
321
D
C
B
A
3 2
1
IC1-1A LM4558
3 2
1
IC2-3A LM4558
R1-4 10k
R2-3 10k
R1-2 10k
R2-2 10k
GND
GND1
R1-1 10k
R2-1 10k
84
IC1-1C
LM4558
R2-4 10k
R1-5 10k
LED2_1 RED
LED1_1 RED
GND1
GND
PROTECT3 PROTECT1
+12VDC1
+12VDC
5 6
7
IC2-3B LM4558
5 6
7
IC1-1B LM4558
R2-7 10k R1-7 10k
R2-6 10k R1-3 10k
GND1
GND
R2-5 10k R1-6 10k
R2-8 10k R1-8 10k
LED2_2 RED LED1_2 RED
GND1
GND
PROTECT4 PROTECT2
+12VDC1
+12VDC
84
IC2-3C
LM4558
1 2 3 4 5 6 7 8
CN2 CON8
PROTECT4
PROTECT3
+12VDC1
GND1
Q2-2
C1815
Q2-1 C1815
Q2-3 C1815
C2-1 10UF
C2-2
10UF
R2-9 820K R2-11 100k
R2-13 1k
R2-18 5k
R2-14 2.2k
R2-17 10k
R2-23 2.2k
R2-19 2.2k
D2-1 4148
GND1
GND1
GND1
Q2-5
C1815
Q2-7 C1815
Q2-6 C1815
C1
10UF25V
C2 10UF
R2-10 820K R2-12 100k
R2-15 1k
R2-21
5k
R2-16 2.2k
R2-20 10k
R2-24 2.2k
R2-22 2.2k
D2-3
4148
GND1
GND1
+12VDC1
GND1
C2-3 47UF
C1-5 47UF
1 2 3 4 5 6 7 8
CN1 CON8
GND
PROTECT1
+12VDC
PROTECT2
+12VDC
GND
Q1-1
C1815
Q1-7 C1815
Q1-2 C1815
C1-1 10UF
C1_2
10UF
R1-9 820k R1-11 100k
R1-13 1k
R1-21 5k
R1-14 2.2k
R1-17 10k
R1-23 2.2k
R1-18 2.2k
GND
D1-3
4148
GND
GND
D1-4 4148
GND
R1-25 2.2K
R1-20
2.2k
R1-24
2.2k
R1-19
10k
GND
R1-22 5k
Q1-4
C1815
R1-15 1k
Q1-8
C1815
R1-12
100k
Q1-5
C1815
R1-10 820K
C1-4 10UF/25V
C1-3
10UF/25V
1 2 3
CN3 CON3
1 2 3
CN4 CON3
1 2 3
CN5 CON3
1 2 3
CN6 CON3
VR1 VR
VR2 VR
VR3
VR
VR4
VR
LED1_3 RED LED1_4 GRN
LED1_5 RED LED1_6 GRN LED2_5 RED LED2_6 GRN
LED2_3 RED LED2_4 GRN
+12VDC
D3-FR(1/1)
- 6 -

1234
A
B
C D
4
32
1
D
C
B
A
DL1 LED
DL2 LED
DL3 LED
DL LED
G
V+
D3-LED(1/1)
- 7 -

1234
A
B
C D
4
32
1
D
C
B
A
1
2
CN1 HC2PH
1
2
CN2 HC2PH
+2
-2
+1
-1
+-- +
XL1 XL-4P
+2
-2
+1
-1
+-- +
XL2 XL-4P
D4 OUTPUT(1/1)
- 8 -

1234
A
B
C D
4
32
1
D
C
B
A
C1
470uF/35V
IN
IN
G
G
OUT OUT
U1
LM317T
1
2
R4 1K8
R3 150R
C2
100nF/50 cer
C3
10uF/63
A
K
D1
1N4004
1
2
CN4 2P2.5
+12V
FAN
R2 NTC 500R
R1
NTC500R
C4 10UF
1
2
CN3 CN-2P-180
R5 47K
12V
1
2
3
4
5
6
7
8
PT1
D3 (1.5A 200V)
D4 5.6V
1
2P1
PC250
1
2
P2
PC250
1
2P3
PC250
D4 FAN POWER(1/1)
- 9 -

1234
A
B
C D
4
321
D
C
B
A
AC SW
DJMOD
FAN POWER
CH3
CH4
FAN
OUTPCB
CON6
CON8
CON7
DIGIMOD LED OUT
P1 P3
CN1
AC
INPUT BREAKER
5. WIRING DIAGRAM
D1/D3
- 10 -

1 2 3 4
A B C D
4
321
D
C B A
AC SW
DIGIMOD DIGIMOD
FAN POWER
CH7
CH2
CH3
CH4
FAN
OUTPCB
CON6
CON8
CON7
DIGIMOD LED OUT
P1 P3
CN1
CN1
CN6
DIGIMOD LED OUT CN8
AC
INPUT
BREAKER
D2/D4
- 11 -

󲓱

󲓱
󲓱

- 12 -
6. PCB LAYOUT

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
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󲓱
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󲓱
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󲓱
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
󲓱
󲓱

󲓱

󲓱
󲓱



󲓱

󲓱
󲓱

󲓱

󲓱
󲓱

󲓱

󲓱
󲓱
󲓱
󲓱


- 13 -

 
- 14 -



- 15 -



- 16 -



- 17 -



- 18 -