Service manual

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MD-MT80W/90W/90/90C
1 MUTE MUTE terminal at CH3. MUTE ON with "L".
2 IN3+ Input terminals on forward/reverse sides of CH3(digital input).
3* NC —
4* NC —
5* NC —
6 VG Applies the supply voltage of the pre-drive unit. When VGOFF="L", the voltage on the booster circuit is
output to this terminal and it becomes the direct supply voltage of the pre-drive unit.
7 VCC1 Applies the analog-signal supply voltage.
8 IN3– Input terminals on forward/reverse sides of CH3(digital input).
9NC —
10 NC —
11 NC —
12 MUTE1 MUTE terminal at CH1, 2, and 4. MUTE ON with "L".
13 IN1R Input terminals on the forward/reverse side of CH3(digital input).
14 IN1F Input terminals on the forward/reverse side of CH3(digital input).
15 PGND1 Power GND.
16 OUT1R Output terminal on the reverse side of CH1.
17 BAT1 Power supply in the output section of CH1.
18 OUT1F Output terminal on the forward side of CH1.
19 PGND2 Power GND.
20 OUT2R Output terminal on the reverse side of CH2.
21 BAT2 Power supply in the output section of CH2.
22 OUT2F Output terminal on the forward side of CH2.
23 PGND3 Power GND.
24 IN2F Input terminals on the forward/reverse side of CH2(digital input).
25 IN2R Input terminals on the forward/reverse side of CH2(digital input).
26* VBATT/2MON Power connection terminal in the output section that monitors the half of the power supply to the output
section. It monitors the output power with the digital servo to correct its dependency on the voltage.
27 VBATT Power connection terminal in the output section.
28 S/S START/STOP terminal. Starting with "H" and stopping with "L".
29 GND Signal GND.
30 VCC2 Applies the logic-signal supply voltage.
31 CP1 Switching terminal on the booster circuit
32 CP2 Terminal to which the rectifying transistor on the booster circuit is connected.
33 CP3 Switching terminal on the booster circuit
34 CP4 Terminal to which the rectifying transistor on the booster circuit is connected.
35 VGOFF ON/OFF switching terminal on the booster circuit. Booster circuit ON with "L". Booster circuit OFF with "H".
36 IN4R Input terminals of the forward/reverse side of CH4(digital input).
37 IN4F Input terminals of the forward/reverse side of CH4(digital input).
38 PGND6 Power GND
39 OUT4F Output terminal on the forward side of CH4.
40 BAT4 Power supply in the output section of CH4.
41 OUT4R Output terminal on the reverse side of CH4.
42 PGND5 Power GND.
43 OUT3F Output terminal on the forward side of CH3.
44 BAT3 Power supply in the output section of CH3.
45* OUT3R Output terminal on the reverse side of CH3
46 PGND4 Power GND
47* NC —
48* NC —
Pin No. Terminal Name Function
IC601 VHiLV8018W+-1 :PWM Driver (LV8018W) (1/2)
In this unit, the terminal with asterisk mark (*) is open terminal which is not connected to the outside.