ELECTRIC SYSTEM 777 SERVICE MANUAL
3-6 Published 10-01-2012, Control # 045-08
C-14 82A AO-S3
Boom Cylinder Pump Control (Servo
Driver 3)
0 to 2.8 ± 10% (110 Ma ± 10%) VDC Down;
0 to -2.8 ± 10% (-110 Ma ± 10%) VDC Up
I/O 2 J8-41
C-15 83A AO-S4 Right Track Pump Control (Servo Driver 4)
0 to 2.8 ± 10% (110 Ma ± 10%) VDC Forward;
0 to -2.8 ± 10% (-110 Ma ± 10%) VDC Reverse
I/O 2 J8-42
C-16 80FRS DO-6 Right Front Drum Clutch Free Fall 12 VDC Nominal I/O 1 J6-31-32
C-17 81FRS DO-7 Right Rear Drum Clutch Free Fall 12 VDC Nominal I/O 1 J6-34-33
C-18 80Q DO-8 Front Drum Disc Brake Solenoid 12 VDC Nominal I/O 1 J6-35-36
C-19 81Q DO-9 Rear Drum Disc Brake Solenoid 12 VDC Nominal I/O 1 J6-37-38
C-20 68KB DO-10 Engine Throttle Interface 12 VDC Nominal I/O 1 J6-39-40
C-21 8P1 — 12 VDC System 12 VDC Nominal
C-22 0 — System Ground 0 VDC
C-23 84A AO-S5 Left Track Pump Control (Servo Driver 5)
0 to 2.8 ± 10% (110 Ma ± 10%) VDC Reverse;
0 to -2.8 ± 10% (-110 Ma ± 10%) VDC Forward
I/O 3 J10-41
C-24 85A AO-S6 Swing Pump Control (Servo Driver 6)
0 to 2.8 ± 10% (110 Ma ± 10%) VDC Right;
0 to -2.8 ± 10% (-110 Ma ± 10%) VDC Left
I/O 3 J10-42
C-25 87E DO-11 Auxiliary. Drum Disc Brake Solenoid 12 VDC Nominal I/O 2 J8-21-22
C-26 DO-12 Spare I/O 2 J8-23-24
C-27 25X DO-13 Swing/Travel Alarms 12 VDC Nominal I/O 2 J8-25-26
C-28 25A DO-14 Operating Limit Alarms 12 VDC Nominal I/O 2 J8-27-28
C-29 25 DO-15 System Fault Alarms 12 VDC Nominal I/O 2 J8-29-30
C-30 8P1 — 12 VDC System 12 VDC Nominal
C-31 0 — System Ground 0 VDC
C-32 DO-16 Spare I/O 2 J8-31-32
C-33 80FLS DO-17 Left Front Drum Clutch Free Fall 12 VDC Nominal I/O 2 J8-33-34
C-34 82R DO-18 Boom Pump Enable 12 VDC Nominal I/O 2 J8-35-36
C-35 80DS DO-19 Front Drum Free Fall Light 12 VDC Nominal I/O 2 J8-37-38
C-36 81DS DO-20 Rear Drum Free Fall Light 12 VDC Nominal I/O 2 J8-39-40
C-37 NC Key Cable Plug Insert
D-01 80MA ECA1
Front Drum Flange Speed Encoder
Channel A1
7.5 VDC Plus or 0 VDC Not Moving; 3.5 VDC Moving I/O 1 J6-01
D-02 80MB ECB1
Front Drum Flange Direction Encoder
Channel B1
7.5 VDC Plus or 0 VDC Not Moving; 3.5 VDC Moving I/O 1 J6-02
D-03 81MA ECA2
Rear Drum Flange Speed Encoder
Channel A2
7.5 VDC Plus or 0 VDC Not Moving; 3.5 VDC Moving I/O 1 J6-03
D-04 81MB ECB2
Rear Drum Flange Direction Encoder
Channel B2
7.5 VDC Plus or 0 VDC Not Moving; 3.5 VDC Moving I/O 1 J6-04
D-05 ECA3 Spare Encoder Channel A3 I/O 2 J8-01
D-06 ECB3 Spare Encoder Channel B3 I/O 2 J8-02
D-07 24 MP1 Engine RPM Transducer Above 9.0 Volts AC I/O 1 J6-05
D-08 89Y3 DI-37 Front Drum Disc Brake Park Switch 12 VDC Nominal (when brake is applied) I/O 3 J10-15
D-09 89Z3 DI-38 Rear Drum Disc Brake Park Switch 12 VDC Nominal (when brake is applied) I/O 3 J10-16
D-10 89A4 DI-39 Boom Cylinder Enable 12 VDC Nominal (when brake is applied) I/O 3 J10-17
D-11 89B4 DI-40 Travel Park Disc Brake Switch 12 VDC Nominal (when brake is applied) I/O 3 J10-18
D-12 89C4 DI-41 Auxiliary Drum Disc Brake Park Switch 12 VDC Nominal (when brake is applied) I/O 3 J10-19
D-13 89Q1 DI-42 Auxiliary Drum Minimum Bail Limit 12 VDC Nominal (when brake is applied) I/O 3 J10-20
D-14 89R1 DI-43 Auxiliary Drum Maximum Bail Limit 12 VDC Nominal (when brake is applied) I/O 4 J12-07
D-15 89B2 DI-44 Swing Park Switch/Holding Brake 12 V
DC Nominal (when brake is applied) I/O 4 J12-08
D-16 RX1 — RS-232 Receptacle (Receive I/O) CPU J4-02
D-17 TX1 — RS-232 Receptacle (Transmit I/O) CPU J4-01
D-18 TX1-0 — RS-232 Receptacle (Common I/O) CPU J4-03-04
Pin # Wire # I/O # Description
Test Voltage
(DC unless otherwise specified)
Connection
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