LG Multi V5 Service Manual page 183

Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and service
WARNING
troubleshooting of the Multi V product.
Figure 74: Error No. 104 Improper Connections.
Master
SODU SODU
B A
Table 82: Error No. 104 Improper Connections Checkpoint Details.
Cause
Push the reset button (If the cause in
noise, communication will fail
External Noise
Check if shielded wire is used or not.
Wrong Connection
Check connection of GND wire from
Slave ODU)
Check whether wiring A and B is incorrect.
Check 5V Voltage (Comm. 5V)
SMPS PCB
Damaged
Check Resistance of Communication IC
External PCB Check whether patterns in external PCB
Damaged
Figure 75: Checking Error No. CH104 from Main PCB (Communication IC) In Case of Power Off.
Table 83: Error No. 104 Main PCB (Communication IC) Checkpoint Details.
Check Mode
IC07C IC07C GND (pin 5)
SODU Comm. A
SODU Comm. B
Check
intermittently.
chassis
Terminal Block
are connected
Multi-Meter
Black Red
IC07C Vcc (pin 8)
Due to our policy of continuous product innovation, some specifications may change without notification.
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Slave
SODU
Checklist
Check Point Normal
Wire
Shield wire
Connected
Wire
from chassis
ODU A,B
A-A, B-B
Voltage 4.5V ~ 5.5V
Resistance
Resistance
Measured Value
Normal Abnormal
Not Normal
ERROR CODES
Error No. 104, continued.
SODU
B A
NG
Defective
Abnormal
Parts
Wire /
Non-shielded wire
External Noise
Non connected
-
from chassis
Cross connect A
-
with B
SMPS PCB
Main PCB
Open External PCB
Figure 76: Multi-Meter (Note the
Probe Color).
Red
App.
B4
(Power Off)
A4
(Power On)
B4
(Power Off)
Black
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