EP Equipment CPD30L1-B, Service Manual

Page: 127 / 235

REV. 05/2020
ELECTRICAL SYSTEM
9
115
9.5 DC-DC Converter
DC-DC converter provides converted voltage
for lights, horn and accelerator.
Working performance: 80V DC to 12V
9.5.2 Faults and Causes
1
Fault Turn on switches, the lights won't
light up and horn does not sound
Cause
a. DC-DC converter failure;
b. DC-DC converter circuit not
conducted.
9.5.1 Removal and Installation
-
-
-
-
Remove the right floorboard (see Section
4.2.1);
Disconnect the converter connector;
Unscrew the four screws (1,Fig3131-
50020SM) with a wrench and remove the
converter (2).
Install according to the reverse order of
removal.
Checking
- Check if the appearance of converter and its
wiring harness are in good condition, and if
the connectors are connected securely.
9.5.3 Checking and Testing
-
- Check if the converter circuit is conducted;
Provide a voltage of 80V between converter
interfaces 3 and 18:
if there is voltage output of 12V between
interfaces 4 and 17, the converter is working
properly;
if the output voltage is not 12V, the converter
needs to be replaced.
Testing
9.5.4 Control Circuit Troubleshooting
DC-DC Converter Control Circuit
(Fig3131-50022SM)
Check if the circuit is broken by using a multi-
meter:
-
-
Set the multimeter to ON-OFF;
Check if #3/#4/#17/#18 circuit is conducted.