BELARUS-
1523/1523В
/1523.3
/1523В.3
Troubleshooting
237
List of possible defects in the RHL control system
ЗНУ
and methods of their diag-
nostics
Defect
code
Description and pos-
sible cause of the
defect
Method of diagnostics and remedy
Magor defects
11
Fault in the control
circuit of the lifting
solenoid valve.
Open-circuit in the
solenoid winding
or the electromag-
net or in the elec-
tromagnet control
bundle.
Disconnect the cable assembly from the electromagnet
and check the latter for open-circuit using a tester. The
electromagnet resistance shall be not more than 2…4
Ω
. If the electromagnet is in good order, check the elec-
tromagnet control bundle for mechanical damage and
the wire for open-circuit from the terminal of the elec-
tromagnet plug-in socket to terminal (2) of the 25-pin
connector on the electronic unit using a tester (see the
electric connecting diagrams of the RHL control systems
in Section “Appendices”).
12
Fault in the control
circuit of the drop-
ping solenoid
valve. Open-circuit
in the solenoid
winding or the
electromagnet or
in the electromag-
net control bundle.
Disconnect the cable assembly from the electromagnet
and check the latter for open-circuit using a tester. The
electromagnet resistance shall be not more than 2…4
Ohms. If the electromagnet is in good order, check the
electromagnet control bundle for mechanical damage
and the wire for open-circuit from the terminal of the
electromagnet plug-in socket to terminal (14) of the 25-
pin connector on the electronic unit using a tester (see
the electric connecting diagrams of the RHL control sys-
tems in Section “Appendices”).
13
Fault in the control
circuit of the drop-
ping or lifting sole-
noid valve. Short-
circuit in one of the
electromagnets or
of the electromag-
net control wires in
the bundle
Disconnect the bundles from the electromagnet and
check the electromagnets for short-circuiting using a
tester. The electromagnet resistance shall not exceed
1.6 Ohms. Or, alternatively, measure the electromagnet
current consumption with the voltage of 6 V applied
thereto. The current shall not exceed 3.2 A. With the
connector assembly disconnected, check terminals (2)
and (14) for short-circuit (when doing so, the electro-
magnets shall be disconnected), (see the electric con-
necting diagrams of the RHL control systems in Section
“Appendices”).
14
Fault in the control
circuit of the drop-
ping and lifting so-
lenoid valves.
Open-circuit in one
of wires in the
electromagnet
control bundles.
Check the common bundle of the system for mechanical
damage. Disconnect the connector assembly from the
electronic unit, disconnect the connector assemblies
from the electromagnets, and check the wire for open-
circuiting from terminal (6) of the electronic unit connec-
tor assembly to the terminal on the electromagnet con-
nector assembly. Check the presence of the supply
voltage at terminal (5) of the electronic unit connector
assembly (see the electric connecting diagrams of the
RHL control systems in Section “Appendices”) (to do
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