279
M4.8-1055-069
03 Rev. 10/09
ELECTRICAL
Event Code 728
Event Code 728
ECR5 Height ENCODER.
The optional Height Encoder input has changed with-
out a raise or lower command.
Step 1: Using Analyzer A2.1.5, monitor count value
while lifting and lowering mast above staging.
• If: Count not consistent with lift operation.
– Then proceed to Step 2.
• If: Count follows lift operation.
– Then replace ACCESS 1.
Step 2: Verify mechanical operation of ECR5 is cor-
rect.
• If: Mechanical operation not correct.
– Then repair ECR5.
• If: OK.
– Then proceed to Step 3.
Step 3: Check power supply to encoder at CA622-1 (+)
and CA622-4 (-). Should be approximately 5 Vdc.
• If: Power supply is not 5 Vdc.
– Then proceed to Step 4.
• If: Power supply is 5 Vdc.
– Then proceed to Step 5.
Step 4: Check voltage across pins CA215-10 and
CA215-12 of ACCESS 1.
• If: 5 Vdc.
– Then repair/replace wiring or connection be-
tween CA215-10 and CA622-1 or between
CA215-12 and CA622-4.
• If: Not 5 Vdc.
– Then replace ACCESS 1.
Step 5: Check continuity from CHA and CHB wires
(CA622-2 & -3) to ACCESS 1 (CA215-11 and
CA215-5).
• If: No continuity.
– Then repair wiring or connections.
• If: Continuity.
– Then replace ECR5.
Figure 16081
Crown 2007 PF15665-69 Rev. 10/09
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