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Remote Display Options 24683B, C & D Hydrastep 2468CB & 2468CD Manual

4-14 24685034

Indication Fault Analysis and Corrective Action

Bottom half of fault

LED illuminated and

odd LEDs flashing at

1Hz, or odd LEDs off.

Power present, but

loss of serial data.

Check that the wiring to connector PL1 in the remote

display unit is correct.

If wiring is correct, proceed as follows:

1. If a termination resistor is fitted, disconnect this from

the end of the daisy chain.

2. With an ac voltmeter, check the ac voltage between

pins 1and 5, and pins 2 and 5, on PL1.

3. An ac voltage is less than 1V indicates a fault on the

signal transmission lines. Check back to the previous

remote display in the daisy chain or to the 2468

electronics unit, as appropriate. If the correct ac

voltages are present at this location then a line break

is indicated.

4. If the ac voltages are still low then either the lines are

short-circuited or there is a board fault. Disconnect the

remote displays upstream and re-check the ac

voltages. If there is a voltage of less than 1Vac at the

2468 electronics unit (with PL3 removed) then the

display board is faulty. Remove this board and fit a

serviceable item.

Bottom half of fault

LED illuminated and

even LEDs flashing at

1Hz, or even LEDs off.

Power present, but

loss of serial data.

Check that the wiring to connector PL2 in the remote

display unit is correct.

If wiring is correct, proceed as follows:

1. If a termination resistor is fitted, disconnect this from

the end of the daisy chain.

2. With an ac voltmeter, check the ac voltage between

pins 1and 5, and pins 2 and 5, on PL2.

3. An ac voltage is less than 1V indicates a fault on the

signal transmission lines. Check back to the previous

remote display in the daisy chain or to the 2468

electronics unit, as appropriate. If the correct ac

voltages are present at this location then a line break

is indicated.

4. If the ac voltages are still low then either the lines are

short-circuited or there is a board fault. Disconnect the

remote displays upstream and re-check the ac

voltages. If there is a voltage of less than 1Vac at the

2468 electronics unit (with PL7 removed) then the

display board is faulty. Remove this board and fit a

serviceable item.

Table 4.1 (cont.) - Fault Analysis and Correction Chart

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 185 186

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