Industrial Data Systems IDS 550 - Manual (Page 14)

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4. TROUBLESHOOTING GUIDE
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1. SCALE INPUT ERROR on Power Up.
The IDS550 internal switch is set for Current Loop input and
no idle current is detected. The signal wires may be reversed or
connected to the wrong pins. The meter may not be sending.
2. NO DISPLAY, NO AUDIO ON POWER UP.
Check power cable. Check the fuse on the back of the IDS550.
3. NO WEIGHT DISPLAY. (--READING SCALE--)
Check meter cable. Use the IDS550 self test function:
test scale port: display data.
If no data is displayed:
1. Verify that the meter is sending data.
2. Verify that the cable connections are correct.
3. Verify that the IDS550 RS232/Current Loop select
switch is in the correct position.
If the data displayed is not recognizable:
1. Verify that the meter baud rate is the same as the
IDS550 baud rate.
2. Verify that the meter parity selection is the same
as the IDS550 parity selection.
If there are no errors in "test scale port":
1. Verify that the IDS550 meter selection is correct.
2. Verify that the meter is sending the correct data.
4. MEMORY FULL.
The memory full message is displayed when ID memory is full.
This most often happens when the transaction report is turned
on. Erase all transactions to regain memory space.
5. MISSING DOT TROUBLESHOOTING.
Missing dots are caused by 1 or more of the following:
1. Blown fuse.
2. Blown transistor.
3. Blown drive diode.
4. Broken needle.
The table below lists the dot driver components in order of
dot position. If a dot is missing, check ALL of the
dot driver components for the missing dot. If one of the
drive diodes has failed (shorted) then IC# U16 (8255) may
have also failed.
DOT POSITION FUSE TRANS- DRIVE SNUBBER
(top of page) ISTER DIODE DIODE
. 7 F7 Q7 CR9 CR19
. 6 F6 Q6 CR8 CR18
. 5 F5 Q5 CR7 CR17
. 4 F4 Q4 CR6 CR16