Skipper GDS102 - 5. TROUBLE SHOOTING; System Status and Diagnosis

Page 64 of 77
SKIPPER Electronics AS
Edition: 2017-06-12
GDS102 Operation and Installation Manual
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Chapter: 5. Trouble shooting
5. Trouble shooting
If it is possible to cycle through the screens and view information, several assumptions may be made
regarding operation of the GDS102 system. Although some of the subsystems necessary for this basic
system operation may still suer from minor or intermittent operation disorders, the fact that it is possible
to select and observe dierent presentation screens, indicate correct operation of the following GDS102
subsystems:
• The CPU board is operating.
• The keyboard interface board is working.
• The LCD and backlight inverter PCB are working.
• The keyboard interface part of the I/O board is working.
• The power supplies on the terminal board are basically working.
Symptom Cause Remedy
Main voltages outside (acceptable range)
• +5 V CPU: < > (4.7 V - 5.3 V)
• +5 V IO: < > (4.7 V - 5.3 V)
• +12 V CPU: < > (11.3 V - 12.7 V)
• +12 V IO: < > (11.3 V - 12.7 V)
• -12 V: < > ( -11.3 V - -12.7 V)
• HIGH V: <> (128 V - 136 V)
• CPU or I/O PCB problem.
• Terminal PCB problem.
• CPU problem.
• Transceiver PCB problem.
• Terminal PCB problem.
• Interconnect problem.
• Defect power supply.
• Replace CPU or I/O PCB.
• Replace terminal PCB.
• Replace CPU.
• Replace transceiver PCB.
• Replace terminal PCB.
• Check connections between
terminal PCB and transceiver
PCB.
• Replace transceiver board and/or
terminal board.
Status Screen (screen 11) diagnosis
T2
T1
TP7 TP8
DD2
High voltage measurement.
Checking the high voltage/power reduction:
• Use a multimeter and measure the DC voltage
in TP 7 and TP 8 on Dual transceiver PCB.
Power (%) Expected voltage (V) range.
Channel 1 (TP 8).
Channel 2 (TP 7).
10 % 13 - 15 V
50 % 61 - 65 V
100 % 123 - 128 V
Note:
• When measuring, if possible, use the hold/
autohold function on the multimeter.
• These voltages are measured with a
simulator connected to the output, and
should only be regarded as guidelines for
voltages with a transducer installed.
TP7 and TP8 Testpoint (TP) location
for power reduction measurement.