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96
Service Manual
Third edition, June 1997
9.9.2 Indicated inert gas pressure always the same
IG pressure sensor’s opening to the tank may be clogged.
• Clean the sensor’s opening to the tank. See chapter 6.4.
IG pressure sensor faulty.
• Replace sensor, see chapter 6.4.
9.10 Tank Display Unit
9.10.1 Display on TDU not working.
No voltage supply
• Check fuses in TDU-Power Supply. See chapter 8.2.
• Check power cables and DC distribution to TDUs.
Communication failure
• Check communication cables
• Check I/O Box. See chapter 4 and 9.4.
9.11 Portable Readout System:
9.11.1 Indication of communication error (CERR) on PRU.
Low walkie-talkie battery voltage
• Charge battery. This may be necessary even if voice communication
works.
Bad radio conditions.
• Move PRU (walkie-talkie) to another position. This may be necessary
even if voice communication works.
• Check base radio antenna.
Low volume control on either radio.
• Increase volume control.
Incorrectly adjusted squelch control on either radio.
• Adjust squelch (if any) to low level without noise between
transmissions.
9.11.2 No voice communication between walkie-talkie and base radio (PRS).
No power supply.
• Check batteries in walkie-talkie and power supply to base radio.
Unit faulty.
• Replace units one by one: base radio, walkie-talkie, PRU, PRS
Interface Board in I/O Box.
Cable faulty.
• Check the cabling between base radio and I/O Box.
9.11.3 No display on PRU.
Low walkie-talkie battery voltage
• Walkie talkie battery needs to be recharged
PRU cable faulty.
• Replace cable.
PRU faulty.
• Replace.