Service and troubleshooting
EST3 Installation and Service Manual 8.29
Table 8-20: Local trouble pseudo points
Address Label Source Description
0621 Amp Overcurrent 3-ZAxx 1. Circuit shorted
2. Speaker wattage tap setting
exceeds output rating of amplifier
3. 70 Vrms jumper setting used with
25 Vrms speakers. .
0622 Primary Audio Output DC 3-ZAxx 1. Open DC NAC circuit, missing or
wrong value EOL resistor
2. Shorted DC NAC circuit
0623 Primary Audio Output Analog 3-ZAxx 1. Open Audio NAC circuit, missing or
wrong value EOL resistor
2. Shorted Audio NAC circuit
3. Output voltage jumper set wrong
0624 Backup Audio Output Analog 3-ZAxx 1. Open Audio NAC circuit, missing or
wrong value EOL resistor
2. Shorted Audio NAC circuit
3. Output voltage jumper set wrong
0625 Amplifier Daughter Board 3-ZAxx Defective board
0626 Fuse Supervision 3-ZAxx Open fuse in amplifier
0627 PAL Supervision 3-ZAxx Bad PAL chip. Replace amplifier.
0629 Request Backup 3-ZAxx N/A
0630 Riser Supervision 3-FTCU 1. Open circuit, missing or wrong
value EOL resistor
2. Shorted circuit
0631 User Interface 3-FTCU Ribbon cable between display and
main PC board loose or missing.
0632 Master Phone Supervision 3-FTCU Master handset internal wiring fault
0633 Handset Off Hook 3-FTCU Hook switch defective
0640 Jumper Fault 3-OPS Jumpers incorrectly set
0641 AtoD Converter Failure 3-OPS Internal module failure
0642 City Tie Open 3-OPS N/A
0652 Input Supervision Trbls 3-ASU Defective microphone or connections
0653 Phone Page Time Out 3-ASU Phone page switch has been
activated for a period which exceeds
the time limit set via SDU program
0654 Audio Hardware Mismatch 3-ASU Mismatch between 3-ASUMX
specified via SDU program and that
installed in the 3-ASU
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