
3. TROUBLESHOOTING
B-65165E/02 TROUBLESHOOTING AND ACTION
- 139 -
3.3.7 Alarms Related to Pulse Coder and Separate Serial Detector
(Bits for alarm identification)
#7 #6 #5 #4 #3 #2 #1 #0
<1> Alarm 1
OVL LVA OVC HCA HVA DCA FBA OFA
<2> Alarm 2 ALD EXP
<3> Alarm 3 CSA BLA PHA RCA BZA CKA SPH
<4> Alarm 4 DTE CRC STB PRM
<5> Alarm 5 OFS MCC LDM PMS FAN DAL ABF
<6> Alarm 6 SFA
<7> Alarm 7 OHA LDA BLA PHA CMA BZA PMA SPH
<8> Alarm 8 DTE CRC STB SPD
<9> Alarm 9 FSD SVE IDW NCE IFE
(1) For a built-in pulse coder
An alarm is determined from the bits of alarms 1, 2, 3, and 5. The
table below indicates the meaning of each bit.
Alarm 3 Alarm 5 1 Alarm 2
CSA BLA PHA RCA BZA CKA SPH LDM PMA FBA ALD EXP
Alarm description Action
1 Soft phase alarm 2
1 Clock alarm (serial A)
1 Zero battery voltage 1
1 0 0 0 Speed error (serial A)
1 1 1 0 Count error alarm (α pulse coder) 2
1 Phase alarm (serial A) 2
1 Battery voltage decrease (warning) 1
1 Checksum alarm (serial A)
1 Pulse error alarm (α pulse coder)
1 LED error alarm (α pulse coder)
NOTE
An alarm for which no action number is given is
considered to be caused by a pulse coder failure.
Replace the pulse coder.