ICS ELECTRONICS 4809A, Instruction Manual

Page: 92 / 131

5-3
5
TABLE 5-1 SELF TEST ERROR CODES
Blinking
LED Error Possible Fault
All
RDY
TALK
LSTN
Flash
Variable
Sector
Flash
Variable
Sector
Flash
Program
Memory
RAM
Flash Variable Memory corrupted and unit
reset variable memory to factory settings at
power turn-on. Power unit off and back on
to clear the blinking LEDs.
See Table 5-2 if the ERR LED comes on
when power is reapplied.
Loose Flash in socket. Check part for bent
pins and press into socket. U14 in 4899A,
U7 in 4809A or U2 in 4819A.
Defective Flash that cannot be written to.
Replace part.
Defective decoder GAL. Test and/or replace
GAL. U3 in 4899A, U16 in 4809A or U5
in 4819A.
Flash loose in its socket or has a bent pin.
Check Flash chip for a bent pin then press
te Flash chip into its socket. U14 in 4899A,
U7 in 4809A or U2 in 4819A.
Flash Memory dropped a bit. Replace the
defective Flash with a known good Flash.
Defective decoder GAL. Test and/or replace
GAL. U3 in 4899A, U16 in 4809A or U5
in 4819A.
Defective RAM. Replace RAM with new
IC. U18 or 22 in 4899A, U8 in 4809A or
U3 in 4819A.
Defective decoder GAL. Test and/or replace
GAL. U3 in 4899A, U16 in 4809A or U5
in 4819A.