NEC MultiSync FP1355 FP1355 FP1355, Service Manual

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1.7.6 LED display
Normally the LED is lit up green during screen display and orange during power management.
However, when circuit operation error is detected, the system gets forcibly set to POWER MANAGE-
MENT mode, with the LED being lit up in the pattern given below.
* EEPROM memory error: Each of the high voltage adjustment “HVADJ” and “XPRO LEVEL” has inde-
pendent backup data. As the power is turned ON, each adjusted value is read from EEPROM, and in
case this value fails to correspond with the backup data, the situation is regarded as EPPROM memory
error, setting the system forcibly to POWER MANAGEMENT mode.
1.7.7 Status memory to EEPROM
The following contents are stored in EEPROM in order to supplement the analysis of fault and claim
causes.
(1) Operation time/Heater ON time
Operation time: Total time that the power supply switch is ON, Heater ON time: Total time
that HEATER voltage is ON, both are by 30 min. unit, and memorized in EEPROM by 2
byte in size. When the memory value becomes FFFFH, count up stops.
(2) Operating frequency memory
The input frequency for the past 3 times is memorized in EEPROM in 2*3 byte size.
In case the input frequency exceeds 3 times, the oldest memory value is discarded.
(3) Protector operation rate memory
The protector operation rate due to error in high voltage, power short-circuit on the second-
ary side or BEAM is memorized in EEPROM in 3 bytes size. The data is memorized in
EEPROM per FACTORY ADJUSTMENT and USER mode (total 6 bytes).
Table 9
Table 10
EEPROM address
0 x 0A0
0 x 0A1
0 x 0A3
0 x 0A4
Content
Lower byte of operation time
Upper byte of operation time
Lower byte of HEATER ON time
Upper byte of HEATER ON time
High voltage protector action
High voltage adjustment data error
Beam protector action
Secondary side load short-circuit
:Orange ON (1sec)
:LED OFF (1sec)
:Orange ON (4sec)
LED indication
Table 11
Content
Preceding input horizontal frequency (unit: kHz)
Preceding input vertical frequency (unit: Hz)
Input horizontal frequency two steps before (unit: kHz)
Input vertical frequency two steps before (unit: Hz)
Input horizontal frequency three steps before (unit: kHz)
Input vertical frequency three steps before (unit: Hz)
EEPROM address
06C
06D
06E
06F
070
071
Content
Rate of short circuit on the secondary side at User mode
High voltage protector operation rate at User mode
Beam protector operation rate at User mode
High voltage fail safe operation rate at User mode
High voltage / high voltage protector data EEPROM error rate at User mode
Rate of short circuit on the secondary side at Factory mode
High voltage protector operation rate at Factory mode
Beam protector operation rate at Factory mode
High voltage fail safe operation rate at Factory mode
Hogh voltage / high voltage protector data EEPROM error rate at Factory mode
EEPROM address
0 x 072
0 x 073
0 x 074
0 x 076
0 x 077
0 x 078
0 x 079
0 x 07A
0 x 07C
0 x 07D