Epson LQ 1050 Technical Manual - Page 164

PDOS for RAM and CPU Check

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5.2.6 PDOS for RAM and CPU Check If you want to run only the RAM check or CPU check, you do not need the host computer. Install the diagnostics ROM in the printer at location IC4A. REV.-A FX-850/1050 PRINTER LOCATION IC4A DIAGNOSTICS ROM NOTE: Check does not require connection to a host computer. Figure 5-7. RAM and CPU Check (1) Turn the power on. (2) Check to see if the ONLINE LED light is on or off. (3) Check to see if any LEDs are blinking. POWER ON J (NO) POWER\ READY/PO/ONLINE LEDs ON -~ CHECK +5V LINE I (YES) J ALL LEDS TURNS OFF (NO) + CPU DOES NOT WORK. I (YES) + ONLINE LED ON (NO) q REPLACE IC7A. (YES) FINISH IC7C INITIALIZE I PAPER OUT LED ON (NO) + REPLACE IC3A. (YES) FINISH IC3A INITIALIZE 1 READY LED ON (NO) q REPLACE IC4B. I (YES) FINISH IC4B INITIALIZE J ONLINE LED BLINKS (YES) q REPLACE IC5A (RAM ERROR) (NO) 1 PAPER OUT LED BLINKS (YES) q REPLACE IC6A (RAM ERROR) (NO) I READY LED BRINKS (YES) + REPLACE IC4B(RAM ERROR) (NO) I BUZZER BEEPS (NO) q REPLACE IC7A (YES) I READ DIP SWITCHES (Perform Function. IF DIP SW1 =OOH then stop) 5-7

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REV.-A
5.2.6
PDOS for RAM and CPU Check
If you want to run only the RAM check or CPU check, you do not need the host computer.
Install the diagnostics ROM in the printer at location
IC4A.
LOCATION
NOTE: Check does not require connection to a host
FX-850/1050
IC4A
PRINTER
DIAGNOSTICS
computer.
ROM
Figure 5-7. RAM and CPU Check
(1) Turn the power on.
(2) Check to see if the ONLINE LED light is on or off.
(3) Check to see if any
LEDs
are blinking.
POWER ON
J
(NO)
POWER\ READY/PO/ONLINE
LEDs
ON
-~
I
(YES)
J
(NO)
ALL
LEDS
TURNS OFF
+
I
(YES)
+
(NO)
ONLINE LED ON
I
(YES) FINISH
IC7C
INITIALIZE
(NO)
PAPER OUT LED ON
+
1
(YES) FINISH
IC3A
INITIALIZE
(NO)
READY LED ON
I
(YES) FINISH
IC4B
INITIALIZE
J
(YES)
ONLINE LED BLINKS
1
(NO)
(YES)
PAPER OUT LED BLINKS
I
(NO)
(YES)
READY LED BRINKS
+
I
(NO)
(NO)
BUZZER BEEPS
I
(YES)
READ DIP SWITCHES
CHECK
+5V
LINE
CPU DOES NOT WORK.
REPLACE
IC7A.
REPLACE
IC3A.
REPLACE
IC4B.
REPLACE IC5A (RAM ERROR)
REPLACE IC6A (RAM ERROR)
REPLACE
IC4B(RAM
ERROR)
REPLACE
IC7A
(Perform Function. IF DIP SW1 =OOH then stop)
5-7