2. Check Error Messages
Turn the analyzer power on. Check no error message appears on the LCD.
If no error message is displayed, continue with the
Check A1 DRAM and Flash Memory
in
this
START HERE.
If one of error messages listed below is displayed, follow the instruction described below.For
the other message, see the
Error Messages
in Messages.
Error Messages Instruction
POWER ON TEST FAILED
This indicates the power on selftest failed. Continue with the
next
Check Power On Selftest
in the chapter 6.
EEPROM CHECK SUM ERROR
This indicates that the correction constants stored in the
EEPROM on the A1 CPU are invalid or the EEPROM is
faulty. Rewrite all correction constants into the EEPROM.
For the detailed procedure, See the
Adjustments
chapter in
this manual. If the rewriting is not successfully performed,
replace the EEPROM and then rewrite the all correction
constants into the new EEPROM.
Svc
(Status Annotation) This indicates that the correction constants stored in the
EEPROM on the A1 CPU are invalid or the EEPROM is faulty
.
See the instruction of the
EEPROM CHECK SUM ERROR
message.
POWER FAILED ON - - -
One or some of A2 power supplies, +15 V, +8.5 V, +5.3 V,
+5 V,-5V, -15 V are displayed in
---
of the message. The
displayed power supplies are shut down due to the trouble
on the A2 post-regulator. Continue with the
Power Supply
Troubleshooting
chapter.
POWER FAILED ON PostRegHot
This indicates A2 power supplies, +15 V, +8.5 V, +5.3 V,
+5 V,-5V, -15 V, are shut down due to too hot heat sink
on A2 post-regulator. Cool down the analyzer for about 30
minutes. Then turn the analyzer power on. If this message is
still displayed, replace A2 post-regulator.
PHASE LOCK LOOP UNLOCKED
This indicates one or some of PLLs (phase lock loops) in
the oscillators is not working properly. These oscillators are
checked in the internal test 0: ALL INT. Continue with the
next
Check the Power On Selftest
in where the ALL INT test
is executed.
3. Check the A1 DRAM and Flash Memory
The A1 DRAM and ash memory are tested on the sequence to access the bootloader menu.
Perform the following procedure to verify the A1 DRAM and ash memory.
a. Turn the analyzer power o.
b. Push two keys
4
Start
5
and
4
Preset
5
. With keeping the two keys pushed down, turn the analyzer
power on.
c. Wait for the display shown in Figure 8-6 appears on the LCD.
d. Check no error message displayed on the LCD
.
If no error message is displayed, the A1 DRAM and ash memories are veried. Continue
with the next
Check the A1 Volatile Memory
.
Digital Control Troubleshooting 8-7
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