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SECTION III
Model 4277A
Table 3-3. Error-Codes for ROM/RAM Self Test
Error Code
Meaning
Hd
AiU5 ROM is faulty.
A1U6 ROM is faulty.
A1U7 ROM is faulty.
mm
A1U8 ROM is faulty.
A1U9 ROM is faulty.
[BB|9
AlUlO ROM is faulty.
mm
A1U12 RAM is faulty.
A1U12 RAM or A6BT1
is faulty.
Table 3-4. Error-Codes for Analog Circuit Self Test
Display
Meaning
Analog Circuit is not functioning
properly.
Table 3-5. Operation Error Codes Displayed on FREQUENCY/DC BIAS Display
DISPLAY A
DISPLAY B
FREQ/DC BIAS
Meanings
Treatment
(any reading)
' D
u C
1 C
' w'
(any reading)
Illegal INTERNAL DC
BIAS operation
(Option 001).
The
internal dc bias
voltage was set
manually or via
the HP-IB when the
DC BIAS ON/OFF
switch on the front
panel was set to
Set the DC BIAS
switch to ON,
Note
Make sure that
the DC BIAS
switch on the
rear panel is
set to INT.
OFF.
3-12
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