Troubleshooting Aids; Troubleshooting Aids; Self Test; Phase-Lock Indication Leds - HP 8340B Manual

HP 8340B/41B Assembly-Level Service
Troubleshooting Aids
SELF TEST
Self test
verifies:
•
A60 microprocessor
assembly operation
•
That address and
data information can be transmitted accurately over the instrument address bus
and instrument data bus.
Refer to OVERALL INSTRUMENT TROUBLESHOOTING
for
details.
PHASE-LOCK INDICATION LEDS
Three green LEDs
in the instrument indicate when
a
phase-lock condition exists for three phase-lock
loops. Each
LED
is lit
when
its specific loop
is
phase-locked:
•
A37DS1PLL1
•
A39DS1 PLL3
•
A50DS1
YO
POWER SUPPLY INDICATION LEDS
Eight yellow LEDs indicate when the power supplies are at their required voltage. Each LED is lit
when
its specific power supply
is
up:
A35DS1 +22V
A52DS1
+5.2V
A52DS2 +20V
A52DS3 +12V
A53DS1
-5.2V
A53DS2 -40V
A53DS3
-10V
A56DS1
-15V
Three red LEDs indicate:
•
A19DS1 Voltage
Is
present on
the A19
capacitor assembly.
•
A52DS4 The
instrument
is in
shutdown due to over-temperature.
•
A62DS1 Line power
is connected.
HP 8340B/41B
Assembly-Level Service Troubleshooting Aids
A-25