HP 437B Service Manual

HP 437B
Service Sheet BD1
Troubleshooting hints
The following items are general troubleshooting techniques that are useful
when troubleshooting the Power Meter.
1.
2.
PEN
Power Supply Check
4.
8-22 SERVICE
Check all ribbon cables, wires, and coaxial cables to ensure a tight
connection.
Any cables that look worn or frayed should be checked for repeatable
continuity. If continuity is not repeatable, the cable should be replaced.
A wrench should always be used when tightening or loosening coaxial
connectors,
Any connectors that are disconnected should be inspected for damage.
Test equipment and personnel should be grounded to avoid
static-induced failures. Observe all electrostatic discharge (ESD)
precautions.
Cover Removal
Remove the four rear panel standoffs. &
Remove the four feet on the bottom cover.
Remove the four screws from the bottom cover.
Carefully separate the top and bottom covers.
Connect the negative lead of the DVM to J3 pin 8 (DGND) on the
digital board.
Measure the voltage at J3 pin 7. The voltage should read +5.0V, +.25V.
~-6. 1 43¢:
Measure the voltage at J3 pin 6. The voltage should read -15.0V, #.5V.
Record the voltage here.
-150V — -/5.902V
Measure
the
voltage
at
J3
pin
5.
The
voltage
should
read
+15.0V,
+.5V.
Record
the
voltage
here.
sisovy 4. 94/
e

HP 437B Specifications

General

Brand	HP
Model	437B
Category	Measuring Instruments
Language	English