2Service
160 Keysight 53210A/53220A/53230A Assembly Level Service Guide
Troubleshooting the Counter
This section provides a brief check list of common failures. Before troubleshooting
or repairing the instrument, make sure the failure is in the instrument rather than
any external connections. Also make sure that the instrument has been accurately
calibrated within the last year.
The instrument’s circuits allow troubleshooting and repair to an assembly level
with basic test equipment.
Unit is inoperative
– Verify that the AC power cord is connected to the instrument and to an AC
power source.
– Verify that the front-panel On/Standby switch has been pressed.
Unit fails self-test
– Ensure that all terminal connections (both front panel and rear panel
terminals) are removed while the self-test is performed.
Power supply check
1 Remove the power cord from the back of the instrument to disconnect the
counter from the power source.
2 Remove the cover as described in Chapter 3, "Replacing Assemblies".
Hazardous voltages are on the power supply assembly. Only service trained
and qualified personnel should perform the following procedure.
The AC power supply assembly is internally fused for safety reasons. It is
assumed that if the internal fuses are blown, then damage has occurred to the
power supply which will make it unreliable. Do not attempt to repair the power
supply.
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