Service - Stanford Research Systems SR844 User Manual

Service

6-3

Service

Do not attempt to service or adjust this instrument unless another
person, capable of providing first aid or resuscitation, is present.
Always disconnect the power cord and wait at least two minutes
before opening the unit. Dangerous power supply voltages may be
present even after the unit has been unplugged.
This unit is to be serviced by qualified personnel only. There are no
user-serviceable parts inside.
Check the LED at the front right corner of the CPU and power supply
board. The unit is safe only if the LED is off. If the LED is on, do not
attempt any service on the unit.
Do not install substitute parts or perform any unauthorized modifications to this
instrument.
For warranty service or repair, this product must be returned to a Stanford Research
Systems authorized service facility. Contact Stanford Research Systems or an authorized
representative before returning this product for repair.
SR844 RF Lock-In Amplifier