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TROUBLESHOOTING SYSTEM HAS ERROR CODE
373XXA MM 5-15
Fails in
Forward only ?
Fails below
38 GHz?
Fails above
38 GHz?
Fails above 38
GHz?
Normal power at
Port 1 (S21)?
Normal power at
Port 1 (S21)?
Normal power at
Port 1 (S21)?
BufferAmp, A4 or
A8 Failure
A8,A4, or Buffer
Amp Failure
Transfer Switch
orA8 Failure
BufferAmp,A4,
orA8 Failure
RefA MUX
Coupler Failure
SPDT Switch, RefA
SQM,A8 or MUX
Coupler Failure
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
1
Go to
2
Not logical. Call
Customer Service
See Sheet 3
From Sheet 1
Figure 5-2. Error Code DE Lock Failure Troubleshooting (37397A) (2 of 3)