Huawei P20 - Maintenance Principle (Reception)

EML-L29V100R001 Advanced Maintenance Manual V2.1
INTERNAL
2019-6-25
Huawei Confidential
Page 58 of 67
4.17.4 Maintenance Principle (Reception)
Signal flow in the B1/B2/B4 reception circuit: U3301 ← U3901 ← U3501 (MB module) ← U3701 (DPDT)
← Z3701 (diplexer) ← J3703 ← antenna spring
Signal flow in the B5/B8 reception circuit: U3301 ← U3901 ← U3401 (LB module) ← U3702 (DPDT) ←
Z3701 (diplexer) ← J3703 ← antenna spring