Maintenance Principle (Transmission) - Huawei P20 Maintenance Manual

4.19.2 Maintenance Principle (Transmission)

The TDS and LTE transmission circuit frequency bands include the following three modules:
HB: B1/B2/B3/B4/B9/TDS34/TDS39
UHB: B7/B38/B40/B41
LB: B5/B8/B12/B17/B18/B19/B20/B26/B28
4.19.2.1 Maintenance Principle for the HB Module
Signal flow in the B1/B2/B3/B4/B9/TDS34/TDS39 transmission circuit: U3301 → U3501 → U3701 →
Z3701 (diplexer) → J3703 → antenna spring
2019-6-25
EML-L29V100R001 Advanced Maintenance Manual V2.1
Huawei Confidential
INTERNAL
Page 62 of 67