Sony DWT-B30, Service Manual

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4-3 (E)
DWT-B30
4-2-2. RF Performance Check
After repairing the TX-172 board, be sure to perform the following check items, and check that there is no
problem.
If there is any abnormality after checking the following items, a failure in the following control signal
path may have occurred. Perform the check focusing on this control signal path.
FPGA (IC201)/DPR-396 board
→ IQ DAC (IC300)/DPR-396 board → RF circuit/TX-172 board →
CN-4088 board and CPU (IC402)/DPR-396 board → control signal path of RF circuit
Confirmation items
.
Transmission power
.
Confirmation of transmission frequency
.
BER measurement
.
Spectrum mask (UC/CE model only)
.
Spurious emissions
n
Unless otherwise specified, perform each check item with arbitrary transmission power.
Setting frequency
In the test mode used in the RF check, the frequency can be selected as shown below.
RANGE 0 RANGE 1 RANGE 2
L C H L C H L C H
L (J), (UC),
L (CE) 468.000 482.975 497.975 498.000 512.975 527.975 528.000 542.975 557.975
MH (J),
H (CE), CN 565.000 579.975 594.975 595.000 609.975 624.975 625.000 639.975 654.975
G (J) 1240.025 1252.000 1264.000
_ _ _ _ _ _
RANGE 3 RANGE 4
L C H L C H
L (J), (UC),
L (CE) 558.000 572.975 587.975 588.000 602.975 617.975
MH (J),
H (CE), CN 655.000 669.975 684.975 685.000 699.975 714.975
G (J)
_ _ _ _ _ _