Reset Dsp - Furuno FM-8800D Service Manual

Key-in
CPU(H8S)
Display
U30: HD64F2377
Fig. 8.3.2 DDS/CODEC Test Block Diagram

7. RESET DSP

Reset U: 20 DSP on CPU board only. If you select this item and press [ENT] key, audio
output will pause for a moment which means DSP reset was successfully carried out.
This function checks to see what is having a problem, DSP or U30: CPU. If this test
restores modulation or demodulation problem, a problem with DSP will be the
possibility.
CODEC
U17: AK4528
ADUTL ADUTR
VIDEO L VIDEO R
DSP
CODEC
U20: ADSP2186
U10: AK4543
DDS
U25: AD9834BRU
8-17
8.3 T/A, TEST, RESET DSP
TX/RX IF OUT(37.5kHz)
CH70 RX OUT(37.5kHz)
AGC CONT(Not used)
CH70 TEST
CHK CODEC
H.S MIC
R. H.S MIC
Wing MIC
SP
VDR
H.S SP
LINE OUT
AUX R
CHK DDS
CHK DDS
TX 45MHz
(Modulated)