Furuno FS-1570, Service Manual

Page: 214 / 322

7.2 Frequency
7-12
If the frequency is not within the rating, check and adjust the frequency of the crystal
oscillator on DSP board.
Table 7.2.3 Adjustment of the frequency of the crystal oscillator on DSP board
TP Adjuster Rating
Y1 (5.1200 MHz) TP2 C4 2.56 MHz ± 2 Hz
Y2 (11.8040 MHz) TP16 C45 23.608 MHz ± 10 Hz
Fig.7.2.6 DSP board
These clocks are used as follows.
DSC DSP board
Y1: Clock for CODEC, DSC Tone and SSB Tone
Y2: Clock for DSP
NBDP DSP board
Y1: Clock for NBDP and NBDP Tone
Y2: Clock for DSP and Timing clock for NBDP communication (TX/RX)
TP2: 2.56 MHz+2 Hz C4: Adjuster for CODEC CK
TP16: 23.608 MHz+10 Hz C45: Adjuster for DSP CK
Y1 and Y2 locate at
soldering side.