Fostex D-108 Service Manual page 19

4-5-7. 8345 Vari-Pitch Circuit (48kHz) Check
The master clock is generated using the Model 8345 LRCK (J9 pin-24: EXT_LRCK). In the meantime, the adat digital
signal is generated based on this master clock. This test checks if the adat digital signal output by itself is correctly
received. If not, it means that the vari-pitch circuit does not work correctly. As a result, the prompt below will be displayed.
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If "adat error" is displayed in the before mentioned test, the above error prompt will be naturally displayed.
If the Model 8345 test is not installed in the D-108, this test will be skipped.
The following is considered to be the cause of problem.
• Wrongly connected flat cable to J9 on the MAIN PCB.
• Bad soldering of J9, U9, U3 and / or surrounding circuit
Even if the before mentioned prompt is displayed, pressing the EXECUTE/YES key would reach the next test.
4-5-8. D-108 Vari-Pitch Circuit (48kHz) Check
Using the master clock generated through the D-108 vari-pitch circuit on the MAIN PCB, the adat digital signal is output.
This test checks if the adat digital signal output by itself is correctly received. If not, it means that the vari-pitch circuit
does not work correctly. As a result, the prompt below will be displayed.
OL
0
3
6
9
12
18
24
30
42
1 2
If "adat error" is displayed in the before mentioned test, the above error prompt will also be naturally displayed.
The following is considered to be the cause of problem.
• Defects on the vari-pitch circuit (U3, U9), gate array (U5) and / or surrounding circuit.
Even if the before mentioned prompt is displayed, pressing the EXECUTE/YES key would reach the next test.
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D-108
48kHz
48kHz
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