Fostex VR800, Руководство по обслуживанию

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VR800 / VR800Z
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4-5-3. MIDI In/Out Check
By connecting the MIDI IN and OUT ports, this test checks if
the reply against the ID inquiry is correctly received. If not, the
prompt below will be displayed.
The following is considered to be the cause of problem.
• Bad soldering of J2, U11 and surrounding circuit on the
MAIN PCB
Even if the before mentioned prompt is displayed, pressing the [EXECUTE/YES] key would reach the next test.
4-5-4. S/P DIF In/Out Check
By connecting the DATA IN and OUT terminals, this tests checks
if the S/P DIF signal output by itself is correctly received. If the
PLL circuit is not in a “LOCKED” condition, the prompt below
will be displayed.
The following is considered to be the cause of problem.
• Defect on DIGITAL OUT
- No oscillation of resonator X1.
- Connector J4, gate array U5, U20 and / or surrounding
circuit are defective.
• Defect on DIGITAL IN
- Connector J5, gate array U5, U20 and / or surrounding
circuit are defective.
- PLL circuit (U10 and surrounding circuit) are defective.
• The SETUP “DIGITAL IN” is set other than “L: - R: -”.
Even if the before mentioned prompt is displayed, pressing the [EXECUTE/YES] key would reach the next test.