Akai EWV2000 - Parameter Editing - VCA Envelope; VCA Envelope Generator Settings; Source Output Level and Vibrato VCO

001 Sabjecf: Trouble countermeasure
Symptom: No sound. Fuses F3 and F4 blown.
Defective IC1 in OPERATION (B) PCB (Headphone circuit).
Cause: C87 in MAIN PCB soldered in reverse polarity.
Remedy: Replace blown fuses F3 and F4, damaged IC1 in OPERATION (B) PCB
and damaged C87 in MAIN PCB in proper polarity.
This information applies only to the models producced in October and
November 1987, bearing serial number 210xx - xxxxx to 211xx - xxxxx.
Ref. No.
3-C87
3-F3, F4
3-F3A, F4A
3-F3Br F4B
3-F3C, F4C
7-IC1
Part No. Description
EC-315769 C EC V F05 ASl 100M 16.0DC
EF-327103 FUSE TSC A 250V 500MA (J)
EF-305703 FUSE TSC 125V 630MA (A, C, Yl)
EF-668474 FUSE SEMKO T 250V 400MA (E, V, S)
EF-359342 FUSE BET T 250V 400MA (B)
EI-356160 IC M5216P
MAIN PCB LI0I9AS0IA
Service Ref. No. : K-87-004
- 1 -
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