Casio WK-3800 Service Manual page 20

2. AC adaptor detection check.
1 Press "TONE" button.
2 When the instrument detects that an AC adaptor is plugged in, an OK sound
sounds. "ACJ OFF" appears and an NG sound sounds when the AC adaptor
is not plugged (when batteries are used).
3. Sustain jack check. (If no pedal, this check can be skipped)
1 Press "RHYTHM" button.
2 Press "Sustain pedal" .
3 Release "Sustain pedal" .
4 NG sound, "OFF" sound this case, must be audible.
4. Low Voltage detection check.
1 Press "DRAWBAR ORGAN" button.
2 OK sound must be audible.
5. Sound Source check
1 Press "7" button.
2 The MAX sin sound sounds from Left spesker.
3 Press "8" button.
4 The MAX sin sound sounds from Both spesker.
5 Press "9" button.
6 The MAX sin sound sounds from Right spesker.
6. ROM check
1 Press "INTRO/ENDING1" button.
7. Flash memory check
1 Press "INTRO/ENDING2" button.
8. Flash memory SUM check
1 Press "SONG MEMORY" button.
9. DSP RAM check
1 Press "VARIATION/FILL-IN 2" button
10. CPU RAM check
1 Press "SYNCHRO/FILL-IN NEXT" button.
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Message on LCD
1 ACJ ON
1 SUS CHK
1 SUS ON
1 SUS OFF
1 VOLT HI
1 TG MAX L
1 TG MAX C
1 TG MAX R
1 ROM CHK
1 ROM OK
1 FMC CHK
1 FMC OK
1 FMS CHK
1 FMS 7898
1 DRAM OK
1 CRAM OK