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Diagnosis item
Wave ROM check
1. While pressing two E keys simultaneously
power switch.
2. Select the GRAND PIANO sound.
TG | MAINP.C.B.: IC7, Ice
TG P.C.B.: 1C2, IC4
When set to the self-diagnostic mode, the Wave
ROM
outputs
a sine
wave.
The
Wave
ROMs
correspond to the keyboard keys as shown in the
I-@: MAIN-IC9, IIl-@: TG-IC4).
diagram to the right. When a key is pressed, the
Qi
corresponding sine wave sound is produced. If no
rainy
sound
is produced,
or if the sound is distorted,
the Wave ROM corresponding to that key is
Pape I-@jll-2)
1-@) L-OH-OI-D
While pressing two F keys simultaneously,
switch.
defective.
Control panel LED check
switch.
When set to the self-diagnostic mode, the test
confirm that the characters appear correctly.
Examples: 000 + 111 + 222-------------- 888 -+ 999
Keyboard ROM (IC2) check
While pressing two B keys simultaneous!
B keys
error beeps will sound.
m™ Connection between serving CHECKING DEVICE and MAIN PCB
SWITCH
CHECKING
DEVICE
CIRCUIT
Procedure
eThe key number indicates the Wave FOM
number
(I-@:
MAIN-IC7,
|-@:
TGIC2;
While pressing two G keys simultaneously, turn on the power|:
pattern is shown on the display. Monitor the display to
y, turn on the power!
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