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MKB
MANUAL KEYBOARD CIRCUIT BOARD
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20
es
@ The repair of the keyboard PCB and key switches.
The keyboards on the SX-PR100/PR200 employ an operating system which is unique to each unit.
This system insures touch
2. lf the Manual Keyboard P.C.B. needs to be replaced, due to physical damage, it is necessary to replace both keyboard
response accuracy.
P.C.B's at the same time.
To maintain that accuracy, please note the following points when repairing the keyboard:
3. The Data ROM (IC2) is matched to Rubber Contact Switches/P.C.B. combination and is not available separately.
1. When repairing the Rubber Contact Switches:
If this part should become defective cut jumper 15 or remove the part.
To insure touch response accuracy It may be
SSPG6003A (6 continuous)
necessary to replace the Rubber Contact Switches.
(See Step 1)
SSPG7003A (7 continuous)
4. lf the Manual
Keyboard
microprocessor
(IC1) is defective,
it can
replaced
with
a unit from
parts.
No
special
A. It is necessary to replace all of these switches if one of them becomes defective. (The replacement parts are selected
considerations are necessary.
for accuracy of touch response.)
B. Cut Jumper 15 on the Manual Keyboard
P.C.B. to disconnect the Data ROM.
(it is not necessary with the higher
tolerance switches.)
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= 9 Yazs0
NOTES:
eic's
IC1:
MN50020PGV
1C2:
not supplied
« DIODES
Di~176:
MA162A
a
=
T-25)
UT -26)
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