Korg EX-8000 - Adjustment Procedures; RAM Initialization and Test Data Loading; D;A Converter and CV Calibration

8. ADJUSTMENT PROCEDURES
PARAJMEMORY
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Caution:
1) This product has been throughly adjusted at the factory
before shipment Therefore never turn any Semi Fixed
VRs other than those required for servicing.
2) After turning on power, wait at least 15 minutes before
beginning test and adjustment.
3) Be sure to save the data on tape before loading test
data as when loading test data into EX-8000, previous
data is erased.
1. Clearing RAM and Loading Test Data
1) After keeping EX-8000 power on at least 15 minutes,
once turn off power and then on pressing number keys
[5] and [8].
2) Connect to an Amplifier etc. and confirm if there is no
sound to check all data of RAM have been erased.
3) Load Test Data. (This data is same as DW-8000's one)
*For convenience, save those chart on tape as Check and
Adjustment procedure described below is always made
with the data.
2. D/A converter, CV Check and Adjustment Procedure
(KLM-771)
1) Turn off power and then on pressing number keys [5]
and [6] at the same time.
2) Confirm if UrEF (Voltage reference) is displayed and
becomes Test Mode 1.
3) Connect a Digital Voltmeter to Test Points: [TP-AG],
[TP-REF1] allocated in leftside of the board.
GND side - [TP-AG], 4side - [TP-REF1]
4) Memorize the value of Digital Voltmeter and then
connect as follows.
♦side - [TP-CV]
5) Adjust VR1 to obtain the same value as one of +side
-ITP-REF1].
Remarks: Adjustment value is in range of 3.29V - 3.64V.
Note: Test Mode 1 cannot be cancelled till being reset.
(Power OFF - ON)
Scan by Manual Manor
http://www.markglinsky.com/ManualManor.html