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VG-8EX
2. Press [PAGE] button. "JIG MENU 2" screen
will appear.
3. Press [F4] "GK" and the screen changes as
shown in Fig. 14.
4. On the GK-2A, turn [SYNTH VOL] from CCW
to CW and verify that "Vol" bar graph on the
screen changes from 00 to 7F.
5. Repeatedly press [S1] and [S2] on GK-2A and
verify that "S1=" and "S2=" on the top line of
the screen switch between "ON" and "OFF".
6. Play the guitar and check level change on each
string bar graph on the screen (Fig. 15).
Pressing [F1] will change the input gain either
to 0.5, 1.0, 2.0 or 2.5. The current gain setting
is shown on the top line of the screen, e.g. "G
= 1.0" as shown in Fig. 15.
7. Connect headphones to PHONES socket.
Play the guitar and check the output sound.
Press [F3] button to change output mode. The
"L= " on the top line of the screen showes the
current mode: "L=L" (LEFT)," L=R" (RIGHT),
"L=S" (STEREO).
Verify that the output sound match the output
modes.
If error:
Check: IC48, IC49, IC50, IC51, IC54, IC22 and
IC23 and associated components (analog input
circuit) on main board.
To end the test:
Press [SYSTEM] and the LCD returns to "JIG
MENU 2" screen.
10
(Fig.14)
(Fig.15)
[ 11 ] CSP test
Purpose:
Test CSP1 (IC24) and CSP2 (IC25).
Test steps:
1. Press [PAGE] button. "JIG MENU 2" screen
will appear.
2. Press [F5] "CSP".
3.Press [F1] "SINGLE" and the following
memories will be test in sequence: CSP1
external memories (IC26, IC27, IC28); CSP1
internal memory; CSP2 external memories
(IC29, IC30, IC31); CSP2 internal memory. The
screen shows the results as shown in Fig. 16.
"OK": good, othewiser error
(see If error, below).
Note:
Pressing [F3] "LOOP" performs CSP test 100
times.
The number of tests is indicated by "COUNT" on
the top line of the screen (Fig. 17). COUNT will
stop increment as the test stops upon occurence
of error.
If error:
CSP1 ERAM: check IC24, IC26, IC27 and IC28
and associated components on main board.
CSP1 PRAM, CRAM and IRAM: check IC24 of
main board.
CSP2 ERAM: check IC25, IC29, IC30 and IC31
and associated components on main board.
CSP2 PRAM, CRAM, IRAM: check IC25 of main
board.
To end the test:
Press [SYSTEM] and the LCD returns to "JIG
MENU 2" screen.
(Fig.16)
(Fig.17)
Jul, 1998
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