Korg DSS-1 Service Manual

13. TROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDE
In this chapter, a simple explanation is given of how to troubleshopt the DSS-1.
Note:
Checking of the WAVE RAM on the TG circuit board
(KLM-782) and the floppy disk drive are explained in
the description of the special test program (p.32).
I Start the system up as follows.
1. Turn the power switch ON. The LCD indication is
shown in Fig. 1.
Fig. 1
• *•
***
KORG DSS-1
SAMPLING SYNTHESIZER
2. Two to three seconds later, the LCD indication
becomes as shown in Fig. 2.
Fig. 2
*••
SYSTEM MODE
SELECT (1-9): _
• ••
3. Insert an accessory floppy disk into the floppy disk
drive. Turn No. 1 key On (GET SYSTEM). The LCD
indication becomes as shown in Fig. 3 and the
ENTER key LED flashes.
Fig. 3
F1 GET SYSTEM: A
Select & Press ENTER
4. When the ENTER key is turned ON, the ENTER key
LED goes off and the indication becomes as shown in
Fig. 4.
Fig. 4
F1 GET SYSTEM: A
Are you sure (Y/N)
5. Now if the YES key is turned ON, the floppy disk drive
is accessed, and the indication becomes as shown in
Fig. 5.
Fig. 5
F1 Loading...
Please Wait a Minute
6. When loading is completed, the indication becomes
as shown in Fig. 6 and normal pronunciation is per
formed, producing a sound indicating that all keys
have been loaded.
Fig. 6
F1 SYS: A Completed
Select (1-9): _
IPROBLEM 1
The indication in Fig. 1 does not appear. (Note: It can
also happen that the indication appears but the BACK
lamp does not light up.)
Does the LCD BACK LAMP
light up blue?
YES
There is trouble in the power
supply circuit (KLM-786) or
control circuit (KLM-1013).
Which unit is bad can be judged by successively
replacing first KLM-780 (or part thereof) and then the
LCD module by good units. If the trouble is in
KLM-780, check the CPU, ROM RAM and I/O (8155).
In the case of the LCD module, the entire module has
to be replaced.
There is trouble in CPU 1
(KLM-780) or the LCD |
module.
59
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Korg DSS-1 Specifications

General

Brand	Korg
Model	DSS-1
Category	Synthesizer
Language	English