Korg DSS-1 - Problem 5: No Sound Output

IPROBLEM 5
After the indication as shown in Fig. 6 is given, no sound
comes out at all.
Check according to the following procedure; mainly
check the TG circuit board.
fCheck KLM-782 connectors^
CN49 and CN50 with an os
cilloscope. Are normal
waveforms observed?
YES
l
f Check IC47 PIN 5 with an
oscilloscope to see if the
ACK signal is being entered
^correctly.
YES I
Have RAS, CAS and AD
DRESS been input correctly
into the DRAM?
YEsI
Is A/D conversion being per
formed correctly?
YES
Is a WE signal being output
to the DRAM during sampl
ing?
NO
KLM-782 is probably OK.
Check KLM-1061 and KLM-
783.
Check GATE ARRAY IC12,
IC13 and IC11.
NO|^
Check IC11.IC12 and IC13.
Check the IC37DAC and the
IC38 operational amplifier.
Nol
Check IC11.
Remarks:
Keyboard scan assignment is being done by CPU 2
(KLM-781), so also check the KBD MATRIX circuit at
the same time.
The basic method of checking if no sound comes
out in case of a special voice is the same as for
PROBLEM 5.
YES
Is the CREATE WAVEFORM
function OK?
YES I
During sampling, is a signal
being input into IC57 pin 3?
YES
\
Tol
it can be judged that there is
trouble in the IC56 SAR.
Check the LPF (IC64 to
IC69).
61
Scan by Manual Manor
http://www.markglinsky.com/ManualManor.html