Kurzweil SP5-8 Service Manual

Description of Tests
SDRAM Refresh
3-3
Description of Tests
SDRAM Refresh
This test veries the write/read functionality and accuracy of the SDRAM chip (U2) attached
to the microprocessor, SH7203 (U1).
A failure of this test indicates a problem with the SDRAM chip or associated circuitry on the
Engine PCB.
MIDI Loopback
This test performs a loop-back of the serial port by sending a 23-byte pattern over the
external MIDI link. This test requires a MIDI loop (a MIDI cable that connects the MIDI Out
jack to MIDI In jack on the SP5-8‘s rear panel).
If a MIDI cable is not connected between SP5-8‘s two MIDI jacks, the display scrolls
.
A failure of this test could be caused by failure of the serial port, other MIDI circuitry, or a
problem on the Engine PCB.
Internal Flash
This test veries the manufacturer ID and the size of the NAND Flash installed. The test
then writes and reads back one or more blocks not occupied by the le system. This test also
indicates if the NAND Flash is formatted or unformatted.
A failure of this test may indicate a problem with the microprocessor (U1), NAND Flash (U3),
CPLD (U11), or related circuitry on the Engine PCB.
MARA Validity
Note: Throughout this manual many references are made to the MARA IC. MARA is the
name given to the Kurzweil Custom Sound IC.
This test veries the proper content of certain read-only registers and the read/write accuracy
of certain read/write registers on MARA. It also writes and reads back the various register
blocks in MARA that are implemented as RAM cells.
A failure of this test may indicate a problem with the microprocessor (U1), MARA (U5), or
related circuitry on the Engine PCB.

Kurzweil SP5-8 Specifications

General

Keyboard number of keys	88
MIDI-keyboard number of keys	- keys
Product color	Black
Pitch bend wheel	Yes
Interface	USB
Headphone outputs	1
Input voltage	15 V
Power source type	DC
Power consumption (typical)	15 W

Weight and Dimensions

Depth	350 mm
Width	1392 mm
Height	120 mm
Weight	21000 g