Chapter 2 Diagnostics; Diagnostic Tests; Entering Diagnostics - Kurzweil PC3x Service Manual

Chapter 2
Diagnostics

Diagnostic Tests

The following lists the diagnostic tests available for the PC3x.
Note: Throughout this manual many references are made to the MARA 1 and MARA 2 ICs. For
service personnel unfamiliar with the PC3x, MARA is the name given to the two Kurzweil
Custom Sound ICs.
Warning: If possible, save all user programs and setups before entering diagnostics or
performing maintenance or repair. For instructions, refer to Saving User Data in Chapter 4,
page 4-2.

Entering Diagnostics

1. Apply power to the unit. When the
2. Press the soft button below RUN DIAGS in the LCD.
• SDRAM Refresh
• Flash Memory
• MARA Validity Check
• MARA Communications
• Exp DIMM Check
• MIDI UART
• External Card
• MARA Delay RAM
• MARA Sound ROM
• Audio Output
the LCD, quickly press and release the Exit button. The LCD should display the following:
PC3 Boot Loader
RUN UPDATE
PC3 IMAGE
Figure 2-1 LCD example, Boot Loader
****Welcome to the Kurzweil PC3****
Version X.XX
RUN SYSTEM FILE
DIAGS RESET UTILITIES
message appears in
2-1