Locks Up, Freezes; Running System; Waking Up Scanner; V.a.s.t.' Sign Wave On Boot-Up Or Fails Sound Rom, Sound Ram Or Vlsi Diagnostic Tests - Kurzweil K2600 Series Service Manual

Troubleshooting
Power Up Problems

Locks Up, Freezes

'Running System...' or Fails VLSI/ZRAM test in diagnostics:
1. On the DSP Board, check the signal paths and supplies for the components at the
2. On the Engine Board, check buffers U8, U12, U34 through U39. These buffers are

'Waking up Scanner'

1. On the Scanner Board, check the signal paths and supplies for U3, U4, and Y1.
'V.A.S.T.' Sign Wave on boot-up or Fails Sound ROM, Sound RAM or VLSI
diagnostic tests
1. On the Engine Board, check the clock signals to the components at the following locations:
"Please Wait..." when trying to load from floppy disk:
1. On the Engine Board, check C41, C43, and U9 (Floppy Controller).
"Please Wait..." when trying to load from SCSI:
1. On the Engine Board, check the signal paths and supplies for the components at the

Fails Sound RAM Diagnostic test

On the Engine Board, check the 'Power Jumper' voltage setting.
5-10
following locations:
• Check Y1 crystal and verify that this signal is reaching the appropriate ICs.
• Verify that U1, U7, and U34 are labeled 7z04.
connected to U3, microprocessor. (These buffers often will display a 'Bus Error' code
when running the VLSI/ZRAM test in diagnostics.
• Janis ICs, U17 and U18
• ICs U21 through U24, and U28.
• Sound ROMs, U32 and U33.
following locations:
• Check U13 and U14 (SCSI controller).
• Check U15 (SCSI terminator).