• Code: 825
• Description: Self-diagnostic Error: Optional NVRAM
  The resident non-volatile RAM returned an error during the self-diagnostic test.
• Causes: • Replace the optional NVRAM (user account enhancement unit) on the controller board • Replace the controller board

• Code: 826
• Description: Self-diagnostic Error: NVRAM/Optional NVRAM
  The NVRAM or optional NVRAM returned an error during the self-diagnostic test.
• Causes: Replace the NVRAM on the controller board

• Code: 827
• Description: Self-diagnostic Error: RAM
  The resident RAM returned a verify error during the self-diagnostic test.
• Causes: Download controller firmware again

• Code: 828
• Description: Self-diagnostic Error: ROM
  The resident read-only memory returned an error during the self-diagnostic test.
• Causes: • Controller board defective • Download controller firmware again

• Code: 829
• Description: Self-diagnostic Error: Optional RAM
  The optional RAM returned an error during the self-diagnostic test.
• Causes: • Replace the optional memory board • Controller board defective

• Code: 835
• Description: Self-Diagnostic Error: Parallel Interface
  Loopback test error.
• Causes: • Loopback connector not detected • IEEE1284 connector defective • Controller board defective

• Code: 836
• Description: Self-diagnostic Error: Resident Font ROM
  The resident font ROM returned an error during the self-diagnostic test.
• Causes: Replace the controller board

• Code: 837
• Description: Self-diagnostic Error: Optional Font ROM
  The optional font ROM returned an error during the self-diagnostic test.
• Causes: Replace the controller board