Troubleshooting For Rom Version Display Error; Troubleshooting For Rom Test Error; Troubleshooting For Ram Test Error - Sony HKDV-900 Maintenance Manual

The counter display changes without button operation
Is the harness between CN401 (A-3) on the
CP-364 and CN2 (A-1 : B side) on the CP-365
boards properly connected?
OK
Is input signal of IC311 (G-3) (pin 35 : +,
pin 33 : _) on the CP-364 board proper?
OK
IC311 defect on the CP-364 board or
soldering defect

2-3-3. Troubleshooting for ROM Version Display Error

The display of version is not correct
Replace ROM and recheck it
NG
Address bus short or data bus short

2-3-4. Troubleshooting for ROM Test Error

Error display
Replace ROM and reckeck it
NG
Address bus shot or data bus short

2-3-5. Troubleshooting for RAM Test Error

Error display
Replace RAM and recheck it
NG
Address bus short or data bus short
HKDV-900
NG
Connect harness connectors properly and
recheck them
+5 V and GND are repeated
[+]/[_] switch S114 or S117 (B-1/CP-365)
defect or harness disconnection
2-3. Troubleshooting
2-13 (E)