Troubleshooting For Rotary Encoder Test Error - Sony HKDV-900 Maintenance Manual

2-3. Troubleshooting

2-3-10. Troubleshooting for Rotary Encoder Test Error

The display of LEDs does not change even if rotary encoder is rotated
Are harness connections among
CN402 (G-3) through CN409 (J-3) on
the CP-364 board proper?
OK
Are encoder signals present to the input
side of IC303 (H-3), IC304 (H-3),
IC306 (G-3) and IC307 (G-3) on the
CP-364 board?
OK
Is inverted signal of encoder present to
the output side of IC303, IC304, IC306
and IC307 on the CP-364 board?
OK
Is inverted signal of encoder present to
the input side of IC200 (G-1) on the
CP-364 board?
OK
IC defect of IC200 or soldering defect
2-20 (E)
NG
Connect harness connectors properly
and re-test
NG
Connection defect of CN402 to CN409,
IC303, IC304, IC306 and IC307, or
encoder defect
NG
Parts defect of IC303, IC304, IC306 and
IC307, or soldering defect
NG
Disconnection of the line, or soldering
short
HKDV-900