Troubleshooting For Test Selection Error - Sony HKDV-900 Maintenance Manual

2-3. Troubleshooting

2-3-2. Troubleshooting for Test Selection Error

Cannot change the test item number even if [+]
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
Cannot execute the test item even if the "STORE" button is pressed
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 at pin 38 of IC311 (G-3) on
the CP-364 board proper?
OK
IC311 defect on the CP-364 board or
soldering defect
Cannot quit the test mode even if the "CANCEL" button is pressed
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 at pin 36 of IC311 (G-3) on
the CP-364 board proper?
OK
IC311 defect on the CP-364 board or
soldering defect
2-12 (E)
[+] [+] [+] [+]/[_] [_] [_] [_] button is pressed [_]
NG
Connect harness connector properly and
recheck them
Contact defect of [+]/[_] botton switch
+5 V
S114 or S117 (B-1/CP-365)
Short-circuit of [+]/[_] botton switch
GND
S114 or S117 (B-1/CP-365)
NG
Connect harness connectors properly and
recheck them
+5 V
Contact defect of "STORE" button switch
S102 (B-1/CP-365)
GND
Short-circuit of "STORE" button switch
S102 (B-1/CP-365)
NG
Connect harness connectors properly and
recheck them
Contact defect of "CNACEL" button switch
+5 V
S110 (B-1/CP-365)
GND
Short-circuit of "CANCEL" button switch
S110 (B-1/CP-365)
HKDV-900