Sony MHC-V83D

MHC-V83D
33
Sony CONFIDENTIAL
For Authorized Servicer
Switch Keyboard Diagnosis Flow
1.) AC In, [
1
] button no response.
2.) Power On, [TAIKO] button no response.
[
1
] / [TAIKO] button feel hard when press.
Disassemble POWER‐KEY mounted pc board from TOP PANEL ASSY SERVICE (V83D), S8450/S8452 switch keyboard feel stuck when press?
Assemble back POWER‐KEY mounted pc board from TOP PANEL ASSY SERVICE (V83D). Do [
1
] / [TAIKO] button still feel hard when press?
Switch keyboard broken. Replace switch keyboard.
No
BUTTON, POWER broken and cannot be replaced. Exchange TOP PANEL ASSY SERVICE (V83D).
[
1
] / [TAIKO] button no response when press.
Check 100543811 FLEXIBLE FLAT CABLE (5 CORE) /100543911 FLEXIBLE FLAT CABLE (25 CORE). Does it slanting/ not fully insert?
Check 100543811 FLEXIBLE FLAT CABLE (5 CORE) /100543911 FLEXIBLE FLAT CABLE (25 CORE). Does it broken/ conducting pin peel off?
Replace broken FFC(s).
Check FFC connectors (CN8450/CN5403/CN5401/CN126). Does it broken by visual check?
End
In AC cut condition & all FFC connected condition, check switch keyboard resistance. [
1
] button: CL8455 & CL8453 (GND)
[TAIKO] button: CL8454 & CL8453 (GND) Does it show reading out of the range between 12~13 kilohms ([
1
] button) /
17~18 kilohms ([TAIKO] button)?
AC cut, re‐insert FFC(s) and try again.
Replace broken mounted pc board(s).
Switch keyboard broken. Replace switch keyboard.
In AC in condition & all FFC connected, measure voltage supply on switch keyboard. [
1
] button: CL8455 & CL8453 (GND)
[TAIKO] button: CL8454 & CL8453 (GND) Does it show reading out of the range between 3.2~3.4V?
Perform “COLD RESET” by touching [
x
] and [MIC/GUITAR LEVEL +]
touch keys simultaneously for 3 seconds. Re‐check the flow.
MOTHERBOARD board IC109 broken and cannot be replaced. Exchange MOTHERBOARD mounted pc board.
In AC cut condition, press switch keyboard and check resistance. [
1
] button: CL8455 & CL8453 (GND)
[TAIKO] button: CL8454 & CL8453 (GND) *Check multimeter probe resistance (+ & ‐) and compensate to final reading. Does it show reading out of the range between 0~1 ohm?
MOTHERBOARD board IC001 broken and cannot be replaced. Exchange MOTHERBOARD mounted pc board.
No No
Yes Yes
Yes
Yes
Yes
No No No No No No No
End
Yes Yes
Yes
Yes
Yes
SYSSET
2020/06/2222:32:42(GMT+09:00)