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No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Does DISC
NAVIGATION or
STOP/CANCEL
button function?
Operation buttons on L case do not function.
TL8002 (MENU):
0V
(*1)
MENU button faulty:
Replace the L case.
*1: When MENU button is pressed.
Replace the MAN
circuit board.
Does MENU button
function?
TL8003 (SELECT):
0V
(*2)
SELECT button faulty:
Replace the L case.
*2: When SELECT button is pressed.
Does SELECT
button function?
TL8004 (KEY1): Does
the voltage vary?
(*3)
Button faulty:
Replace the L case.
Set to service position (B).
TL8006 (KEY2): Does
the voltage vary?
(*3)
Remove the L block
Replace the MAN
circuit board.
Replace the MAN
circuit board.
Replace the MAN
circuit board.
Button faulty:
Replace the L case.
*3: When the do not function button is pressed.
TL8002
AEL (A)
TL8003
AEL (A)
TL8004
AEL (A)
TL8006
AEL (A)
List of check points
Symptom
Circuit board
(side)
Location on
circuit board
Lead wire
soldered
or not
1C
Need not
1C
Need not
1C
1C
Need not
Need not
Troubleshooting > Trouble Diagnosis