Hitachi DZ-GX5020A K Service Manual page 57

Troubleshooting > Trouble Diagnosis
Operation buttons on L case do not function.
Remove the L block
Set to service position (B).
Yes
Does MENU button
function?
No
Yes
Does SELECT
button function?
No
Does DISC
Yes
NAVIGATION or
STOP/CANCEL
button function?
No
*3: When the do not function button is pressed.
Yes
TL7063 (KEY2): Does
(*3)
the voltage vary?
No
Button faulty:
Replace the L case.
List of check points
Circuit board
Symptom
(side)
TL7060 MAN (B)
TL7061 MAN (B)
TL7062 MAN (B)
TL7063 MAN (B)
Yes
TL7060 (MENU):
(*1)
0V
No
*1: When MENU button is pressed.
MENU button faulty:
Replace the L case.
Yes
TL7061 (SELECT):
0V (*2)
No
*2: When SELECT button is pressed.
SELECT button faulty:
Replace the L case.
Yes
TL7062 (KEY1): Does
(*3)
the voltage vary?
No
Button faulty:
Replace the L case.
Replace the MAN
circuit board.
4 - 29
Lead wire
Location on
soldered
circuit board
or not
8E Need not
8E Need not
8E Need
8E Need
Replace the MAN
circuit board.
Replace the MAN
circuit board.
Replace the MAN
circuit board.