Hitachi DZ-GX20A Service Manual page 65

Troubleshooting > Trouble Diagnosis
1) Connect the two flat cables of rear block to the MAN circuit board (Fig. 4-6-2).
2) Attach the MAN circuit board and rear block to the R block.
3) Use the two screws [E] to secure the MAN circuit board.
4) Connect the GSL-H/GSL-L/GSL-M and MAN circuit boards.
5) Connect the DRF-H/DRF-L/DRF-M and MAN circuit boards.
6) Use the three screws [A] to secure the rear block.
GSL-H/GSL-M/
GSL-L circuit
board
Frame
Frame
(2) Setting to service position (B)
Service position (B) is used to diagnose trouble
in the system of operation buttons on side case
L.
Perform trouble diagnosis using the check
points on MAN/MAN-M and AEL circuit
boards.
DRF-H/DRF-M/
DRF-L circuit
R block
board
5)
4)
2)
MAN
circuit
board
Fig. 4-6-2 Setting to Service Position (A)
4 - 40
Rear block
6) Screw [A]
6) Screw [A]
3)
1)
[A] M1.7×4 (Black)
[E] M1.7×3 (Silver)
MAN
circuit
board
3) Screws [E]
High-voltage
portion
AEL circuit
board
Fig. 4-6-3 Service Position (B)
6) Screw [A]