Man Circuit Board And Rear Block [Dz-Gx20A/Mv780A/Mv730A] - Hitachi DZ-GX20A Service Manual

Disassembly and Reassembly > Disassembly
(10) MAN Circuit Board and Rear Block
Information:
Before replacing the MAN circuit board, refer to "4-9-2
EEPROM data backup and write".
1) Remove the hand strap (c) from R case (d).
2) Remove the three screws [A].
3) Remove the DRF-H/DRF-L/DRF-M circuit board (e) from
MAN circuit board (a) in the direction of the arrow.]
4) Remove the GSL-H/GSL-L/GSL-M circuit board (f) from
MAN circuit board in the direction of the arrow.
5) Remove the two screws [E].
6) Remove the MAN circuit board (a) and rear block (b)
separately in the directions of the arrows: It may be
difficult to remove the MAN circuit board, since the heat
sink rubbers (g) of board will stick to the frame.
7) Disconnect the two flat cables.
Note:
Do not scratch the surface of IC4003, which is a silicone
substrate (silicone wafer) made of semiconductor:
Scratching it could cause a fault.
Caution during disassembly and reassembly:
Be sure to paste the two heat sink rubbers to the MAN
circuit board: Neglecting this could cause a fault.
(a) MAN circuit board
(b) Rear block
(c) hand strap
(d) R case
(e) DRF-H/DRF-M/DRF-L
circuit board
(f) GSL-H/GSL-M/GSL-L
circuit board
(g) Heat sink rubbers
(h) Frame
(d)
[DZ-GX20A/MV780A/MV730A]
(e)
(f)
4)
(h)
(h)
(a)
Fig. 5-3-10
5 - 10
2) [A]
2) [A]
2) [A]
Right side
(g)
IC4002
IC4003
Positions of heat sink rubbers and IC4003
2) [A]
(c)
2) [A]
3)
1)
(a)
6)
5) [E]
1)
(b)
MAN circuit
board
IC1301
IC2006
IC4005
IC4004
(b)
2) [A]
6)
7)
[A] M1.7×4 (Black)
[E] M1.7×3 (Silver)