Replacement Of Backup Memory Ic - Sony DVS-7000A Maintenance Manual

1-2. Control Panel

1-2-6. Replacement of Backup Memory IC

1-2-6. Replacement of Backup Memory IC
If the backup memory IC (IC39/CPU-263 board) is NG when the memory is checked at power-on,
replace the IC as follows. To replace the IC, be sure to use the specified IC.
Replacement Part
CPU-263 Board (IC39)
Description : M48Z35Y-70PC1 (C-MOS 256K-BIT NON-VOLATILE STATIC RAM)
Part number : 8-759-530-40
Replacement Procedures
(1) Open the panel. (Refer to the section 1-2-1.)
(2) Turn off the power switch in the control panel. (Refer to the section 1-2-2.)
(3) Remove the IC (IC39) from the IC socket on the CPU-263 board.
(4) Install a new IC in the reverse order of the procedures (1) through (3).
CPU-263 board
1-48
D2
D1
S1
IC39
S2
S3
CN21
CN18
CN9 CN10
CN17
(Component side/A side)
CN6
S4
CN7
CN5
COP1
COP2
CN16
CN4
S5
CN11
CN3
CN1
CN8
DVS-7000AE MMP1