Replacement Of Backup Memory Ic - Sony DVS-7200A Maintenance Manual

1-2-6. Replacement of Backup Memory IC

If the backup memory IC (IC39/CPU-246 board (BKDS-7015) or the CPU-263 board (BKDS-7025/7026)) 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-246/263 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-246 board or the CPU-263 board.
(4) Install a new IC in the reverse order of the procedures (1) through (3).
CPU-246 board
CN9
CN8 CN17
IC39
COP1
COP3
CN15
CN14
COP2
CN16
CN18 CN21
S5
(Component side/A side)
DVS-7200AE MMP1
CN5 CN3
CN10 CN1
CN6 CN4
CN13
S3
CN12
S2
S1
D112 D102
CN20 CN19
S4
CPU-263 board
D2
D27
D1
D26
D25
S1
D24
D23
D22
IC39
D18
D17
S2
D16
D6
S3
D7
D2
D1
D295
D8
CN21
CN18
CN9 CN10
CN17
(Component side/A side)
1-2. Control Panel
1-2-6. Replacement of Backup Memory IC
CN6
S4
CN7
CN5
COP1
COP2
CN16
CN4
S5
CN11
CN3
CN1
CN8
1-43