Notes On Replacement Of The Sdram; Note On Insulators And Their Set Screws - Pioneer DVR-555HX-S Service Manual

5

1.3 NOTES ON REPLACEMENT OF THE SDRAM

Note when replacing the SDRAM
When replacement of the SDRAM (IC1201 or IC1221) on the MAIN Assy is required, identify the manufacturer of the SDRAM.
If the SDRAM that needs replacement was manufactured by ELPIDA, both IC1201 and IC1221 must be replaced at the same
time.
SDRAMs for service are manufactured by SAMSUNG.
How to identify the manufacturer
Confirm the name of the manufacturer stamped on the surface of the part.
By ELPIDA (replacement of both SDRAMs required)
Measures to be taken
1
If the SDRAM that needs replacement was manufactured by ELPIDA:
Replace both IC1201 and IC1221 at the same time.
2
If the SDRAM that needs replacement was manufactured by SAMSUNG:
Replacement of only the defective SDRAM (IC1201 or IC1221) is possible.
Possible malfunctions
If SDRAMs made by different manufacturers are mounted on the MAIN Assy, the following malfunctions may occur:
1
The power does not come on.
2
High-speed dubbing disabled
3
Other malfunctions related to the SDRAM

1.4 NOTE ON INSULATORS AND THEIR SET SCREWS

For compliance with the safety standards, removal of the insulators and their set screws, as shown in the figure below,
is prohibited. If they are removed, this product may not meet the official standards. NEVER remove these parts from
the product.
5
6
By SAMSUNG (replacement of only the defective SDRAM possible)
Insulator
DVR-LX60D
6
7
7
8
A
B
C
D
E
F
9
8