Modifications; Hardware Modifications, Pcb Revision Levels; Digital Board A 1 Revision Level Overview - Philips SCOPEMETER PM93 Service Manual

MODIFICATIONS 11 - 1
11 MODIFICATIONS
This section lists the modifications made up to production date 1 December 1992.
11.1 HARDWARE MODIFICATIONS, PCB REVISION LEVELS
The ANALOG BOARD A 1 and the DIGITAL BOARD A2 have two stickers on them which identify their
revision level. However, one of these stickers is used only in the factory to identify the revision level
of a lower assembly. This number on this revision level sticker begins with an "S".
The revision level stickers for complete DIGITAL BOARD A1 and ANALOG BOARD A2 assemblies
will be located as indicated below. All revision level descriptions refer to the complete DIGITAL
BOARD A2 and ANALOG BOARD A1 assembly. Revision levels "nn" are indicated in:
- The replaceable parts lists, Section 9; the revision level is placed in the column "revision level",
indicating that a part has been modified. The modification is described below in the revision level
overview.
- In the schematics; the revision level "nn" is placed in a circle near the modified part(s). The
modification is described below in the revision level overview.
The revision level number is printed on the left hand side of the sticker.
04
I
~~
I :: I
zzzzzzz
L
Revision Level Number
The ANALOG BOARD A 1 revision level sticker for the complete assembly is located near the A channel
input on the shield that is permanently attached to the board. You must remove the top shield to access it.
The DIGITAL BOARD A2 revision level sticker is located between the two display driver chips 01406
and 01407.
11.2 DIGITAL BOARD A 1 REVISION LEVEL OVERVIEW
REVISION LEVEL 01 DATE: 91-05-30
First release.
REVISION LEVEL 02 DATE: 91-06-06
Reason: Contrast variation LCD
ITEM FROM TO
R1421 number not listed 100E 5322 111 91893 51E1
R1408, R1414 number not listed 34E8 4822 111 91885 10E