Read Sharp ER-A750 (serv.man4) Service Manual online
PWB marking
Packing case
2) Cautions to be exercised when using the RAM
PWBs with the ER-A750
When using the above-mentioned RAM PWB version (1) with the
ER-A750, it is necessary to correct the RAM access timing. Use of
the above-mentioned RAM PWB version (2) does not require the
correction of the RAM access timing. For this purpose, a hardware
jumper (JP1), designed to judge to determine whether or not to cor-
rect the RAM access timing, is located on the main PWB of the
ER-A750 (Fig. 2). Before installing an optional RAM PWB, check its
version by referring to the description given in the above-mentioned
(1) and (2) and set the jumper as shown below. (The ER-A750 has
been factory-set for 150ns access time and TP cycle inserted.)
ER-A750, it is necessary to correct the RAM access timing. Use of
the above-mentioned RAM PWB version (2) does not require the
correction of the RAM access timing. For this purpose, a hardware
jumper (JP1), designed to judge to determine whether or not to cor-
rect the RAM access timing, is located on the main PWB of the
ER-A750 (Fig. 2). Before installing an optional RAM PWB, check its
version by referring to the description given in the above-mentioned
(1) and (2) and set the jumper as shown below. (The ER-A750 has
been factory-set for 150ns access time and TP cycle inserted.)
Fig. 3 Setting of the JP1 on the main PWB of the ER-A750
(1)
Setting when the ER-03MB or the ER-04MB is not marked with
"
"
|
"
(Position to which the ER-A750 has been factory-set)
(2)
Setting when the ER-03MB or the ER-04MB is marked with "
|
"
(ER-03MB/04MB PWB Face side)
Imprint " " on this white area.
CE
Imprint " " on the right side of the
model rabel.
model rabel.
Indivi dual case
E
C
Imprint " " under the model label.
Colleclive case
E
C
B
3
2
1
MAIN PWB
+C
17
Q6
IC
27
1
3
JP1
ZD
4
1
IC
16
Short position
IN case of (1)
IN case of (2)
1
3
1
3
3 – 3
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