----SHARP----
SERVICE MANUAL
CE-155
WWW.
PC-1500
.INFO
SHARP CORPORATION
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MODEL
CE-155
8KB RAM MODULE
(PC-1500 OPTION)
File this manual into the sen·icc manual .. PC-1500 & OPTl0:-1 ..
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1. Outline
It is the option 8KB RAM that can be 11sed for the PC· I SOO.
2. RAM address
Chip select signal
3800
RAM I
From Y 7 (7-pin) of TC40H138 .
13800 - 3FFF)
4000
On PC·I SOO
4800
RAM2
SI Cfrom PC·1 500)
RAM3
S2 !from PC·! 500)
RAM4
S3 (from PC-1 500)
5000
5800
SFFF
3 . Circuit description
RAMI chip sefoct
TC40Hl38
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ADl3
8
YO
1
ADt 1
c
Yi
G2A
Y2
G2B
Y3
YO
ACL
DMEO
Y4
Y5
GNO
The RAM 1 is selected with a low state of Y7 which is
issued when all of A, B, and C, are ltigl1 with high state of
GI and low st:lle of decoder IC (TC40 Hl 38) gate inputs,
G2A and G2ll.
In othe• words, the RAMI Chip Select (CS) turns low state
to select the RAMI in the following conditions:
YO, ACL: low
DMEO, ADI!. AD12, ADl3 : high
The signal ACL, however, is the RAM contents protective
signal an the time of power-on.
Y6
To R At\11 chip select
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4. CIRCUIT DIAGRAM
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5. PARTS & SIGNALS POSITION
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6. PARTS LIST & GUIDE
PARTS COOE
DESCRI P T I O N
1 GCA BA2637CCZZ 8011 orn cabinel
2 GCAB82638CCZZ ·r 01) cabinet
3 GCASP l 078CCZZ M OOulf~ case
4
GFTAUl243CCZZ M odvle case cover
5 PCUSU I I 76CCZZ C vshion
6 PH0G - 1092CCZZ Short rubbcf
7 TCAUH I I 79CCZZ Caution label
8 1 TLABZl642CC ZZ Modul~ lab()!
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g SPAKC7002CCZZ Pack1n9 ('..ase
10
DUNT K6669CCZZ P WB unit
VH ; HM6 11 6 // -I j LS;
VHi TC40 Hl3 8FN .c
RC- SZ l0 03CCNA CapacilO(
RH - DZIOOBCCNI Doodc
VRS- TP280 104J Resistor
TiN SM3546CCZZ J I ns1 n;ct ion book
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