CONTENTS
Technical
Specification
Important Notes to
Service
Engineers
FD-5 Maintenance
and Alignment Information
Exploded
View 1
Exploded View 2
Circuit Board Views
Alignment
Instructions
FD-5 Control Board
Schematic Diagram
Cabinet Drawing & Parts List
CPU/Switch/Battery
P.C.B.'s
Memory/Fuse/Volume P.C.B.'s
Modem P.C.B. Component Layout
Keyboard Schematic Diagram
Chassis
Schematic Diagrams
Power
Supply Schematic Diagram
Modem Chassis
Schematic Diagrams
Electrical Parts List
Page
TECHNICAL SPECIFICATION
2
PPC640
2
•
Parallel Centronics Printer Port
3
—
11
•
Compartment for 1 Alkaline
C
Cells
to
give up to 8
hours use.
1
2
•
8086 16-bit processor, 8MHz clock.
13
•
640k Ram, 64k Video Memory.
14
•
Integrated display adaptor fully compatible
with MDA and CGA.
14
Drive either the LCD panel or an external
monitor.
1
5
•
640 x 200 pixel
supertwist
LCD
panel supports all CGA
and
1
6
MDA graphics
and text modes.
Display can
be
tilted to
6
1
7
viewing
angles and
contrast is fully adjustable to allow for
1
8,
1
9
different
lighting conditions.
20
•
Integral Modem which supports
21
V21
(300
bps)
Full Duplex
22
—
25
V23
(1
200/75bps)
26
V22
(1200
bps) Full
Duplex
27,
28
V22bis
(2400
bps) Full Duplex
29
—
31
•
Hayes Command compatible;
auto-dialling,
auto
answer
•
Includes Serial Port.
•
AC
Mains Adaptor.
•
Enhanced AT type keyboard
with
102 keys.
•
Single or Twin 720K 3
1
/2 inch
Disk Drives.
•
Microsoft MS-DOS 3.3
Operating System.
•
Mirror II Communications Software.
•
Built-in Super Twist, 640 x 200 resolution, with grey
scale
emulation; hardware
to
drive any external CGA monitor.
•
Speaker
with volume control.
•
Battery backed real time clock with
scratchpad RAM.
-^0
•
Socket for 8087 maths co-processor.
•
Socket for PPC640 expansion box (to accept
IBM compatible
expansion cards and hard disk).
•
Carrying case
with pockets for manual and disks.
•
Carrying size closed:
Length: 450mm
(1
7
3/4") excluding handle.
Depth:
230mm (9")
Height: 100mm
(4")
Weight: 5.4Kg
(1
1 3/4lb)
excluding batteries.
PPC512
•
PPC512
specification
as
PPC640 but with 51 2K Ram
and
without integral modem and
Mirror II Communications
Software,
•
Single
or Twin 720K
3
1
/2 inch Disk Drives.
IMPORTANT NOTES TO SERVICE ENGINEERS
This Service Manual gives indepth technical information on all of the circuits and the P.C.B.'s which make
up
the PPC51
2/
640.
Much
of this
data
is for information purposes only
as
the procedure engineers will follow when
servicing this equip-
ment
will often be to
exchange Printed Circuit Boards. In some instances Amstrad will insist that subassemblies
are
returned for exchange and should not be serviced by
Service Engineers.
Please take note of the following information before
attempting
to
the service the
equipment.
1
.
Full diagnostics are not specified in this manual. A
diagnostic tool, designated the R.P.5-2*, is available
from CPC and gives
certain diagnostic information on the
Computer. To carry out any
indepth
fault-finding this diagnostic
tool is necessary.
2. The Disc Drive Mechanism and accompanying
Printed Circuit
Boards should
not be serviced by Service Engineers. Exchange
mechanisms complete with P.C.B.'s are available
from Amstrad.
3. LCD Supertwist is
a
complete unit, and no
service should be
attempted on this unit
by the
field
engineers. Exchange Display
Assembly should
be
obtained from Service
Department.
4 Complete Printed Circuit Boards are
available on an exchange
basis and unless the
Service Engineer is particularly familiar
with
this product arrangements should be made to
exchange the
P.C.B.'s where
a fault has developed. The
R.P.5-2 diagnostic
referred
to
above
can be used to
ensure correct diagnosis
of the P.C.B. fault.
5.
In some instances
a second Disc Drive
will
be
fitted
to
the PPC-51 2/640.
This second Disc
Drive is subject
to
seperate service
information
but under no circumstances
should any service
work
be
carried
out
on the mechanism
or its Printed Circuit Board.
In the event of
a
fault
on the second
Disc Drive arrangements
should
be
made
to
exchange
this.
6.
Service
Engineers
carrying
out any repairs on
this unit can contact
the Customer Services
Section of Amstrad for further infor-
mation should they have
any difficulty.
The PPC51
2/640
is
a
sophisticated piece of computer technology
and service work should be undertaken on this equipment
by
suitably qualified personnel and preferably
by
appointed Amstrad Agents.
'Upgrade kit is available
to
enable full diagnosis of the said machine.
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