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ZPB ASSEMBLY
-Before beginning assembly of the ZPB, first check that you have
all the parts listed in the parts list.
-Note that in-the following instructions, "left" and "right" refer
to those directions when viewing the component side of the PC
board with the 100-pin edge facing down.
-Using-an ohmmeter, check for open circuits between the pair
of solder pads for each of the following seven capacitor
locations: C22, C23, C25, C26, C27, C28, and C29.
If any
shorts are found, locate and correct the problem or return
the PC board for replacement.
-Insert and solder the 40-pin IC socket at location 3C,
following the procedure given in the Assembly
Infor~ation
section.
-Insert and solder the seven 20-pin IC sockets with correct
orientation.
-Z4. -Insert and solder a 16-pin IC socket at location IG.
Note
that this socket has reverse orientation from all the
others, with pin 1 in the upper right corner.
zs.
-Insert and solder the remaining thirteen 16-pin sockets with
correct orientation.
Z6. -Insert and solder the fourteen 14-pin sockets with correct
orientation.
Do not install sockets in locations 5C, 5D,
and 5E (inside dashed line) unless you are assembling the
PROM option at this time.
-~
-Insert and solder the five single-in-line (SIP) resistor
~
networks labeled RNl, RN2, RN4, RN5, and RN6 on the layout
legend.
RN6 is a 2.2K
oh~~networkand
the remaining four
are lK ohm networks.
RN3 is part of the PROM option.
Orient each SIP so the end marked with a "I" (sometimes this
end has a beveled corner) corresponds to the end marked with
a dot on the layout legend.
-Insert and solder the following sixteen resistors.
Refer to
the Assembly Information section for resistor installation
procedures.
-Resistor
V~lue
-Color-code
Location
-470 ohm
-yellow-violet-brown
IF
11
North Star Z80A PROCESSOR BOARe
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