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8. SERVICE CAUTIONS
8-1. Cautions in exchanging the printer unit
Inorder
to prevent print density variation caused
thermal head resistance variation, the printhead is classified
into three ranks of A, B, and C, and the rank is indicated
on the reverse side of the printer unit F.P .C. After exchange
of the printer unit, relevant circuit change must be observed
in accordance with the procedure mentioned below.
Short JA when the rank A printer is used.
Leave all open when the rank B printer is used.
Short JC when the rank C printer is used.
8-2. Threading lead wires
o
• 'o'e sure to observe the following cautions in installing
lead wire.
* 1,* 2: The lead wire A most be threaded under the
cotton wire and fixed on the F.P.C. using the
adhesive tape.
*3:
The lead wire B should be fixed with the adhesive
tape along the rib of the bottom cabinet,
8-3.
~
Installing PWB
(1) Set the lead wire to the given location of the ~
and solder it.
(2) As shown in the figure, apply the double tack adhesive
tape over the CPU (UP07506G) on the
@J
set the
PWB over it with the hole facing the relay.
(3) After the installation of the
@]
wire to the
8-4. Connecting
As shown in the figure, fix the 13-pin F.P .C. with the
cotton wire. The cotton wire also has to be soldered in a
same manner as the F.P.C.
Laad wire A
@
0
PWB, then
@]
PWB, sold er the lead
PWB.
~
with [[]
After the above procedure, adjust by me ans of the 20-
Kohms protentiometer
by
obtained. The circuit has been so designed as to attain the
best result with the potentiometer
Therefore, existence of a remarkable print density variation
might involve the following problems:
1. Drop in head performance
2. Ouality change in the thermal recording paper
3. Throuble in the thermal control circuit
*4:
00 not allow the strayed lead wire and solder to
extend out of the Ni-Cd battery terminal to the
printer unit, when the 'lead wire is being soldered
to the NiCd battery terminal.
Unless lead wires A and Bare threaded properly, it ma y )
cause to recharge the dry battery (UM3 or AA) because
of slack lead wires, when the AC adaptor is used with
(
dry batteries in installation.
PWB
-5-
Do not sale !
C E 126P
so that an optimum print quality is
set at its midway.
.
F.P.C. 13
pin
(Hold the midway part)
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