Precautions; Adjustment - Casio KL-1500 Service Manual And Parts List

PRECAUTIONS

To prevent damage of the thermal head caused by static electricity when assembling the chassis ass'y into
the unit, the following steps must be followed;
1 : Turn the power switch off.
2 : Discharge the capacitor C5(2200µF) on the PCB Z556-1.
3 : Connect the FPC of chassis ass'y into
a connector CN4 of PCB Z556-1.
4 : Assemble the chassis ass'y.
5 : Turn the power switch on.

ADJUSTMENT

Adjustment of low battery detection circuit
To adjust the threshold voltage of the low battery detection circuit, the following steps must be followed;
1 : Apply 9V to the battery terminals.
2 : Press ON while holding down 3 keys
SET, RETURN and FUNCTION.
(Start Diagnostic Program)
3 : Press 7.(Apply the voltage Vp for printer)
4 : Apply the voltage with a power
supply so that the voltage at the
collector of Q1 is 6.2V+0.1 / -0V.
5 : Adjust a pot VR1 so that the voltage
between pin-8 of IC4 and pin-5 of
IC3 is 0 +/-0.01V.
Setting the thermal head rank
Set the thermal head rank with pads RNK1 and RNK2 on the PCB L271-1 according to the following conditions
when replacing the chassis ass'y or thermal head. The head rank is indicated on FPC as following figure-6.
Head rank A : RNK1=SHORT, RNK2=OPEN
Head rank B : RNK1=OPEN,
Head rank C : RNK1=OPEN,
Head rank D : RNK1=SHORT, RNK2=SHORT
C5
LSI1
PCB Z556-1
Multi-meter-1
6.2V+0.1/-0V
-
+
Power supply
-
Multi-meter-2
0 +/-0.01V
-
+
RNK2=SHORT
RNK2=OPEN
XXXXXXB
Head rank = B
— 4 —
CN4 FPC
Figure-4
VR1
+
9V ~ 6.5V
Figure-5
Figure-6
Chassis ass'y
Q1
8
IC4
IC3
5