Service manual
8
Ribbon check
JP1:
PIN 1
VCC
5 V
PIN 2
INP
High resp. Low
PIN 3
VSS
~ 1,2 V
PIN 4
GND
0V
The photocell "ribbon-check" is checking if there is ribbon for printing. If ribbon has been properly
loaded the photocell is sending a "Low"-signal; if there is no ribbon a "High"-signal.
The "INP"-level can be displayed in the menu item "Parameter of the photocell" under "transfer ribbon
photocell" (Hi or Lo)
(see chapter "2.5.4. Monitor").
2.1.4. Clock-signals
check point
description
value
U12
PIN 78
CLK
CPU
PIN 79
CLK
CPU
20MHz
U5
PIN 6
RESET
0V
PIN 8
RESET\
~ 5V
U5
PIN 4
NMI
0V