Genicom MatrixPrinter LA36 - Manual (Page 125)

5-38
d. HDLSI
An internal timer is started by HDLSI after the alarm signal is received and the PWSTOP signal is output to
the power supply after counting up.
If the PWSTOP signal is output, the power supply (+34 V and +5 V circuits) is turned off to keep the SP and
LF motors from burning out.
Figure 5.38 Fire check circuits
+34V +34V +34V
SG2
Long-mode
detection
SG2 SG1 SG1
Time
constant
circuit
SG1
+5V +5V
+
-
SG1 SG1 SG1
Time
constant
circuit
Detection circuit
+5V +5V
+
-
SG1
Compare circuit
Compare circuit
Detection
circuit
HDLSI
MBCU20050
624µs
timer
SPALMS
LFALMS
SPALML
LFALML
7s timer
27s timer LS06
PWSTOP
+34V
SG1
+34V
SG2
HDALM
SPALMS
LFALMS
624µs
timer
Head
fire
check
Short-mode
detection
circuit
Motor
fire
check