6
2. BLOCK DIAGRAM OF PRIMARY SIDE OF POWERUNIT
THERMOSTAT
HEATROLLER
(REMEDIAL)
t˚
THERMISTOR
(to DRIVE PWB)
THERMOSTAT
HEATROLLER
(RETRANSFER)
t˚
THERMISTOR
(to DRIVE PWB)
POWER
SUPPLY
UNIT
N(AC IN)
L(
AC IN)
SSR2N
SSR2L
SSR1N
SSR1L
CN3
VTH
CN1
5V
12V
CN2
24V
CN8
24V_RC
CN4
CONTROL
SIGNAL
N(AC OUT)
L(
AC OUT)
(to
ANALOG POWER PWB)
FAIL SIGNAL
(to DRIVE PWB)
HEATER PROTECTOR PWB
POWER
SWITCH
CN1
CN2
A
C
VOLTAGE
DETECT
PHOTO
COUPLER
ABNORMAL
CURRENT
DETECT
PHOTO
COUPLER
Primary
Secondary
SSR1L
SSR2L
ON/OFF
CN5
SSR
CN7
CN6
SSR