Sharp AM-900 Service Manual page 100

AM-900U
B
3
SYSTEM ERROR
[P3]
4
SYSTEM ERROR
[P4]
5
SYSTEM ERROR
[P5]
C
C
6
SYSTEM ERROR
[P6]
D
IC22
Thermister Error
(Regulator IC)
CNRTH (Connector)
C, R on route
of CNRTH~IC21
D13 (Diode)
Printer Control Microcomputer
IC21 (Printer CPU)
ROM/RAM Error
Fuser Temp.
Temp. detect
too High Error
Heater control Error
Temp. detect
Fuser Temp.
too Low
Error
Heater control
Error
No detect zerocross
IC21 (Printer CPU)
signal (/ZC)
of CNPW-14~IC21
5 – 27
IC21 (Printer CPU)
CNRTH (Connector)
Other parts on route
of CNRTH~ IC21
/HLON, /PWRLY signal
IC21 (Printer CPU)
CNRTH (Connector)
C, R on route
of CNRTH~IC21
/HLON, /PWRLY
signal
Safety circuit
CNPW-14pin
C, R on route
IC21 (Printer CPU)
CNPW-12pin/13pin
IC32 (driver)
R335, R336
CNPW-12pin/13pin
IC32 (driver)
IC21 (Printer CPU)
IC31 (Comparator)
R, C around above
IC31
IC25,IC29,IC33
R, C around above
ICs