Initialization Problems - Samsung SRP-275 Service Manual

7-2-1 Initialization problems

Problem
Output voltage of internal AC adaptor
or PCB-main ass'y failure (Abnormal
regulator circuit)
PCB-main ass'y failure
Printer does
(Abnormal regulator circuit)
not operate
PCB-main ass'y failure
at all
(Abnormal CPU clock generator circuit)
PCB-main ass'y failure
(Program ROM selection failure)
PCB-main ass'y failure
(RAM selection failure)
Excessive belt tension
Wire break or bad solder point between
connector and HF motor terminals
Carriage
Wire disconnect between HF motor
vibrates,
connector and PCB-head ass'y
emits an
unusual
FPC(30pin) is failure or disconnected
sound, and
between PCB-head ass'y and PCB-
causes an
main ass'y
error state at
Defective HF motor
power on
Home position sensor failure
Carriage
head ass'y Wear, damage, or contamination of
first moves carriage drive gears
normally, but
then hits the
Ribbon cassette's abnormal operation B
left side of
the print
frame,
Head is bumped against Bracket-
making an
head-cover-L/R
unusual
sound
PCB-main ass'y failure
(HF motor drive signal failure)
Wire break or bad solder point between
HF motor
connector and HF motor terminals
does not
operate at all
when power
Defective power input to HF motor
is turned on,
and causes
an error state
FPC(30pin) is failure or disconnected
between PCB-head ass'y and PCB-
main ass'y
HF motor failure
FPC(16pin) is failure or disconnected
between PCB-connector sub ass'y
and PCB-main ass'y
Auto cutter
does not
Incorrect DIP S/W setting
operate at all
Auto cutter home position sensor
failure
Rev. 2.00
Probable Cause Level Checkpoint
Check 24V input voltage at J11
and output voltage
B
+5V(C55)/24V control circuit and
fuse(FU1)
Check voltage level at RESET
B terminal (pin 129) of CPU, U1
(4.75~5.25V)
B Check clock generator (U10)
B Check input at pin 26 of IC(U12)
Check input at pin 14,30,31 of
B
IC(U15)
Check Lever-tension ass'y If it
A
is assembled properly
Check continuity
B respective terminals
Check solder condition
B Check connected condition
Check for connected condition
B of FPC and FPC
failure
Check if motor operation is
B
proper without load
Use an oscilloscope to check the
sensor output signal
B
Carriage head ass'y passes the
sensor
Check gears for
A
damage
Check for dirt deposits or other
A
foreign matter
Check for rotated load of ribbon
cassette knob
Check if Bracket-head-cover-
B
L/R is slanted to the inside
Check input signal to HF motor
B drive terminal of J3 with an
oscilloscope
Check continuity
B
respective terminals
B Check the solder condition
Check the input voltage (24V
between
±2V)
B
terminals of the connector using
a DVM or oscilloscope
Check the connected condition
B
of FPC and FPC failure
Above six checks have been
B
passed
Check the connected condition
B
of FPC and FPC failure
Check the DIP Switch 1-3 setting
A
is ON
Use an oscilloscope to check the
B sensor output signal when cutter
blade passes the sensor
- 124 -
SRP-275
Action
Replace external
of DC
Power supply unit or PCB-
main ass'y or fuse
Replace
PCB-main ass'y
Replace
PCB-main ass'y
Replace
PCB-main ass'y
Replace
PCB-main ass'y
Reassemble
Lever-tension ass'y
between
Replace the terminal
Resolder as required
Make sure the connection
Make sure the connection
and replace the FPC
Replace the HF motor, if is
does not rotate properly
Replace
when
PCB-head ass'y
wear and Replace any
gears
Remove any dirt deposits
or foreign matter
Replace
Ribbon cassette
Make it vertically
Replace
PCB-main ass'y
between
Replace the terminal
Resolder as required
the motor Inspect and repair
adaptor circuit
Make sure the connection
and replace FPC
Replace HF motor
Make sure the connection
and replace FPC
Correct DIP Switch 1-3
setting
Replace
PCB-AC ass'y
damaged
AC