Service manual

Rev. 2.00
- 124 -
SRP-275
7-2-1 Initialization problems
Problem Probable Cause Level Checkpoint Action
Output voltage of internal AC adaptor
or PCB-main ass’y failure (Abnormal
regulator circuit)
B
Check 24V input voltage at J11
and output voltage of DC
+5V(C55)/24V control circuit and
fuse(FU1)
Replace external
Power supply unit or PCB-
main ass’y or fuse
PCB-main ass’y failure
(Abnormal regulator circuit)
B
Check voltage level at RESET
terminal (pin 129) of CPU, U1
(4.75~5.25V)
Replace
PCB-main ass’y
PCB-main ass’y failure
(Abnormal CPU clock generator circuit)
B
Check clock generator (U10)
Replace
PCB-main ass’y
PCB-main ass’y failure
(Program ROM selection failure)
B
Check input at pin 26 of IC(U12)
Replace
PCB-main ass’y
Printer does
not operate
at all
PCB-main ass’y failure
(RAM selection failure)
B
Check input at pin 14,30,31 of
IC(U15)
Replace
PCB-main ass’y
Excessive belt tension A
Check Lever-tension ass’y If it
is assembled properly
Reassemble
Lever-tension
ass’y
Check continuity between
respective terminals
Replace the terminal Wire break or bad solder point between
connector and HF motor terminals
B
Check solder condition Resolder as required
Wire disconnect between HF motor
connector and PCB-head ass’y
B Check connected condition Make sure the connection
FPC(30pin) is failure or disconnected
between PCB-head ass’y and PCB-
main ass’y
B
Check for connected condition
of FPC and FPC
failure
Make sure the connection
and replace the FPC
Defective HF motor B
Check if motor operation is
proper without load
Replace the HF motor, if is
does not rotate properly
Carriage
vibrates,
emits an
unusual
sound, and
causes an
error state at
power on
Home position sensor failure B
Use an oscilloscope to check the
sensor output signal when
Carriage head ass’y passes the
sensor
Replace
PCB-head ass’y
A
Check gears for wear and
damage
Replace any damaged
gears
Wear, damage, or contamination of
carriage drive gears
A
Check for dirt deposits or other
foreign matter
Remove any dirt deposits
or foreign matter
Ribbon cassette’s abnormal operation
B
Check for rotated load of ribbon
cassette knob
Replace
Ribbon cassette
Carriage
head ass’y
first moves
normally, but
then hits the
left side of
the print
frame,
making an
unusual
sound
Head is bumped against Bracket-
head-cover-L/R
B
Check if Bracket-head-cover-
L/R is slanted to the inside
Make it vertically
PCB-main ass’y failure
(HF motor drive signal failure)
B
Check input signal to HF motor
drive terminal of J3 with an
oscilloscope
Replace
PCB-main ass’y
B
Check continuity between
respective terminals
Replace the terminal Wire break or bad solder point between
connector and HF motor terminals
B Check the solder condition Resolder as required
Defective power input to HF motor B
Check the input voltage (24V
±2V) between the motor
terminals of the connector using
a DVM or oscilloscope
Inspect and repair
A
C
adaptor circuit
FPC(30pin) is failure or disconnected
between PCB-head ass’y and PCB-
main ass’y
B
Check the connected condition
of FPC and FPC failure
Make sure the connection
and replace FPC
HF motor
does not
operate at all
when power
is turned on,
and causes
an error state
HF motor failure
B
Above six checks have been
passed
Replace HF motor
FPC(16pin) is failure or disconnected
between PCB-connector sub ass’y
and PCB-main ass’y
B
Check the connected condition
of FPC and FPC failure
Make sure the connection
and replace FPC
Incorrect DIP S/W setting A
Check the DIP Switch 1-3 setting
is ON
Correct DIP Switch 1-3
setting
Auto cutter
does not
operate at all
Auto cutter home position sensor
failure
B
Use an oscilloscope to check the
sensor output signal when cutter
blade passes the sensor
Replace
PCB-AC ass’y