Panasonic SJ-MR200 Service Manual page 33

Part No.
Circuit
No.
IC304 C0DBAGZ00006 DC-DC
IC401 C0GBE000003 Optical head lift
IC701 AN7635SH-E1 MIC/LINE AMP
9. Display of Self-Diagnostic Function
This model is equipped with a self-diagnosis function and shows, when necessary, the
following indication in the LCD section of the set.
"F17"---This indication appears when the Down switch fails to turn ON since the magnetic head
Function
converter / 3.5V impracticable.
/ Power IC for
magnetic head
driver control
motor drive impracticable.
fails to descend.
permits recording,
but line input does
not.
impracticable.
Symptom
Recording is
voltage of IC403
(pin 14) or (TP137)
voltage of IC501
(pin 74)
Recording is
motor drive wave
form of TP144 ~ 147
Magnetic head
(CN402 pins 1 ~ 4)
Optical input
IC601 (pins 2, 3)
input wave form
(during MIC/LINE
input time).
MIC recording is
33
Check point
Confirm the
normal and voltage
IC501 is unusual,
IC501 and switch
Confirm the
periphery.
unusual, replace
Confirm the
normal, check FPC
condition of solder
around lift motor,
nothing unusual
found, replace the
motor.
unusual, check
supplyvoltage of
and peripheral solder,
and if nothing unusual
found, replace IC401.
Make sure of
IC601 is unusual,
supply voltage of
and peripheral solder,
and if nothing unusual
found, replace IC701.
IC601 is normal,
checkIC601 and
perihperal circuit.
Result and measure
If voltage at TP137
If voltage at TP137
If drive wave
If drive wave
If input wave
If input wave