(No.MA665<Rev.001>)6/33
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 How to repair a fuse pattern
2.1.1 Purpose of fuse pattern
In order to prevent serious damage on the circuit, fuse pattern is
prepared on the GND line of RCA Terminal. This damage may
take due to improper part replacement with a external equipment
via RCA line.
2.1.2 Repair Procedure
(1) Check the shorted circuit at the meltdown point.
Need to clean up if the shorted circuit or carbonization hap-
pen at the fuse pattern.
(2) Add following part on the fuse pattern.
(3) Check output level.
2.1.3 After finished repair
Due to improper part replacement, this meltdown occurs.
Thus please notice following information when the unit is re-
turned to your customer.
Things to be checked before installing the unit.
(1) Check the GND line of external amplifier or other equip-
ment which must connect properly.
(2) Check whether the GND line is not short-circuited with the
battery terminal. (do not short-circuit these lines)
2.2 Components description
2.2.1 MAIN PWB
2.2.2 SWITCH PWB
Part Number Part Name SPEC
F53-0513-08 PATTERN FUSE 4A
Meltdown point
Ref. No. Application / Function
Operation / Condition / Compatibility
IC161 ANALOG IC B02_EVOL
IC301 ANALOG IC B01_PWR_IC
IC540 IC A11_LSI
IC601 IC A01_TUNER
IC701 IC C01_MICON
IC821 ROM IC C02_FLASH
IC831 ANALOG IC C03_RESET
IC841 ROM IC C04_EEPROM
IC851 IC E01_LDO_1.25V
IC861 ANALOG IC E02_DC_DC
IC891 MOS IC E03_HSS
IC901 ANALOG IC E04_REGULATOR
IC941 MOS IC E07_CD3.3V
Q250 DIGI TRANSISTOR B04_PREOUT
Q260 DIGI TRANSISTOR B04_PREOUT
Q270 DIGI TRANSISTOR D07_MUTE
Q271 TRANSISTOR D07_MUTE
Q272 DIGI TRANSISTOR D07_MUTE
Q273 DIGI TRANSISTOR D07_MUTE
Q540 TRANSISTOR A11_LSI
Q701 DIGI TRANSISTOR C01_MICON
Ref. No. Application / Function
Operation / Condition / Compatibility
IC1 MOS IC K1
Q1 TRANSISTOR K1
Q51 TRANSISTOR K1_LED
Q52 TRANSISTOR K1_LED
IC90 IR DETECT UNIT K1_REMO
Q90 DIGI TRANSISTOR K1_REMO
Q91 DIGI TRANSISTOR K1_REMO
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