Section 2 Specific Service Instructions - JVC KD-X120EE Service Manual

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 happen at the fuse pattern.
(2) Add following part on the fuse pattern.
(3) Check output level.
Meltdown point
2.1.3 After finished repair
Due to improper part replacement, this meltdown occurs.
Thus please notice following information when the unit is returned to your customer.
Things to be checked before installing the unit.
(1) Check the GND line of external amplifier or other equipment 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 MICROCOMPUTER'S TERMINAL DESCRIPTION
IC701 (R5S726A0D216FP) on MAIN PWB ASSY
Pin No. Pin Name
1 LCD_INH
2 DAB_COM_ON
2 NC
3 PVcc
4 DZF
5 Vss
6 PANEL_PON
7 DC_ERR2
8 PWIC_MUTE
9 LCD_CE
10 Vss
11 LCD_CLK
12 Vcc
13 RGB_CLK
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
Part Number
F53-0513-08
I/O
O Display On/Off Control
O Enable DAB micon (For DAB model)
O No Use (for non DAB model)
- Power supply for I/O circuits
I Zero Input Detect
- GND
O Supply Control to Panel
I Detect DC Clip (for ST Power Amp IC)
O Muting Output for Power Amp IC
O LCD Driver IC Chip Enable Output (for LCD Model)
- GND
O LCD CLK Output
- Power supply
O I2C Clock Output for RGB Driver (For RGB Model)
(No.MA606<Rev.002>)6/20
Part Name
PATTERN FUSE
Application
SPEC
4A
Processing/Operation/
Description
L: Display OFF/
H: Display ON
H: ON/L: OFF
L: Mute OFF/H: Mute ON
L: ON/H: OFF
L: DC Error ON/
H: DC Error OFF
L: Mute ON/H: Mute OFF