Troubleshooting > Trouble Diagnosis

(2) Setting to service position (B)

Service position (B) is mainly used for trouble diagnosis of the video and audio signal systems.

Perform trouble diagnosis using the check points on MAN-H/MAN and AEL-H/AEL circuit

Remove the MAN-H/MAN and AEL-H/AEL circuit boards in advance, referring to “5 Disassembly and Reassembly”.

1)Solder a lead wire of approx. 10 cm to the check points (except for IC pins) on side A/B of MAN-H/MAN circuit board and side B of AEL-H/AEL circuit board, referring to “4-7-1 Trouble diagnosis table” and “C-1 MAN-H/ MAN” and “C-2 AEL-H/AEL” circuit board diagrams. (See Figs. 4-7-5, 4-7-6)

MAN-H/MAN

TL0522

TL0510

Ciruit Board (Side A)

 

 

TL0513

 

 

TL0515

TL2090 TL2085 TL2086 TL2082

TL0512

TL2089 TL2091 TL2084 TL2095

TL0517

 

 

MAN-H/MAN

 

 

TL0520(GND)

Ciruit Board (Side B)

 

TL0521(GND)

 

TL0518

 

 

 

 

 

 

 

 

TL0504 TL0511TL1547

 

 

TL1534

TL1543

TL6006

 

 

TL1535

TL6010

 

 

 

TL6009

 

 

 

: Check point (TL: Test land) : Lead wire

Fig. 4-7-5 Lead wire soldering of MAN-H/MAN

circuit board

LEAD

WIRES

MAN-H/MAN

CIRCUIT

BOARD

LEAD

AEL-H/AEL WIRES

CIRCUIT

BOARD

Fig. 4-7-4 Service Position (B)

TL6101TL3701(GND)

TL6102 TL7041

TL3715

AEL-H/AEL

TL7030

TL7028 Ciruit Board (Side B)

:Check point (TL: Test land)

:Lead wire

Fig. 4-7-6 Lead wire soldering of AEL-H/AEL

circuit board

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Image 63
Hitachi service manual Setting to service position B, TL7028 Ciruit Board Side B
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