Hitachi DZ-MV580EAU Service Manual page 63

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
Ciruit Board (Side A)
TL2090 TL2085 TL2086 TL2082
TL2089 TL2091 TL2084 TL2095
MAN-H/MAN
Ciruit Board (Side B)
TL1534
TL6006
TL6010
TL6009
: Check point (TL: Test land)
: Lead wire
Fig. 4-7-5 Lead wire soldering of MAN-H/MAN
circuit board
TL0522
TL0510
TL0513
TL0515
TL0512
TL0517
TL0520(GND)
TL0521(GND)
TL0518
TL1547
TL0511
TL0504
TL1543
TL1535
Fig. 4-7-4 Service Position (B)
TL6101
TL6102
TL3715
TL7030
TL7028
: Check point (TL: Test land)
: Lead wire
Fig. 4-7-6 Lead wire soldering of AEL-H/AEL
4 - 37
LEAD
WIRES
MAN-H/MAN
CIRCUIT
BOARD
LEAD
WIRES
AEL-H/AEL
CIRCUIT
BOARD
TL3701(GND)
TL7041
AEL-H/AEL
Ciruit Board (Side B)
circuit board