Hitachi VT-FX440E Service Manual page 21

Audio problem 3 (No recording Hi-Fi Audio (with VT-FX440E(UK), VT-FX540E(UK))
RF-INPUT
Check SIF signal at pin
2 of CN701.
OK
Check Audio signal at
pin 4 and 5 of CN701 or
pin 4 and 50 of IC451.
OK
Check signal at pin 26 of IC451.
OK
Cleaning the Video Head. (See page 3-7.) Or check Cylinder Assembly and service it if detective.
LINE INPUT (AV2)
Check Audio signal at pin 10 and 56 of IC451.
OK
Check signal at pin 26 of IC451.
OK
Cleaning the Video Head. (See page 3-7.) Or check Cylinder Assembly and service it if detective.
Audio problem 4 (No playback Hi-Fi Audio (with VT-FX440E(UK), VT-FX540E(UK))
(RF OUTPUT/AV1)
Check signal at pin 24 and 27 of IC451.
OK
Cleaning the Video Head. (See
page 3-7.) Or check Cylinder
Assembly and service it if detective.
Check Audio signal at pin72,
pin74 and pin 76 of IC451.
OK
Check TU701 and A-OUT jack, and service it if detective.
No
good
Check TU701 and
service it if detective.
No
good
Check AFV PCB and
service it if detective.
No good
No
good
Check IC451 and
service it if detective.
LINE INPUT (AV1)
Check Audio signal at
pin 6 and pin 52 of IC451.
OK
Check signal at pin 26 of IC451.
No good
No good
Check IC451 and
service it if detective.
No good
Check AV cable, JK102 and line between JK102 and
pin (10, 56) of IC451, and service it if detective.
No good
Check IC451 and service it if detective.
(AV2)
Check signal at pin 24 and pin 27 of IC451.
OK
Check Audio signal at pin
65 and pin 67 of IC451.
OK
Check A-OUT jack and service it if detective.
3-4
No
good
Check A/V cable, JK101
and line between JK101
and pin (6, 52) of IC451,
and service it if detective.
OK
No good
Cleaning the Video Head. (See
page 3-7.) Or check Cylinder
Assembly and service it if detective.
No
good
Check IC451 and
service it if detective.