JVC KD-A11 Cassette Deck
Both channels play cassettes. The problem is that the left VU indicator does not work.
I desoldered and checked the resistor R143.
Capacitors
C 141, C142, C143, C144, C902,
C124, C126.
Diodes
DI51, DI52.
Transistors
X63,X64,X65,X66
X101, X102, X103, X104.
The tester shows that they are functional
IC901 UPC 4557C
Measured with an ohmmeter
between the pins
4 - 8 charges to 840 Ohms
2 -3 charges to 180 kOhm
5 - 6 charges to 2.4 MOhm
4 - 1 19.2 KOhm
4 - 7 19.2 KOhm
When turning on the device, the indicators should stand up for a moment. The right one does it correctly. The left one gets up, but much less than the right one.
The indicators themselves work fine. The ohmmeter shows the same result in both gauges.
I don't know what to do next.
Both channels play cassettes. The problem is that the left VU indicator does not work.
I desoldered and checked the resistor R143.
Capacitors
C 141, C142, C143, C144, C902,
C124, C126.
Diodes
DI51, DI52.
Transistors
X63,X64,X65,X66
X101, X102, X103, X104.
The tester shows that they are functional
IC901 UPC 4557C
Measured with an ohmmeter
between the pins
4 - 8 charges to 840 Ohms
2 -3 charges to 180 kOhm
5 - 6 charges to 2.4 MOhm
4 - 1 19.2 KOhm
4 - 7 19.2 KOhm
When turning on the device, the indicators should stand up for a moment. The right one does it correctly. The left one gets up, but much less than the right one.
The indicators themselves work fine. The ohmmeter shows the same result in both gauges.
I don't know what to do next.
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