INTERPOLATION OSCILLATOR CRYSTAL CHART - TM-11-5820-401-34-30121

TM 11-5820-401-34-3/0967-LP-432-3060

3-12. GROSS TROUBLESHOOTING PRELIMINARY INSTRUCTIONS. (CONT)

Before proceeding with the steps given in the gross troubleshooting chats, determine whether or not

the failure to the volume control test conforms to any of the following failure modes:

CORRECTION

CAUSE

FAILURE MODE

Crystal Y2012 (5.65 MHz)

Replace A2000 assembly.

No audio on all channels

in A2000 assembly

ending in "O", (eg,

30.00,30.10,30.20, etc)

Crystal Y2011 (5.60 MHz)

Replace A2000 assembly.

No audio on all channels

in A2000 assembly

ending in "5", (eg,

30.05,30.15,30.25, etc)

Defective interpolation

Replace A2000 assembly.

No audio on the same 100-

oscillator crystal

See interpolation oscil-

kHz segment for each MHz

lator crystal chart.

of tuning

INTERPOLATION OSCILLATOR CRYSTAL CHART

The following chart is used to isolate the particular crystal responsible for audio failure in the same

100-kHz segment for each MHz of tuning. In this failure mode, if audio is absent at 30.05 and 30.10,

it will be absent at 40.05 and 40.10; 50.05 and 50.10, etc.

INTERPOLATION OSCILLATOR CRYSTAL CHART

SEGMENT OF KC CONTROL

CAUSE

WHERE AUDIO IS ABSENT

CORRECTION

Crystal

Y2007

Replace

A2000

assembly.

05 and 10

Crystal

Y2008

Replace

A2000

assembly.

15 and 20

Crystal

Y2009

Replace

A2000

assembly.

25 and 30

Crystal

Y2010

Replace

A2000

assembly.

35 and 40

Crystal

Y2005

Replace

A2000

assembly.

45 and 50

Crystal

Y2004

Replace

A2000

assembly.

55 and 60

Crystal

Y2003

Replace

A2000

assembly.

65 and 70

Crystal

Y2002

Replace

A2000

assembly.

75 and 80

Crystal

Y2001

Replace

A2000

assembly.

85 and 90

Replace

A2000

assembly.

Crystal

Y2006

95 and 100

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