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Vodavi Starplus Spd 4896 Hybrid Key Telephone System Installation Manual

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    							PRODUCT NOTlCESTARPLUS DIGITAL SYSTEMS
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    							PRODUCT NORCESTARPLUS DIGITAL SYSTEMS--PN0008
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8300 E. Raintree Drive
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    							PRODUCT NOTICESTARPLUS DIGiTAL SYSTEMS
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    							PRODUCT NOTICESTAAPLUS DIGITAL SYSTEMS
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    							PRODUCT NOTICESTAAPLUS DiGiTAL SYSTEMS
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    							PRODUCT NOTlCESTAl3PLU.S DIGITAL SYSTEMS
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    							PRODUCT NOTICESTARPLUS DIGITAL SYSTEMSwPN0008
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    							OtlCESTARPLUS DIGITAL SYSTEMS
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    							PRODUCT NOTICEPNOOlO
Starplus Digital Systems
July 
18,1995Static Noise on CO Lines
AFFECTED PRODUCTS:2856 CPU (2830-00 or 2830-l 6)
SYMPTOM:There may be times when processor communication with 
a-CO board causes a low
level static noise to be present during conversation on CO lines. This condition is
caused by the timing circuit in the IC chip and was changed by the chip manufacturerduring a revision update. To resolve this condition, a new type of 
IC chip was
selected and implemented into production and repair.
RESOLUTION:After determining that externai oroblems on the CO line are not causing the noise.
the CPU card must be 
WtXNed from the system and examined. If the oid IC chop is
installed on the board, it needs to be repaired with the new 
IC. To identify iheproblem 
IC, look for U55 as shown in the attached drawing.
1.Verify that the IC is a 74HCT138 or a 74HC138. If US5 is a 74HC138 type. you can
re-install the board as the IC is correct.
2.If the chip is a 74HCT138 type. look at the date code on the CPU board. Compare
the date code against the table below to determine if the 
IC is correct. If correct. re-
install the board. If incorrect, follow standard Vodavi MRA procedures to have the
board repaired or replaced.
PROCEDURE:
U55
74HCi138
73HCT138
74HC 138DATE CODE ON PCS
4094 and above
3994 and below
ALLCORRECT
!NCORAECTIx
X
!X
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