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VPP0 and VPP1 very low

ICQ：☆unknown☆

MSN：☆unknown☆

ＱＱ：☆unknown☆

home page：☆unknown☆

handsome

cosyne

register

Hello,
VP480 programmer does not program anymore.
Software: 4.2.0 (08/12/2009)

Read chips fine.
Not able to auto-detect chips
Pass all self-tests. "System Test OK!"
But when measuring programming voltages
VCC Cal. (3V) => 3.1214V
VPP0 Cal. (12V) => 6.88V
VPP1 Cal. (12V) => 6.88V
VPP0 Cal. (25V) => 6.88V
VPP1 Cal. (25V) => 6.88V　
all measured with external Power Adapter connected and showing 9.00V

Please suggest which components I should change.

[ Posted:2019-08-08 06:35:47 ]

Re:VPP0 and VPP1 very low

ICQ：☆unknown☆

MSN：☆unknown☆

ＱＱ：☆unknown☆

home page：☆unknown☆

handsome

cosyne

register

I much need help on this issue.

Thank you in advance.

[ Posted:2019-08-15 16:27:13 ]

Re:VPP0 and VPP1 very low

ICQ：☆unknown☆

MSN：☆unknown☆

ＱＱ：☆unknown☆

handsome

lxl

host

Maybe replace 220u capacitance

[ Posted:2019-08-19 12:44:15 ]

Re:VPP0 and VPP1 very low

ICQ：☆unknown☆

MSN：☆unknown☆

ＱＱ：☆unknown☆

home page：☆unknown☆

handsome

cosyne

register

I did replaced 220μF capacitance, no joy.

May I have the value of V5 , V3 and Q3 ?
May I have the schematic detail of VPP voltage generator ?
Do you have other suggestion ?

[ Posted:2020-04-04 21:19:30 ]

Re:VPP0 and VPP1 very low

ICQ：☆unknown☆

MSN：☆unknown☆

ＱＱ：☆unknown☆

home page：☆unknown☆

handsome

cosyne

register

Still need help on this.
Thank you.

[ Posted:2020-06-13 15:53:03 ]

Re:VPP0 and VPP1 very low

ICQ：☆unknown☆

MSN：☆unknown☆

ＱＱ：☆unknown☆

home page：☆unknown☆

handsome

serpy

register

i have this problem ,,, are you solve it ?

[ Posted:2020-10-15 16:48:43 ]

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