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Author Topic: GW Instek GW-8135 DMM repair help  (Read 993 times)

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Offline duldogTopic starter

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GW Instek GW-8135 DMM repair help
« on: October 04, 2020, 10:31:38 am »
Hi folks!

 I have acquired a defective GW Instek GW-8135 bench dmm

It has  a display but this not read anything in all settings

It has burned parts in the in the power supply section (R101, R104, Q101) and shorted Q502/Q501 which could have probable caused the power supply parts to fail (I have them replaced with J310)

D101 is heating up (just a zener voltage reference for Q101), it has D16 label which i cannot find any info (BTW it reads 2V when tested)

can you please help me identify the diode? or somebody has the same dmm can you please share some test points or diagram? thanks a lot!
« Last Edit: October 04, 2020, 10:36:22 am by duldog »
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Offline Labrat101

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Re: GW Instek GW-8135 DMM repair help
« Reply #1 on: October 04, 2020, 06:58:08 pm »
There are no service schematics as far as I know
The Link below maybe of some help

There is a tear down of the GW 8055  here
https://www.eevblog.com/forum/testgear/gw-instek-gdm-8055-multimeter-teardown/
« Last Edit: October 05, 2020, 01:52:46 pm by Labrat101 »
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Offline whipaway

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Re: GW Instek GW-8135 DMM repair help
« Reply #2 on: January 27, 2024, 01:06:13 am »
Here is the service manual for the GW Instek GW-8135 DMM.
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