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Old 19th Oct 2020, 3:33 pm   #15
tony brady
Pentode
 
Join Date: Mar 2014
Location: Peacehaven, East Sussex, UK.
Posts: 207
Default Re: Tektronix 7623A poser

Colin, did you see that C1193, C1198 & Q1195 all have a triangular symbol for ground? this goes back via pin 3 of the connector P1185, pin 3 of P1195 and pin 1 of P1180 to the power supply connector P870.

be careful that the connector P870 is correct because there is a mistake in the pdf of the manual that I Have where pins 1 & 2 both appear to be +15V unreg depending on which end you look. ( on diagram 7 pin 2 of P870 is +15V unreg whereas on diagram 8 pin 1 is shown as +15V unreg from the fuse). so check the orientation of P1180 and buzz the unreg +15V from the fuse to L1198 and the 0V from the psu to the triangle marked grounds on Q1195 etc
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