[Test-Equipment] Heathkit PS-4 or IP-32 Manual

[eric lemmon]

Ron,

You're entitled to your opinion, but I have found that the wiring diagram is
often more accurate than the schematic, and that is why I prefer to use it
when troubleshooting a kit that someone else has built.  The schematic
diagram is certainly needed to follow signal paths and determine circuit
operation.  In my many years of building Heathkits- including the GR-295 and
GR-681 TV sets and many items of test equipment- I know how easy it is to
make a wiring error, even with a pictorial diagram close at hand.

I once spent a lot of time troubleshooting a Heathkit HF transceiver that
kept blowing fuses.  Several competent technicians had already checked the
wiring against the schematic diagram and had found nothing wrong.  It turned
out that the kit builder had used one pin on a tube socket as a tie point,
since the schematic diagram showed that pin as "no connection."
Unfortunately, the tube that plugged into that socket had an internal
connection to that pin that was not reflected in the schematic.  It was a
center tap for a tube filament, as I recall.  Once the wiring was changed to
agree with the wiring diagram, the radio worked perfectly.

73, Eric Lemmon WB6FLY



-----Original Message-----
From: test-equipment-bounces at mailman.qth.net
[mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of Ron
Sent: Saturday, July 6, 2013 2:21 PM
To: Discussion of Electronic Test Equipment
Subject: Re: [Test-Equipment] Heathkit PS-4 or IP-32 Manual

> ... a Heathkit PS-4 high-voltage power supply, which is electrically
identical to the IP-32 ...

... which is also identical (or almost) to the IP-17-- though not
mechanically. 


To check for assembly errors, it's actually easier to work against the
schematic, 

rather than the instruction manual. The circuit is pretty simple. 

-- Ron




>________________________________
> From: eric lemmon <wb6fly at verizon.net>
>To: 'Discussion of Electronic Test Equipment' 
><test-equipment at mailman.qth.net>
>Sent: Saturday, July 6, 2013 10:50 AM
>Subject: [Test-Equipment] Heathkit PS-4 or IP-32 Manual
> 
>
>I am trying to repair a Heathkit PS-4 high-voltage power supply, which 
>is electrically identical to the IP-32 unit.  I have the schematic 
>diagram, but I have been unable to find an assembly manual.  I did find 
>a partial manual online, comprising only 8 pages, but the complete 
>manual has at least 26 pages.  My intention is to verify that the unit 
>was properly wired by the original owner, and having the step-by-step 
>instructions will be very helpful.
>
>If any member of this list has a clean and complete original hard copy 
>of the PS-4 or IP-32 manual, I would like to borrow it for full-page 
>scanning into PDF by my local graphics house.  Your original will be 
>returned to you, along with a CD containing the PDF file.
>
>When I first tested the unit, both C4 and C6- 20 uF 450 VDC 
>electrolytics- were leaking, and C6 ruptured.  I replaced both with new 
>capacitors (at $17 a pop!) but the unit still does not work properly.  
>Major clue: The new C6 gets very hot, very quickly.  All tubes check 
>good on my TV-7A/U tester, and the four M150 silicon diodes check good.  
>I am thinking that a very high amplitude ripple will heat up a filter 
>capacitor, so my next step is to test or replace the two 70 uF 350 VDC 
>capacitors C2 and C3.  Another clue:  When the pots are preset per the 
>note on the schematic diagram, I measure +135 VDC on the cathodes of the
6L6 tubes, rather than the +40 VDC specified.
>Yes, I am using a 20,000 ohms/volt analog meter!
>
>If any reader has encountered similar problems with a Heathkit PS-4 or 
>IP-32 power supply, please respond.  Thanks!
>
>73, Eric Lemmon WB6FLY
>
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