Products > Test Equipment
HP 226A Time Mark Generator - Teardown Photos
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sean0118:
Hi all,

There doesn't seem to be many photos of the 226A online so thought I'd do a teardown. The service manual is available online but too large to upload here:













A1 Inverter:





A2 Trigger Generator:





A3 Clock and Low Frequency Generator:




A4 Clock and High Frequency Generator:


A8 Filter:


A5 2n Second Generator:


A6 Motherboard:


A7 Voltage Regulator (modified with extra capacitor??):


factory:

--- Quote from: sean0118 on March 16, 2024, 05:35:22 am ---Hi all,

There doesn't seem to be many photos of the 226A online so thought I'd do a teardown. The service manual is available online but too large to upload here:



A1 Inverter:



--- End quote ---

Very interesting, I've failed to take pictures of mine.
The serial number of your 226A is below 00100, it has been suggested numbers below 100 are from the prototype batch and full production started at 00100. The hand painted color stripes on the boards I've seen in prototypes before.

The board mislabelled by HP as A1 in your pictures, is actually A9 in the manual, this is option 003, the program inverter board, most do not have this. Look nearer the start of the manual for this option.

The extra capacitor, there are two chassis mounted capacitors in the manual, maybe someone decided it was easier to fit a replacement elsewhere, than try & get to those above the transformer, it looks too big to fit above the transformer anyway.

David
sean0118:

--- Quote from: factory on March 16, 2024, 12:25:22 pm ---The serial number of your 226A is below 00100, it has been suggested numbers below 100 are from the prototype batch and full production started at 00100. The hand painted color stripes on the boards I've seen in prototypes before.

--- End quote ---

Interesting! I didn't realise it was an early one, I noticed some of the boards have mods so could be a prototype.


--- Quote from: factory on March 16, 2024, 12:25:22 pm ---The board mislabelled by HP as A1 in your pictures, is actually A9 in the manual, this is option 003, the program inverter board, most do not have this. Look nearer the start of the manual for this option.

--- End quote ---

Thanks, looks like you are right and the board should be labelled A9.  :-+
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