¿ªÔÆÌåÓýAnother plastic-disk finger contact symptom and cause.? This is the disk on the back of the step attenuator. ? SYMPTOM: Intermittent: LEVEL mode meter reads zero, RF still output. CAUSE: A1A1S1 Meter Atten Sw (pins 5/6/16) contact broke loose.? See SS13. ACTION: Reattach with JB Weld.? Also blob up the other two contacts that haven¡¯t broken yet. NOTE: Do not need to remove A1A1.? Unmount pot using mini-ratchet and #1 Phillips bit. NOTE: Inner contact kills RF and meter.? Outer contact goofs up meter range annunciators when meter is in LEVEL mode, probably lights 0-3 regardless of attenuator. ? JFYI Dave Wise ? PS: Here are titles and URLs of some threads discussing this. ? HP8640B Gear Repair - /g/HP-Agilent-Keysight-equipment/topic/24788359 8565A in process - /g/HP-Agilent-Keysight-equipment/topic/24800901 HP 8558 Missing contact fingers ?- /g/HP-Agilent-Keysight-equipment/topic/24811643 Need Advice on Repairing 8640B Switch Contacts - /g/HP-Agilent-Keysight-equipment/topic/24814127 HP 8640B range switch fingers and late manual - /g/HP-Agilent-Keysight-equipment/topic/24815391 Wanting to buy rotor switch contact fingers that fall off in vintage HP Spectrum Analyzers ?- /g/HP-Agilent-Keysight-equipment/topic/24815512 spectrum HP 8558b good but missing part ?- /g/HP-Agilent-Keysight-equipment/topic/33132015 HP 8558B spectrum analyzer plug-in rotary switch - /g/HP-Agilent-Keysight-equipment/topic/29340855 ? From: [email protected] <[email protected]>
On Behalf Of nigel adams via groups.io
Sent: Saturday, May 28, 2022 2:05 PM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] HP8640B no rf out ? A very similar style of these ¡®finger¡¯ contact is found in the 8011/12/13 pulse generators which can be found quite cheaply¡. How do i know¡ just repaired one¡ works lovely.
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