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Adjustments
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5-10 SEARCH & LOCK ASSEMBLY ADJUSTMENTS
Set up the centre frequency of the 1.62 MHz and 32.4MHz Oscillators.
DESCRIPTION
The centre frequencies are set up using an internal test routine.
EQUIPMENT
No external test equipment is required for this adjustment.
PROCEDURE
1, Remove the Input Module from the instrument.
2. Switch on the equipment and allow to warm up for 30 minutes.
Note: Since the Input Module is not installed in the mainframe, the HP 8508A will display the error
message "Err 601". This reading should be ignored.
3. Remove the HP 8508A top cover to allow access to the adjustments.
4, Select [PRESET] [SHIFT] [POWER MEAS} to put the instrument into the 'setup' mode
The Display will now indicate which setup code is being used. It will appear as:
tSt nonn
tSt indicates that the instrument is in the 'setup' mode and 'nnnn' is the current setup code.
Use the UP/DOWN 'Arrow' keys to set up test code '0' in Display 2.
Press [HOLD VALUE} and check that the indicator LED is ON. _
5. Adjust A4R89 slowly until the UNLOCK light extinguishes.
Note: The green LED (CR6), across the board from A4R839, is functionally the same as the UNLOCK light
on the front panel.
_ 6, Press [HOLD VALUE] to cancel the function.
7. Use the UP/DOWN 'Arrow' keys to set up test code °2' in Display 2.
Press [HOLD VALUE] and check that the indicator LED is ON.
8. Adjust the core of A4L3 slowly until the UNLOCK light extinguishes.
9. Press [HOLD VALUE] to cancel the function.
10. Replace the HP 8508A top cover.
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