7-3
g. If ending troubleshooting procedures at this point, disconnect power from HP 5517B Laser Head, set all test
jumpers to their left-most (normal) positions, return TEST-NORM switch A1S2 to NORM, and replace laser head
front panel and side covers.
Paragraph 8-144. Subtracting Sample and Hold Troubleshooting
Add "Bypass high-voltage interlock by setting A1S2 to TEST." to the beginning of step a.
Replace step r with the following:
r. If ending troubleshooting procedures at this point, disconnect power from HP 5517B Laser Head, set all test
jumpers to their left-most (normal) positions, return TEST-NORM switch A1S2 to NORM, and replace laser head
front panel and side covers.
Paragraph 8-145. Power Amplifier Troubleshooting.
Add "Bypass high-voltage interlock by setting A1S2 to TEST." to the beginning of step a.
Replace step n with the following:
n. If ending troubleshooting procedures at this point, disconnect power from HP 5517B Laser Head, set all test
jumpers to their left-most (normal) positions, return TEST-NORM switch A1S2 to NORM, and replace laser head
front panel and side covers.
Paragraph 8-147. Warm-Up Error Amplifier Troubleshooting
Add "Bypass high-voltage interlock by setting A1S2 to TEST." to the beginning of step a.
Replace step j with the following:
j. If ending troubleshooting procedures at this point, disconnect power from HP 5517B Laser Head, set all test
jumpers to their left-most (normal) positions, return TEST-NORM switch A1S2 to NORM, and replace laser head
front panel and side covers.
Paragraph 8-150. Reference Receiver Troubleshooting
Replace step a with the following:
a. With power disconnected from the Hp 5517B, Set the TEST-NORM switch to TEST, the -REF ON jumper to LO,
and HTR OK jumper to HI. Apply power to HP 5517B. Does the READY LED eventually start blinking then remain
on continuously? If no, see HP 5517B Trouble Isolation Procedure, paragraph 8-74 and procedures recommended
therein.
Replace step f with the following:
f. If ending troubleshooting procedures at this point, disconnect power from HP 5517B Laser Head, set all test
jumpers to their left-most (normal) positions, return TEST-NORM switch A1S2 to NORM, and replace laser head
front panel and side covers.
CHANGE 3
A1 Connector Boards below Date Code 90363 have a jumper wire replacing SI and S2, near C4.
A1 Connector Boards Date Code 90363 and above have a zero-ohm resistor, part number 8159-0005
instead of the jumper wire.
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