MODEL 8559A

ADJUSTMENTS

SECTION V

ADJUSTMENTS

5-1. INTRODUCTION

5-2. This section describes the adjustments used to restore the HP 8559A to its peak operating condition after a repair or to compensate for changes resulting from component aging. Illustrations showing the appropriate test setups are included in the adjustment procedures. Table 5-1 lists all the adjustments by adjustment name, adjustment reference designa- tor, and by the paragraph number of the adjustment procedure. Included in the table is a brief description of the purpose of the adjustment.

5-3. Data taken during an adjustment should be recorded in the spaces provided in the procedure. Comparison of initial data with data taken during later adjustments is useful for preventative maintenance and troubleshooting.

The adjustments in this section require the HP 8559A to be removed from the display mainframe and connected through an extender cable assembly. Be very careful; the energy at some points in the instrument will, if contacted, cause personal injury. The adjustments in this section should be performed only by a skilled person who knows the hazard involved.

NOTE

Before performing any adjustments, allow 1 hour warmup time, unless 0th- enrvisenoted.

5-4. EQUIPMENT REQUIRED

5-5. Test equipment and accessories required for the adjustment procedures are listed in Table 1-3.If the listed equipment is not available, substitute

equipment may be used provided it meets the minimum specifications given in the table.

5-6. Adjustment Tools

5-7. Required service accessories, with part num- bers, are illustrated in Section I.

5-8. For adjustments that require a non-metallic tuning tool, use fiber tuning tool, HP Part Number 8710-0033 (check digit 4). When a non-metallic tuning tool is not required, you may use an ordinary small, flat-bladed screwdriver or other suitable tool. Regardless of the tool used, do not try to force any adjustment control. Slug-tuning inductors and variable capacitors, especially, are easily damaged by excessive force.

5-9. Extender Cable Installation

1WARNING I

Disconnect display mainframe line power cord before installation of extender cable assembly.

5-10. Pull out the lock knob and slide the spectrum analyzer out of the display mainframe. If side stops are installed, refer to Section I1 for removal.

5-11. Carefully slide the extender cable assembly, HP Part Number 5060-0303, into the display main- frame, aligning the metal guide plate with the slotted side rails of the mainframe. Firmly seat the extender cable assembly to ensure good contact.

5-12. Connect the opposite end of the cable to the spectrum analyzer. The plug is keyed so it will go on correctly and will not make contact upside down. Remove the orange and the yellow leads from pins 3 and 4 on the A15 board at the rear of the spectrum analyzer. Connect the corresponding leads from the extender cable assembly to these pins by means of the insulated alligator clips.