PART I. KSU INSTALLATION

1GENERAL

1.00This chapter provides the instructions nec- essary to mount both the STRATA DK16 Base Key Service Unit and the Expansion Key Service Unit. Instructions are also provided on how to test, remove, and replace the power supply and base unit CO line interface subassembly.

2KEY SERVICE UNIT MOUNTING

2.00Mounting Surface Considerations

2.01The Base Key Service Unit and the optional Expansion Key Service Unit are both designed to be mounted on a wall or other vertical surface. It is recommended to use Method 1 or 2 in Figure 5-2 (see Note).

NOTE:

If mounting the KSU directly to a wall, be sure to align screws with studs behind the wall; if using a hard board between the KSU and the wall, install screws first to the hard board, and then secure the hard board to the wall, mak- ing certain that screws are aligned with studs.

2.10 Mounting Preparation

1)Loosen the screws on the front cover and the side cover of the Base Key Service Unit, and remove the covers (Figure 5-1).

2)Move the SW1 Memory Battery Backup strap on the motherboard to the ON position (Figure 5-3).

3)If applicable, install the K4RCU into the Base Key Service Unit (see Paragraph 14).

4)If applicable, install the KSTU into the Base Key Service Unit (see Paragraph 6).

5)Plug the AC power cable into an outlet (Figure 5-3).

The "AC" LED on the power supply will light green (If not, refer to the Fault Finding sec- tion later in this manual).

INSTALLATION-DK16 KSU & PCB

SECTION 100-816-205

MARCH 1993

6)Turn the switch on the power supply to the ON position (Figure 5-3).

The "DC" LED on the power supply will light green. (If not, refer to the Fault Finding section later in this manual).

7)Using a voltmeter or other device which checks voltage, measure the voltages referenced to frame ground (FG) at the DC OUT connector pins (test points) located on the motherboard (Figure 5-3). The voltages should fall within the ranges below. If the voltages do not fall within the ranges, unplug the DC power pins from the DC OUT connector and measure again at the same location; if the ranges remain unacceptable, replace the power sup- ply (see Paragraph 3).

Yellow-Green, Black, and Green Wires: 0V

Yellow Wire: -24V

Range: -26.3V ~ -27.8V

Red Wire: 5V

Range: 4.5V ~ 5.5V

Blue Wire: -5V

Range: -4.5V ~ -5.5V

2.20 Mounting the Base Key Service Unit

1)Make sure the power supply switch is turned OFF.

2)Place the Base Key Service Unit on the de- sired location on the mounting surface and mark the location of the four screw holes (there is one on each corner). See Figure 5-2.

NOTE:

Make sure the location of the Base Key Service Unit meets the minimum clearance requirements specified in Figure 2-2 in Chap- ter 2.

3)Drill holes on these marks.

NOTE:

If mounting the KSU directly to a wall, be sure to align screws with studs behind the wall; if using a hard board between the KSU and the wall, install screws first to the hard board, and then secure the hard board to the wall, mak- ing certain that screws are aligned with studs.

5-1

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Toshiba DK8, DK 16 manual Mounting the Base Key Service Unit, Drill holes on these marks