AT&T Merlin 820 Service And Maintenance Manual page 93

Communications system

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Trouble on an Accessory

170A

CARTRIDGE

(TYPE III)

EXTRA-

ALERT

JACK

Figure 45—Type III Cartridge and Extra-Alert Modular Line Cord

Step 2. If your extra alert requires a separate 117-volt ac power supply, check that

power is being supplied from the ac outlet. Use a lamp, radio, or similar

device to check the ac outlet. Be sure to use an ac outlet providing 117-

volt ac power, if it is required. Using a voice terminal, dial an outside call

to your other line.

The extra alert works properly,

The extra alert does not work,

Page 90

CONTROL UNIT

TO EXTRA-ALERT

BELL OR HORN

D4CH

MODULAR

LINE

CORD

THEN

Trouble found. The extra alert

requires 117-volt ac power.

Go on to Step 3.

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