INSTRUCTION MANUAL
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77M-G, 77HP-G,
and 77HP-G/6A
Tone Generators
Read and understand this material before
operating or servicing this equipment.
Failure to understand how to safely operate
this tool could result in an accident causing
serious injury or death.
Register this product at www.greenlee.com
52047312 REV 3
© 2014 Greenlee Textron Inc.
6/14
SAFETY ALERT
SYMBOL
This symbol is used to call your attention to hazards or
unsafe practices which could result in an injury or property
damage. The signal word, defined below, indicates the
severity of the hazard. The message after the signal word
provides information for preventing or avoiding the hazard.
Immediate hazards which, if not avoided, WILL result in
severe injury or death.
Hazards which, if not avoided, COULD result in severe
injury or death.
Hazards or unsafe practices which, if not avoided, MAY
result in injury or property damage.
Do not discard this product or throw away!
For recycling information, go to www.greenlee.com.
All specifications are nominal and may change as design improvements
occur. Greenlee Textron Inc. shall not be liable for damages resulting from
misapplication or misuse of its products.
KEEP THIS MANUAL
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Electric shock hazard:
• Do not expose this unit to rain or moisture.
Contact with live circuits could result in
severe injury or death.
• Use this unit for the manufacturer’s intended
purpose only, as described in this manual.
Any other use can impair the protection
provided by the unit.
• Use test leads or accessories that are
appropriate for the application. Refer to the
category and voltage rating of the test lead
or accessory.
• Inspect the test leads or accessory before
use. The item(s) must be clean and dry, and
the insulation must be in good condition.
• Before opening the case, remove the test
leads from the circuit and shut off the unit.
Failure to observe these warnings could result
in severe injury or death.
Electric shock hazard:
• Do not attempt to repair this unit. It contains no user-
serviceable parts.
• Do not expose the unit to extreme temperatures or high
humidity. Refer to “Specifications.”
Failure to observe these precautions may result in injury and
can damage the instrument.
CAT O 100V MAX.
3
Description
The 77M-G, 77HP-G, and 77HP-G/6A Tone Generators are
intended to identify the conductor within a bundle, at a cross-
connect point, or at the remote end. These testers are housed
in high impact plastic cases, and each is powered by one
9 volt battery. Standard test leads include red and black rubber
insulated test clips and a snag-proof, four-conductor modular
cord and plug. (77HP-G/6A offers angled bed-of-nails clips.)
A three-position toggle switch controls the modes of operation,
and bi-colored Light Emitting Diodes (LEDs) display line polarity
for Lines 1 and 2 (Line 1 only for 77M-G). When a short circuit is
detected, an audible signal will be heard (77HP only). The tone
and short circuit test functions are only applied to Line 1 using
the modular plug.
A tone selector switch (Figure 3), located inside each unit and
accessible from the outside using a slender tool, may be used to
select a fast or slow warble tone output.
The test sets are compatible with all common Central Office
Switching Systems, and the output tone is isolated from DC
voltages.
2
4
1
3
5
Figure 1. Features
Features include:
1. Battery compartment
2. Toggle switch
3. LEDs
4. Test leads
5. Modular cord
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Safety
Safety is essential in the use and maintenance of Greenlee tools
and equipment. This instruction manual and any markings on
the tool provide information for avoiding hazards and unsafe
practices related to the use of this tool. Observe all of the safety
information provided.
Purpose of this Manual
This instruction manual is intended to familiarize all personnel
with the safe operation and maintenance procedures for the
Greenlee 77M-G, 77HP-G, and 77HP-G/6A Tone Generators.
Keep this manual available to all personnel.
Replacement manuals are available upon request at no charge
at www.greenlee.com.
Operation
Electric shock hazard:
• When the tone generator is plugged into a modular jack,
potentially hazardous voltage from the telephone line is
present on the alligator test leads.
• Before opening the case, remove the test leads from the
circuit and shut off the unit.
Failure to observe this warning could result in injury and can
damage the instrument.
All of the following tests can be performed by using the red and
black test leads (as described) or the modular plug.
Note: When using the modular test plug, the polarity test
function applies to Lines 1 and 2 USOC (Line 1 only for 77M-G).
The continuity and tone functions
only
apply to Line 1.
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