It turns out there's a memory backup battery built into this butt set and when it goes bad all functionally stops. So you can get them for a low price. This is how I got this one, knowing that the internal battery would need to be replaced.
TS22L Amplified Speaker (for listening only)
Speakerphone & Speaker (talk and listen when in TALK mode)
Remove three screws near Belt Clip (snap hook) to access battery compartment.
Battery: 2032 3V coin cell.
The standard cord is the P3218-028 Single Piercing Pin.
The most common option is the P3218-234 Angled Bed of Nails that also has a piercing pin.
Harris TS 22L and TS 22AL Data Lockout Series Craft Test Set Description and Use (pdf) is on line.
There's no mention in the manual of the memory backup battery!
Note the U.S. government put a requirement on all purchases some decades ago banning internal batteries that were not user replaceable.
Fig 4 9V measured 2.2V,
CR2032 Measured: 0.017V
Fig 5 The CR2032 battery has tabe spot welded to the top and bottom. The tabs are soldered into the PCB.
Fig 6 I broke the top spot welds and broke the bottom tab to remove the battery.
Fig 8 Checking polarity: top of battery=+
Note solder pad under battery and solder pad
near lower left corner are both ground. Used the latter pad for connection.
Fig 9 Installed.
Fog 10 Need to trim plastic tab on cover.
3708634 Telephone hand test set, M Vantill, G Laing, D Lounsbury, Nortel, 1973-01-02, 379/21 -
Prior Art test sets had Monitor - Talk switch for High or Low impedance.
But were not designed to be connected to a circuit carrying data.
This test set allows bridging a data circuit without problems.
- not well suited for dry loop operation
D258061 Telephone transmitter and receiver, Arthur L. Foreman, (Dracon) Harris, 1981-01-27, -
4682346 Telephone test set, Richard W. Faith, Thomas W. Durston, Fluke (Harris), 1987-07-21
The voltage drop across the polarity indicating circuit of the TS-21 diminishes the usability on "dry circuits"
where there is no central office battery. The TS22 solves this problem and so works on both types of circuit.
4691336 Telephone test set having an auxiliary amplifier and speaker for permitting listening to line signals, Thomas W. Durston, Harris (Fluke), 1987-09-01, - Allows (1) hearing speaker with test set clipped to belt, (2) can listen to DATU (Wiki) messages, (3) in monitor mode no disturbance to line. Replaces an add on amplifier used on the TS-21.
3632878 Piggyback amplifier, John A Stratman, Lumedor Prod, 1972-01-04
Excluding ones that contain a hand crank magneto.
1439729 Telephone hand set, Deakin Gerald, AT&T, 1922-12-26, 379/362; D14/148; 379/370; 379/433.07; 379/433.01 - Belgium may use different dial number order?
1440752 Telephone Test Set, R.B. Stone, 1923-01-02, 379/21 379/433.01 - specifically does NOT have a magneto since they are huge. All prior telephone test sets have had them and so were mounted in wooden boxes.
1613851 Hand telephone, Sengebusch Hans, Automatic Electric, 1927-01-11, 379/370 200/1A D14/148 -
Looks like current standard dial number order.
2039625 Acoustic device, Blount Nelson, Bell Labs, 1936-05-05, 379/370 D14/148 425/DIG.56 379/433.01 -
2520592 Telephone test set with line resistor, Anthony L Wronke, 1950-08-29, 379/21 -
Includes dial (14) mounted behind receiver.
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