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| Switch Position | Tester Connection | Resistance |
| "SOURCE" switch pushed | 1 - 2 | Approximately 270 Ω |
| "CH UP" switch pushed | Approximately 740 Ω | |
| "CH DOWN" switch pushed | Approximately 1,3 kΩ | |
| "VOL UP" switch pushed | Approximately 2,1 kΩ | |
| "VOL DOWN" switch pushed | Approximately 3,1 kΩ | |
| "SPEECH" switch pushed | Approximately 4.6 kΩ | |
| "OFF HOOK" switch pushed | Approximately 6.3 kΩ | |
| "ON HOOK" switch pushed | Approximately 8.6 kΩ |