CONNECTION GP-WATER 2700170 - Caterpillar

DURATIONS BY 20% EXCEPT 2.66 ms WHICH IS BASED ON A 12.000 kHz OSCILLATOR FREQ. (1C202). SIGNAL SOURCE IS INTERNAL CALIBRATOR. ALL TEST POINTS REFERENCED TO TP1.Waveform Time Relationships (enlarged scale)
VOLTAGES MAY VARY 10%, PULSE DURATIONS BY 20% EXCEPT 83.3 ?s AND 2.66 ms WHICH ARE EXACT BASED ON A 12.000 kHZ OSCILLATOR. (1C202) SIGNAL SOURCE IS INTERNAL CALIBRATOR. ALL TEST POINTS REFERENCED TO TP1.Disassembly Procedure
1 Remove six screws (1) from front panel (2), and remove panel (2) from case (3). Remove four screws (4) from the PC board, and also remove the locknuts from the two front panel switches (5) and (6). Carefully lift front panel (2) from PC (printed circuit) board (7).Calibration Procedure
To make sure the 6V3100 Timing Indicator Group (1) has good accuracy, check its calibration at a minimum of every six months. Also, the timing indicator will need calibration if: A. It does not show 2000 30 R/MIN at (A) and 32.0 .2 DEG at (B), when the CALIBRATION CHECK-OPERATE Switch (C) is in the CALIBRATION CHECK position. With no input signal at (D) or (E), the reading at R/MIN location (A) must show three zeros (000). If four zeros (0000) show, it is an indication of a possible need for calibration of the unit. This error only is not reason enough to do a complete calibration procedure. It is also not necessary to do a complete calibration procedure if the reading at the DEG location (B) has a decimal point as shown, (00.0) in addition to the three zeros.B. Reading is different than (000) at either location (A) or (B).All calibrations can be done with the use of a small screwdriver, a frequency counter and a 6V3030 DMM (digital multimeter). If a frequency counter and a digital multimeter are not available, a 5P9698 Calibrator can be used as a replacement, but it is probable that the interval will be shorter until calibration is again necessary. (1) Remove six screws (2), along the edge, then lift panel (3) from its case.(2) Put power to the 6V3100 Timing Indicator for two minutes or more to get it warm, then use one of the procedures that follow, according to the calibration tools to be used.Calibration Using a Frequency Counter
(1) Connect a frequency counter from TP10 to TP1 (ground).(2) Adjust R204 (OSC. FREQ. ADJ.) so the counter reads 12,000 5 Hz. Disconnect the frequency counter.(3) Connect a 6V3030 DMM (or equivalent multimeter) from TP17 to TP1 (ground). Adjust the DMM to the DCV-200 m scale.(4) Adjust R312 (R/MIN BALANCE) so the DMM reads + 0.1 mV. If a