The initial step of any troubleshooting is a thorough visual inspection to look for possible loose or open connections, shorts, dust or other obvious conditions.
Detailed
troubleshooting for fault location and correction is accomplished by
steps outlined in the following (please note that these are located
in the 101 manual available from Process Analyzers):
Troubleshooting Data Table 6-1
Pad Data, Power Supply PCB Table 6-2
Pad Location, Power Supply PCB Figure 6-1.
Pin Data, Amplifier PCB, P2/J2 Table 6-3
Pin Data, Probe Cable, P3/J3 Table 6-4
Pin Data, Alarm Cable, P6/J6 Table 6-5
Disassembly and reassembly as may be required for checking the equipment
or replacing parts are described in Chapter 6 of the manual available
in the 101 manual from Process Analyzers.
===========
WARNING
===========
Turn the function switch on the control panel to the OFF position before
disassembly. Otherwise high voltage of 1200 V DC will be present.
===========
WARNING
===========
Do not observe the light source closer than 6 inches with unprotected
eyes.
When necessary, observe only briefly. Continued exposure to ultraviolet
energy
generated by the light source can be harmful to eyesight.
=========
WARNING
=========
Use
great care when operating the analyzer with the readout
assembly outside its case due to the presence of 1200 V DC.
If, after following the steps cited in this section, the analyzer is
not functioning
properly, contact Process Analyzers' Service Dept. for assistance.
Phone: 1 - (508) 660-5001.
|
Symptom
|
Probable
Cause
|
Corrective
Action
|
| 1. Meter indicates low battery | a. Blown fuse (Fuse Fl, 2A, 5-3) | 1) Check fuse. If blown, check for evidence of shorts in wiring, then replace fuse. |
| b. Bad connections | 1) Check wiring connections. Resolder poor or bad connections. | |
| c. Broken meter | 1) Tip instrument rapidly movement from side to side. Meter needle should move freely, and return to zero. If faulty, replace with new meter. | |
| d. Battery dead | 1)
Disconnect battery and check with volt ohmmeter. Replace if dead. |
|
| e. Battery charge low | 1) Recharge battery, check meter with function switch in BATT position to ensure the charger is operating properly | |
| 2. Low battery | a. Flower supply | 1) Check power supply defective voltages (see Table 6-2 and Figure 6-1). If in error, replace power supply assembly. |
| 3. UV lamp not ON | a. High Voltage interlock (Micro-switch S2) cable connector on readout assembly not operating | 1) Check by applying pressure to switch plunger with at probe cable in place. Adjust the screw on side of cable connector, if required, to increase throw of switch plunger. |
| b. High voltage supply out or faulty | 1) Check high voltage output on power supply board (pad 22). If voltage not correct, (see Table 6-2) replace power supply board. | |
| c. Lamp not making proper connection with high voltage contacts. | 1) Remove lamp, clean and tighten contacts, reinstall lamp. | |
| d. Lamp faulty | 1) Replace lamp. | |
| e. Short in high voltage lines | 1) Check wiring from power supply board to probe cable connector (J3 pin D) to UV lamp contacts (Dl). | |
| 4. Fan not running | a. Fan stuck | 1) Disassemble probe and clean passages and fan by blowing out dust. To remove larger particles use cotton swab, Q-tip or equal. Use care not to damage propellor rotor or blades. |
| b. Fan connections faulty | 1) Check for wiring connections at fan motor and at probe cable connector (J3 pins A and C). Repair as required. | |
| c. Low or dead battery | 1)
Check output battery (power supply board, pad 9). Recharge or replace battery as required. |
|
| d. Fan voltage not correct | 1) Check fan voltage (power supply board pads 19 and 21, probe cable pins A and C). If not correct, replace power supply board . | |
| 2) If fan voltages correct replace fan. | ||
| 5. Meter does not respond | a. Dirty or open probe connection | 1)
Clean and tighten or resolder connections in probe. |
| b. Broken meter | 1) See 1-c-I above. | |
| c. Dirty or open connections to meter | 1) Clean and tighten connections at meter. | |
| d. Low or dead battery | 1) See 4-c-I above. | |
| e. Blown fuse | 1) See I-a-I above. | |
| 6. Meter does not return to zero in STANDBY | a. Broken meter movement | 1) See 1-c-I above. |
| b. Dirty or open connections to meter | 1) See 5-c-I above. | |
| c. Dirty or open connections in probe | 1) See 5-a-I above | |
| d. Zero adjust faulty | 1)
Rotate zero adjust pat (see Fig. 2-1) (R50, Fig. k.6). Check pot
output at meter probe connector (J3 pins B and L). If voltage does not vary, replace zero adjust pot. |
|
| e. Amplifier faulty | 1)
Rotate zero adjust pot. Check amplifier output at probe connector (J3 pin H) or observe meter. if voltage level on meter does not respond, replace amplifier board |
|
| f. Ion chamber shorted | 1)
Clean ion chamber. (see Section 5.2). Recheck for return to zero
in STANDBY. 2) Replace ion chamber. |
|
|
7.
Meter readings, |
a. Incorrect calibration | 1) Recalibrate (see Section 3). |
| b. Lamp dirty | 1) Clean lamp (see Section 5.2) | |
| c. Contamination in ion chamber | 1) Clean ion chamber.. (see Section 5.2) | |
| d. Power supply board faulty | 1) Check power supply board- outputs (pads 17, 20 and 22 (Table 6-2). If voltages not correct, replace power supply board. | |
| e. Dirty or loose connections | 1) Clean or tighten connections at amplifier board, probe cable, and meter. | |
| 8. Meter erratic, unstable, or non-repeatable | a. Loose cable or connection | 1) Check cable connection at control panel. Observe meter. Tighten cable as required. |
| b. Dirty or loose meter connections | 1) Check meter connections. Clean and tighten as required. | |
| c. Contamination in ion chamber | 1) Clean ion chamber. (see Section 5.2). | |
|
d.
Power supply board f a u I t y
|
1) See 7-d-I above. | |
| e. Unstable or noisy lamp | 1) Observe lamp. (Important- see WARNING in Section 6.1). If operation not steady, replace lamp. | |
| f. Function switch in high gain, most | 1) Unstable meter operation is common with function sensitive position switch in most sensitive position. Turn switch to less sensitive position if desirable. | |
| g. Fan not operating properly | 1) Replace fan. | |
| h. Gas flow slow or stopped | 1) See 4-a-I above. | |
| i. Meter,contacts dirty or loose | 1) Clean and tighten contacts, | |
| 9. Drifting meter or sensitivity | a. Ion chamber contaminated | 1) Clean ion chamber, apparent moisture (see Section 5.2). |
