Repairing CRT Monitor G2 Problems

 

Jaketronics Computers & Electronics Repair Services
Jaketronics Computers & Electronics Repair Services

Technicians Report Log

TRL No.

0902-1

TRL.Blank.doc

Name

Department

Date / Time

Yanjuan

Savlon Security Services

Sat. 14/02/09 12:39pm

Job Description:

Monitor no display problem.

Equipment Description:

Pecom NH570 15” CRT Colour Monitor (Black)

Diagnosis:

-Arc welding was in progress outside when monitor became faulty.

-User noticed a change in colour to yellowish display and then blank (no display).

Troubleshooting:

-Switched on. High voltage present. Heard and felt static on monitor glass.

-. Green power led blinking.

-No display while connected to desktop

-Opened cover to check for burnt components. Nil.

-Checked G2 voltage. Zero.

-Removed G2 line from CRT board and checked voltage. 299VDC.

 

Fault:

Power surge caused blue resin coated High Voltage ceramic capacitor (103, 2KV) to short out.

 

Remedy / Recommendations:

-Voltage check on CRT board and G2 circuit.

-Direct replace blue resin coated High Voltage ceramic capacitor (103, 2KV)

-Powered on monitor and connected to Desktop. Windows xp logo displayed.  Problem Solved.

Date / Time Accomplished:

Sat. 14/02/09 1:00pm

 

Note:  Thanks to Jestine Yong www.jestineyong.com I was able to fix this monitor.

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Installing VSAT

 

TRL No.

0710-24

 

Name

Department

Date / Time

John Konie

MIS

20/10/07  9:00am

 

 

 

Job Description:

Assist Telikom Technicians to Install ViaSat Satellite broadband Dish

Equipment Description:

VSAT Antenna/mount/LNB

LinkStar®  RCST

 

Materials:  Conduit, Coax cables, Insulation tapes and cable ties.

Diagnosis:

Located satellite 270◦ West. With compass and GPS.

270 Degrees West
270 Degrees West

 

 

Checked site and location where dish would be mounted. Access by forklift up to roof of weighing bay, then climb standing ladder to Cold Storage Roof top. Coax cable to be dropped 90◦ downwards and through a drilled hole 25mm.

Fault:

NIL (New Installation)

Remedy / Recommendations:

-Used 2.5M x 65mm galvanized pipe to hold dish and mounted into stand.

– Configured RCST IP, calculating default IP.

-Installed VSAT antenna on top of RDEX Cold Storage building facing 270◦ West.

Located satellite and locked in with spectrum analyzer.

 

Confirmed IP address and Gateway with Telekom VSAT HUB.

-ISP Daltron disconnected and connected onto Telekom VSAT.  Speed 10.0Mbps

-Confirmed with Telecom Technicians that 10Mbps was good speed using speed test for download and upload.

Date / Time Accomplished:

22/10/07 3.00pm.

 

Relocating roof mounted VSAT to ground mounting at Vidar Plant Madang
Relocating roof mounted VSAT to ground mounting at Vidar Plant Madang

TRL No.

0802-3

 

Name

Department

Date / Time

John Konie

MIS

15/02/08 14:00hrs

 

 

 

Job Description:

2nd VSAT Installation.

Equipment Description:

1.8m Satellite Dish.

Diagnosis:

Removed 1.2m Satellite Dish from Roof top that was loosing signal due to shaky movement during strong windy periods also when birds perch on dish and feed horn arrangement. 

Fault:

Unsteady bracing and need larger dish.

Remedy / Recommendations:

Installed 1.8m Dish Ground post mounted.

Locked onto Satalite NSS-6 at 270° W Signal Strength at 17 bars. On Spectrum analyzer.

 

Date / Time Accomplished:

16/02/08 2200hrs.

 

 

It took two fork lifts and muscle to manuvour this dish onto its bracket
It took two fork lifts and muscle to manuvour this dish onto its bracket

It was hot and sunny and the saftey specs had been crushed under the forklift that was elevating me onto the roof. 

Removing the 1.2m dish from the roof top was a breeze.  However, it took a little longer and two forlifts to maneuver the 1.8m antenna on the pole bracket.  After the feed horn, LNB arrangement was attached, Russel took out his “Specam” (Nick name for Spectrum Analyser). 

The TX and RX were connected to the Linkstar RCST (Return Channel Satalite Terminal) unit or IDU (In Door Unit) as some would put it and then all of sudden time froze as we tried to lock onto the satalite.  Eyes glancing at the specam, the sound of metal clattering as the shifter on the nut turned to adjust the azimuth.

Tilting it, swirling it right and left as the dish boomed out its microwave at 17 bars on the Specam. Satalite locked. Let’s go inside.

Pulling the coax cables into the control center
Pulling coax cable for TX and RX into control center

 

 

 

Configurations were already set during the first roof installtion so that didn’t take long either.    Just a phone call to the Telikom Hub and confirmed that the IP address and gateway was sited. 

Linksys SR2024 connecting internet to other users
Linksys SR2024 connecting internet to other users

 Conducted a speed test at www.speedtest.net    Thanks to Telekom PNG’s new ViaSat system,  I can listen to live internet radio and download and upload at a faster speed.

Repairing Epson LX300 Power Board

Computers & Electronics
Contact Jakeman on 675 72941978 or 675 /852 3031 ext. 23

 

 

Technicains Report Log (TRL)

TRL No.

WH0811-3

Name

Department

Date / Time

Graham

Warehouse

27/10/08 08:20am

 

 

 

Job Description:

Printer no power.

Equipment Description:

Epson LX 300 II

 

 

 

CN2 on LX300 powerboard
CN2 on LX300 powerboard

 

Diagnosis:

-No power

-burning smell

– Switch Mode Power Supply (SMPS) problem.

– Fuse blown.

-Changed fuse still no power.

Changed 5W 10Ω J 64 resistor.  Shorted out on pwer up.

Checked primary resistors.OK. Checked filter capacitors. OK. Checked FET K2718. Faulty.

Fault:

Power Burn out caused by voltage fluctuation.

Remedy / Recommendations:

Parts is a problem.  Need to modify another similar SMPS board to fit.

Salvaged power board from old Epson FX 1120.  Modified to fit into ATX PSU casing and connected to the main board.

 

Modification details- Solder  Gnd: pin 3,4&9 of CN2 to pin 3,4,5,6,7&8 of fx1120 pwr brd, then solder pin 1&2 35vdc to pin 10&9 on FX1120, then pin 5 (9vdc) to pin 11 of fx1120, pin 8&7 5vdc to pin 1&2 of fx1120, pin 6 is left alone not connected. I used four long wires and used the skin of a LAN cable to cover the wires so that it looks like an external power supply (remember the ATX Power supply unit casing).  I’ll provide some snap shots if you want. Just email me. johnkonie@yahoo.com

 

Now to test it out.  Powered up.ok. LEDs on ok.  Operating buttons working.  Test print ok. 

  

 

Modification of CN2 wires
Modification of CN2 wires

Date / Time Accomplished:

6/11/08 9:000hrs.