_ FCO VT220-I001, Fails to communicate with host +-----------------------------------------------------------------------------+ | | | _ _ _ _ _ _ _ Level of Urgency Page_1_ | || | | | | | | | +---+ Of_18__ | ||d|i|g|i|t|a|l| FCO VT220-I001 | I | | ||_|_|_|_|_|_|_| +---+ | |_____________________________________________________________________________| | | | FIELD CHANGE ORDER Number: VT220-I001 | |_____________________________________________________________________________| | Applicability: Rework all VT220 Terminals operating at line voltages 200 | | Volts and above. | | | | | |_____________________________________________________________________________| | Problem/Symptom: VT220 operating off line voltage greater than 200 VAC | | fails to communication with the host. The cause | | is found to be failure of the Host interface logic. | | | |_____________________________________________________________________________| | Quick Check: After the cover is removed from the VT220 look to see if | | part number 70-22659-01 is written on end of the Line Filter that the | | green/yellow, brown and blue wire leave the Line Filter. | |_____________________________________________________________________________| | Compatibility/Prerequisite FCO: NONE | Est. Time to Install: | | | .5 hour | |___________________________________________________|_________________________| | Special Tools or Test Equipment: Standard Terminals Tool Kit | | | |_____________________________________________________________________________| | FCO Parts Information | |_____________________________________________________________________________| | Order by Quantity: Part Number: Description: | | FCO Kit#: 1 70-22659-01 Line Filter Assembly | | EQ-01376-01 2 90-09996-00 Tie Wrap | | 1 FA-04658-01 FCO Document | | | | | |_____________________________________________________________________________| |EQ Kit Variation System/Option Applic: VT220-A/-B/-C/-A3/-B3/-C3 | |_____________________________________________________________________________| | Approvals | |_____________________________________________________________________________| | CSSE Engineer | F.S. Product Safety | F.S. Logistics | | James Riess | William Henry | Ed Duggan | |____________________|__________________________|_____________________________| | CSSE Manager | F.S. Microfiche Libraries| Affected Population: | | Bob Bills | | 28000 | |____________________| PDP8 |____________________________ | | ESD&P Micropub. | PDP-11 | Initial Kitting: | | Barbara Eriss | LCG | 15000 | |____________________| |____________________________ | | Revision: | VAXnotes | Hardcopy Publication: | | A | STARS | 20000 | |____________________| |_____________________________| | FCO Release Date | | Parts Availability: | | 13-Dec-85 | | December 1985 | +-----------------------------------------------------------------------------+ _ _ _ _ _ _ _ | | | | | | | | | FCO VT220-I-001 |d|i|g|i|t|a|l| | |_|_|_|_|_|_|_| | PAGE 2 OF 18 | | _____________________________|_______________________________________ DESCRIPTION OF FCO VT220-I-001 This FCO replaces DEC component Part Number 12-22074-01 Revision "A1" of the power input line filter with Revision "B1". The Revision "B1" line filter has the DEC assembly Part Number 70-22659-01 written on the load end of the line filter (the end that the three lead wires come out of). The Revision "A1" line filters do not have a Part Number marked in this location. ****************************************************** * NOTE * * * * The new Line Filter assembly has two Part * * Numbers associated with it. The Part Number * * 12-22074-01 (the line filter as a * * component) is at Revision "B1" and the Part * * Number 70-22659-01 (the line filter as an * * assembly) is at Revision "A1". * * * ****************************************************** An inductor in the input circuit of the Line Filter has been removed in Revision "B1". This FCO needs to be installed in VT220 Terminals operating at line voltages above 200 volts. _ _ _ _ _ _ _ | | | | | | | | | FCO VT220-I-001 |d|i|g|i|t|a|l| | |_|_|_|_|_|_|_| | PAGE 3 OF 18 | | _____________________________|_______________________________________ ACCESS COVER To remove the Terminal Access Cover, perform the following: ****************************************************************** * NOTE * * * * If a VT22X-AA modem is installed, it will need to be * * removed first. * ****************************************************************** 1. Turn the power to the terminal to "OFF". 2. Disconnect the power cord from the wall outlet. Remove the power cord from the terminal's power cord connector. 3. Disconnect the keyboard cable connector and the connector from the video output jack, if applicable. 4. Disconnect all other cables from the rear panel of your terminal, including the following: - EIA host port cable - 20 mA host port cable - printer port cable **************************************************************** * NOTE * * * * Before you go to step 5, place a piece * * of paper on a flat work surface to avoid * * scratching the monitor bezel. Carefully * * place the monitor face down on this * * paper. * * * * Use the cleaning solution supplied with * * the monitor or use isopropyl alcohol to * * clean CRT after you service the monitor. * **************************************************************** 5. With a scribe, remove the plastic cap on the rear panel of the access cover (See FIGURE 1). 6. With a phillips screwdriver, remove the screw and washer that were exposed when you removed the cap. This screw helps hold the access cover to the terminal's chassis. _ _ _ _ _ _ _ | | | | | | | | | FCO VT220-R-001 |d|i|g|i|t|a|l| | |_|_|_|_|_|_|_| | PAGE 4 OF 15 | | _____________________________|_______________________________________ 7. With the scribe, remove the two caps on the bottom side of the access cover. 8. Remove the screws and washers that were exposed when you removed these caps (See FIGURE 2). *************************************************************** * WARNING * * * * The next step exposes you to the CRT * * anode, which may contain a stored high * * voltage. Use caution while the access * * cover is off the terminal. * *************************************************************** 9. Remove the access cover by sliding it straight up (See FIGURE 3). *************************************************************** * CAUTION * * * * During installation, the access cover * * may require careful positioning to align * * the screw holes. * *************************************************************** _ _ _ _ _ _ _ | | | | | | | | | FCO VT220-R-001 |d|i|g|i|t|a|l| | |_|_|_|_|_|_|_| | PAGE 5 OF 15 | | _____________________________|_______________________________________ _ _ _ _ _ _ _ | | | | | | | | | FCO VT220-R-001 |d|i|g|i|t|a|l| | |_|_|_|_|_|_|_| | PAGE 6 OF 15 | | _____________________________|_______________________________________ _ _ _ _ _ _ _ | | | | | | | | | FCO VT220-R-001 |d|i|g|i|t|a|l| | |_|_|_|_|_|_|_| | PAGE 7 OF 15 | | _____________________________|_______________________________________ _ _ _ _ _ _ _ | | | | | | | | | FCO VT220-I-001 |d|i|g|i|t|a|l| | |_|_|_|_|_|_|_| | PAGE 8 OF 18 | | _____________________________|_______________________________________ POWER SUPPLY/MONITOR BOARD To remove the power supply/monitor board, perform the following: ************************************************************* * WARNING * * * * This procedure exposes you to the high * * voltage of the CRT and the power supply. * * Use caution while the access cover is * * off the terminal. * ************************************************************* 1. Disconnect the 26-pin flat cable connector from the terminal controller board (See FIGURE 4). 2. To disconnect the following cables from the power supply/monitor board (in order), perform the following: a. The 2-wire cable that runs to the power OK indicator on the front bezel (See FIGURE 4). b. The 6-wire input cable that runs to the rear chassis panel (See FIGURE 5). c. The 7-wire cable that runs to the flyback transformer (See FIGURE 5). 3. Remove the white ground wire from the tab on the CRT ground loop clamp. This wire runs to the round CRT connector (See FIGURE 6). 4. Remove the round CRT connector from the base of the CRT. 5. Remove the four phillips screws on the power supply/monitor board that holds the board to the chassis (See FIGURE 7). 6. Cautiously move the power supply/monitor board away from the chassis so you can see the remaining connectors (See Figure 8). 7. Untwist the white plastic clamp that holds the CRT round connector cable to the chassis. _ _ _ _ _ _ _ | | | | | | | | | FCO VT220-I-001 |d|i|g|i|t|a|l| | |_|_|_|_|_|_|_| | PAGE 9 OF 18 | | _____________________________|_______________________________________ 8. Disconnect the 4-wire cable that runs to the yoke of the CRT to free the power supply/monitor board. ************************************************************** * NOTE * * * * Make sure you can reach the CRT round * * connector cable (to install it) after you * * secure the power supply/monitor board to * * the chassis with screws. When replacing * * the CRT round connector, make sure that * * it is seated firmly on the neck of the * * CRT. * ************************************************************** ************************************************************** * CAUTION * * * * To protect the components on the power * * supply/monitor board from short circuiting, * * make sure you reinstall the insulating paper. * ************************************************************** 9. Set the power supply/monitor board off to one side. _ _ _ _ _ _ _ | | | | | | | | | FCO VT220-R-001 |d|i|g|i|t|a|l| | |_|_|_|_|_|_|_| | PAGE 10 OF 15 | | _____________________________|_______________________________________ _ _ _ _ _ _ _ | | | | | | | | | FCO VT220-R-001 |d|i|g|i|t|a|l| | |_|_|_|_|_|_|_| | PAGE 11 OF 15 | | _____________________________|_______________________________________ _ _ _ _ _ _ _ | | | | | | | | | FCO VT220-R-001 |d|i|g|i|t|a|l| | |_|_|_|_|_|_|_| | PAGE 12 OF 15 | | _____________________________|_______________________________________ _ _ _ _ _ _ _ | | | | | | | | | FCO VT220-R-001 |d|i|g|i|t|a|l| | |_|_|_|_|_|_|_| | PAGE 13 OF 15 | | _____________________________|_______________________________________ _ _ _ _ _ _ _ | | | | | | | | | FCO VT220-R-001 |d|i|g|i|t|a|l| | |_|_|_|_|_|_|_| | PAGE 14 OF 15 | | _____________________________|_______________________________________ _ _ _ _ _ _ _ | | | | | | | | | FCO VT220-I-001 |d|i|g|i|t|a|l| | |_|_|_|_|_|_|_| | PAGE 15 OF 18 | | _____________________________|_______________________________________ LINE FILTER ASSEMBLY The line filter assembly is the component the power cord plugs into on the back of the VT220 terminal. To remove and replace the Rev "A1" line filter, perform the following: 1. Cut the two tiewraps that hold the wire from the line filter in a bundle with other wires. 2. Noting which faston is on which switch connector, unplug the brown (switch connection #2) and the blue wires (switch connection #5) from the power switch. 3. Loosen and remove the nut that secures the green ground wire from the line filter to the chassis ground. 4. Remove the two phillips screws that secure the line filter and EMI shield to the chassis assembly. 5. Ensure that the line filter received with this FCO is marked Rev "B1" for the 12 class Part Number (12-22074-01) and that the assembly Part Number 70-22659-01 (Rev "A1") is written on the load end of the Filter. Slide the EMI shield over the filter. Make sure the screw holes of the filter are not covered by the shield. 6. Install Rev "B1" line filter assembly to the chassis using the two phillips screws removed previously, making sure that the center ground connection of the power plug (LINE END) is nearest the bottom of the terminal. 7. Replace the green grounding lug and tighten the ground nut snugly. ******************************************************** * CAUTION * * * * Make sure the Ground nut is * * tight enough to compress the * * lock washers. * ******************************************************** 8. Reconnect the brown (switch connection #2) and blue (switch connection #5) faston connectors to the power switch. 9. Use the two tiewraps provided to bundle the wires back together. 10. Reinstall the Power Supply/Monitor board. 11. Reinstall the back cover, communication cables and printer cable. \^ VT220 \\VT220 \\RIESS \\1985 \\DEC \\FCO_DOCS