Lexmark CS820dtfe

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Снят с производства

Тип устройства

Принтер

Технология печати

лазерная

Макс. формат

Число страниц в месяц

200000

Скорость печати A4

Цветность печати

цветная

Общие характеристики
Размещение	настольный
Цветность печати	цветная
Тип устройства	Принтер
Макс. формат	A4
Печать фотографий
Копир
Сканер
Факс
Телефон
Число страниц в месяц	200 000
Область применения	большой офис
Технология печати	лазерная
Тип	лазерный/светодиодный
Принтер
Макс, длина отпечатка	356
Количество цветов	4
Макс, ширина отпечатка	216
Двусторонняя печать
Прямая печать
Печать без полей
Пигментные чернила
Макс, разрешение для ч/б печати
По Y	600
По X	1 200
По Y	1 200
По X	2 400
Скорость ч/б печати
A4	57
Время выхода первого отпечатка
Ч/б	7
Цветн,	7
Сканер
Отправка изображения по e-mail
Стандарт TWAIN
Слайд-адаптер
Стандарт WIA
Расходные материалы
Количество картриджей	4
Ресурс цветного картриджа/тонера	8 000
Ресурс ч/б картриджа/тонера	8 000
Ресурс девелопера	300 000
Ресурс фотобарабана	175 000
Печать на:
Фотобумаге
Рулоне
CD/DVD
Конвертах
Карточках
Этикетках
Глянцевой бумаге
Матовой бумаге
Пленках
Плотность бумаги
Минимальная	60
Максимальная	300
Факс
Цветной
Телефон
Беспроводная трубка
Проводная трубка
Caller ID
Автоответчик
Стандарт DECT
Спикерфон
АОН
Шрифты и языки управления
Языки управления
PostScript 2
PPDS
PCL 5c
PCL 5e
PCL 6
PDF
PostScript
PostScript 3
Количество установленных шрифтов
PostScript	165
PCL	84
PPDS	54
Лотки
Емкость лотка ручной подачи	100
Подача бумаги
Максимальная	4 500
Стандартная	1 200
Вывод бумаги
Стандартный	500
Максимальный	500
Финишер
Сортер
Брошюровщик
Степлер
Интерфейсы
Версия USB	2,0
Устройство для чтения карт памяти
FireWire (IEEE 1394)
Wi-Fi
Bluetooth
LPT
Инфракрасный порт
RS-232
Ethernet (RJ-45)
USB
Веб-интерфейс
Память/Процессор
Объем памяти	1 024
Макс, объем памяти	3 072
Частота процессора	1 330
Процессор	Dual Core
Дополнительная информация
Диагональ дисплея	4,3
Экран
Работа от аккумулятора
Поддержка ОС
DOS
Linux
Windows
Mac OS
Потребляемая мощность
В режиме ожидания	80
При работе	800
Уровень шума
При работе	56
В режиме ожидания	14
Габариты
Вес	75,9
Ширина	646
Глубина	522
Высота	690

Коды ошибок

100.01

102.20...102.31

102.32...102.52

110.20...110.92

121.00...121.15

121.17...121.18

121.32...121.34

121.50

121.71...121.84

126.06

126.10, 126.11

128.00

130.80...130.85

136.80...136.85

137.80...137.85

141.80...141.85

145.80...145.85

147.80...147.85

148.80...148.85

149.80...149.85

150.80...150.85

151.80...151.85

153.80...153.85

155.80...155.85

156.80...156.85

157.80...157.85

158.80...158.85

160.80...160.85

161.80...161.85

162.80...162.85

165.80...165.85

166.70...166.75

171.80...171.85

172.80...172.85

173.80...173.85

174.80...174.85

175.80...175.85

178.80...178.85

179.80...179.85

200.16

200.23

200.91

200.x2

200.x4

200.x5, 200.x7

201.91

202.91

202.x2

202.x3

202.x4

202.x5, 202.x7

212.91

212.x2

212.x3

212.x4

212.x5, 212.x7

213.91

213.x2

213.x3

213.x4

213.x5, 213.x7

221.91

230.91

230.x2

230.x3

230.x4

230.x5

231.91

231.x2

231.x3

231.x4

231.x5

232.x3

232.x4

232.x5, 232.x7

241.83, 241.84

242.36

242.43, 242.53

242.83, 242.84

242.x1

242.x2

242.x4

242.x5, 242.x7

243.83, 243.84

243.x1

243.x2

243.x3

243.x4

243.x5, 243.x7

243.x6

245.83, 245.84

280.11

280.13

280.15

281.11

281.15

281.16

282.11

282.13

282.15

283.11

283.15

284.11

284.13

284.15

288.10

289.10

31...33

320.00

323.80

35...38

360.60, 360.61

362.60, 362.61

363.60, 363.61

364.60, 364.61

374.60, 374.61

377.60, 377.61

383.60...383.61

400.11...400.15

401.11...401.15

402.51...402.55

403.13...403.55

415.33, 415.35

416.74, 416.75

417.31...417.35

420.11

420.12...420.55

421.13, 421.15

422.13, 422.15

423.13...423.55

424.13, 424.15

426.13...426.55

428.13, 428.15

429.11...429.15

430.19

436.13, 436.15

439.19

61, 62

655.84...658.84

660.83

661.83

662.23, 663.33, 664.43, 665.53

662.83

663.83

664.83

665.83

666.83, 667.83, 668.83, 669.83

900.xx

980.xx, 981.xx, 982.xx

983.xx, 984.xx

Описание

Парткод

Название

LEXMARK Блок проявителя черный

LEXMARK Блок проявителя голубой

LEXMARK Блок проявителя пурпурный

LEXMARK Блок проявителя желтый

LEXMARK Блок проявителя цветной

LEXMARK Блок проявителя голубой, возвратный

LEXMARK Блок проявителя пурпурный, возвратный

LEXMARK Блок проявителя цветной, возвратный

LEXMARK Блок проявителя желтый, возвратный

LEXMARK Блок проявителя черный и комплект фотобарабанов

LEXMARK Блок проявителя цветной и комплект фотобарабанов

LEXMARK Блок проявителя черный и комплект фотобарабанов, возвратный

LEXMARK Блок проявителя цветной и комплект фотобарабанов, возвратный

LEXMARK Блок фотобарабана

LEXMARK Блок фотобарабана, тройная упаковка

LEXMARK Контейнер для отработанного тонера

LEXMARK CS820 Тонер картридж черный (33000 стр.)

LEXMARK CS820 Тонер картридж голубой (22000 стр.)

LEXMARK CS820 Тонер картридж пурпурный (22000 стр.)

LEXMARK CS820 Тонер картридж желтый (22000 стр.)

LEXMARK CS820 Тонер картридж голубой (8000 стр.), возвратный

LEXMARK CX820 Тонер картридж голубой (8000 стр.), для организаций

LEXMARK CS820 Тонер картридж черный (8000 стр.), возвратный

LEXMARK CX820 Тонер картридж черный (8000 стр.), для организаций

LEXMARK CS820 Тонер картридж пурпурный (8000 стр.), возвратный

LEXMARK CX820 Тонер картридж пурпурный (8000 стр.), для организаций

LEXMARK CS820 Тонер картридж желтый (8000 стр.), возвратный

LEXMARK CX820 Тонер картридж желтый (8000 стр.), для организаций

LEXMARK CS820 Тонер картридж голубой (22000 стр.), возвратный

LEXMARK CS820 Тонер картридж голубой (22000 стр.), для организаций

LEXMARK CS820 Тонер картридж черный (33000 стр.), возвратный

LEXMARK CS820 Тонер картридж черный (33000 стр.), для организаций

LEXMARK CS820 Тонер картридж пурпурный (22000 стр.), возвратный

LEXMARK CS820 Тонер картридж пурпурный (22000 стр.), для организаций

LEXMARK CS820 Тонер картридж желтый (22000 стр.), возвратный

LEXMARK CS820 Тонер картридж желтый (22000 стр.), для организаций

LEXMARK Картриджи со скрепками (3 упаковки)

Error code:	100.01
Description:	Engine software error was detected.
Remedy:	Step 1 Check the cable JWTHR1 on the controller board for proper connection. Is the cable properly connected? Go to step 3. Go to step 2. Step 2 Reseat the cable. Does the problem remain? Go to step 3. The problem is solved. Step 3 Check the weather station cable for proper connection. Is the cable properly connected? Go to step 5. Go to step 4. Step 4 Reseat the cable. Does the problem remain? Contact the next level of support. The problem is solved. Step 5 Replace the weather station. See “Weather station removal”. Does the problem remain? Contact the next level of support. The problem is solved.

Error code:	102.20...102.31
Description:	102.20 Tray 2 product ID is invalid. 102.21 Tray 2 controller board ID is invalid. 102.22 The input option type is invalid. 102.30 Tray 3 product ID is invalid. 102.31 Tray 3 controller board ID is invalid.
Remedy:	Step 1 a Make sure that the latest firmware is installed. b Make sure that the options configuration is supported. See the Printer, Option, and Stand Compatibility Guide. c Reset the printer. Does the problem remain? Go to step 2. The problem is solved. Step 2 Check the interface cable for proper connection, and reseat if necessary. Does the problem remain? Go to step 3. The problem is solved. Step 3 Check the interface cable for damage. Is the cable free of damage? Go to step 5. Go to step 4. Step 4 Replace the cable. See “550-sheet tray interface cable removal” or “2200-sheet tray interface cable removal”. Does the problem remain? Go to step 5. The problem is solved. Step 5 Check the interface cable of the printer and adjacent options for damage. Is the cable free of damage? Go to step 7. Go to step 6. Step 6 Replace the cable. Does the problem remain? Go to step 7. The problem is solved. Step 7 Replace the input option controller board. See “550-sheet tray controller board removal” or “2200-sheet tray controller board removal”. Does the problem remain? Go to step 8. The problem is solved. Step 8 Reset the printer. Does the problem remain? Contact the next level of support. The problem is solved.

Error code:	102.32...102.52
Description:	102.32 The input option type is invalid. 102.40 Tray 4 product ID is invalid. 102.41 Tray 4 controller board ID is invalid. 102.42 The input option type is invalid. 102.50 Tray 5 product ID is invalid. 102.51 Tray 5 controller board ID is invalid. 102.52 The input option type is invalid.
Remedy:	Step 1 a Make sure that the latest firmware is installed. b Make sure that the options configuration is supported. See the Printer, Option, and Stand Compatibility Guide. c Reset the printer. Does the problem remain? Go to step 2. The problem is solved. Step 2 Check the interface cable for proper connection, and reseat if necessary. Does the problem remain? Go to step 3. The problem is solved. Step 3 Check the interface cable for damage. Is the cable free of damage? Go to step 5. Go to step 4. Step 4 Replace the cable. See “550-sheet tray interface cable removal” or “2200-sheet tray interface cable removal”. Does the problem remain? Go to step 5. The problem is solved. Step 5 Check the interface cable of the printer and adjacent options for damage. Is the cable free of damage? Go to step 7. Go to step 6. Step 6 Replace the cable. Does the problem remain? Go to step 7. The problem is solved. Step 7 Replace the input option controller board. See “550-sheet tray controller board removal” or “2200-sheet tray controller board removal”. Does the problem remain? Go to step 8. The problem is solved. Step 8 Reset the printer. Does the problem remain? Contact the next level of support. The problem is solved.

Error code:	110.20...110.92
Description:	110.20 Printhead error (mirror motor lock is asserted) was detected before the motor was turned on. 110.21 No printhead power (+5V) when the laser servo started. 110.31 Printhead error (no first Hysnc) was detected. 110.32 Printhead error (lost first Hysnc) was detected. 110.33 Printhead error (lost first Hysnc) was detected during servo. 110.34 Printhead error (mirror motor lost lock) was detected. 110.35 Printhead error (mirror motor no first lock) was detected. 110.36 Printhead error (mirror motor never stabilized) was detected. 110.41 Printhead NVRAM read failure occurred. 110.70 Printhead NVRAM values were incorrect. 110.91 Printhead timing error was detected. 110.92 Printhead NVRAM checksum mismatch occurred.
Remedy:	Step 1 Reset the printer. Does the problem remain? Go to step 2. The problem is solved. Step 2 Check the controller board sockets JWPR1 and JVD01 connections. Are the cables properly connected? Go to step 4. Go to step 3. Step 3 Reseat the cables. Does the problem remain? Go to step 4. The problem is solved. Step 4 Check the printhead connections. Is the printhead properly connected? Go to step 6. Go to step 5. Step 5 Reseat the cables. Does the problem remain? Go to step 6. The problem is solved. Step 6 Check the printhead cables for damage. Are the cables free of damage? Go to step 8. Go to step 7. Step 7 Replace the cables. Does the problem remain? Go to step 8. The problem is solved. Step 8 Reset the printer. Does the problem remain? Go to step 9. The problem is solved. Step 9 Replace the printhead. See “Printhead removal”. Does the problem remain? Go to step 10. The problem is solved. Step 10 Reset the printer. Does the problem remain? Go to step 11. The problem is solved. Step 11 Replace the controller board. See “Controller board removal”. Does the problem remain? Contact the next level of support. The problem is solved.

Error code:	121.00...121.15
Description:	121.00 Fuser did not reach the required temperature (during warmup). 121.02 Fuser went over the required temperature (during EWC/Line voltage detection). 121.03 Fuser hardware and driver are mismatched. 121.09 Fuser did not reach the required temperature for motors (not applicable to standby mode). 121.10 Fuser did not reach the required temperature (during start of EWC/Line voltage detection). 121.11 Fuser reached the required temperature (during final EWC/Line voltage detection) too late. 121.12 Fuser did not reach the required temperature (during final EWC/Line voltage detection). 121.13 Fuser reached the required temperature (during final EWC/Line voltage detection) too fast. 121.15 Power of fuser heater is too high.
Remedy:	Step 1 Check the fuser for proper installation. Is the fuser properly installed? Go to step 3. Go to step 2. Step 2 Reinstall the fuser. Does the problem remain? Go to step 3. The problem is solved. Step 3 Remove the fuser, and then install a different fuser. See “Fuser removal”. Does the problem remain? Go to step 4. The problem is solved. Step 4 Check the controller board socket JFSR1 connection. Is the cable properly connected? Go to step 6. Go to step 5. Step 5 Reseat the cable. Does the problem remain? Go to step 6. The problem is solved. Step 6 Reset the printer. Does the problem remain? Go to step 7. The problem is solved. Step 7 Replace the LVPS. See “LVPS removal”. Does the problem remain? Go to step 8. The problem is solved. Step 8 Check the fuser cables for damage. Are the cables free of damage? Go to step 10. Go to step 9. Step 9 Replace the cables. Does the problem remain? Go to step 10. The problem is solved. Step 10 Reset the printer. Does the problem remain? Go to step 11. The problem is solved. Step 11 Replace the LVPS. See “LVPS removal”. Does the problem remain? Go to step 12. The problem is solved. Step 12 Reset the printer. Does the problem remain? Go to step 13. The problem is solved. Step 13 Replace the controller board. See “Controller board removal”. Does the problem remain? Go to step 14. The problem is solved. Step 14 Reset the printer. Does the problem remain? Contact the next level of support. The problem is solved.

Error code:	200.16
Display:	200.16
Description:	Input sensor is made when printer powers up or covers are closed. Possible causes: • Paper jam leaving page over sensor • Defective input sensor • Faulty system card
Remedy:	• Check for anything in the paper path that might cause the paper to jam.

Error code:	34
Description:	Non-continuous labels are being treated as continuous labels.
Causes:	The printer was not calibrated for the media being used. The printer is configured for continuous media.
Remedy:	Perform the calibration procedure in Calibrate Media and Ribbon Sensor Sensitivity on page 90. Set the media type to noncontinuous media. See Set Media Type on page 81.

Error code:	39
Description:	The printer locks up while running the Power-On Self Test.
Causes:	Main logic board failure.
Remedy:	Replace the main logic board.

Error code:	42
Display:	Self Diagnostic Temperature
Description:	10-352 ERROR 42 FUSER STS (FRONT) WARM TIME FAILURE
Causes:	1. The ‘Open Cover’ microswitch may be stuck or faulty 2. The tab on the front cover may be damaged or broken 3. Check the connector and cables between Switch and main PBA.
Remedy:	Measure the resistance between the Fuser Assembly connector P600-1 and P600-3. Does the resistance measure approximately 6 ohms for a 110 VAC Fuser or approximately 20 ohms for a 220 VAC Fuser? Y↓N→ Replace the Fuser Assembly. Measure the resistance between the Fuser Assembly connector P600-4 and P600-6. Does the resistance measure between 20K and 100K ohms? Y↓N→ Replace the Fuser Assembly. Reinstall Fuser. Remove the Rear Cover, Rear Shield and the Rear Shield Bracket. Measure the resistance between P404A-1 and P404A-2 on the Engine Control Board. Does the resistance measure between 20K and 100K ohms? Y↓N→ Repair or replace the wiring harness between the Engine Control Board and the Fuser. Reinstall the Fuser. Switch printer power ON. Does the Fuser get warm? Y↓N→ Replace the Chassis AC Power Assembly. Replace the Engine Control Board.

Error code:	50
Display:	Tray 2 Paper Empty
Description:	Fuser Fan Failure The Fuser Fan rotation signal indicates to the Engine Control Board that the fan is no longer operational.
Causes:	• Fuser Fan, PL5.3.31 • FAN/PHD/MOT Harness, PL10.1.9 • Engine Control Board, PL9.1.16
Remedy:	1 Check the Fuser Fan for damage. Remove the Front Cover. Is the fan damaged? Replace the Fuser Fan. Go to Step 2. 2 Check the Fuser Fan connection. Is P/J482 connected to the harness? Go to Step 2. Reconnect the Fan. 3 Check orientation of the Fuser Fan. Does the Fan’s label face into the chute? Go to Step 3. Correct the installation. 4 Test the Fuser Fan. Run the Service Diagnostics Fuser Fan test. Does the Fan operate. Go to Step 6. Go to Step 5. 5 Check all pins on the FAN/PHD/MOT Harness PL10.1.9 for continuity. 1. Disconnect P/J48 and P/J482. 2. Check continuity between J48 <=> P483. Go to Step 5. Replace the FAN/PHD/MOT Harness. 6 Check the fan rotation signal. Print one sheet. Is there +3.3 V across P/J48-A12 <=> P/J48-A13? Replace the Engine Control Board. Replace the Fuser Fan.

Error code:	51
Display:	Send Error (DNS)
Description:	Rear Fan Failure The Rear Fan rotation signal indicates the fan is no longer operational.
Causes:	• Rear Fan, PL1.1.19 • LVPS, PL9.1.6 • Engine Control Board, PL9.1.16 • LV Harness, PL10.1.2
Remedy:	1 Check the Rear Fan for damage. Remove the Rear Cover. Is the fan damaged? Replace the Rear Fan. Go to Step 2. 2 Check the Rear Fan connection. Is P/J166 connected to the harness? Go to Step 3. Connect the Fan. 3 Check orientation of the Rear Fan. Does the Fan’s label face inwards? Go to Step 4. Correct the installation. 4 Test the Rear Fan. Run the Service Diagnostics Rear Fan test. Does the fan operate? Go to Step 6. Go to Step 5. 5 Check for +24 V to the fan. Disconnect P/J166. Is there +24 V across P166-1 <=> P166-3? Replace the Rear Fan. Replace the LVPS. 6 Check the fan rotation signal to the LVPS. Print one sheet. Is there +3.3 V between P/J166-1 <=> P/J166-3? Replace the Fuser Fan. Go to Step 7. 7 Check the rotation signal from the LVPS. Print one sheet. Is there +3.3 V between P/J165-15 <=> P/J165-3? Replace the LVPS. Go to Step 8. 8 Check the fan rotation signal at the Engine Control Board. Print one sheet. Is there +3.3 V between P/J61-4 <=> P/J61-16? Replace the LV Harness Replace the Engine Control Board.

Error code:	52
Display:	Send Error (POP3)
Description:	Fan Failure One of the two fans has failed resulting in a fatal error.
Causes:	• Rear Fan, PL1.1.19 • Fuser Fan, PL5.3.31
Remedy:	1 Check the fans for damage or debris: • Fuser Fan, PL1.1.19 • Rear Fan, PL5.3.31 Is either fan damaged? Replace the defective fan. Go to Step 3. 2 Replace the defective fan. Does the error persist? Go to Step 3 Complete 3 Test the fans. Run the Service Diagnostics fan tests to isolate the defective fan. Did one of the fans fail? Go to the troubleshooting procedure for the specific fan. If both fans pass, replace the Engine Control Board.

Error code:	53
Display:	Send Error (SMTP)
Description:	The password did not match in a relay or mailbox transmission, and the transmission ended in failure.
Causes:	· Loose cable connection · Defective controller fan · Defective IOD1 board · Defective MCTL board
Remedy:	Confirm that both parties are using the same system password and the both units are compatible. Then, ask the remote party to transmit again.

Error code:	54
Display:	Send Error (Wrong Config)
Description:	10-398 ERROR 54 FAN FAILURE
Causes:	· Loose cable connection · Defective ozone fan · Defective IOD2 board · Defective MCTL board
Remedy:	Enter Service Diagnostics Mode. Run the “Fuser Fan” test. Does the Fuser Fan operate? Y↓N→ Remove the Rear Cover, Rear Shield and the Rear Shield Bracket. Measure the voltage between P530-1 on the Engine Control Board and frame ground. Does the voltage measure +24 VDC? Y↓N→ Replace the Engine Control Interface Board. Measure the voltage between P530-4 on the Engine Control Board and frame ground. Does the voltage measure 0 VDC? Y↓N→ Replace the Engine Control Interface Board. Measure the voltage between P530-3 on the Engine Control Board and frame ground. Does the voltage measure +5 VDC? Y↓N→ Replace the Engine Control Board. If the problem persists, repair or replace the harness between Engine Control Board and the Fuser Fan. Replace the Fuser Fan Assembly. Remove the Rear Cover, Rear Shield and the Rear Shield Bracket. Measure the voltage between P530-5 on the Engine Control Board and frame ground. Does the voltage measure +24 VDC? Y↓N→ Replace the Engine Control Interface Board. Measure the voltage between P530-8 on the Engine Control Board and frame ground. Does the voltage measure 0 VDC? Y↓N→ Replace the Engine Control Interface Board. Measure the voltage between P530-7 on the Engine Control Board and frame ground. Does the voltage measure +5 VDC? Y↓N→ Replace the Engine Control Board. If the problem persists, repair or replace the harness between Engine Control Board and the +24 VDC LVPS Fan. Replace the +24 VDC LVPS Fan.

Error code:	55
Display:	[Stop Pressed]
Description:	Stop/Clear has been pressed during a fax transmission.
Causes:	· Loose cable connection · Defective fusing unit fan · Defective IOD1 board · Defective MCTL board
Remedy:	Try again.

Error code:	56
Display:	Toner Empty
Description:	The toner cartridge has run out. The machine stops printing.
Causes:	Harness connection failure of back cover switch ASSY. Eject actuator failure. Eject sensor PCB ASSY failure. Main PCB failure
Remedy:	Replace the toner cartridge with a new one.

Error code:	58
Display:	Tray 1 Paper Empty
Description:	There is no paper in the tray 1.
Causes:	Harness connection failure between fuser unit and eject sensor PCB. Fuser unit failure. LVPS PCB failure. Eject sensor PCB ASSY failure. Main PCB failure
Remedy:	Load paper in the tray 1.

Error code:	80
Display:	ERROR 80 FORMAT
Description:	Engine Logic Board Failure, Code 80
Remedy:	1. Cycle power to the printer to clear the error. 2. Did this clear the error? Complete Replace the engine control board or the image processor board.

Error code:	84
Display:	h`********
Description:	Controller to Engine Logic Board Time Failure, Code 84
Remedy:	1. Cycle power to the printer to clear the error. 2. Did this clear the error? Complete. Replace the engine control board.

Error code:	85
Display:	ROM HASH
Description:	Engine Logic Board Micro Pitch Failure, Code 85
Remedy:	1. Cycle power to the printer to clear the error. 2. Did this clear the error? Complete. Replace in the following order: • engine control board • image processor board

Error code:	88
Display:	Paper Jam
Description:	Lower Tray Communication Failure, Code 88
Causes:	• Engine Control Interface Board • Tray module board • Engine Control board
Remedy:	1 Is J668-1 on the tray module board +5 VDC? Go to step 2. Use the wirenets to troubleshoot and repair the open wire. 2 Is J668-3 on the tray module board +24 VDC? Go to step 3. Use the wirenets to troubleshoot and repair the open wire. 3 1. Check the following connectors for continuity: • P669-1 to J534A-15 • P669-2 to J534A-14 • P669-3 to J534A-13 • P669-4 to J534A-12 • P669-5 to J534A-11 • P669-6 to J534A-10 2. Do all checks indicate continuity? Replace in the following order: • engine control interface board • tray module board • engine control board Check and repair broken wires or bad connectors.