NAD-T763Phase2-avr-sm 维修电路原理图.pdf

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1、NADSERVICE MANUALT 763T 763PHASE II & VCDRAFT DATE: 17 MAR 2006New TextRadioFans.CN 收音机爱 好者资料库2SAFETY INFORMATIONAH VERSIONC VERSIONRadioFans.CN 收音机爱 好者资料库3SERVICE SAFETY PRECAUTIONS1. Replacing the fusesCAUTION:FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OFFUSE.Ref

2、erence DesignatorDatabase Part NumberDescriptionF751*AH,AHT370-019100-00(2)FUSE TIME-LAG 10A/250VAC 5X20mmUL/CSA 5TF751*C,CT370-018100-05(2)FUSE TIME-LAG 10A/250VAC 5X20mmVDE/UL/CSA 5TF752*AH,AHT370-011100-06(4)FUSE 1.6A 250V TIME LAG LBC 5x20mm5T UL/CSA/VDE/SEMKOF752*C,CT370-015100-03(3)FUSE 800mA

3、250V TIME LAG LBC 5x20mm5T UL/CSA/VDE/SEMKONOTE: USA, CANADIAN MODEL ONLY.: EUROPEAN MODEL ONLY.2. Safety check out(Only U.S.A. model)Before returning the product to the customer, make leakage current or resistance measurements to determinethat exposed parts are acceptably insulated from supply circ

4、uit.CONTENTSDESCRIPTIONPAGESPECIFICATIONS. 4 - 5REAR PANEL / FRONT PANEL VIEW . 6DISASSEMBLY INSTRUCTIONS . 7WIRING DIAGRAM. 8 - 10BLOCK DIAGRAM.11SPECIAL FUNCTION . 12DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING . 12ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT . 13PCB LAYOUT . 14 - 28SCHEMA

5、TIC DIAGRAM . 29 - 46IC BLOCK DIAGRAM . 47 - 55EXPLODED VIEW. 56EXPLODED VIEW PARTS LIST. 57 - 59ELECTRICAL PARTS LIST . 60 - 79PACKING DIAGRAM . 80VERSION HISTORY . 81Parts marked with the symbol are critical with regard to the risk of fire and electricshock.Replace only with parts recommended by t

6、he manufacturer.4SPECIFICATIONSPOWER AMPLIFIER SECTIONRated distortion(Rated power level into 8 ohms, THD 20 Hz-20 kHz FL/C/FR) 0.1 %(Rated power level into 8 ohms, THD 20 Hz-20 kHz SL/SR/BS) 0.1 %Input Sensitivity(ref. 8 ohms, 1 kHz)366 20 mVS/N Ratio(A-wtd, 1kHz, 1 W, 8 ohm, SL/SR/BL) - 75 dBFrequ

7、ency Response(20 Hz - 20 kHz)0 1.0 dBChannel Balance(1 dB to -40 dB, 1 kHz) 2 dB(-41 dB to -50 dB, 1 kHz) 3 dBAudio muting at 1 kHz 55 dBSubwoofer out, 500 mV in (THD at 2 V O/P, 100 Hz) 0.5 %Crosstalk(500 mV input, 10 W, 1 kHz) -57 dBControlsBass(at 500 mV in, 1 W out, 100 Hz) 10 dB 2 dBTreble(at 5

8、00 mV in, 1 W out, 10 kHz) 10 dB 2 dBDOLBY DIGITAL SECTIONChannel Difference(FL ref. Track 30) 1.2 dBFrequency Resporse at Dolby config.2SL Track 46 200 - 20 kHz 0.8 dBSR Track 47 200 - 20 kHz 0.8 dBC Track 44 200 - 20 kHz 0.8 dBHarmonic Distortion(1 W, Audio LPF, Dolby Congfig 1)FL Track 65 997 Hz

9、0.08 %FR Track 67 997 Hz 0.08 %SL Track 68 997 Hz 0.08 %SR Track 69 997 Hz 0.08 %C Track 66 997 Hz 0.08 %S/N Ratio(TRACK 30 for O/P 1 W, FAUSE)CCIR / ARM 65 dBAudio LPF 70 dBA-WTD 70 dBChannel Separation(1 W, A-WTD FILTER)Track 65 997 Hz 60 dBDOLBY PRO LOGIC II SECTIONFrequency ResporseI/P mode : L,

10、 R: 1 V in, 1 W, Ch L/R40 Hz0 2.0 dB20 kHz0 2.0 dBI/P mode : L=R: 1 V in, 1 W, Ch /L/R40 Hz0 2.0 dB Ch C20 kHz0 2.0 dBI/P mode : L=-R: 1 V in, 1 W, Ch SL/SR40 Hz0 2.0 dB20 kHz0 2.0 dBS/N Ratio (200 mV in, 1 W, A-WTD w/ 1 k termination)I/P mode : L, R: 1 kHz, Ch L/R 65 dBI/P mode : L=R: 1 kHz, Ch C 6

11、5 dBI/P mode : L=-R: 1 kHz, Ch SL/SR 65 dBTHD (2.2 V in, 1 W, w/ 80 kHz LPF, 1 kHz) 0.2 %5DTS SECTIONOutput Level (Vol 0 dB): FL/FR/C/SL/SRTrack 61 kHz0.3 1.3 WChannel Difference (FL ref): FL/FR/C/SL/SRTrack 61 kHz 1.0 dBHarmonic Distortion (Audio Filter) : FL/FR/C/SL/SRTrack 10-14 1 kHz 0.08 %Frequ

12、ency Response (20 Hz to 20 kHz)Track 26-30+2/-1.5Subwoofer Output Level1 kHz ref at pre-out (FL)Play Track 10, charge to 1512.5 1.5 dBAM TUNER SECTIONInput level is expressed as the reading in open circuitof 75-ohm source impedance signal generatorUsable sensitivity(999/1000 kHz) 30 dBuVS/N Ratio(5

13、mV in) 38 dBTHD(5 mV in) 3 %IF Rejection(450 kHz) 36 dBImage Rejection(F+2xIF) 28 dBSelectivity 17 dBOutput170 -20/+30 mVLoop sensitivity(20 dB S/N)999/1000 kHz 66 dB603/600 kHz 66 dB1404/1400 kHz 66 dBFrequency Response(100 - 2.3 kHz, 5 mV) 6 dBFM TUNER SECTION *C, *CT *AH, *AHTInput level is expre

14、ssed as the reading in open circuitof 75-ohm source impedance signal generatorUsable sensitivity(98 MHz) 15 dB 15 dB vS/N Ratio(60 dB, IHF wtd)Mono 63 dB 63 dBStereo 63 dB 63 dBFrequency Response(20 Hz - 15 kHz, 60 dB)0 1.5 dB0 1.5 dBChannel Separation(60 dB)100 Hz 30 dB 30 dB1 k 38 dB 38 dB10 kHz 3

15、0 dB 30 dBAlternate Channel Selectivity (40 dB, 400 kHz) 60 dB 45 dBCapture Ratio(40 dB) 3 dB 3 dBAM Suppression (60 dB, 100% Mod. FM, 30% Mod. AM) 48 dB 48 dBImage Rejection(119.4 MHz) 65 dBI.F. Rejection(10.7 MHz) 78 dB Pilot Suppression(98 MHz) 60 dB 60 dBTHD (60 dB, L=R 75 kHz for AH, 40 kHz Dev

16、 for C)Mono 0.25 % 0.25 %Stereo 0.35 % 0.35 %Auto-Search SensitivityOn 24 dB 24 dB Off 15 dB 15 dB RDS decode Sensitivity 26 dB PHYSICAL SPECIFICATIONSDimensions (Width x Height x Depth)435 x 170 x 423 mmNet Weight20.50 Kg (45.10 lbs)Shipping Weight24.0 Kg (52.80 lbs)61234567892110201119121314151617

17、18T 763 (AH) NORTH AMERICAT 763 (C) EUROPEAN VERSION25117151613101112193967841814FRONT PANELREAR PANEL / FRONT PANEL VIEWREAR PANEL1.FM & AM ANTENNA2.MAIN IN / AUDIO PRE-OUTS /SUBWOOFER OUT3.SOFT CLIPPING ON/OFF4.MONITOR OUT5.MS OUT (MULTISOURCE OUT)6.CD INPUT7.IR INPUT & OUTPUT8.12V TRIGGER INPUT &

18、 OUTPUT9.COMPONENT VIDEO IN &COMPONENT VIDEO OUT10.DIGITAL AUDIO INPUT &DIGITAL AUDIO OUTPUT11.RS-23212.POWER SWITCH13.SWITCHED AC OUTLETS14.AC POWER INLET15.SPEAKERS A & B16.DVD, SAT, VCR, VIDEO 4 & VIDEO 517.TAPE INPUT & OUTPUT18.DISC INPUT19.7.1 CH. INPUTS1.STANDBY SWITCH2.STANDBY LED3.AM / FM4.F

19、M MUTE / MODE5.DISPLAY6.MEMORY7.PRESET DOWN / UP8.SEARCH DOWN / UP9.VFL DISPLAY10.VOLUME (SETUP)11.VIDEO & AUDIO12.TAPE MONITOR13.DIGITAL AUDIO SELEC-TOR14.EXT. 7.115.SURROUND MODE16.LEVELS17.TONE CONTROLS18.TONE DEFEAT19.SPEAKERS A & B20.VIDEO 6 INPUT21.PHONES7DISASSEMBLY INSTRUCTIONS1.Remove machi

20、ne screws M4.0 x 8.0 (1 to 6) from the side panels.Remove tapping screw 3.0 x 8.0 (7 to 10) from the back panel.Refer to Figure No. 1.2.Pull both sides of the TOP COVER slightly outwards 11 and tilt approx. 35 and thenremove in the direction as indicated by the arrow 12. Refer to Figure No. 2.Figure

21、 No. 1Figure No. 28KEYBOARDMAIN BOARDTRIGGER BOARDPOWER SWITCHBOARDJ8101BJ713AJ714AJ715AJ719AJ720AJ717AJ710AJ711AJ712AJ707AJ704AJ502BJ709AJ713BJ714BJ203AJ204BJ901BJ753BVIDEO 6 INPUT BOARDJ758BJ757BJ709BDSP BOARDJ604BJ715BJ1009BJ1010BLED BOARDPSU BOARDCOMPONENT VIDEO BOARDDIGITAL BOARD AUDIO BOARDVID

22、EO BOARDSPEAKER A BOARDSPEAKER B BOARDJ1009AJ1010ARS232 BOARDTUNERPRE-OUT BOARDMULTI-CHANNEL BOARDJ717BJ611AJ612AJ6101BJ6101AJ719BJ6104AJ708BJ707BJ350AJ414BJ710BJ711BJ712BJ414AJ704BJ3103AS-VIDEO BOARDAMP 2 BOARD(SURROUND AMP.)AMP 1 BOARD(FRONT & CENTER)J612BJ502AJ503AM506J511AJ581AJ781BJ503BJ611BJ80

23、1AJ901AJ753AJ754BJ751BJ504AJ501AJ757J756J761_NJ761_LJ760J758J759J203BJ3103BJ6102BJ6103BJ6102AJ6103AJ201J204AJ6106AJ6105AJ350BJ6106AJ6105AJ504B1J504B2J582B1J582B3J582B5J501B1J501B2J501B3J701J782B1J782B2J782B3P4401ISC BOARDJ782A1J801BJ802BJ784AJ783A1J511BJ811BJ803BSECONDARY BOARDJ802AJ801AJ581AJ781AJ7

24、82AJ582AJ803A2J803A1J811AJ504B3J801B1J801B2J801B3J801B4J801B5J788BJ788AJ786BJ786AJ207BJ512AJ207BJ512BTO MAIN BOARDTO MAIN BOARDTO MAIN BOARDTO MAIN BOARDTO MAIN BOARDFROM TRANSFORMERUL VERSION : USE J758, J759CE VERSION : USE J760MOUNT ONCHASSIS GND363738393540414234163332302927282625201918171514131

25、211910218765321234342224314544THERM SENSNORWIRING DIAGRAM9WIRING DIAGRAM PARTS LIST1276-022630-00CABLE ASSY 2 WAYS AWG26 2.5P L=480mmAMP1 BD-J511A2276-041823-05CABLE ASSY 4 WAYS AWG=18 3.96P UL1007AMP1 BD-L=280mmJ581A3276-062613-22CABLE ASSY 6 WAYS AWG=26 2.5P UL1007AMP1 BD-L=320mm (RoHS)J503A4276-0

26、22613-05CABLE ASSY 2 WAYS AWG=26 2.5P UL2468AMP2 BD-L=340mmJ811A5276-041823-02CABLE ASSY 4 WAYS AWG=18 3.96P UL1007AMP2 BD-L=200mm REV.B (RoHS)J781B6276-042613-08CABLE ASSY 4 WAYS AWG26 2.5P UL1533AUDIO BD-L=450MM (ROHS)J3103A7276-022613-07CABLE ASSY 2 WAYS AWG=26 2.5P UL1533DIGIT BD-L=540mm (ROHS)J

27、1009A8276-042613-06CABLE ASSY 4 WAYS AWG=26 2.5P UL2468DIGITAL BD-L=540mmJ1010A9276-011843-01CABLE ASSY 1 WAY AWG18 UL1007 BLACKKEYBOARD-L=100mm W/ RING TERMINAL (RoHS)J20110276-052613-08CABLE ASSY 5 WAYS AWG26 2.5P UL1007LED BD-L=160mm (RoHS)J204A11276-011800-00CABLE ASSY 1 WAY AWG18 UL1007 BLACKMA

28、IN BD-L=250mm W/ RING TERMINALJ70112276-032613-18CABLE ASSY 3 WAYS AWG=26 2.5P L=110mmMAIN BD-J6106B13276-032613-19CABLE ASSY 3 WAYS AWG=26 2.5P L=60mmMAIN BD-J6105B14276-032613-29CABLE ASSY 3 WAYS AWG26X2C UL2547MAIN BD-L=210mm (UL LABEL) (RoHS)J715A15276-082613-22CABLE ASSY 8 WAYS AWG=26X3C L=480m

29、mMAIN BD-(RoHS)J709A16276-102613-14CABLE ASSY 10 WAYS AWG26 2.5P UL1007MA BD-L=460mm (UL LABEL)J350B17276-122613-16CABLE ASSY 12 WAYS AWG26 2.5P UL2468MA BD-L=230mm (UL LABEL) (RoHS)J502B18276-142613-02CABLE ASSY 14 WAYS #26 2.5P UL1007MA BD-L=540mm (RoHS)J8101B19276-031823-09CABLE ASSY 3 WAYS AWG=1

30、8 3.96P UL1015SPK BD-L=320mmJ782B1,J782B2,J782B320276-031823-11CABLE ASSY 3 WAYS AWG=18 3.96P UL1015SPK BD-L=350mmJ582B1,J582B2,J582B321276-051840-00CABLE ASSY 5 WAYS AWG18 3.96P UL1007SPK BD-L=270mm (V/BL/Y)J801B1-B522276-051823-09CABLE ASSY 5 WAYS AWG=18 3.96P UL1007SPK BD-L=120mm (BR/R/O)J501B1,J

31、501B2,J501B323276-031823-16CABLE ASSY 3 WAYS AWG=18 3.96P UL1015SPK BD-L=240mm REV.CJ504B1,J504B2,J504B324235-018513-01STRANDED WIRE AWG=18 L=130mm BLACKSPK BD-TIN LEAD UL1007J786A,J788A25276-062613-05CABEL ASSY 6 WAYS AWG=26 2.5PPO BD-J612AUL1533X1C L=350mm (RoHS)ItemDatabase Part NumberDescription

32、Remark10ItemDatabase Part NumberDescriptionRemark26276-062613-10CABLE ASSY 6 WAYS AWG=26 2.5P UL1533PO BD-J611AL=700MM (RoHS)27276-011643-29CABLE ASSY 1 WAY AWG=16 UL1672PS BD-J756BROWN L=100mm28276-011643-69CABLE ASSY 1 WAY AWG=16 UL1672 BLUEPS BD-J757L=100mm29276-042613-07CABLE ASSY 4 WAYS AWG26 2

33、.5P UL2468PS BD-J753AL=400mm (ROHS)30276-041823-07CABLE ASSY 4 WAYS AWG=18 UL1672SE BD-J802AL=150mm31276-041823-12CABLE ASSY 4 WAYS AWG=18 3.96P UL1007SE BD-L=170mm YB03083002J803A1,J803A232276-081823-03CABLE ASSY 8 WAYS AWG=18 3.96P UL1672SE BD-J801AL=150mm33276-082613-28CABLE ASSY 8 WAYS AWG=26 2.

34、5PSV BD-J414ASHIELDED L=480mm (UL LABEL) (RoHS)34276-011843-01CABLE ASSY 1 WAY AWG18 UL1007 BLACKV6 BD-P4401L=100mm W/ RING TERMINAL (RoHS)35238-030070-20FFC CABLE 30 PINS P1.25 L=70mmJ601CW/SHIELD36238-172820-03FFC CABLE 17 PINS P1.25 L=200mmJ720CW/ SHIELD37238-200016-00FFC CABLE 20 PINS P1.25 L=16

35、0mmJ604CW/ SHIELD38238-280017-00FFC CABLE 28 PINS P1.25 L=170mmJ6102C,W/ SHIELDJ6103C39238-300222-00FFC CABLE 30 PINS P1.25 L=220mmJ713C,W/ SHIELDJ714C40276-011643-23CABLE ASSY 1 WAY AWG=16 UL 10151-CHASSISGREEN/YELLOW L=100mm (RoHS) GND41276-011643-29CABLE ASSY 1 WAY AWG=16 UL16721-INLET/BROWN L=10

36、0mmPSU.BD (L),J761_L42276-011643-69CABLE ASSY 1 WAY AWG=16 UL1672 BLUE1-INLET/L=100mmPSU.BD,J761_N43276-042613-10CABLE ASSY 4 WAYS AWG=26 2.5P UL2877RS BD-J901AL=430mm (RoHS)44276-022613-18CABLE ASSY 2 WAYS P2.5 AWG26 UL2877CV BD-J512AL=280mm45276-062613-25CABLE ASSY 6 WAYS AWG26 2.5P UL1007CV BD-J2

37、07BL=380mm (RoHS)11BLOCK DIAGRAM12SPECIAL FUNCTIONFEATUREA AKEYS PRESS ON FRONT PANELRESET FOR AH VERSIONVIDEO + TONE DEFEATRESET FOR C VERSIONVIDEO + TONE CONTROLSNTSC / PAL SELECTIONVIDEO + MEMORYVFD ALL DISPLAYAUDIO + TAPE MONITORAM FREQ. STEPAM/FM + FM MUTECOLOUR BAR GENERATORAUDIO + DIGITAL AUD

38、IO(VC-version units only)(all monitor outputs will show the generated colour bar)DETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGINGT89C51RD2 (U202) main clock is at 20MHz (X202)T89C51RD2 (U201) main clock is at 20MHz (X201)UPPER - +5V supply to KEYBOARD when power upLOWER - RESET line (TCM810LENB713) wh

39、enpower upUPPER - OUTPUT ENABLE (pin 24) of EPROM(W27C02) when changing SURROUND MODESLOWER - CHIP ENABLE (pin 22) of EPROM(W27C02) when changing SURROUND MODESSCLK (pin 43 of CS49326)LRCLK (pin 42 of CS49326)MCLK (pin 30 of CS49326)NOTE: The waveforms are based on software version V2.13V.13R522R545

40、R571P501P502P503R881R834P803P802P801R835R836R897AMPLIFIER ADJUSTMENTIdle Current1.Rotate R522 fully clockwise.2.Connect DC millivoltmeter to P501 (i.e. Across half of R523, 0.22 Ohm resistor).3.Turn on the unit.4.Adjust R522 for 1mV reading on voltmeter.5.Leave power on for at least 5 min, and check

41、 for idle current again.6.Repeat for other channels.CHANNELJUMPERVRFLP501R522FRP502R545CP503R571SLP801R835SRP802R836BSP803R897ISC Sensitivity1.Connect 8 ohm loading to all channels.2.Rotate R881 fully clockwise.3.Load all channels at full power using 1kHz sine wave.4.At this time, monitor the THD of

42、 the SL,SR,BS output. Clipping should occur before full powerachieved.5.Rotate R834 counter-clockwise slowly until the THD just below 0.1%.6.Repeat step 2-5 for R834 but monitor FL, FR & Center output.7.The procedure is finish at this step.8.Load all channels at full power using 1kHz sine wave with

43、4 ohm load.9.The clipping power(at THD 0.1%) should less than 85W.ADJUSTMENT POINT DIAGRAMFRONT/CENTER AMPLIFIER BOARDSURROUND AMPLIFIER BOARDISC BOARD14PCB LAYOUTAUDIO BOARDCOMPOSITE VIDEO BOARD15aCOMPONENT VIDEO BOARD - COMPONENT SIDECOMPONENT VIDEO BOARD - COPPER SIDE15bCOMPONENT VIDEO BOARD revi

44、sion 3 - COMPONENT SIDECOMPONENT VIDEO BOARD revision 3 - COPPER SIDE16DIGITAL BOARD - COMPONENT SIDEDIGITAL BOARD - COPPER SIDE17DSP BOARD - COPPER SIDEDSP BOARD - COMPONENT SIDE18FRONT/CENTER AMPLIFIER BOARD - COMPONENT SIDE19FRONT/CENTER AMPLIFIER BOARD - COPPER SIDE20SURROUND AMPLIFIER BOARD - C

45、OMPONENT SIDE21SURROUND AMPLIFIER BOARD - COPPER SIDE22KEY BOARD / LED BOARD- COMPONENT SIDEKEY BOARD / LED BOARD- COPPER SIDE23MAIN BOARD24MULTI-CHANNEL BOARD - COMPONENT SIDEMULTI-CHANNEL BOARD - COPPER SIDE25POWER SUPPLY (STANDBY)ISC BOARD- COMPONENT SIDEISC BOARD- COPPER SIDE26PRE-OUT BOARD - CO

46、PPER SIDEPRE-OUT BOARD - COMPONENT SIDERS-232 BOARD- COPPER SIDE- COMPONENT SIDE27SPEAKER TERMINAL BOARDPOWER SWITCH / TRIGGER BOARDVIDEO 6 BOARDSECONDARY BOARD28S-VIDEO BOARD29SCHEMATIC DIAGRAMAUDIO SWITCHRESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM.NOTE:1. RESISTORS, UNLESS OTHERWISE SPE

47、CIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.30COMPONENT VIDEONOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5% CARBON FILM.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.3. SOME COMPONENTS & FEATURES MAY NOT BE AVAILABLE:A)

48、INPUT FILTER TO TV5146B) SIGNAL 5146_VMUTE (previously named RGB_MUTE), WHICH EXTENDS THE MUTE SIGNAL TO BOTH THE S-VIDEO AND CVBS CIRCUITS L4507 is mounted to the power x-former suport bracketAdd 12V 1W Zener for AC MAINS 230V31E C B2SA933DTC144ESAE C BDTA144ESAE C BCOMPOSITE VIDEORESISTORS : UNLES

49、S OTHERWISE SPECIFIED ARE CARBON FILM.NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.32ISCE C B2SA10152SC1815E C B2SA1016KRESISTORS : RN-CERMIC CASE, MO-METAL OXIDE, F-FUSIBLE UNLESS OTHERWISESPECIFIED ARE CARBON FILM.N

50、OTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.3. COMPONENTS MARKED ARE SAFETY CRITIAL PARTS.33POWER SUPPLY (SECONDARY)NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. COMPONENTS MARKED ARE SAFETY CRITIAL P