Philips_PM5519_维修电路原理图.pdf

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1、Colour TV pattern generator PM 5519 9452 055 19003 Service manual 9499 525 00711 870501 /4 Industrial Resistor 716 is paralleled by capacitor 598, OP68, 4822 122 31213; resistor 722 is altered to 8K25, see figure. - Diode 434 in the 1 kHz oscillator, unit 10 is paralled by capacitor 597, 1 N, 4822 1

2、22 31 175 see figure. - Some chapters CHECK AND ADJUSTMENT of the service manual are revised: 4.4.1. Sub-carrier amplitude Connect oscilloscope with 10 : 1 probe to TP 5, pin 11/U 1. Check the sub-carrier amplitude: 2.5 Vpp f0.5 V. If necessary readjust with 604 4.6.2. Residual RF carrier series L 0

3、 17 . onwards (new VHF/UHF modulator type) - select abt. 200 MHz in the VHF range - set attenuator RF AMPL to max. output level (10 mV). - select WHITE test pattern - connect spectrum analyzer* to RF OUT - adjust residual carrier with potmeter 606 of the VHF/UHF-modulator to 10 % . 12 % (20 dB . 18

4、dB), from the sync. tips to white bar. - set PM 5519 to abt. 623 MHz in the UHF-range channel 40. - select GREYSCALE test pattern and set the attenuator RF AMPL to abt. 1 mV. - connect CTV receiver to RF OUT - check that greyscale pattern is correct (modulation not overdriven). Otherwise readjust re

5、sidual carrier with potmeter 606. - check that te residual carrier is within 10 mV p p (synchronizing level) continuously 60dB AM negative (or positive, selectable by solder link); modulation w i l l take place on IF. This modulated signal is then mixed up on RF. Internal or external modulation sele

6、ctable by means of push-button for VCR (rear panel) DC, mean value 1.8 V BNC socket (front panel) AC 1 Vpp into a load of 75R (fixed position of VIDEO AMPL control) 0 - 1.5 Vp p, continuously adjustable, into a load of positive BNC connector (front panel) positive RadioFans.CN 收音机爱 好者资料库 1.2.4. Soun

7、d p a r t - Sound c a r r i e r Frequency Tolerance - Sound modulation I n t e r n a l signal - FM sweep - AM modulation depth External signal - Bandwidth - Preemphasis - Sound input Input impedance Max. permissible voltage - Sound s e l e c t o r 1.2.5. Sync. p a r t Line frequency - Tolerance - Li

8、ne sync. signal - Lines / f i e l d Field frequency - F i e l d sync. signal RRP (Receiver Recogni- t i o n Pulse) - Sync. outputs Output s i g n a l Output voltage Impedance Polarity Coupling Max. permissible ext. voltage 4.5; 5.5; 6.0; 6.5 MHz, selectable by solder links; on delivery, adjusted t o

9、 standard value 0.2% FM ( o r AM, selectable by solder l i n k ) 1 KHz s i n e wave (40+-5) kHz with 5.5 MHz; s l i g h t l y d i f f e r e n t with other c a r r i e r frequencies (30+-5) % 0.2 Vrms r e s u l t s i n the same modulation depth a s f o r l n t e r n a l signal 100 H z - 10 KHz 50 p s

10、 (can be interrupted) D I N connector ( r e a r panel) 0.5 M R c a r r i e r ON/OFF modulation ON/OFF modulation 1 kHz/external 15625 Hz o r 15734 Hz, adjusted t o standard value 0.05% according t o standards CCIR and R T M A 312,5 lines for f line = 15625Hz or 262,5 lines for f line = 15734 Hz 50Hz

11、 for f line =1 5 6 2 5 H z o r 60 Hz f o r f 15734 Hz l i n e according t o standards (with preequalizing and postequalizing pulses) V C R i d e n t i f i c a t i o n In the synchronous pulse, selectable with button on f r o n t panel 2 B N C connectors ( f r o n t panel) 1 ) C O M P - S Y N C 2) FR

12、AME 2 4 V 15 k R negative D C ( d i g i t a l l e v e l ) +5 V and -1 V RadioFans.CN 收音机爱 好者资料库 642296 1.2.6. Chroma p a r t Systems Subcarrier frequency PAL according t o TV systems I,G o r M; NTSC. (delivered according t o standards) 4.433 619 MHz f o r PAL G and I 3.582 056 MHZ f o r PAL N 3.575

13、611 M H z f o r PAL M 3 579 545 M H z f o r NTSC -6 o - Tolerance f5.10 (+5.+40 C) Burst - Burst phase according t o standards; contained i n a l l t e s t p a t t e r n s 0 135 and 225O f o r PAL, 180 for NTSC Amplitude burst and chroma amplitude adjustable i n steps - Attenuation 0%, 25%, 50%, 75%

14、 100% selected by seperate o r combined push-buttons 0 Tolerance of chroma angle 23 1.2.7. Power supply Mains voltage - Tolerance Mains frequency - Tolerance 110 V, 127 V, 220 V, 240 V externally switched-over +10% Power consumption 18 Watt 1.2.8. Environmental conditions For Service Manuals Contact

15、 MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd, Chinnor Oxon OX9 4QY Tel:- 01844-351694 Fax:- 01844-352554 Email: enquiriesmauritron.w.uk 0 Reference temperature + 2 3 C Nominal operating +5 t o +40 C temperature 0 Limits For storage and -40 t o +70 C transportation This generator conforms t o VDE 0

16、411, class I, protective e a r t h connection. 1.2.9. Dimensions (over a l l ) - - p Height Width Depth Weight 1.3. ACCESSORIES 140 mm 305 mm 300 mm approx. 4.5 kg Supplied with t h e instrument: P M 9538 Connection Cable BNC - TV connector, 75 Ohm Operating manual Optional : P M 9539 Connection Cab

17、le B N C - impedance transformer, 75 - 300 Ohm P M 9075 Connection Cable BNC - BNC 75 Ohm Service manual RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 Rad

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