Onkyo TXDS 575 Service Bulletin 2
This is the 16 pages manual for Onkyo TXDS 575 Service Bulletin 2.
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Extracted text from Onkyo TXDS 575 Service Bulletin 2 (Ocr-read)
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2-1 N IS SH IN -C H O,N EY A GAW A-S H I,O SA KA 5 72-8 540,J A PA N Tech in ic al I n fo rm ati o nG ro up,S erv ic e D ep t. S ER VIC E B U LL E TIN N O : 000 05 M AN AG ER A kir a M ori G L Seiji I c h ik am i DESIG N M asa o ki Y okoch i 2000/0 7/0 5 2000/0 7/0 4 2000/0 5/1 5 M ODELS : T X -D S575 S U BJE C T : C han ge o f p arts 1 .M ic ro pro cesso r T his m odel is u se d th e m ic ro pro cesso r o f 3 ty pes. W hen r e p la ce t h e m ic ro pro cesso r Q 7001, r e fe r t o t h e r e m ark s b elo w . I te m D esc rip tio n P art N o. C onta in o f c h an ge R em ark s A ppli c atio n U se i te m 2 i n ste ad o f 1 . M D:1 -1 06 00 1 30 01-1 4 600 R efe r t o n ote b elo w . M P:5 001-6 9 00 M D:1 0601-1 3000 1 4601- M P:1 -5 000 6 9 01- Im pro vem en t o f n o is e w hen D OLB Y . 22241343 1 M PD 780208G F-0 45-3 B A U se s a m e I C . 2 M PD 780208G F-0 47-3 B A 22241398 E li m in atio n o f 2 n d P ll c ir c u it 2 2241419 M PD 780208G F-0 56-3 B A 3 Fro m O ct. 1 99 9 U se s a m e I C . N ote : W hen y o u c h ange th e m ic ro pro ce sso r fr o m 0 45-3 B A to 0 47-3 B A , r e m ove 2 nd P LL c ir c u it a nd c h an ge th e s e ttin g o f A /D ,D /A C onve rte r IC Q 8501.
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ONKYO USA CORPORATION200 Williams Drive - Ramsey NJ 07446 201-825-7950 Fax 201-825-8150 Title: TX-DS575 Date: 04/13/03 Classification: Service Tip Ref #: TXDS575MUTE Symptom: Receiver shuts down when source, Speakers are selected or volume is set to MIN. position. Solution: Defective components Referring to Page 41 and 42 of service manual find all location of muting transistors used. Anyone of the following transistors at location Q3383, 3483, 3186, 3187, 3188, 3684, 3683, 3583, 3283, 3183 may be leaky. In the exception of Q3187 and Q3188, the emitter voltage of the above-described components should not exhibit any DC volt presence in excess of 12mv to max 20mv while operating. Mute duration is governed by C3194. Muting control DC volt (+2.6) passes through Q3185. The base of all muting transistors is -12vdc when unit is operating normal. When in mute mode, muting transistors base voltage goes to approximate +2.6vdc. Q3184 pins 1,2,3,4,8,9,10,11 are expected to be DC free. If Any DC is noticed, Q3184 may be defective. Troubleshooting Steps and Procedure: Since the unit is likely to shut down if any one of the function switches or volume controls reach MIN, do the followings to keep the unit ON. 1) On the power amplifier PCB locate P601A. Then Short all the connector pins together. 2) Locate Front amplifier input connector P520A. Short all the connector pins together EXCEPT FIRST PIN, which is 24vdc carrier. This condition will allow the unit to stay ON allowing troubleshooting without unit shutting down. ** Do not forget to remove or clean short when service is complete.
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TXDS575 Compiled on 05/24/2000 This is a part of more technical information to follow. To help troubleshoot this model for audio related problem the following easy to follow method has been adapted. Problem: Audio Analog via any source goes in and no audio out. Unit is not in protection mode. 1. Assuming that you have signal present at the CD input, we will chase the signal as follows. When we do, we will consider all supply voltages are up and up. No ripple voltage is seen over the DC supply line. 2. Remove the DSP PCB and set it flat with the component side accessible. Check for signal at pin 2 and 6, of Q101 and Q102. Please note that the pin label of Q101 and Q102 is incorrect. Pin 1 and 7 are output of those same IC's. 3. Balanced output of Q101 and Q102 arrive at pin 29,30,31 and 32. 4. Check for Master clock at Pin 39 of Q8501. If NO… 5. Go and check Q114 pin 5 and 6 Xtal. If OK got to 6. If NO Q114 or X is not working. Replace Q114 and X103. 6. Check Pin 23 and 24 to see if MCKO2 and MCK01 are running. If YES … 7. Check for data out at pin 9 of Q8501. If YES … 8. Check for the data again at pin 8 of Q114. If YES… 9. Look for the data return at pin 20 and sample rate at pin 19. If NO Q114 is possibly defective. 10. Pin 19 through 23 of Q114 working no Audio. Check for data present at pin 22 of Q707. If OK… 11. Check for DC state at connector P7001A "AMUT". If high (>.400vdc) go back to DSP pin 30 of Q707. This point also should have a clock coming from Q702 pin 5. If NO… 12. Check for the ripple voltage level on this IC Q702 and condition of X701 oscillation level. No distortion allowed. If NO … check Q702 for defect or X701. Replace. 13. If pin 5 of Q702 is good, Check DC voltage of Q707 pin 8,9,10,11,14,15,16,17 (8bit line) to the memory IC Q710. They should all read equal and just about 3.4Vdc. Data on all pins should be identical. If not Q710 is defective with Q708 and Q709 on suspect list. It is also worth noting that before assuming Q710, Q708, Q709 is bad, check for broken or loose R7711 through R7718. 14. When normal the following DC voltages appear at the following pins. See chart. Input is DVD digital set for PCM output or a CD player can be used. Pin# 01 02 03 04 05 06 07 08 09 10 11 DC volt 3.3 0 0 0 3.3 0 0 3.3 3.3 3.3 3.3 Pin# 12 13 14 15 16 17 18 19 20 21 22 DC volt 3.3 0 3.3 3.3 3.3 3.3 4.8 3.3 4.9 3.3 .9 Pin# 23 24 25 26 27 28 29 30 31 32 33 DC volt 3.3 0 1.7 1.7 .9 1.7 1.7 1.7 0 2.8 2.2 Pin# 34 35 36 37 38 39 40 41 42 43 44 DC volt 3.4 0 4.8 3.3 3.3 1.1 1 1 1.7 1.7 1.7 Input Coax 1 Setting Digital Q114 pin reference as follows. X103 is off since input is digital. Pin 12 data is OK Q707 operating as PCM, digital input. Fig1