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Very fast and perfect delivery. Clear and well scanned. A lot of work professionally realized.
Again thak you a lot
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This manual is accurate and of high quality. It is only volume 2 of the service manual. This is schematic, parts lists, and exploded mechanical drawings. The theory of operation and the diss-assembly instructions are in volume 1. The unit can be tricky to dis-assemble portions of so the volume 1 manual can be important. The product description of the manual is accurate but it does not say anything about volume 1 and the image of the front page does clearly say Volume 2.
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Wellll again thank you very much fast and effective. Clear and well done for such an old TV!!!!
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It has all the information you will need to fix it. The main circuit diagram is only A4 but being a PDF, you can print it to any size - I did it on two sheets of A3 and it didnt lose any detail - just made it readable when pinned up above the bench. I've found the fault, just need to buy some obscure bits to get it going again!
I cant fault the process, I paid for the manual in the morning and it was ready to download by lunch time.
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Very good copy in a 54 pages PDF archive. This is my sixth purchase here. :)
NO.22 Hi-Fi TROUBLESHOOTING(2) (Hi-Fi Models) FLOW CHART NO.24 LINEAR SOUND MODE TROUBLESHOOTING (1)
VC-A310X/NZ VC-H725X VC-H730X/NZ
No linear sound recording (E-E mode is possible) No Hi-Fi sound recording(E-E mode is possible)
NO Check the AUDIO MUTE (H) line between pin
Is there "L" level at pin (99) of IC201? (99) IC201 and pin (81) of IC701.
NO Replace IC651. YES
Check peripheral circuit of IC651 as YES shown in table. Is there a signal at pin(4) of IC201? Replace IC201.
L-ch pins(16),(17),(18),(19)
R-ch pins(35),(34),(33),(32) NO
Is the supply voltage 12V fed to pin(2) of Check PC 12V line.
YES YES
YES T601? Check Hi-Fi 5V line.
NO
Is there signal (Bias) at pin (5) of T601? Q603) and FE BIAS CTL line.
of IC651?
NO Is there signal (Bias + Audio sig.) at pin (6)
YES of T601? NO Is the supply voltage of 5V fed to pin(25)
Check the Bias oscillation circuit(T601,Q602,
Is there REC FM signal outputted to the pins(21) (24)(ch-1)/pins(21) to (22)(ch-2)
of IC651 ? YES
YES Check peripheral circuits of T601.
Is there H level at pin(29) of IC651? Check AH-MZ harness.
YES
NO YES
Check the MH-AM harness and A/C head.
Check or replace the cylinder. Check the Hi-Fi CTL (H) line between pin (29) IC651and pin(22) of IC701.
FLOW CHART NO.25 LINEAR SOUND MODE TROUBLESHOOTING (2) YES No linear sound playback (E-E mode is possible) Check the record AGC setting resistor
R678 at pin(37) of IC651.
46
Is there a signal at pin(100) of IC201?
YES YES
Are MH-AA harness and the PB AMP. Replace IC651. NO peripheral parts normal?
FLOW CHART NO.23 Hi-Fi SOUND MODE TROUBLESHOOTING(3) (Hi-Fi Models) Clean A/C Head.
YES
No Hi-Fi sound playback(E-E mode is possible) NO Is the azimuth height of A/C head properly
adjusted?
Replace IC651. YES
YES Replace A/C head.
Readjust azimuth height. Is there playback envelope signal(about NO Is the supply voltage of 5V fed to pin(25) 300mVp-p) outputted to the pins(29),(30) of IC651? NO
of IC651? A-H.SW.P. signal pin(27) Is there "L" level at pin (99) of IC201? YES (99) IC201 and pin (81) of IC701. IC651?
NO
Check the AUDIO MUTE (H) line between pin
YES Check peripheral circuit of IC651 as shown in table. NO
L-ch pins(16),(17),(18),(19) Check the A-H.SW.P. line between pin
Is there a signal at pin(11) of IC201? Replace IC201.
NO
R-ch pins(35),(34),(33),(32) YES (27) IC651 and pin(28) of IC701.
YES Is there audio signal inputted at pin(62) Check line between pin (11) of IC201 and
Replace IC651. IC651? pin (62) of IC651.
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