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Good pdf of the service manual for this unit. Includes disassembly instructions, full schematics, board layouts, parts lists and diagnostic information. Some information is in the pdf twice (single pages, and split pages), but that could be how it was originally generated by panasonic, or perhaps the idea is to make it eaiser to put onto 8.5 x 11" pages.
Information was exactly what I needed. Delivery was overnight (less than 12 hours) and I was happy with the process.
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5 STARS for FAST DELIVERY, BEST PRICES and QUALITY PRODUCT. Item was exactly as described with superb resolution. Will definitely source all my future requirements from this website. Thanks a lot owner-manual.com!
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OEM manual provided all schematics, board layouts and component specs necessary to facilitate unit maintenance. All pages were clear and readable.
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Good condition and quality. Hard to find anywhere in Internet, only on this site.
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Exactly what I needed to be able to bring the amp back to life... will come back to this site the next time I need schematics.
NOTE ON BEFORE STARTING REPAIR
1. Forced discharge of electrolytic capacitor of power supply block
When repair is going to be attempted in the set that uses relay circuit in the power supply block, electric potential is kept charged across the electrolytic capacitors (C101, 102) even though AC power cord is removed. If repair is attempted in this condition, secondary defect can occur. In order to prevent the secondary trouble, perform the following measures before starting repair work.
Discharge procedure
1 Remove the AC power cord. 2 Connect a discharging resistor at an end of lead wire that has clips at both ends. Connect the other end of the lead wire to metal chassis. 3 Contact the other end of the discharging resistor to the positive (+) side (+VH) of C101. (For two seconds) 4 Contact the same end of the discharging resistor as step 3 to the negative (-) side (-VH) of C102 in the same way. (For two seconds) 5 Check that voltage across C101 and C102 has decreased to 1 V or less using a multimeter or an oscilloscope.
MAIN C.B D101
3
C101
C102
4
2
2
Select a discharging resistor referring to the following table. Charging voltage (V) (C101, 102) 25-48 49-140 Discharging resistor (�) 100 220 Rated power (W) 3 5 Parts number 87-A00-247-090 87-A00-232-090
Fig-1
Note: The reference numbers (C101, C102) of the electrolytic capacitors can change depending on the models. Be sure to check the reference numbers of the charging capacitors on schematic diagram before starting the discharging work.
2. Check items before exchanging the MICROCOMPUTER
Be sure to check the following items before exchanging the MICROCOMPUTER. Exchange the MICROCOMPUTER after confirming that the MICROCOMPUTER is surely defective.
2-1. Regarding the HOLD terminal of the MICROCOMPUTER
When the HOLD terminal (INPUT) of the MICROCOMPUTER is �H�, the MICROCOMPUTER is judged to be operating correctly. When this terminal is �L�, the main power cannot be turned on. Therefore, be sure to check the terminal voltage of the HOLD terminal before exchange. When the MICROCOMPUTER is not defective, the HOLD terminal can also go �L� when the POWER AMPLIFIER has any abnormalities that triggers the abnormality detection circuit on the MAIN C. B. that sets the HOLD terminal to �L�.
� Good or no good judgement of the MICROCOMPUTER
1 Turn on the AC main power. 2 Confirm that the main power is turned on and the HOLD terminal of the MICROCOMPUTER keeps the �H� level or not. 3 When the HOLD terminal is �L� level, the abnormality detection circuit is judged to be working correctly and the MICROCOMPUTER is judged to be good.
FRONT C.B
MAIN C.B In some models, it is PIN (. OVER LOAD DET DC DET AC DET Q110 HOLD SW POWER AMP POWER AMP POWER SUPPLY
MICROCOMPUTER
PIN101 CON601 1 2 1 2 *
HOLD (
*
PIN number is different depending upon microprocessor.
Fig-2-1
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