JVC AV-20N3PX-PH Repair Manual

$7.99

JVC AV-20N3PX-PH - It's a complete service manual, and it's in PDF format. It contains circuit diagrams ( schemas ) etc. It also usually contains parts catalog. After placing order we'll send You download instructions on Your email address. See below for delivery information

The manual is available only in language(s): English

Link to manual will be sent on Your email address after You place order.

This product was added to our catalog on Monday 07 May, 2007.

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HIROSHI EMOTO - 11/29/2007

Very fast service and a good documents. Thank you.

Jacek Madej - 08/30/2008

Hi! love you!! schematics circuit best scan electronics area ...a have old radio grundig c8000 seek from net ... very done... hello best regard Edi from Poland

Henry Seiden - 02/26/2009

I downloaded this product and looked through it quickly with Adobe Reader v9. It is clean and a good copy. Some scanned pages are not perfectly square, but that is a minor complaint. The document schematics and board diagrams are easy to read, of good contrast. The whole file downloaded quickly. This is a good service! Sony charges about $100 for the printed version of the same manual. It is still available through their print-on-demand pro parts system, but why would you do that?

Dutra Lacerda - 02/17/2008

All schematics for the Euro-PC and some extra info. Needed if you want to replace some missing hardware. A piece of great historical value and for vintage computing entusiasts.

Nadia Yakunina - 06/19/2007

It was so difficult to find this manual on the internet - thanks a lot for making it so easy and simple. Incredibly handy. AND. It looks you make so many people happy for such small money. Good job!

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Click to see text excerpt from the manual

AV-20N3PX
Measuring
Description
Item Test point Adjustment part
instrument
Adjustment l TV audioL OUT7. LOW SEP.1. Input a stereo L signal (300Hz) from the TV audio multiplex
ofmultiplexR OUT8. HI SEP.signal generator to the Antenna terminal. (NTSC)
MTSsignal[AUDIO OUT]
2. Connect the oscilloscope to the L OUT terminal of the AUDIO
SEPARA-generator
OUT, and display one cycle portion of the 300Hz signal as
TION
shown in the figure.
l Oscillo-
3. Connect the oscilloscope to the R OUT terminal of the AUDIO
scope
OUT, and increase the voltage sensitivity of the oscilloscope.
4. Select the sub menu screen SOUND from the SERVICE
L-ChannelR-Channel
MENU.
(1 cycle)Crosstalk portion
5. Select 7. LOW SEP. with the MENU 1/4 key, and confirm its
initial setting value.
6. Adjust 7. LOW SEP. so that the peak-to-peak level of the 300Hz
signal becomes minimum, with the MENU 2/3 key.
Minimum
7. Change the input signal to 3kHz, and similarly adjust for 8. HI
SEP. by repeating steps 2 to 6.
n X-RAY PROTECTION CHECK
Measuring
Item Test point Adjustment partDescription
instrument
Check ofPins 1 and 3l Prepare the following resistor.
X-RAY 17.2kW ?1% 1/4W
PROTEC-[X Connector1. Turn on the power and receive any signal.
TIONon MAIN2. Connect the resistor between pins 1 and 3 of the X connector
PWB]on the Main PW Board.
3. Make sure that the picture disappears.
4. Unplug the AC power cord.
5. Disconnect the resistor from the X connector.
X-RAY PROTECTOR
6. Plug the AC power cord and make sure that the picture ap-
Apears normally.D562R562FR561 D561
TO HVT
X-Ray Protector Operation:
+
C561Normally the voltage at point "A" does not exceed the Zener volt-R563
age of D562. (The voltage at point "A" will be determined by divid-
ing the voltage from HVT (FBT) by R562 and R563.)
When you connect a resistor of 17.2kW or less in parallel with
MAIN PWB
R562, the voltage at point "A" is increased, D562 turns ON, and
3 2 1
the X-ray protection circuit is activated. Once it is activated, you
X
need to unplug the AC power cord to restore the X-ray protection
circuit.
17.2kW 1% 1/4W
No. 5604923