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Help: Service Manual Philips receiver FR951

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Ben52

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fr951

I'm searching now for several months for the service documentation of my receiver. I would like to repair him but for me that is impossible without having a good document as a gide line. I hope someone can help me.
Philips receiver FR951 or typenumber 70FR95117S

Thanks
 

philips/fr951/diagram

FR951 D 1997-09-18 749 1599 CBT No or weak sound from one front channel "One of the metal holders of the main PCB could be short-circuited.
The short-circuit is near J563 and the audio line is coming from J566
and this fault only occurs in the second version of the PCB.

Solution: Put a plastic washer between PCB and the metal holder J563.
" AUD-97-SLINK3
FR951 G 1995-05-08 719 1177 PWA Centre amplifier endstage might be blown up when output is measured. "CAUSE:

The endstage for the centre speaker is a two bridged endstage.
The minus connection is not protected!

SOLUTION
--------
Connect the measuring equipment (like Low Frequency generator and
Oscilloscope) via an isolating transformer and take care that
equipment is not interconnected via mass connections.
With this measuring methode there should not be any problem in
measuring the floating centre output stage.

REMARKS :
This publication will be followed by a service information.
" AUD-95-die00001
FR951 D 1995-05-10 683 1181 APA The volume of the rear speakers is insufficient. (too weak) "Interchange the centre amplifier and the surround amplifier.
Use the centre amplifier for the surround speaker, and the surround
amplifier for the centre speaker.

To do so, next actions on the P724 Surround and Centre amplifier board
have to be done:
* Reverse (turn 180 degrees) connector J901
* Reverse (turn 180 degrees) connector J903
* Cut coppertrack between minus connection of C928 and R948
(R948 must be connected with C904)
* Add wire between minus connection C928 en pin 1 of J901
(pin 1 of J901 will now be connected with R947 and R935)
* Change the values from R914 and R915 from 33k into 82k.

REMARKS :
In service information A95-450, which is in preparation now, more
detailed information like drawings will be published.
" AUD-95-JO05933
FR951 D 1995-09-18 691 1215 WIR High pitch sound is heard from the Loudspeaker. "The problem is due to pickup from the FTD display during low or no
input signal when the volume is in the high position.

The problem can be reduced by removing two ground wires W602 and W411.
W602 is mass connection of collector of Q754.
W411 is mass connection of Crystal X401" AUD-95-KC000026
FR951 A 1996-03-28 645 1336 REM Remote control does not activate the volume know at below 7°C. "Reason:
The supply voltage of the IR-eye is not clean, but has a ripple of
about 250 mV peak-to-peak during IR reception. This ripple is caused
by the blinking of the standby LED during IR reception because of
sharing of supply line.

Solution:
The problem is resolved by isolating the supply line by:
1. Cut PC board track between D404 and Q406
2. Add diode 1SS133T-77 (4822 130 33305)
3. Add wire (about 120mm) between junction D401/D402 to D404 positive.
" AUD-96-KC000001
FR951 D 1995-06-30 685 1204 APA Plopping sound in surround speakers when volume is turned up slowly "More specifically: when the set is already warmed up.

The fault is caused by the poor contact of the surround & center
amplifier printboard (P724) with the aluminum part.

Adding a mass wire from ground C917 , C923 (on surround & center
amplifier printboard P724 ) to the ground connection of J564, +C321,
-C322 (on mains printboard PV04)

REMARKS :
From 9518 onwards this wire has been implemented in production.
" AUD-95-JO06115
FR951 D 1998-02-10 756 1635 INP No sound, one channel, noise or no surround selection. "Cause:
Bad or no ground connection of the tuner and the digital selector.
(Ground via the backplate of the reciever).

Solution:
Apply extra ground connection to the ground of the set by adding a
wire to the ground of the surround amplifier or the heatsink.
" AUD-98-TR151130
FR951 S 1997-01-02 CDS Test CD Dolby Surround 4822 395 10216 "Test CD Dolby Surround 4822 395 10216
-------------------------------------
Dolby Surround sound is more and more included in todays Audio
equipment.
To measure specifications and to test Dolby Pro Logic equipment
and circuitry Philips developed a test CD for this purpose.
Below please find the composition of tracks together with a short
description of the application.

Track 1: Voice track to identify channels left, centre, right and
surround to check speaker connections
Track 2: 1kHz tone for electrical balance setting L/R,
Centre/Surround
Track 3..6: Test signals from 20Hz to 20kHz to measure frequency
response, harmonic distortion, signal-to-noise ratio and
channel separation for each channel.
Track 7..12: Test signals from 20Hz to 20kHz, max. 0dB CD level, to
check headroom for visible clipping for each channel.
Track 13: Unmodulated track during 30 sec. to measure S/N ratio
Track 14: Test signals from 100Hz to 7kHz to check the modified
Dolby B-type noise reduction decode characteristics in
Surround channel
Track 15.23: Test signals of 20Hz to 20kHz to enable distortion
measurements on all four channels at the same time
Track 24: Tone bursts of 1kHz during 1msec. to check the time delay
of the surround channel output
Track 25: Signal of 8.3 kHz to check time delay in surround channel
by means of Lisajous phase test
Track 26: Not correlated noise on all four channels to test
temperature behaviour of output amplifiers
Track 27: Pink noise repeated in sequence L->C->R->S->L->C, etc. to
simulate the noise sequencer in the decoder to enable the
user to match speaker levels for proper system balance
Track 28.34: Dolby Surround recorded music tracks to experience
Surround sound effect.

Dolby Pro Logic Test CD is available with service code 4822 395 10216.

REMARKS :
Service Information A96-450 (service code 4822 725 23980) describes
the various tests to perform to check and measure.
Dolby Pro Logic equipment by using above mentioned test CD.
A96-450 is an add-on to existing service manuals of Dolby Surround
equipment."
 
x401 service manual

Do you have any .pdf documents?
 
philips surround receiver fr-951

Hi All,
Has any of you ever managed to find this service Doc. for the Philips FR951?
Mine has an intermitendly disapearing RIGHT main channel.
This is specially anoying when watching a movie from DVD. all the sudden the sound is back and for a moment the whole flat can enjoy the return om my right channel, before I can turn it down.
Than after a wile, the sound is first starting to be reproduced destorted and than disapears again.
I've found a hint from someone to this site where a similar problem was reported by Sunny, but obviously I have a didfferent problem. When this channel gives's up, it is completely gone.
I can't believe that there is no-one left with this service doc.
I will take care of the copying and mailing expenses and than scan it all to a pdf, so that all can download a copy it when needed.
Please, stand up and help us.
Thanks, Joseph.
 

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