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some of the writing is a bit blur but the part in the schmatic was great and i have fixed the machine thanks
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Well.. I'd searched for this manual and although I found many copies online I was pleased to find your website with a well balanced pricing system and easy to search and follow links. That together with the very quick response time was just what I was looking for.. being a very impatient tech.. ;-) I had the service manual in front of me within a short time.
Bookmarked.. and you can bet I will always come here first for my service & user manuals..
best regards
Ed(Tony) Foley
G7WHK
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I will definitely be back for more information when I need it.
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The service manual when downloaded and printed out was clear and easy to read. I would have liked to have been able to enlarge some details, but this was not possible as the file permissions did not allow this. The service was very good. The time taken from placing my order to downloading the document was only a few minutes.
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The manual is useful for trouble shooting for an old instrument. It saved money,and let me enjoy DIY.
< TUNER SECTION >(HR,HT)
1. Clock Frequency Check Settings : � Test point : TP2 (CLK) Method : Set to AM 1602kHz and check that the test point is 2052kHz ± 45Hz. 2. AM VT Check Settings : � Test point : TP1(VT) Method : Set to AM 1602kHz and check that the test point is less than 8.0V. Then set to AM 531kHz and check that the test point is more than 0.6V. 3. AM Tracking Adjustment Settings : � Test point : TP6(Lch), TP7(Rch) � Adjustment location : L981(1/3) ........................................ 999kHz Method : Adjust L981 (1/3) so that the output becomes maximum.
< DECK SECTION >
1. Tape Speed Adjustment Settings : � Test tape : TTA�100 � Test point : SP�OUT 2V � Adjustment location : SFR1 Method : Play back the test tape and adjust SFR1 for 3000Hz ± 5Hz (FWD) and FWD PLAY speed ± 45Hz (REV).
2. Head Azimuth Adjustment Settings : � Test tape :
TTA�300
Method :
� Test point : SP�OUT 2V � Adjustment location : Head azimuth adjustment screw Play back the 8kHz signal of the test tape and adjust screw so that the output becomes maximum. Next, perform on each FWD PLAY and REV PLAY mode.
4. FM VT Check Settings : � Test point : TP1 (VT) Method : Set to FM 108.0MHz and check that the test point is less than 8.0V. Set to FM 87.5MHz and check that the test point is more than 0.5V. 5. FM Tracking Check Settings : � Test point : TP6(Lch), TP7(Rch) Method : Set to FM 98.0MHz and check that the test point is less than 9.0dBµV. 6. AM IF Adjustment Settings : � Test point : TP6(Lch), TP7(Rch) � Adjustment location : L772 ................................................ 450kHz Method : Adjust L772 so that the output becomes maximum. 7. DC Balance / Mono Distortion Adjustment Settings : � Test point : TP3, TP4 (DC Balance) TP6(Lch), TP7(Rch) (Distortion) � Adjustment location : L771 � Input level : 60dBµV Method : Set to FM 98.0MHz and adjust L771 so that the voltage between TP3 and TP4 becomes 0V ± 0.04V. Next, check that the distortion is less than 1.3%
3. PB Frequency Response Check Settings : � Test tape : TTA�320 � Test point : SP�OUT 2V Method : Play back the 315Hz and 10kHz signals of the test tape and check that the 10kHz signal with respect to that of the 315Hz signal is 0dB ± 3dB. 4. REC/PB Frequency Response Check Settings : � Test tape : TTA�602 � Test point : SP�OUT 2V Method : Input a �20VU signal to the AUX terminal. Record the 1kHz and 10kHz signals on the test tape and play back them. Check that the difference between the record level and the play back level at 1kHz and 10kHz signal is 0dB to ± 3dB.
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