Alpine TDA7556R Service Manual page 5

(3) Control Settings
Power Switch
Fader Control
Balance Control
Treble/Bass Control ..........:.ccccsesseesesenees
Band Switch
Others
ON
Center Position
Center Position
Center Position
TDA-7556R/7659R/
TDA-7552R/7550R
(4) Adjustment Procedures
=| Description Connection | Signal Generator | Dial Control Test Point Adjustment
IF ; 98.1MHz, 72dB T.P.1
' H +
1 Adjustment Figure 2 (Mod. OFF) 98.1MHz TP2 AdjustL2101 to 0+ 15mvV.
Signal Meter OG: Iie 4e0B
2 g Figure 3 (Mod. 400Hz, 98.1MHz T.P.3 AdjustVR2101 to 3.5+0.1V.
Adjustment
Dev. 40kHz)
Adjust VR2104 for the waveform
changing to maximum output.
Figure : Waveform of T.P.5 output.
Seek Stop . 98.1MHz, 30dB T.P.4
3 | Adjustment Figure 4 | ""(Mod. OFF) | 98-1MHz TPS
' MAX.
Stop the adjust VR2104 at this time.
a
. é = Adjust VOLUME to obtain 2V
98.1MHz, 72dB P output. This value is OdB.
(1) | Figure5 | (Mod. 400Hz, | 98.1MHz_ | Output
Dev. 40kHz) j ;
4 _ | Noise Level @Pre Output ee pets oun
Adjustment oka :
A
98.1MHz, -19dB O
(2) | FigureS | (Mod. 400Hz, | 98.1MHz |Speaker Output _/ Adjust VR210S fo -25 4 SdB output
Dev. 40kHz) at SG level minimum.
I . @Pre Output
98.1MHz, 40dB Oag
Stereo Blend (Mod. 1kHz, Adjust VR2102 forLch and Rech
5 | Adjustment Figure 6 Dev. 36kHz, 98.1MHz | Speaker Output —_| output level difference to be
(Lch) Stereo, Lch 8+ 2cB.
Only) @Pre Output
aa
OA
Stereo 98.1MHz, 72dB Speak er Adjust VR2103 for Rch output to
Separation : (Mod. 1kHz, Dev. Output be minimum, and confirm Lch and
° Adjustment Figure 36kHz, Stereo, OS. ane oe Tee Reh outputlevel difference is more
(Lch) Lch Only) @ than 20dB.
Pre Output
98.1MHz, 40dB OAQ
Stereo Blend (Mod. 1kHz, Speaker Output A
7 | Adjustment Figureé | Dev.36kHz, | 98.1MHz piooeed Same adlusiment tier
step5.
(Rech) Stereo, Rch er.
| Only) re Output
OAL
Stereo 98.1 MHz, 72dB Speaker
Separation . (Mod. 1kHz, Dev. Proceed same adjustment under
8 2 Output P. ,
Adjustment ree 36kHz, Stereo, soe ie ee step 6 by alternating Lch and Rch.
(Reh) Rech Only) e@
Pre Output
rae | |
NOTE: ©): For TDA-7556R Model Only, @: For TDA-7659R Model Only, A: For TDA-7552R Model Only,
J: For TDA-7550R Model Only, Others : Common.
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