Grundig RRCD 2420 MP 3 Service Manual

Page 1

Service Document
Exchange SeI

RRCD 2420 MP3

Service A

Manual
Skherlieil
Safeiy

Mun/Pm Na. A
720108000001

Es gallon clia Vorsclurilien and Sicherlieiisliinwaise
Mae." Service Manual "Sidiecheii",MaieriaI-
nummer 720100000001,sowiemsétrJidi die even-
mell ubweiclienden, landeupezifischen Vamhrif
Ien!

me regulations and saleiy insnuciions shall be
valid as pfmided by the "Saleiy" Service Manual,
pan numbe! 720108000001, as well as Ilia
respedive naiianal deviaiions.

Dims Service Dokumeni isi nur in Davenfann verfijdoar
This Service Document is only available as data

Andaungan vorbeliullen/Subied to aliemiion
Mind: by GRUNDlG in Gsfmany I H541 0305

http://wwwgrundignom

GRUI'IDIG

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ALIGNMENT PROCEDURE

INSTRUMENTS REOUIRED GENERAL PREPARATION

l. Signal Generator 1. Check Source voltage. DC or Ac according to speciticalons

2. FM Signal Generator 2. Settunctlon switch to band being aligned

a. FM/AM IF Sweep Generator (Io.7 Ml-lz lor FM) 3. Signal input should be kept as low as possible to avoid AGc and AFC lunctlon

4. VTVM 4. Standard modulation : AM I KHz 30% mod

5. Oscilloscope FM l KHz 22.5 KHz dell
6. Frequency counter

7. Regulated DC powersupply

AM IF ALIGNMENT

SIGNAL S0uRCE AM RF Gen.) SET SIGNAL ALIGNMENT INDICATOR Oscilloscope. VTVM) SET RADIO
STEP CONNEC To To CONNECLTO DIALTO ADJUST ADJUST FOR REMARKS
TF3
A standard radiation AsoKHz Detector output terminal Quiet Volume control at
1 loop and ground (TP4) Point T601 Maximum min. position
2 Repeal step 1 tor max. output

FM IF ALIGNMENT
This model requires no FM IF alignment as the lF is Iixed by ceramic Iilter and discriminator CF502 or CFSOB 8t CFSDS. Please take note that correct type and same color dot OI ceramic Iilter is used
in Servicing, dlfl color dot OI ceramic Iilter may cause worse IF 8 Curve characteristic and distortion.

Connect IF genescope output terminal to TP3 at TP4 (GND) in series with a l000Pl capacitor, connect scope input terminal to TPI a TP2 (GND), then the IF characteristic curve can be observed.

FM FIF ALIGNMENT

SIGNAL SOURCE (FM Signal Gen.) SET SIGNAL ALIGNMENT INDICATOR (Oscilloscope. VTVM) SET RADIO
STEP CONNECT) To CONNECT) DIAL To ADJUST ADJUST FOR REMARKS
37.5 MHz 37.5 MHz NA NA Digital DC
l (modulated) (Lowest end) git meter is
L604 0 .C I rIneCted to
TPI a TP2 103 MHz Terminals loa MHz 59,3: arm) DC W 103) T? 5 and grg
2 through matching network (modulated) across speaker (Highest end) squeeze
il necessar voice coil Lsol RF coil
3 y 33 MHZ as MHz stretch or I _ Volume
(modulated) squeeze Maximum control at
I06 MHz TC .601 maX- Posmon
4 (modulated) 106 MHz (RF trimmer)

Repeat steps 0 and 4 as necessary to minimize tracking error and also steps I and 2 it necessary

AM HF ALIGNMENT

SIGNAL SOURCE (AM Signal Gen.) SET SIGNAL ALIGNMENT INDICATOR (Oscilloscope. VTVM) SET RADIO
STEP CONNECT) To CONNECT) Dunc ADJUST ADJUST FOR REMARKS
522 KHz 522 KHz Digital DC
1 (modulated) (Lowest end) NA NA Volt meter ls
I620 KHz lo20 KHz L605 Connected
2 A standard radiation (modulated) Across speaker (Highest end) (Osc.Coil) DC BV 10.3V TP 5 an 9'9
loop ant. 603 KHz voice coil L SOS, . Volume
3 (modulated) 603 KHz (ant. coil) Maximum control at
1404 KHz TC 603 max. pasmon
A (modulated) l404 KHz (ant. trimmer)
5 Repeat steps 0 and 4 as necessary to minimize tracking error and also steps I and 2 it necessary
ALIGNMENT PROCEDURE FOR CD SECTION
Applicable unit :
1 This model iS using CD drive unit NO. SANYO DAllBSV
2 The alignment for CD section iS fully automatic and no adjustment iS reguired
GENERAL PREPARATION - 1 I Check source voltage, DC or AC according to specilications . 2 ) Set Iunctlon switch to Tape being aligned .
A) MEASURING INSTRUMENTS REQUIRED FOR TAPE B) EOUIPMENTS REQUESTED FOR Ac BIAS FREQUENCVICURRENT ADJUSTMENT :
SPEED AND HEAD AZIMUTH ADJUSTMENT.
(1 )TAPE SPEED ADJUST
MTT-111 (3000 Hz) TEST WW
couuren rnsdusucv
couursn
g § 3000 E input 0 (fl) 0 ourpur o
CH 2 FIG.2 o C a 60KHz
E 41> d) I
R/F HEAD as
SPEAKER ~ FlG.l © a m .__ r
YERMlNALS m h T _O
o a» T0 CASS PCB
\ § § a CN401
0 Rb
MOTOR me Is nzoumso m em
all:
R/P mo
AleuTRADJscREw \ Ac BIAS FREDUENCV ALIGNMENT :

Note :The test unit should be keep in recording mode and added two resistors Ra & Rb as shown in the
Fig. 2 before alignment. be sure to delete the both resistors Ra & Rb alter alignment completed.

(2 ) HEAD AZIMUTH ADJUSTMENT. Test Point Adjust Frequency Frequency Observe at Observe

2.1 - Connect the equipments as shown in the Fig. 1. at Beat 0 Beat 1 Beat 2 Beat 0 Beat 1 Beat 2
(The Both Speakers loading Are Required) Resistor

2.2 - Inserta test tape ( 1D KHZ : M1T114 ) into deck. Ra of Rh L401 60KHZ : 0.3KHZ 54KHZi2KHz

2.3 - Press PLAY and set VOLUME at reference output.

2.4 - Adjust the azimuth adjustment screw tor the max.
& balance ch. output on both ch. ol Oscilloscope.

2.5 - Secure above screw with glue alter adj. completed.

GRunDIG RRCD 2420 MP3