- 2 -
TUNER ADJUSTMENTS
Use a plastic screw driver for adjustments.
Adjust the intermediate frequency of AM to the frequency of ceramic filter.
Set of unit
Supply voltage
:
AC 230V
speaker impedance
:
4 ohms
standard output
:
50 mW
Function select:
:
TUNER
a. Parts Location
a.AM Adjustment
Band :AM
SG
Position of
VTVM
Input
Output
Frequency
Tuning dial
Oscilloscope
Closed the output
termial by sweep
generator,it place
to AM ANT
Connect AM SG to
522 KHz
515KHz
L2121
test loop
1611 KHz
1640KHz
Connect AM SG to
Connect VTVM to
603 KHz
600KHz
L2120
test loop
speaker terminals.
1404 KHz
1400KHz
C4
b.FM Adjustment
Band :FM
FM Dummy antenna: 75 ohms unbalance
SG
Position of
VTVM
Input
Output
Frequency
Tuning dial
Oscilloscope
FM ANT
87.00 MHz
87.00 MHz
L2102
Max.
109.00 MHz
109.00 MHz
Max.
FM ANT
90.00 MHz
90.00 MHz
106.00 MHz
106.00 MHz
3
2
3
Step
1
cover range
Adjusting
Circuit
2
1
Step
Adjustment
IF
T2301
Tuning
515KHz
450 KHz
Connections
Adjusting
Connection
Max.
Adjustment
Circuit
Tracking
Tracking
Max.
TP7(L)
TP9(R)
Tuning
cover range
IF
Max.
DIP
1
13
12
24
10
20
E
E
E
C4315
D4018
TA
CD
TU
CN409
J4226
J4124
J4122
J4121
J4225
J4123
+9V
+13V
MUTE
J4224
J4205
D4033
J4204
J4120
L2121
L2120
IC211
XF231
XF222
XF233
L2201
XF211
CN201
XF221
C2304
C1
C2
C4
C3
L2101
C2310
Q2401
C2208
C2209
C2210
C2102
C2403
C2205
J2104
J2102
J2101
C2311
J2306
C2901
D2901
J2303
L2102
C2202
C2203
C2307
J2201
J2106
T2301
J2105
C2303
J2103
Q2501
S2001
VC201
J2304
D2103
J2305
J2302
W2003
Q2201
C2212
C2214
C2213
FM OSC
FM
FM ST
AM
J2301
J2308
J2307
FM GND
1AD9B10C33600
W2001
W2002
R4317
R4312
R4309
R4310
Q4008
Q4009
R4901
R4507
R4508
C2109
R2402
R2401
R2403
C2401
R2406
C2404
R2408
C2308
R2102
R2101
R2304
C2204
R2302
C2402
R2501
C2201
R2202
R2902
R2901
R2405
C2206
C2207
R2207
R2204
R2205
R2206
R2407
R2203
C2105
R2303
C2305
C2302
C2309
C2107
C2103
C2104
C2306
R2201
R2503
R2502
R2504
C2502
C2902
C2101
C2501
C2211
R2103
R2209
R2208
R2212
R2211
Q2202
R2210
C2301
SG201
D2201
C2106
D2104
C2312
C2503
R2100
TP6
TP7
TP9
XF233
IC211
T2301 L2201
C2
L2101
L2120
C1
L2102
C4 L2121
C3
TP6(E)
Connect VTVM to
speaker terminals.
C3
Max.
Max.
Connect VTVM to
speaker terminals.
Connect VTVM to
speaker terminals.
IC211 Pin22(H)
TP6(E)
IC211 Pin19(H)
TP6(E)
107 MHz
87 MHz
L2201
XF233
C1
L2101
C2
This is a basic tuner adjustments.
