Amp Adjustments - Yamaha CRX-E400 Service Manual

FACTORY PRESET
BAND MARKETS
U, C, R
FM (MHz)
A, B, G, R,
U, C, R
AM (kHz)
A, B, G, R
NOTE 1) PRESET PAGE ................................................. A : FM
CAUTION : When executing Test mode No. 2 RAM CLEAR, be sure to write down the preset memory contents of the
tuner, using a table like the one shown below. Execution of RAM CLEAR will set the memory contents of the
tuner back to the factory preset state which means that all the memories preset by the user will be erased.
Preset group
A
B
C
D
E

AMP ADJUSTMENTS

Confirmation of Idling Current
1) No signal applied.
2) Non-loaded condition.
3) Aging is not neccessary.
Test Point
Item
R319
MAIN L
(Between terminal)
R320
MAIN R
(Between terminal)
* Confirm that the idling current is 0.125mV — 7.5mV after 60 minutes.
Q261
Q262 R309
1
(100k/10k) 98.1
(50k/9k) 98.10
(100k/10k) 630
(50k/9k) 630
P1 P2 P3
Rating (DC)
If the measured voltage exceeds 2.5mV, cut the lead wire of R308(L ch)
or R309(R ch) and then check again if each measured value satisfies the
0.05mV—2.5mV
rating.
R319
R308
R320
PRESET No.
2 3 4
95.1 87.5 101.5 107.9
95.10 87.50 101.50 108.00
1080 1400 530 1710
1080 1404 531 1611
B : AM C : FM D : AM E : FM
P4 P5
Note
0.05mV ~ 2.5mV (DC)
R319 (L ch)
R320 (R ch)
Note)
•
If R308(L ch) or R309(R ch) have already been cut off and
idling current does not flow, reconnect R308(1kΩ) or
R309(1kΩ).
•
Q261 and Q262 are transistors for temperature correction.
Apply silicone grease to the contact surface with the heat
sink.
RX-E400
5 6 7 8
88.1 106.1 107.9
88.10 106.10 107.90
900 1350 1440
900 1350 1440
P6 P7 P8
R308 (L ch)
R309 (R ch)
Cut OFF
9