STR-K740P/K840P is the tuner and the amplifier section in HT-DDW740/DDW840.
ICs
used: M61511FP, NJM56500, UPC2581, STK350-230, LC89056W, TORX141(Infrared
sensor), TC7WU04F, NJM4565N, AK4527, CXD9617R, 1561LV6416-15T, BR24C16,
MB90470(System control)
US
Model
Canadian Model
AEP Model
UK Model
E Model
AEP Model
UK Model
E Model
POWER
OUTPUT AND TOTAL HARMONIC DISTORTION:
With 8 ohm loads, both channels driven, from 40 – 20,000 Hz; rated 100 watts (STR-K840P only)/80 watts (STR-K740P only) per channel minimum RMS power, with no more than 0.09 % total harmonic distortion from 250 mill watts to rated output (Models of area code U only).
With 8 ohm loads, both channels driven, from 40 – 20,000 Hz; rated 100 watts (STR-K840P only)/80 watts (STR-K740P only) per channel minimum RMS power, with no more than 0.09 % total harmonic distortion from 250 mill watts to rated output (Models of area code U only).
Amplifier
section
POWER OUTPUT
Models of area code U, CA
Rated Power Output at Stereo Mode
(8 ohms 40 Hz – 20 kHz, THD 0.09 %)
STR-K840P: 100 W + 100 W
STR-K740P: 80 W + 80 W
Reference Power Output
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P: FRONT1):100 W/ch
CENTER1): 100 W
SURR1): 100 W/ch
STR-K740P: FRONT1): 80 W/ch
CENTER1): 80 W
SURR1): 80 W/ch
Models of area code U, CA
Rated Power Output at Stereo Mode
(8 ohms 40 Hz – 20 kHz, THD 0.09 %)
STR-K840P: 100 W + 100 W
STR-K740P: 80 W + 80 W
Reference Power Output
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P: FRONT1):100 W/ch
CENTER1): 100 W
SURR1): 100 W/ch
STR-K740P: FRONT1): 80 W/ch
CENTER1): 80 W
SURR1): 80 W/ch
Models
of area code CEL,CEK
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P: 100 W + 100 W2)
STR-K740P: 80 W + 80 W2)
Reference Power Output2)
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P: FRONT1): 100 W/ch
CENTER1): 100 W
SURR1): 100 W/ch
STR-K740P: FRONT1): 80 W/ch
CENTER1): 80 W
SURR1): 80 W/ch.
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P: 100 W + 100 W2)
STR-K740P: 80 W + 80 W2)
Reference Power Output2)
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P: FRONT1): 100 W/ch
CENTER1): 100 W
SURR1): 100 W/ch
STR-K740P: FRONT1): 80 W/ch
CENTER1): 80 W
SURR1): 80 W/ch.
Models
of area code AR, SP
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P:
90 + 90W
CENTER1):
120 W
SURR1): 120 W/ch
SURR1): 120 W/ch
Models of other area code
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P: 100 W + 100 W2)
STR-K740P: 80 W + 80 W2)
Reference Power Output2)
(8 ohms 1 kHz, THD 10 %)
STR-K840P: FRONT1): 120 W/ch
CENTER1): 120 W
SURR1): 120 W/ch
STR-K740P: FRONT1): 100 W/ch
CENTER1): 100 W
SURR1): 100 W/ch
Main board circuit diagram [Click on the circuit diagrams to magnify]
Digital board circuit diagram
Power & Standby circuit
Tuner reset
You can change the AM tuning scale to 9 KHz or 10 KHz. After tuning in any AM station turn off the receiver. Hold down the Preset tuning + and – ve together.
All preset stations will be erased when you change the tuning scale. To reset the scale to 10 kHz (or 9 kHz), repeat the procedure.
Factory preset mode
All preset contents are reset to the default setting:
While depressing the Video-1 and the 2CH buttons simultaneously, press the Power button to turn ON the main power.
The message FACTORY appears and switch OFF the set.
While depressing the Video-1 and the 2CH buttons simultaneously, press the Power button once more.
The message FACTORY appears and the present contents are reset to the default values.
AUTO BETICAL MODE
* This mode is installed in the Europe models only. When this mode is used, the receiver scans the broadcasts that can be received by
the tuner, and sets up the broadcasts. Be sure to start scanning after connecting the antenna.
Check that the antenna is connected.
Press the Power button to turn ON power, while pressing the Memory button.
The message AUTO-BETICAL SELECT appears and the receiver starts scanning.
