KRC-21SA/SG/SYA/SYG
KRC-266/S
3
● SYNTHESIZER UNIT (X16-149x-xx)
COMPONENTS DESCRIPTION
Ref.No.
Application/Functions Operation/Condition/Compatibility
IC1 LCD driver with key-matrix
Q1 Key-matrix permission SW Ready on key-matrix
● SYNTHESIZER UNIT (X14-685x-xx)
Ref.No.
Application/Functions Operation/Condition/Compatibility
IC1 System MI-COM. System control
IC2 E-VOL. & N.C. MPX Controls sound volume. Selects each source.
IC3 Mute logic 3-input NOR gate x 3
IC4 Power IC Amplifies power so that the speaker can drive audio signal.
IC5 Equalizer amplifier Equalizer amplifier for cassette tape sound
Q50 BACK-UP detection(Momentary
power down detection) SW While BACK-UP is added, a base becomes Hi, and Q50 is turned on.
Q51 BACK-UP 5V AVR While BACK-UP is added, AVR outputs +5V.
Q52 Q51 and Q52 is inverted Darlington connection.
Q53 P.ON 5V SW While a base becomes Lo, Q53 is turned on.
Q54 COM+B SW While Q54's base becomes Hi, Q55 is turned on.
Q55 Works during POWER ON mode.
Q56 COM+B AVR While Q57's base becomes Hi, Q56 is turned on.
Q57 Q56 and Q57 is inverted Darlington connection.
Q58 Illumination +B SW While Q58's base becomes Hi, Q59 is turned on.
Q59 Works during POWER ON mode with a panel attached to the set.
Q60 Illumination +B AVR While Q61's base becomes Hi, Q60 is turned on.
Q61 Q60 and Q61 is inverted Darlington connection.
Q150 Electric volume mute SW When BACK-UP detection SW or CHANGER RESET SW or MI-COM.'s mute
works, a base becomes Hi, and Q150 is turned on.
Q151 SVR discharge SW When POWER IC RESET is activated, a base becomes Hi, Q151 is turned on.
Q153 Pre-out mute driver When BACK-UP detection SW or CHANGER RESET SW or MI-COM.'s mute
works, a base becomes Lo, and Q153 is turned on.
Q200 FM +B SW Q201 is turned on when Q200's base becomes Hi.
Q201 Works during FM reception mode.
Q202 AM +B SW Q203 is turned on when Q202's base becomes Hi.
Q203 Works during AM reception mode.
Q260 Motor +B SW When Q260's base becomes Hi, Q261 is turned on. Works during TAPE mode.
Q261
Q301 Changer reset SW When a base becomes Lo, Q301 is turned on.
Q320 Panel 5V SW While a panel is attached to the set, a base becomes Lo, and Q320 is turned on.
Q350 P-CON. driver When Q353's base becomes Hi, Q350 is turned on.
Q351 P-CON. protection SW Works when P-CON is being short-circuited on GND.
Q352 P-CON. protection inhibit SW Inhibits protection SW function when P-CON works momentary.
Q353 P-CON. SW Q353 is turned on when a base becomes Hi. Works during POWER ON mode.
Q370 ANT-CON. SW Q370 is turned on when Q371's base becomes Hi.Works during TUNER mode.
Q371
Q450 Pre-out mute SW (R ch.) When BACK-UP detection SW or CHANGER RESET SW or MI-COM.'s mute
Q451 Pre-out mute SW (L ch.) works, a base becomes Hi, and Q450,451 are turned on.
