Kenwood KRC-225 Service Manual page 4

KRC-225/235/265/265S
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SYNTHESIZER UNIT(X14-6850-XX)
Ref.No. Component Name
DTC114YK or UN2214
Q260
or KRC107S
Q261 2SB1443
Q301 DTA144EK or UN2113 Changer reset SW
Q320 2SA1037K
Q350 2SB1277(Q,R)
Q351 2SA1037K
DTA124EK or UN2112 P-CON. protection
Q352
or KRA103S
DTC114YK or UN2214
Q353
or KRC107S
Q370 2SB1277(Q,R)
DTC114YK or UN2214 ANT-CON. SW
Q371
or KRC107S
Q450 DTC143TK or UN2216 Pre-out mute SW (R ch.)
Q451 DTC143TK or UN2216 Pre-out mute SW (L ch.)
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COMPONENT DESCRIPTION
Application/Function
Motor +B SW
Panel 5V SW
P-CON. driver
P-CON. protection SW
inhibit SW
P-CON. SW
Operation/Condition/Compatibility
When Q260's base becomes Hi, Q261 is turned on.
Works during TAPE mode.
When a base becomes Lo, Q301 is turned on.
While a panel is attached to the set, a base becomes Lo, and
Q320 is turned on.
When Q353's base becomes Hi, Q350 is turned on.
Works when P-CON is being short-circuited on GND.
Inhibits protection SW function when P-CON works momentary.
Q353 is turned on when a base becomes Hi. Works during
POWER ON mode.
Q370 is turned on when Q371's base becomes Hi.
Works during TUNER mode.
When BACK-UP detection SW or CHANGER RESET SW or
MI-COM.'s mute works, a base becomes Hi, and Q450,451
are turned on.