Troubleshooting; Ccc Cee Cee Ceeaees - Kenwood KR-6600 Service Manual

CIRCUIT DESCRIPTIONS /TROUBLESHOOTING
Stabilized
power
supply
PROTECTION
TROUBLESHOOTING
tans cas
Check the func-
(Others: OK)
tion of S-meter
Check the func-
tion of S-meter
Check the func-
tion of T-meter
Check the foi-
lowing parts:
Qg3
Inter-station
noise heard
Output
(Others: OK)
Check the fol-
lowing Parts:
Qg4, 1Cg1
Inter-station
noise not
heard
Check the fol-
lowing parts:
Qd1
No AM recep-
tion
(Others: OK)
Check the fol-
lowing point
{ICg3 terminal
10: 12V d.c.}
Check the fol-
lowing parts:
ICg3
Check the fol-
lowing parts:
Qg5
Check the posi-
tion of TAPE
MONITOR
switch
Check the center
voltage of the
power amp (Cen-
ter voltage: OV)
Check the func-
tion of protec-
tion relay
No output
from both ch,
'on all modes
No output from
one side
Check the
power voltage
of each stages
Check the fol-
lowing parts:
1Ci1
Check the posi-
tion of BAL-
ANCE control
Check the fol-
lowing parts
ICi1, Qi1,2
Check the
power amp
AM TUNER
The exclusively designed IC HA1151 is adopted. In this
circuit, Qd1 is used for the prevention of shock noise
which occurs at time of switching on in AM setting.
1. Power SW ON (transient)
Ok4 > OFF
AM MUT terminal > + voltage
Qd1—> ON
2. Steady state after power SW ON
Qk4—7 ON
AM MUT terminal — -voltage
Qdi—> OFF
Check the FM
output of ICg2.
(IC's terminal
No. 6, 7)
Check the fol-
lowing parts:
Qd2~4
Check the fol-
lowing parts:
Qg1,2
Check the fol-
lowing parts:
ICg2
Check the fol-
lowing parts:
1Cg1
Check the pro-
tection circuit
(Qk2~4)
NG
1 i
4