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Check line ranging from pins (31),(30) of
IC1701 (NICAM/GR), to the each input
terminal of IC2501.

Check PC 5V and  Hi-Fi 9V lines.

Is the supply voltage of PC 5V fed to pins(24),
(40) and 9V fed to pin (58) of IC651?

Is there audio signal inputted at each input
terminal as shown in table?

Tuner input terminal.

       IC2501  IC2501    

      pin(16)   pin(15)

Decoder signal input   
terminal.

Check line ranging from pins (39),(40) of
IC2501 (decoder circuit) or audio input
terminal to the each input
terminal of IC651.

Are there the serial data and clock at pins
(42) and (43) of IC651?

Check line between pins (42),(43) of IC651 
and pins (21),(27) of IC701?

Check line between pins (57)and (53) of 
IC651. 

Is there audio signal outputted at pin (57) 
of IC651?

Is there audio signal outputted at pins (5),
(53) of IC651?

Is there audio signal inputted at each input
terminal  of IC201 as shown in table?

U/V tuner audio input terminal.           pin(9)

Aux input terminal                           pin(8) 

Is there audio signal outputted at pins (11),
of IC201?

Is there audio signal outputted at pin (62)
of IC651?

Check line ranging from A-out pin (21),of 
TU101.

Check line ranging from pin (61) of IC651.

Line output terminal : Is there audio signal outputted at pins (59) and (53) of IC651?
RF output terminal : Is there audio signal outputted at pin(59) of IC651?

Replace  IC201.

Is there "L" level at pin(99) of IC201?.

Check line between pin (36) of IC651 and
pin(81) of IC701.

Check line between pin (11) of IC201 and
pin (62) of IC651

Is there "L" level at pin(8) of IC651?.

Check line between pin (8) of IC651 and
pin (21) of IC701

Replace  IC651.

Line output terminal 
Check line ranging from pins (59) and (53) of IC651 to pins (2) and (1) of IC2501.

RF output terminal 
Check line ranging from pin (59)  of IC651 to the audio input terminal of tuner TU101.

       IC651  IC651    

      pin(14)   pin(9)

Replace IC651.

Is there a REC FM signal outputted 
at the IC651 pins(29) to (24) (CH-1) 
/pins (21) to (22)(CH-2).

Check PC 5V lines.

Check  the AGC setting resistor R678 
and pin (39) of IC651.

Check peripheral circuit of IC651 as
shown in table.

L-ch pins (16),(17),(18),(19)

R-ch pins (32),(33),(34),(35)

Check AH-MZ harness.

Check or replace the cylinder.

Is the supply voltage of 5V fed to pin 
(25) of IC651?

Is there "L" level at pin (36) of IC651?

Replace IC651.

Is there playback envelope signal out
putted at pins(29) to (30) of IC651?

Check PC 5V lines.

Is there A-H.SW.P. signal at 
pin (27) of IC651?

Check peripheral circuit of IC651 as
shown in table.

L-ch pins (16),(17),(18),(19)

R-ch pins (32),(33),(34),(35)

Is the supply voltage of 5V fed to pin 
(25) of IC651?

Check the A-H.SW.P. line between pin 
(27) of IC651 and pin (28) of IC701.

Check the AUDIO MUTE (H) line 
between pin (99) of IC201 and pin 
(81) of IC701.

Is there signal at pin (4) of IC201?

Replace IC201.

Is  the supply voltage of 12V fed to
pin (2) of T601?

Check M 12V line.

Is there signal (Bias) at pin (5) of T601?

Check the Bias oscillation circuit (T601,
Q602,Q603) and A-ERASE CTL line.

Is "L" level applied at pin(99) of 
IC201?

Check peripheral circuits of T601.

Check the MH-AA harness and A/C
head.

Is there signal (Bias + Audio sig)
 at pin (6) of T601?

Is there signal at pin (100) of IC201?.

Are there MH-AA

 harness and the PB 

AMP

peripheral parts normal?

Is the azimuth height of 

A/C head properly

adjusted?

Check the 

AUDIO MUTE (H) line between 

pin (99) of IC201 and pin (81) of IC701.

Is there "L" level at pin (99) of IC201.

Is there signal at pin (1

1) of IC201.

Replace IC201.

Clean A/C 

head.

Replace A/C 

head.

Replace IC201.

Re-adjust azimuth.

Are there signal at pin(1) of 

IC601?

Is there audio signal inputted at 

and pin(62) of IC651.

Check line between pin(1

1) of IC201 

and pin(62) of IC651.

IC1701?

Check peripheral circuit of X1701.

Check peripheral circuit of 

TU101.

Check between SIF OUT

 of 

TU101 

and pin(2) of IC1701.

Check between IIC Data 

pins(26),(27) of IC701 and 

pins(12),(13) of IC1701.

Is there a base band signal at SIF 

OUT

 of 

TU101?

Is there a NICAM/IGR audio signal 

at pins(31), (30) of IC1701?

Is there a NICAM/IGR audio signal 

at pin(15),(16) of IC2501?

Is there a base band signal at 

pin(2) of IC1701?

Check line between pin(39), (40) of

IC2501 and pins(9), (14) of IC651.

See Flow Chart No.21 Hi-Fi SOUND 

MODE TROUBLESHOOTING 

(1)

For Hi-Fi model

Is 5V supplied at pins(1

1),(19),(1) of 

Check PC 5V line.

Is  MPX 8V supplied at pin(33) of IC1701?

Check the REG. circuit of D962.

Check PC Motor 12V line.

Check peripheral circuit of IC1701.

Replace IC1701.

Check serial data and clock at 

pin(12) and (13) of IC1701.

Is there oscillated 18.432MHz at 

pins(5), (6) of IC1701?