TechGuru87
New Member
Hi, I am nearing the end of a Realistic STA-2100D restore, I have rebuilt both amp boards, protect, relay, power supply boards, replaced large filter caps and done many other repairs as needed with all new LED's. It looks & sounds great the FM Stereo works great but absolutely no AM reception at all. I am not sure what the problem is? I have followed other members troubleshooting methods. Checked voltages at IC203 (HA1197) they seem ok based on posts here but the schematic I got from HiFi Engine gives no voltages for the tuner section. Instead I used the 2100 (non-D) service manual as a reference. I injected an 1khz signal into pin 12 of HA1197 and get audio output. I also tried the IR Remote test and no pulses in AM. I have thoroughly cleaned the Tuner section but still no AM. All I get is static and popping across the whole AM Dial. Could it be IC203? How can I be sure it needs to be replaced. Anyone have any other troubleshooting ideas? Thanks in advance...
Here are the voltage readings for HA1197 - in AM Mode
Pins (1) 5.09v, (2) 2.2v, (3) 10.15v, (4) 7.23v, (5) 10.15v, (6) 3.65v, (7) 1.3v, (8) 2.5v, (9) 7.5v, (10) GND, (11) 11.10v, (12) 0v, (13) 1.4v, (14) 0v, (15) 0v, (16) .9v
TR203 (C945) Voltages - in AM Mode
(E) .86v, (C) 6.88v, (B) 1.47v
I forgot to mention that there is no signal meter movement in AM mode
Also, I ordered a few HA1197's from eBay today...
Here are the voltage readings for HA1197 - in AM Mode
Pins (1) 5.09v, (2) 2.2v, (3) 10.15v, (4) 7.23v, (5) 10.15v, (6) 3.65v, (7) 1.3v, (8) 2.5v, (9) 7.5v, (10) GND, (11) 11.10v, (12) 0v, (13) 1.4v, (14) 0v, (15) 0v, (16) .9v
TR203 (C945) Voltages - in AM Mode
(E) .86v, (C) 6.88v, (B) 1.47v
I forgot to mention that there is no signal meter movement in AM mode
Also, I ordered a few HA1197's from eBay today...
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